JP2007003079A - Laser guide device for missile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in a conventional laser guide device for a missile that it easily senses jamming by sunlight or the like. <P>SOLUTION: This device for guiding a missile F by receiving reflection light LR of laser beam LT irradiated to a target T, comprises a light transmitting means 1 for transmitting the laser beam LT in a pulsed state on the basis of a prescribed base time, and a light receiving means 2 for receiving detected light LR at the missile F. The operation of the light receiving means 2 is controlled on the basis of the common base time with the light transmitting means 1, and the light receiving means 2 intermittently detects a signal of the reflection light LR corresponding to a transmission timing of the laser beam of the light transmitting means 1. The pulsed transmission timing of the laser beam LT and the intermittent signal detection timing of the reflection light LR are synchronized, so that the laser guide device hardly receives jamming, and its guiding function can be improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention mainly relates to a flying object laser guiding apparatus used for performing guidance control of a flying object in a semi-active manner using laser light.

  For example, as shown in FIG. 3, the semi-active type laser guidance device irradiates laser light LT in a pulse shape from a laser irradiator A toward a target T, and the target T is received by the light receiving means 101 mounted on the flying object F. The reflected light LR is received, and the flying object F is guided and controlled toward the target T based on the determination signal of the reflected light LR.

The optical receiving means 101 can determine the presence or absence of signal detection based on the signal intensity of the received reflected light LR. The receiving circuit 102 receives the reflected light LR, the amplifier 103 amplifies the received signal of the receiving circuit 102, A determination circuit 104 that obtains a determination signal of the reflected light LR by determining the threshold value of the received signal that has passed through the amplifier 103 is provided, and the distance from the flying object F to the target T is determined based on the determination signal obtained by the determination circuit 104. be able to.
“Missile Engineering Encyclopedia” Hara Shobo, December 10, 1990, p. 61,408,440,441

  However, in the flying body laser guidance device as described above, the light receiving means always performs reception and determines the presence or absence of signal detection based on the received signal intensity. There is a problem that it is easy to be sensitive to jamming, and it has been a problem to solve such a problem.

  The present invention has been made paying attention to the above-described conventional problems, and by synchronizing the transmission timing of laser light and the timing of signal detection of detected light that is scattered light or reflected light of laser light. It is an object of the present invention to provide a flying body laser guidance device that is less susceptible to jamming and that can improve the guidance function.

  The flying object laser guiding apparatus of the present invention is an apparatus for guiding a flying object by receiving light to be detected which is scattered light or reflected light of a laser beam irradiated on a target, and is based on a predetermined reference time. An optical transmission means for transmitting light in pulses, and an optical reception means for receiving detected light in the flying object, and the optical reception means is controlled in operation based on a reference time common to the optical transmission means The light transmitting means is configured to intermittently detect the signal of the detected light in response to the transmission timing of the laser light, and the structure described above serves as means for solving the conventional problems.

  Further, in the flying body laser guiding device of the present invention, as a more desirable embodiment, the optical receiving means receives the detected light, and the gate circuit intermittently generates the gate signal based on the reference time. And a signal processing circuit that integrates the received signal of the optical receiver circuit acquired while the gate signal of the gate circuit is generated, and obtains a determination signal of the detected light by determining the threshold value of the integrated value. The optical transmission means is means for transmitting laser light in an irregular pattern, and the optical reception means is means for detecting the signal of the detected light in the same pattern as the transmission pattern of the optical transmission means. Further, the optical transmission means and the optical reception means include a radio wave reception circuit for using the transmission signal of the artificial satellite as a reference time.

  According to the flying body laser guidance apparatus of the present invention, based on the common reference time, the pulsed transmission timing of the laser light by the light transmitting means and the intermittent signal detection timing of the detected light by the light receiving means The signal detection of the detected light can be easily and reliably performed, and at the same time, the received light other than the detected light can be largely eliminated in the signal processing, and sunlight and various reflections It becomes difficult to be jammed by light, and an improvement in guidance function can be realized. In addition, since the optical receiving means has a clear reception timing and is not easily jammed as described above, it is possible to use a highly sensitive one.

  Furthermore, according to the flying body laser guidance apparatus of the present invention, the above-described effect can be obtained by adopting the optical receiving means including the optical receiving circuit, the gate circuit, and the signal processing circuit, and the signal processing circuit can receive a signal. An integration type amplifier can be used, thereby improving the signal-to-noise ratio and realizing more accurate signal processing.

  Furthermore, according to the flying body laser guidance device of the present invention, the laser light transmission timing and the detection light signal detection timing are synchronized with an irregular pattern, for example, so that the laser light transmission timing is It becomes complicated and can improve confidentiality.

  Furthermore, according to the flying body laser guidance device of the present invention, the satellite transmission signal can be used as a reference time so that it can be used in any region and can contribute to higher accuracy of guidance control. Become.

  FIG. 1 is a view for explaining an embodiment of a flying body laser guiding apparatus according to the present invention. In this embodiment, a description will be given of a semi-active laser guidance device that uses reflected light of laser light emitted toward a target as light to be detected.

  The flying object laser guiding apparatus shown in FIG. 1A irradiates a pulsed laser beam LT toward the target T from the light transmitting means 1 of the laser irradiator A, and receives the light receiving means 2 mounted on the flying object F. Then, the reflected light LR from the target T is received, and the flying object F is guided and controlled toward the target T based on the determination signal of the reflected light LR.

  The optical transmission means 1 transmits the laser light LT in a pulse shape based on a predetermined reference time, and uses a transmission signal regularly generated by an artificial satellite such as a GPS satellite as the reference time. A radio wave receiving circuit (for example, GPS clock) 11 for receiving a transmission signal, a synchronous clock 12 linked to the radio wave receiving circuit 11, and a laser oscillator 13 for transmitting the laser light LT in response to a command from the synchronous clock 12 are provided.

  On the other hand, the optical receiver 2 is controlled in operation based on a reference time common to the optical transmitter 1, and intermittently detects the signal of the reflected light LR in accordance with the transmission timing of the laser light LT of the optical transmitter 1. Similar to the optical transmitter 1, the radio receiver 21 and the synchronous clock 22 are provided, the optical receiver 23 for receiving the reflected light LR using an optical sensor, and the reference signal that has passed through the synchronous clock 22 Based on this, a gate circuit 24 that intermittently generates a gate signal and a signal processing circuit 25 that receives the received signal of the reflected light LR and the gate signal are provided.

  The signal processing circuit 25 integrates the received signal of the optical receiving circuit 23 acquired while the gate signal of the gate circuit 24 is being generated, and a threshold value of the integrated value to determine the detection signal of the detected light. The determination circuit 27 is provided, and the S / N ratio is improved by using a signal integration type amplifier for the amplifier 26, thereby enabling more accurate signal processing.

  For example, a YAG laser is used for the laser oscillator 13 of the optical transmission means 1 and includes a transmission optical system in addition to a laser transmission source. The optical receiver circuit 23 of the optical receiver 2 includes a receiving optical system and optical sensor, and an electronic circuit that converts an optical signal into an electrical signal.

  Next, the operation of the laser guidance device having the above configuration will be described using a time chart of each signal shown in FIG.

  The light transmitting means 1 of the laser irradiator A and the light receiving means 2 of the flying object F receive regular transmission signals from the artificial satellites by the respective radio wave receiving circuits 11 and 21, and use this as a common reference time. Each operation is performed based on the reference time. In FIG. 1B, a vertical dotted line group indicates a reference time, and each vertical dotted line indicates a reference time at regular intervals.

  The optical transmission unit 1 transmits the laser light LT in a pulse shape from the laser oscillator 13 toward the target T. At this time, the transmission signal S1 of the laser beam LT may be at regular intervals based on the reference time. However, in the illustrated example, after transmission is performed at the time when the elapsed time t1 has elapsed from the initial reference time, Transmission is performed when the elapsed time t2 has passed from the next reference time, and thereafter, the transmission pattern is such that the two elapsed times t1 and t2 are alternately repeated.

  In the flying object F flying toward the target T, the light receiving means 2 receives the reflected light LR from the target T in the light receiving circuit 23 and converts it into a received signal S2, and also the gate circuit 24. Then, the gate signal S3 is generated intermittently based on the reference time common to the optical transmission means 1. The gate signal S3 is generated at a constant interval or at an interval corresponding to the transmission timing of the transmission signal S1, but in either case, the gate signal S3 has a constant width (time) so that the reception timing of the reception signal S2 of the reflected light LR is included. )have.

  Here, the light receiving circuit 23 may receive not only the reflected light LR from the target T but also light such as sunlight. That is, FIG. 1B shows only the received signal S2 of the reflected light LR, but the actual received signal S2 may include signals other than the reflected light LR over time.

  On the other hand, in the laser guidance device, the operation of the optical transmission unit 1 and the optical reception unit 2 is controlled based on a common reference time, and the above-described gate signal S3 is generated intermittently in the optical reception unit 2. Therefore, the reception signal S2 of the reflected light LR from the target T is always input while the gate signal S3 is generated. In other words, it corresponds to the reception timing of the reflected light LR from the target T. Thus, the gate signal S3 is generated intermittently.

  Therefore, in the optical receiver 2, the received signal S2 and the gate signal S3 are input to the amplifier 26 of the signal processing circuit 25, and the received signal S2 of the reflected light LR acquired while the gate signal S3 is generated is integrated ( Then, the determination circuit 27 obtains a determination signal S5 of the reflected light LR by determining a threshold value of the integrated value of the reception signal S2 in the determination circuit 27.

  As described above, the laser guidance device determines the pulse-like transmission timing of the laser beam LT by the optical transmission unit 1 and the intermittent signal detection timing of the reflected light LR by the optical reception unit 2 based on the common reference time. Since it is synchronized, the signal detection of the reflected light LR is easy and reliable.

  In particular, in the signal processing, the transmission signal S1, the reception signal S2, and the gate signal S3 are pulses for a very short time, and only the reception signal S2 acquired while the gate signal S3 is generated is signal-processed. The probability of receiving powerful light other than the reflected light LR and processing it during the generation of the gate signal S3 is very low, so that light other than the reflected light LR can be largely eliminated, It becomes difficult to be jammed by light.

  Furthermore, the determination signal S5 obtained by the determination circuit 27 can be used for measuring the distance from the flying object F to the target T. That is, the determination signal S5 is delayed with respect to the transmission signal S1 of the optical transmission means 1 by a time corresponding to the distance from the laser irradiator A to the flying object F via the target T, and Since the transmission signal S1 of the transmission means 1 has the elapsed times t1 and t2 with respect to the reference time, it similarly has the elapsed times T1 and T2 with respect to the reference time.

  Therefore, the first elapsed time t1 of the transmission signal S1 with respect to the reference time is set in advance in the optical transmission unit 1 and the optical reception unit 2, and the optical transmission unit 1 transmits the laser beam LT toward the target T and The reflected light LR is received, the distance Ro to the target T is measured based on the time difference between transmission and reception and the speed of light C, and the elapsed times t1 and t2 of the transmission signal S1 are t2 = t1 + Ro / C. Set to. Thereby, the elapsed times t1 and t2 of the transmission signal S1 include information on the distance Ro from the laser irradiator A to the target T in the time difference.

  On the other hand, in the light receiving means 2 of the flying object F, the difference between the elapsed times T1 and T2 of the determination signal S5 is the same as the difference between the elapsed times t1 and t2 of the transmission signal S1, so that time difference (T2−T1 = Ro / C) makes it possible to determine the distance Ro from the laser irradiator A to the target T.

  The optical receiving means 2 is controlled in operation based on a common reference time with the optical transmitting means 1, and the difference between the preset elapsed time t1 of the transmission signal S1 and the elapsed time T1 of the determination signal S5, and the speed of light C Therefore, the distance (Ro + R) from the laser irradiator A through the target T to the flying object F can be determined. Therefore, the elapsed time t1 of the transmission signal S1, the elapsed time T1 of the determination signal S5, and the target from the laser irradiator A The distance R from the target T to the flying object F can be determined based on the relationship between the distance Ro to T and the speed of light C (T1-t1-Ro / C = R / C).

  Furthermore, as another method for measuring the distance from the flying object F to the target T based on the determination signal S5, the elapsed times t1 and t2 of the transmission signal S1 can be set as t2 = t1-2Ro / C. Even in this case, the elapsed time t1 of the transmission signal S1 is set in advance in the optical transmitter 1 and the optical receiver 2, and the distance Ro from the laser irradiator A to the target T is measured in the optical transmitter 1. To do.

On the other hand, in the light receiving means 2 of the flying object F, the difference between the elapsed times T1 and T2 of the determination signal S5 is the same as the difference between the elapsed times t1 and t2 of the transmission signal S1, and the elapsed time T1 of the determination signal S5. The sum (T1 + T2) of T2 is the initial elapsed time t1 of the transmission signal S1, the next elapsed time t2 (= t1-2Ro / C), the initial elapsed time t1 of the transmission signal S1, and the determination signal S5. The difference between the first elapsed time T1 [T1-t1 (= Ro / C + R / C)] and the difference between the next elapsed time t2 of the transmission signal S1 and the next elapsed time T2 of the determination signal S5 [T2-t2 (= Ro / C + R / C)], the distance R from the target T to the flying object F can be obtained by the following formulas 3 to 5, which makes it easier to use.
T1 + T2 = 2t1-2Ro / C + 2Ro / C + 2R / C Formula 1
T1 + T2 = 2t1 + 2R / C Equation 2
∴R / C = [(T1 + T2) / 2−t1] Equation 3

  FIG. 2 is a view for explaining another embodiment of the flying body laser guiding apparatus according to the present invention. The same components as those in the previous embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the illustrated embodiment, the laser guiding apparatus is mounted on the flying object F so that the flying object F can be launched on the mother machine (or launcher) M, whereas the flying object F has the entire structure of the light receiving means 2 mounted thereon. Yes, the mother machine M is provided with a radio wave receiving circuit (for example, GPS clock) 21 that constitutes the light receiving means 2, and the flying object F is provided with the light receiving circuit 23 that constitutes the light receiving means 2, a gate circuit 24, and an amplifier. 26 and a determination circuit 27, and an oscillation circuit 32 in place of the synchronous clock (22) of the previous embodiment.

  In this case, if the operating time of the flying object F is short (for example, several tens of seconds), the oscillation circuit 32 may use a built-in high-accuracy crystal oscillator (for example, OCXO: Oven Controlled Xtal Oscillator). The main body M and the flying object F are connected to the radio wave receiving circuit 21 via a connector 50 that detachably connects, and is initialized before the flying object F is fired from the mother machine M.

  In the case of the above-described embodiment, the structure of the flying object F side can be simplified by dividing the light receiving means 2 into the mother machine M side and the flying object F side. When F is mounted, a common radio wave receiving circuit 21 can be used for each flying object F.

  Further, in the case of the above embodiment, the optical transmission means 1 may be provided in a laser irradiator (shown by a virtual line) A installed on the ground or the like as in the previous embodiment, or shown by a virtual line in the figure. As such, it may be mounted on the mother machine M. If the optical transmission means 1 is mounted on the mother machine M, the radio wave reception circuit (11) of the optical transmission means 1 and the radio wave reception circuit 11 of the optical reception means 2 can be made common, and the structure is further simplified. Can be realized.

  The laser guidance device of each of the above embodiments can use, for example, a transmission signal from a predetermined ground station as a reference time, but by using a transmission signal of an artificial satellite as a common reference time, But it can be used.

  Further, in each of the above-described embodiments, the optical transmission unit 1 sets the two elapsed times t1 and t2 and transmits the laser light LT. However, the optical transmission unit 1 is irregular by increasing the set number of elapsed times. Of the reflected light LR with the same pattern as the transmission pattern of the optical transmission means 1, that is, the transmission timing of the laser light LT and the signal detection of the reflected light LR. If the timing is synchronized with an irregular pattern, the secrecy can be further enhanced as the pattern becomes more complicated.

  Further, in the above-described embodiment, the case where the reflected light LR of the laser beam LT transmitted toward the target T is received and guidance control is performed is illustrated. However, the laser guidance device transmits the target T, for example, The present invention can also be applied to beam lidar type guidance control that receives scattered light of laser light as detected light.

It is explanatory drawing (a) which shows one Example of the laser guidance apparatus of the flying body concerning this invention, and the time chart (b) explaining each signal. It is explanatory drawing which shows the other Example of the laser guidance apparatus of the flying body concerning this invention. It is explanatory drawing (a) which shows the conventional laser light guidance apparatus of a flying body, and the time chart (b) explaining each signal.

Explanation of symbols

F Flying object LR Reflected light (detected light)
LT Laser light T Target 1 Optical transmission means 2 Optical reception means 23 Optical reception circuit 24 Gate circuit 25 Signal processing circuit 11 21 Radio wave reception circuit

Claims (4)

  An apparatus for receiving detected light that is scattered light or reflected light of a laser beam irradiated on a target and guiding a flying object, and transmitting the laser beam in a pulse shape based on a predetermined reference time And a light receiving means for receiving the detected light in the flying object, the light receiving means being controlled in operation based on a reference time common to the light transmitting means and corresponding to the laser light transmission timing of the light transmitting means. A flying body laser guiding device characterized in that it is means for intermittently detecting the signal of the detected light.   An optical receiver that receives the detected light, a gate circuit that intermittently generates a gate signal based on a reference time, and an optical receiver circuit that is acquired while the gate signal of the gate circuit is generated 2. The flying body laser guiding apparatus according to claim 1, further comprising: a signal processing circuit that integrates the received signal and obtains a determination signal of the detected light by determining a threshold value of the integrated value.   The light transmitting means is means for transmitting laser light in an irregular pattern, and the light receiving means is means for performing signal detection of detected light in the same pattern as the transmission pattern of the light transmitting means. The laser guidance device for a projectile according to claim 1 or 2.   4. The flying body laser guiding apparatus according to claim 1, wherein the light transmitting means and the light receiving means include a radio wave receiving circuit for using a transmission signal of the artificial satellite as a reference time. .

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