JP2009047505A - Ultra-wideband radar system and signal processing method for wideband radar system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the accuracy of detection when detecting a distance to a target such as a mobile object by transmitting/receiving UWB radio waves in an ultra-wideband (UWB) radar system and a signal processing method, even when the target approaches. <P>SOLUTION: A UWB transmission pulse signal on the basis of a transmission clock is generated from a transmitting antenna section. The UWB pulse signal reflected by the target is received by a receiving antenna section to be divided into first and second reception pulse signals. A first reception clock having a lower frequency with respect to a transmission clock frequency by a minute rate and a second reception clock having a higher frequency with respect to it by a minute rate are generated. First and second detection/integration means for detecting and integrating each reception pulse signal by first and second gate pulses corresponding to each reception clock to generate each baseband signal. Each baseband signal is AD converted, and a second digital signal is time reversed by a time reversal means and is combined with a first digital signal to be subjected to waveform display. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radar apparatus, and in particular, an ultra-wideband radar apparatus and a broadband radar apparatus that transmit and receive an ultra-wide band (UWB) radio wave and detect the distance of a target (target) such as a moving object with high accuracy. The present invention relates to a signal processing method.

  2. Description of the Related Art An ultra-wideband (UWB) radar device that transmits and receives ultra-wideband radio waves and detects the position (distance, azimuth, height) of a moving object with high accuracy is known.

  The ultra-wideband (UWB) radar device is characterized by high-accuracy position evaluation with distance resolution. Ultra-wideband radio waves have the property of transmitting through non-metals (attenuation media) such as concrete and wood when the frequency includes a low band of several GHz or less. And application to various radars and sensors is being studied utilizing these two characteristics. For example, UWB radar (wall transmission radar, through wall radar), forest that detects the movement of unauthorized intruders in buildings and rooms through walls, utilizing the two features of distance resolution and attenuation medium permeability UWB radar (forest penetrating radar, foliage penetrating radar, fopen radar), which detects the movement of dangerous animals lurking in the forest, and the survivors buried under rubble and earth and sand UWB radar (survivor detection radar) to detect, UWB radar (security gate detection radar for detection of security gates) to detect whether intruders in facilities have hidden dangerous objects, installed inside the front of the car UWB radar that measures the distance from non-metal bumpers and front grills, cars that park in front, and parking walls with high accuracy Anti-collision radar) and the like have been studied.

  FIG. 18 is a diagram showing a configuration of a conventional ultra-wideband radar apparatus, which uses a known equivalent time sampling technique. In the figure, 50 is a synchronization control unit, 51 is a UWB pulse generation unit, 52 is a transmission antenna unit, 53 is a reception antenna unit, 54 is a UWB gate pulse generation unit, 55 is a detection unit, 56 is an integration unit, and 57 is baseband. A signal AD conversion unit, 58 is a waveform display unit, and 59 is a target (person or the like).

  FIG. 19 is a diagram showing an example of the operation waveform of each part according to the configuration of the conventional example. The operation of FIG. 18 will be described with reference to FIG. 19. The transmission clock signal is repeatedly transmitted from the synchronization control unit 50 to the UWB pulse generation unit 51. The UWB pulse generator 51 repeatedly generates a UWB transmission pulse signal as shown in FIG. 19A at the timing of the transmission clock signal transmitted from the synchronization controller 50. The UWB pulse transmission signal generated by the UWB pulse generation unit 51 is radiated from the transmission antenna unit 52 to the free space where the target object 59 exists.

  The reflected wave from the target object 59 is repeatedly received by the receiving antenna unit 53 and becomes a UWB received pulse signal as shown in FIG. The UWB gate pulse generator 54 generates the gate pulse signal shown in FIG. 19C at the timing of the reception clock signal transmitted from the synchronization controller 50. The UWB reception pulse signal received by the reception antenna unit 53 is detected by the detection unit 55 between the gate pulse signals generated by the UWB gate pulse generation unit 54 based on the reception clock from the synchronization control unit 50, and is shown in FIG. A received pulse detection signal as shown in (d) is generated and integrated by the integrating unit 56 to become a baseband signal as shown in (e) of FIG. The reception clock repetition period generated by the synchronization control unit 50 is shifted by several Hz from the repetition period (transmission clock period) of the UWB reception pulse signal received by the reception antenna unit 53, and is received at an extremely high repetition frequency. The signal is subjected to sampling / integration detection (equivalent time sampling) in the detection unit 55 and the integration unit 56 to become a time-extended baseband signal. The baseband signal subjected to sampling integration detection is subjected to analog-digital conversion (AD conversion) by the baseband signal AD conversion unit 57 to become a digital signal as shown in FIG. The digital signal converted by the baseband signal AD converter 57 is displayed in a waveform display 58.

A motion sensor based on UWB (ultra-wideband) radar has been proposed (see Patent Document 1). In the motion sensor technology, a radar pulse repetition interval is generated from a self-running oscillator, two delay means are driven, one is a fixed reference delay means, and the other is a reception (gate pulse) path. The output of the fixed reference delay means drives an impulse generator that generates a transmission pulse, generates a pulse having a rapid rise time, and is directly radiated by the transmission antenna. The transmission pulse is reflected by the target, received by the receiving antenna, and input to the UWB detector. The output of the free-running oscillator delayed by the above-described adjustable delay means is converted into a pulse having a quick rise time by an impulse oscillator similar to that on the transmission side, and the received pulse is gated (strobe) to the UWB detector. And sample points in space corresponding to the bidirectional echo time to the target. The sampling output is averaged by an integrator, and the change in the output is detected by a differentiator, so that the presence of movement (for example, an intruder) can be detected.
Japanese Patent No. 3648236

  Originally, the equivalent time sampling method is a method that can sample at a high sampling rate without performing high-speed sampling for repetitive events (events in which the same received wave is always obtained), but in an ultra-wideband (UWB) radar, transmission is performed. Since the pulse transmission clock cycle is extremely short (the pulse repetition frequency is extremely high), it is possible to consider repetitive events at the speed of a walking person. Applicable. In this equivalent time sampling method, as shown in FIG. 19 (c), the received wave point (time) to be detected is slightly changed by shifting the period of the reception clock to be slightly longer than the period of the transmission clock. Since the delay time is gradually increased, the detection distance is gradually increased every reception clock cycle.

  FIG. 20 is an explanatory diagram of a moving target detection state according to the conventional equivalent time sampling reception method. As shown in FIG. 20A, the time (distance) of the received wave to be detected for each period of the received clock is shown. When the moving direction of the target object is the same as the direction (when the target object moves away from the UWB radar), the time (distance) point of the received wave to be detected with respect to the moving target object will pass. Therefore, it is possible to capture and detect a target object that moves reliably, but when the direction of movement of the target object is opposite to the time (distance) direction of the received wave that is detected at each reception clock cycle ( When the target object approaches the UWB radar), as shown in FIG. 20 (b), the time (distance) point of the received wave to be detected with respect to the moving target object will pass each other. Move May not be detected without can catch the target object that.

  Therefore, the conventional ultra-wideband radar apparatus of the equivalent time sampling reception method has a problem that the target object cannot be detected with high accuracy when the target object approaches the broadband radar apparatus.

  Further, the technique of Patent Document 1 is different from the equivalent time sampling, and the direction of the target movement cannot be identified.

  In the present invention, when detecting a target distance such as a moving object by transmitting / receiving an ultra-wideband (UWB) radio wave of an equivalent time sampling method, a wideband capable of improving the detection accuracy even when the target object approaches. It is an object to provide a signal processing method for a radar apparatus and a broadband radar apparatus.

  FIG. 1 is a diagram showing a principle configuration of the present invention. In the figure, 1 is a synchronization control means for generating a transmission clock signal and first and second reception clock signals, 2 is a UWB pulse generation means, 3a is a transmission antenna section, 3b is a reception antenna section, 4 is a power distribution means, Reference numeral 5-1 denotes first gate pulse generation means, 5-2 denotes second gate pulse generation means, 6-1 denotes first detection means, 6-2 denotes second detection means, and 7-1 denotes the first detection means. The first integrating means for integrating the first received pulse detection signal from the first detecting means 6-1 and the second integrating means 7-2 for integrating the second received pulse detected signal from the second detecting means 6-2. Integrating means 8-1, first baseband signal AD converting means 8-1, second baseband signal AD converting means 8-2, time reversing means 9 for time reversing the second digital signal, 10 digital Signal synthesis means 11 is a waveform for displaying a digital synthesized signal Display unit, 12 is a target (person or the like).

  By outputting a transmission clock from the synchronization control unit 1 to the UWB pulse generation unit 2, a UWB pulse is generated from the UWB pulse generation unit 2 and output from the transmission antenna unit 3a. Received by the unit 3b, the power distribution means 4 distributes the received signal into two power signals and supplies them to the first detection means 6-1 and the second detection means 6-2. The synchronization control means 1 supplies a first reception clock having a frequency that is smaller than the transmission clock frequency by a small number of clocks to the first gate pulse generation means 5-1, while the frequency of the transmission clock A second reception clock having a frequency higher by the number of minute clocks is supplied to the second gate pulse generating means 5-2. The first gate pulse is generated from the first gate pulse generation means 5-1 based on the first reception clock and supplied to the first detection means 6-1, thereby receiving from the power distribution means 4. The pulse distribution signal is detected at the timing of the first gate pulse, the second gate pulse is generated from the second gate pulse generating means 5-2 based on the second reception clock, and the second detecting means 6 is detected. -2 is supplied, the received pulse distribution signal from the power distribution means 4 is detected at the timing of the second gate pulse.

  The detection outputs of the first detection means 6-1 and the second detection means 6-2 are input to the first integration means 7-1 and the second integration means 7-2, respectively, and integration is performed. It is converted into a first baseband signal and a second baseband signal. Further, each baseband signal is converted into a digital signal by the first baseband signal AD conversion means 8-1 and the second baseband signal AD conversion means 8-2. The digital signal generated from the first baseband AD conversion means 8-1 is detected based on a reception clock having a frequency smaller than the transmission clock by a minute number of clocks. This represents a change from a position where the distance is short to a position far away. On the other hand, the digital signal generated from the second baseband AD conversion means 8-2 is detected based on the reception clock having a frequency that is a minute number larger than the transmission clock, and the signal waveform of the reception signal changes with time. On the other hand, a change from a position far from the target to a close position is shown.

  In order to match the time bases of the two baseband signal AD conversion means 8-1 and 8-2, the output of the second baseband signal AD conversion means 8-2 is time-reversed by the time reversal means 9 (nearly far away The time base is converted into the time, and the far time is converted into the near time. The two baseband signals (digital) having the same time axis are synthesized by the digital signal synthesis means 10 and displayed on the waveform display means 11.

  According to the present invention, the detection accuracy of a target object can be increased regardless of the moving direction of the target object. In addition, in the ultra-wideband radar apparatus that receives reflection from the target object by the equivalent time sampling method, the detection accuracy can be improved regardless of whether the target object moves away from or close to the ultra-wideband radar apparatus.

  FIG. 2 shows the configuration of the first embodiment of the present invention. In the figure, 20 is a target (corresponding to 12 in FIG. 1), 21 is a synchronization control section (corresponding to 1 in FIG. 1), 22 is a UWB pulse generating section (corresponding to 2 in FIG. 1), and 23a is a transmitting antenna section ( 1 corresponds to 3a in FIG. 1), 23b is a receiving antenna section (corresponding to 3b in FIG. 1), 24 is a power distribution section (corresponding to 4 in FIG. 1), 25-1, 25-2 are first and second UWB gate pulse generators (corresponding to 5-1 and 5-2 in FIG. 1), 26-1 and 26-2 are first and second detectors (corresponding to 6-1 and 6-2 in FIG. 1). , 27-1 and 27-2 are first and second integrators (corresponding to 7-1 and 7-2 in FIG. 1), and 28-1 and 28-2 are first and second baseband signals AD. Conversion unit (corresponding to 8-1 and 8-2 in FIG. 1), 29 is a digital signal time reversing unit (corresponding to 9 in FIG. 1), 30 is a digital signal synthesis unit (corresponding to 10 in FIG. 1), 31 is In the form display unit (corresponding to 11 of FIG. 1).

  FIG. 3 is a diagram showing signal waveforms at various parts in the first embodiment. The operation of FIG. 2 will be described with reference to FIG. A transmission clock signal is transmitted from the synchronization control unit 21 to the UWB pulse generation unit 22. The UWB pulse generation unit 22 repeatedly generates a UWB transmission pulse signal at the timing of the transmission clock signal transmitted from the synchronization control unit 21 as shown as an example in FIG. The pulse width of the UWB transmission pulse signal is, for example, 200 to 300 picoseconds. The frequency band is, for example, an ultra-wide band of several MHz to 5 GHz. A pulse repetition frequency (PRF) is determined by a transmission clock signal, and is set to 10 MHz, for example. The pulse amplitude of the UWB transmission pulse signal is 4 V, for example. The UWB transmission pulse signal is radiated in free space with respect to the target object in the transmission antenna unit 23a. As shown in FIG. 3A, the UWB transmission pulse signal is repeatedly generated for each cycle of the transmission clock signal transmitted from the synchronization control unit 1 and radiated from the transmission antenna unit 23a.

  The reflected wave reflected by the target object 20 is received by the receiving antenna unit 23b and becomes a UWB received pulse signal. An example of the UWB reception pulse signal is shown in FIG. Since the UWB transmission pulse signal is a reflected wave reflected from the target object 20, the UWB reception pulse signal is repeatedly received every cycle of the transmission clock signal, like the UWB transmission pulse signal. The UWB reception pulse signal is power-distributed by the power distribution unit 24 to become a first UWB reception pulse distribution signal and a second UWB reception pulse distribution signal. FIG. 3C shows an example of the first UWB reception pulse distribution signal, and FIG. 3H shows an example of the second UWB reception pulse distribution signal. Since the first UWB reception pulse distribution signal and the second UWB reception pulse distribution signal are signals in which the UWB reception pulse distribution signal is divided into two, the signal power is also divided into two, and the pulse signal whose pulse amplitude is halved Become.

  The synchronization control unit 21 transmits the first reception clock signal to the first UWB gate pulse generation unit 25-1, and the first UWB gate pulse generation unit 25-1 transmits from the synchronization control unit 21. The first gate pulse signal is repeatedly generated at the timing of the received first reception clock signal. The first reception clock signal is set to a PRF signal having a slightly lower frequency than the transmission clock signal output to the UWB pulse generation unit 22. For example, the PRF of the transmission clock signal is 10 MHz, whereas the PRF of the first reception clock signal is 9.99998 MHz. The difference between the transmission clock signal and the first reception clock signal is 20 Hz. In this case, the pulse repetition interval (PRI) of the transmission clock signal is 100 ns (1/10 MHz), whereas the PRI of the first reception clock signal is 100.0002 ns (1 / 9.99998 MHz).

  An example of the first gate pulse signal is shown in FIG. The first UWB reception pulse distribution signal becomes conductive during the pulse width of the first gate pulse signal, is detected by the first detection unit 26-1, and becomes the first reception pulse detection signal.

  FIG. 4 is a diagram illustrating the characteristics of the detection unit. The detection unit outputs a detection voltage according to the characteristics shown in FIG. 4 according to the input level that is input, and the first detection unit 26-1 in FIG. 2 sets the input level of the first UWB reception pulse distribution signal. In response, a first received pulse detection signal which is a voltage signal is output. Specifically, the first detection unit 26-1 is configured with a detector using, for example, an S-band detection Schottky barrier diode.

An example of the first received pulse detection signal is shown in FIG. The first received pulse detection signal is integrated by the first integrator 27-1. The integration is repeated until the timing of the first UWB reception pulse distribution signal and the first gate pulse signal match, and is output as a first baseband signal to become an equivalent time sampling signal. For example, in the above case, since the cycle of the first UWB reception pulse distribution signal is 100 ns and the cycle of the first gate pulse signal is 100.0002 ns, it is integrated 500,000 times until the respective timings coincide with each other. The first baseband signal whose axis is expanded by 500,000 times has a period of 50 ms. The first baseband signal is data in which signals are arranged on the time axis from the minimum distance point to the maximum distance point. An example of the first baseband signal is shown in FIG. The first baseband signal is AD-converted by the first baseband signal AD converter 28-1, and becomes the first digital signal. For example, if the sampling rate of AD conversion is 15000 samples / second, the data is 750 samples per 50 ms period of the baseband signal. Since the PRF of the UWB transmission pulse signal is 10 MHz, the maximum detection distance is 15 m (light speed 3 × 10 ⁸ [m / s] / 10 [MHz] / 2), and the distance resolution is 0.02 m. Become.

  The synchronization control unit 21 transmits the second reception clock signal to the second UWB gate pulse generation unit 25-2. The second UWB gate pulse generator 25-2 repeatedly generates a second gate pulse signal at the timing of the second reception clock signal transmitted from the synchronization controller 21. The second reception clock signal is set to a PRF signal having a slightly higher frequency than the transmission clock signal. For example, the PRF of the transmission clock signal is 10 MHz, whereas the PRF of the second reception clock signal is 10.00002 MHz. The difference between the transmission clock signal and the second reception clock signal is 20 Hz. In this case, the pulse repetition interval (PRI) of the transmission clock signal is 100 ns (1/10 MHz), whereas the PRI of the second reception clock signal is 99.9998 ns (1 / 10.00002 MHz). An example of the second gate pulse signal is shown in FIG. The second UWB reception pulse distribution signal becomes conductive during the pulse width of the second gate pulse signal, is detected by the second detection unit 26-2, and becomes a second reception pulse detection signal. Similar to the first detection unit 26-1, the second detection unit 26-2 outputs a second reception pulse detection signal that is a voltage signal according to the input level of the second UWB reception pulse distribution signal. . Similarly to the first detection unit 26-11, the second detection unit 26-2 can also be configured with a detector using an S-band detection Schottky barrier diode.

  An example of the second received pulse detection signal is shown in FIG. The second received pulse detection signal is integrated by the second integrator 27-2. The integration is repeated until the timing of the second UWB received pulse distribution signal and the second gate pulse signal coincide with each other, and is output as a second baseband signal. For example, in the above case, since the period of the first UWB reception pulse distribution signal is 100 ns and the period of the second gate pulse signal is 99.99998 ns, it is integrated 500,000 times until the respective timings coincide with each other. The second baseband signal whose axis is expanded by 500,000 times has a period of 50 ms.

  An example of the second baseband signal is shown in FIG. The second baseband signal is AD-converted by the second baseband signal AD converter 28-2 to become a second digital signal. An example of the second digital signal is shown in FIG. The second digital signal becomes a second digital time inversion signal in the digital signal time inversion unit 29.

  FIG. 5 is a diagram for explaining the operation of the digital signal time reversing unit and shows the principle that the sampling points are reversed on the time axis. That is, the second baseband signal is data in which signals are arranged on the time axis from the maximum distance point to the minimum distance point as shown in (a). By generating data with the sampling points inverted above, data on the time axis from the minimum distance point to the maximum distance point is obtained as shown in FIG. 5B. An example of the second digital time reversal signal is shown in FIG.

  The first digital signal and the second digital time reversal signal are combined in the digital signal combining unit 30 to become a digital combined signal.

  FIG. 6 is a diagram for explaining the operation of the digital signal synthesizer. The first digital signal as shown in (a) and the second digital time reversal signal as shown in (b) are arranged on the same time axis. By adding the amplitude of the signal for each sampling, a digital composite signal as shown in (c) is generated. The digital composite signal is displayed as a waveform in the waveform display unit 31.

  Here, the detection state of the moving target of the receiving method by the equivalent time sampling of the first embodiment shown in FIG. 2 is shown in FIG. 7, and compared with FIG. 20 showing the detection state of the moving target of the receiving method by the conventional equivalent time sampling. .

  In (1) of FIG. 7A, the time point (distance point) of the UWB reception pulse to be detected every time the first gate pulse signal is input in the first detection unit 26-1. Shows how the point moves from a point with a short time (a point with a short distance) to a point with a long time (a point with a long distance). Further, (2) in FIG. 7A shows the time point (distance) of the UWB reception pulse to be detected every time the second gate pulse signal is input in the second detector 26-2. (Point) shows a state where a point with a long time (point with a long distance) moves from a point with a long time (a point with a short distance) to a point with a short time. When the movement direction of the target object is the same as the time (distance) direction of the UWB reception pulse that is detected at each reception clock period, the time (distance) point of the reception wave that is detected with respect to the moving target object Will overtake, so the detection accuracy of the moving target object will be higher.

  FIG. 7A shows that when the target object moves away from the radar device, the first detection unit 26-1 and the first integration unit 27-1 can reliably capture the target object that moves. 7B shows that when the target object approaches the radar apparatus, the target object moving reliably can be captured by the second detection unit 26-2 and the second integration unit 27-2.

  On the other hand, when the target object moves away from the radar apparatus, the detection state of the moving target in the conventional reception method based on equivalent time sampling is detected with respect to the moving target object as shown in FIG. Since the time (distance) point of the UWB reception pulse to be overtakes, the target object can be reliably captured, but when the target object approaches the radar device, it is shown in FIG. Thus, since the time (distance) point of the UWB reception pulse to be detected faces the moving target object, it indicates that the target object cannot be captured.

  Therefore, by configuring the ultra-wideband radar apparatus by the equivalent time sampling reception method shown in the first embodiment, the detection accuracy of the target object can be increased regardless of the moving direction of the target object.

  Next, FIG. 8 is a diagram illustrating the configuration of the second embodiment. In FIG. 8, reference numerals 20 to 22, 23a, 23b, 24, 26-1 to 28-2, and 29 to 31 are the same as the parts having the same reference numerals shown in the second embodiment of FIG. In the configuration of the second embodiment, the difference from the first embodiment is that in the first embodiment, the second gate pulse signal supplied to the second detection unit 26-2 is received by the second reception clock from the synchronization control unit 21. In the second embodiment, the first UWB gate pulse generator 25-2 receives the first gate pulse signal generated from the first UWB gate pulse generator 25-2. The UWB gate pulse delay unit 32 is provided, and the output of the UWB gate pulse delay unit 32 is supplied to the second detection unit 26-2.

  In the configuration of the second embodiment, the detection of the second UWB reception pulse distribution signal from the power distribution unit 24 uses the first gate pulse signal generated by the first UWB gate pulse generation unit 25-1 as the UWB gate. The second detector 26-2 performs the second gate pulse generated by delaying the time by the pulse delay unit 32. As the first gate pulse signal and the second gate pulse signal, for example, a pulse width of 200 to 300 picoseconds and a signal equivalent to the UWB pulse signal can be used.

  By adopting the configuration of the second embodiment of FIG. 8, the UWB gate pulse delay unit that delays the first gate pulse signal in time without providing the second UWB gate pulse generation unit 25-2 as in the first embodiment. By providing 32, a second gate pulse signal for operating the second detector 26-2 can be generated.

  FIG. 9 is a diagram illustrating the configuration of the ultra wideband radar device according to the third embodiment of the present invention. 9, reference numerals 20 to 22, 23 a, 23 b, 24, 26-1 to 28-2, and 29 to 31 are the same as the respective parts denoted by the same reference numerals in FIGS. 2 and 8 showing the configuration of the first and second embodiments. Therefore, explanation is omitted. The difference from the second embodiment in the configuration of the third embodiment is that a first UWB pulse delay unit 33 is provided instead of the first UWB gate pulse generator 25-1 of the second embodiment.

  In FIG. 9 of the third embodiment, the detection of the first UWB reception pulse distribution signal from the power distribution unit 24 is performed by delaying the UWB pulse signal generated by the UWB pulse generation unit 22 by the first UWB pulse delay unit 33. The first detector 26-1 is operated during the first gate pulse signal generated in this manner. The second UWB reception pulse distribution signal is detected by a second gate generated by delaying the first gate pulse signal generated by the first UWB pulse delay unit 33 by the UWB gate pulse delay unit 32. The second detector 26-2 was operated during the pulse. By adopting the configuration of the third embodiment (FIG. 9), the first UWB gate pulse generator 25-1 and the second UWB gate pulse generator 25-2 of the first and second embodiments are not provided. By providing a first UWB pulse delay unit 33 that delays the UWB pulse signal in time and a UWB gate pulse delay unit 32 that delays the first gate pulse signal in time, the first detector 26-2 is operated. The first gate pulse signal and the second gate pulse signal for operating the second detector 26-2 can be generated. By providing the first UWB pulse delay unit 33 and the UWB gate pulse delay unit 32, the first UWB gate pulse generation unit 25-1, the second UWB gate pulse generation unit as in the first embodiment (FIG. 2). Cost can be reduced as compared with the case of providing 25-2.

  FIG. 10 is a diagram illustrating the configuration of the ultra-wideband radar apparatus according to the fourth embodiment. 10, reference numerals 20 to 22, 23 a, 23 b, 24, 26-1 to 28-2, 29 to 31, and 32 and 33 are the same as the respective parts having the same reference numerals in FIG. Omitted. Reference numeral 34 denotes a second UWB pulse delay unit.

  In the configuration of the fourth embodiment, the UWB pulse delay unit 32 that receives the first gate pulse signal output from the first UWB pulse delay unit 33 in the third embodiment is provided, whereas the second UWB pulse delay is provided. A unit 34 is provided to receive a UWB pulse signal generated from the UWB pulse generation unit 22 and generate a second gate pulse signal.

  The detection of the first UWB reception pulse distribution signal is performed between the first gate pulse signal generated by delaying the UWB pulse signal generated by the UWB pulse generation unit 22 by the first UWB pulse delay unit 33. The first detection unit 26-1 is operated. The detection of the second UWB reception pulse distribution signal is performed by detecting the second gate pulse signal generated by delaying the UWB pulse signal generated by the UWB pulse generator 22 by the second UWB pulse delay unit 34. In the meantime, the second detector 26-2 was operated. With the configuration shown in FIG. 10, the UWB pulse signal is time-delayed without providing the first UWB gate pulse generator 25-1 and the second UWB gate pulse generator 25-2 as in the first embodiment. By providing the first UWB pulse delay unit 33 and the second UWB pulse delay unit 34, the first gate pulse signal for operating the first detection unit 26-1 and the second detection unit 26-2 are provided. A second gate pulse signal to be operated can be generated.

  FIG. 11 is a diagram showing the configuration of the fifth embodiment of the present invention. 11, reference numerals 20 to 22, 23a, 25-1 to 28-2, and 29 to 31 are the same as those of the same reference numerals in FIG. Reference numeral 23b denotes a first reception antenna unit, and reference numeral 23c denotes a second reception antenna unit.

  The configuration of the fifth embodiment is different from those of the first to fourth embodiments, in that the reflected wave from the target is received by the first receiving antenna unit 23b and the second receiving antenna unit 23c, and the power distributing unit 24 This is a point that is not used. In FIG. 11, a first UWB reception pulse signal and a second UWB reception pulse signal from each of the reception antenna units 23b and 23c are detected by a first detector 26-1 and a second detector 26-2, respectively. I tried to do it. With the configuration of FIG. 11, each UWB reception pulse signal is detected by providing two reception antenna units without providing the power distribution unit 24 used in the first to fourth embodiments. be able to.

  FIG. 12 is a diagram showing the configuration of the sixth embodiment of the present invention. In FIG. 12, reference numerals 20 to 22, 23a, 23b, 24, 25-1 to 28-2, and 29 to 31 are the same as those of the same reference numerals in the first embodiment (FIG. 2), and the description thereof is omitted. Reference numeral 35 denotes a UWB pulse amplifier.

  In the sixth embodiment, a UWB pulse amplification unit 35 that amplifies the output of the UWB pulse generation unit 22 is provided. With the configuration as shown in FIG. 12, the power of the UWB transmission pulse signal radiated from the transmission antenna unit 23a is increased, and a target object at a longer distance can be detected.

  FIG. 13 is a diagram showing the configuration of the seventh embodiment of the present invention. In FIG. 13, reference numerals 20 to 22, 23a, 23b, 24, 25-1 to 28-2, and 29 to 31 are the same as those of the same reference numerals in the first embodiment (FIG. 2), and the description thereof is omitted. Reference numeral 36 denotes a UWB pulse band filtering unit.

  With the configuration of the seventh embodiment, the UWB pulse signal generated by the UWB pulse generator 22 is band-passed by the UWB pulse band filtering unit 36 that passes only a predetermined frequency band. With the configuration of FIG. 13, for example, only the frequency band of 3.4 to 4.8 GHz conforming to the UWB spectrum mask in Japan can be radiated from the transmitting antenna unit 23a.

  FIG. 14 is a diagram showing the configuration of the eighth embodiment of the present invention. In FIG. 14, reference numerals 20 to 22, 23 a, 23 b, 24, 25-1 to 28-2, and 29 to 31 are the same as the parts having the same reference numerals in the first embodiment (FIG. 2), and the description thereof is omitted. Reference numeral 37 denotes a reception pulse amplification unit.

  In the configuration of the eighth embodiment, the UWB reception pulse signal received by the reception antenna unit 23b is amplified by the reception pulse amplification unit 37. With the configuration of FIG. 14, the power of the UWB reception pulse signal received by the reception antenna unit 23b is increased, and a target object at a longer distance can be detected.

  FIG. 15 is a diagram showing the configuration of the ninth embodiment of the present invention. In FIG. 15, reference numerals 20 to 22, 23 a, 23 b, 24, 25-1 to 28-2, and 29 to 31 are the same as those of the same reference numerals in the first embodiment (FIG. 2), and the description thereof is omitted. Reference numeral 38 denotes a first baseband signal amplification unit, and 39 denotes a second baseband signal amplification unit.

  In the configuration of the ninth embodiment, the first baseband signal output from the first integrator 27-1 is amplified by the first baseband signal amplifier 38, and the second integrator 27-2 is amplified. The second baseband signal output from the second baseband signal amplifying unit 39 is amplified. With the configuration of FIG. 15, the voltages of the first baseband signal and the second baseband signal are increased, and a farther target object can be detected.

  FIG. 16 is a diagram showing the configuration of the tenth embodiment of the present invention. In FIG. 16, reference numerals 20 to 22, 23a, 23b, 24, 25-1 to 28-2, and 29 to 31 are the same as those of the same reference numerals in the first embodiment (FIG. 2), and the description thereof is omitted. Reference numeral 40 denotes a movement target detection processing unit.

  In the configuration of the tenth embodiment (FIG. 16), the moving target detection processing unit 40 detects only the signal component of the moving target from the digital synthesized signal synthesized by the digital signal synthesizing unit 30.

  FIG. 17 is a diagram showing an example of a signal waveform by the moving target detection process, which is executed in the moving target detection processing unit 40 of FIG. (A), (b), and (c) in FIG. 17 indicate digital composite signals at times t1, t2, and t3, respectively. By calculating the difference between the digital composite signals at time t1 in (a) and time t2 in (b) among these composite signals, the moving target signal shown in (d) is obtained. Further, the moving target signal shown in (e) is obtained by obtaining the difference between the digital composite signal at time t2 shown in (b) and time t3 shown in (c).

  By providing the moving target detection processing unit 40 of FIG. 16, it is possible to detect only a moving target signal from a digital composite signal including signal components of a stationary object and a moving object, for example, detecting only a walking person. it can.

  (Supplementary note 1) Ultra-wideband (UWB) pulses are repeatedly generated and transmitted to the target object, reflected waves from the target object are received, sampled and integrated, and time-expanded to a baseband signal. -UWB pulse generating means for generating a UWB transmission pulse signal based on a transmission clock from a transmission antenna unit and a UWB pulse reflected by a target object in an ultra-wideband radar apparatus that detects and displays a moving target component after digital conversion A power distribution means for receiving a signal at a receiving antenna unit and distributing the signal to first and second received pulse signals; and generating a transmission clock and a frequency having a low frequency at a minute ratio to the frequency of the transmission clock. A synchronization control unit for generating a reception clock of 1 and a second reception clock having a high frequency at a minute rate, and the first and second First and second gate pulse generating means for generating first and second gate pulses corresponding to the transmission clock, and the first and second received pulse distribution by the first and second gate pulses. First and second detection / integration means for detecting and integrating the signal to generate first and second baseband signals, and first and second for converting the first and second baseband signals into digital signals A second AD conversion means, a time inversion means for rearranging the digital signals from the second AD conversion means so as to invert the time, a digital signal from the first AD conversion means and the time inversion means. An ultra-wideband radar apparatus comprising: digital signal synthesis means for synthesizing an inverted digital signal; and waveform display means for displaying the signal synthesized by the digital synthesis means.

  (Supplementary Note 2) As a second gate pulse generating means for generating the second gate pulse, a gate pulse delay means for generating a second gate pulse by inputting an output signal of the first gate pulse generating means. The ultra-wideband radar apparatus according to appendix 1, wherein the second received pulse signal is detected and integrated by a gate pulse signal delayed by the gate pulse delay means.

  (Supplementary Note 3) As the first gate pulse generating means for generating the first gate pulse, UWB pulse delay means for delaying the UWB pulse signal from the UWB pulse generating means is provided, and the second gate pulse is As a means for generating, UWB gate pulse delay means for further delaying the first gate pulse signal generated from the UWB pulse delay means is provided, and a second gate pulse signal from the UWB gate pulse delay means is used to generate a second gate pulse signal. The ultra-wideband radar device according to appendix 1, wherein the received pulse signal is detected and integrated.

  (Supplementary Note 4) As the second gate pulse signal generating means, a UWB pulse signal from the UWB pulse generating means is inputted and time delayed to generate a second gate pulse signal. Second UWB pulse delay means The ultra-wideband radar device according to appendix 3, which is provided.

  (Supplementary Note 5) Two reception antenna units for receiving the UWB transmission pulse reflected by a target object are provided, and each UWB reception pulse signal received by each reception antenna unit is converted into the first and second detection / integration means. 2. The ultra-wideband radar apparatus according to claim 1, wherein the signal is detected and integrated by being input to the signal.

  (Supplementary note 6) The UWB pulse amplifying unit according to claim 1, further comprising a UWB pulse amplifying unit for amplifying the UWB pulse signal generated from the UWB pulse generating unit.

  (Supplementary note 7) The UWB pulse band filtering unit according to claim 1, further comprising a UWB pulse band filtering unit that allows the UWB pulse signal generated from the UWB pulse generation unit to pass only in a predetermined frequency band.

  (Additional remark 8) The ultra wideband radar apparatus of Claim 1 provided with the receiving pulse amplification part which amplifies the UWB receiving pulse signal received with the said receiving antenna part.

  (Supplementary note 9) The ultra-wideband according to claim 1, further comprising two baseband signal amplifying means for amplifying two baseband signals output from the first and second detection / integration means, respectively. Radar device.

(Appendix 10)
2. The ultra wideband radar apparatus according to claim 1, further comprising a moving target detection processing unit that detects only a signal component of the moving target from the digital combined signal synthesized by the digital signal combining unit.

  (Supplementary Note 11) A signal of an ultra-wideband radar apparatus that repeatedly generates and transmits an ultra-wideband (UWB) pulse to a target object, receives a reflected wave from the target object, and detects and displays a moving target component In the processing method, the UWB pulse is transmitted from the transmission antenna unit based on the transmission clock generated from the synchronization control unit, and the ultra wideband pulse signal reflected by the target object is received by the reception antenna unit to receive the first and second received pulses. Power is distributed from the synchronization control unit to generate a first reception clock having a low frequency and a second reception clock having a high frequency at a minute ratio with respect to the frequency of the transmission clock. The detected first received pulse is detected and integrated by a gate pulse based on the first received clock to generate a first baseband signal, and the distributed second received pulse is generated. The second baseband signal is generated by detecting and integrating the received pulse with the gate pulse based on the second reception clock, and the digital signal generated by AD conversion of the second baseband signal is time-reversed. The signal processing of the ultra-wideband radar apparatus, wherein the obtained signal and the digital signal obtained by AD conversion of the first baseband signal are synthesized and the synthesized digital signal is displayed as a waveform Method.

It is a figure which shows the principle structure of this invention. It is a figure which shows the structure of Example 1 of this invention. 6 is a diagram illustrating an example of a signal waveform generated by the operation of each unit of the first embodiment. FIG. It is a figure which shows the characteristic of a detection part. It is a figure explaining operation | movement of a digital signal time inversion part. It is a figure explaining operation | movement of a digital signal synthetic | combination part. It is explanatory drawing which shows the detection state of the movement target by the reception method of the equivalent time sampling of this invention. It is a figure which shows the structure of Example 2 of this invention. It is a figure which shows the structure of Example 3 of this invention. It is a figure which shows the structure of Example 4 of this invention. It is a figure which shows the structure of Example 5 of this invention. It is a figure which shows the structure of Example 6 of this invention. It is a figure which shows the structure of Example 7 of this invention. It is a figure which shows the structure of Example 8 of this invention. It is a figure which shows the structure of Example 9 of this invention. It is a figure which shows the structure of Example 10 of this invention. It is a figure which shows the example of the signal waveform by a movement target detection process. It is a figure which shows the structure of the conventional ultra-wideband radar apparatus. It is a figure which shows the example of the operation waveform of each part by the structure of a prior art example. It is explanatory drawing of the detection state of the movement target by the reception method of the conventional equivalent time sampling.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Synchronization control means 2 UWB pulse generation means 3a Transmission antenna part 3b Reception antenna part 4 Power distribution means 5-1 1st gate pulse generation means 5-2 2nd gate pulse generation means 6-1 1st detection means 6 -2 2nd detection means 7-1 1st integration means 7-2 2nd integration means 8-1 1st baseband signal AD conversion means 8-2 2nd baseband signal AD conversion means 9 Time reversal Means 10 Digital signal synthesizing means 11 Waveform display means 12 Target

Claims (4)

Ultra-wideband (UWB) pulses are repeatedly generated and transmitted to the target object, and the reflected wave from the target object is received, sampled and integrated, and time-expanded to a baseband signal, and analog-to-digital converted. Later, in the ultra-wideband radar device that detects and displays the moving target component,
UWB pulse generation means for generating a UWB transmission pulse signal based on the transmission clock from the transmission antenna unit, and the UWB pulse signal reflected by the target object is received by the reception antenna unit and distributed to the first and second reception pulse signals Power distribution means,
A synchronization control unit for generating the transmission clock and generating a first reception clock having a low frequency and a second reception clock having a high frequency at a minute ratio with respect to the frequency of the transmission clock;
First and second gate pulse generating means for generating first and second gate pulses corresponding to the first and second reception clocks;
First and second detection and integration for generating first and second baseband signals by detecting and integrating the first and second received pulse distribution signals by the first and second gate pulses, respectively. Means,
First and second AD conversion means for converting the first and second baseband signals into digital signals;
Time reversing means for rearranging the digital signals from the second AD converting means so that the time is reversed;
Digital signal synthesizing means for synthesizing the digital signal from the first AD converting means and the digital signal inverted by the time inverting means;
An ultra-wideband radar apparatus comprising waveform display means for displaying a signal synthesized by the digital synthesis means.   As the second gate pulse generating means for generating the second gate pulse, there is provided a gate pulse delay means for generating a second gate pulse by inputting an output signal of the first gate pulse generating means, 2. The ultra-wideband radar apparatus according to claim 1, wherein the second received pulse signal is detected and integrated by a gate pulse signal delayed by a pulse delay means. Two receiving antenna units for receiving the UWB transmission pulse reflected from the target object are provided.
2. The UWB radar apparatus according to claim 1, wherein each UWB received pulse signal received by each receiving antenna unit is input to the first and second detection / integration means for detection and integration. In a signal processing method of an ultra-wideband radar device that repeatedly generates and transmits an ultra-wideband (UWB) pulse to a target object, receives a reflected wave from the target object, and detects and displays a moving target component,
A UWB pulse is transmitted from the transmitting antenna unit based on the transmission clock generated from the synchronization control unit,
Receiving the ultra-wideband pulse signal reflected by the target object at the receiving antenna unit and distributing the power to the first and second received pulses;
Generating a first reception clock having a low frequency and a second reception clock having a high frequency at a minute rate from the synchronization control unit at a minute rate with respect to the frequency of the transmission clock;
Detecting and integrating the distributed first reception pulse by a gate pulse based on the first reception clock to generate a first baseband signal;
A second baseband signal is generated by detecting and integrating the distributed second received pulse with a gate pulse based on the second received clock;
Combining a signal obtained by time-reversing a digital signal generated by AD conversion of the second baseband signal and a digital signal obtained by AD conversion of the first baseband signal;
Displaying a waveform of the synthesized digital signal;
A signal processing method for an ultra-wideband radar apparatus.

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