DE102013021454A1 - Method and device for monitoring an environment of a traffic monitoring system - Google Patents

Abstract

The invention relates to a method for providing signals (222, 224) for monitoring an environment for a traffic monitoring system. The method comprises a step of providing a first transmit signal (222), wherein the first transmit signal (222) is determined using a first modulation method, and a step of providing a second transmit signal (224) in response to a criterion, the second transmit signal (222) 224) is determined using a second modulation method, wherein the first modulation method and the second modulation method are different from each other.

Description

State of the art

The present invention relates to a method for providing signals for monitoring an environment for a traffic monitoring system, a corresponding device for providing signals for monitoring an environment for a traffic monitoring system, to a method for monitoring an environment of a traffic monitoring system, to a corresponding device for Monitoring an environment of a traffic monitoring system and a corresponding computer program product.

Doppler radar systems are among the main measuring instruments for monitoring and enforcing legal speed limits for vehicles. In traffic monitoring, as well as in other fields of application different modulation methods are used. CW and FSK radars are most commonly used in traffic monitoring because they allow direct speed monitoring. In modern traffic radars, the FSK method is used to determine in addition to the speed and the distance of a moving vehicle can. Corresponding variants of a method and a device for evidently detecting the speed of a vehicle are described, for example, in the disclosures DE 10339954 A1 and DE 10 2007 022 373 A1 presented.

In other applications, FMCW or FMSK modulation methods are often used, since in many applications it is critical to detect objects at rest. Corresponding variants are in the disclosure DE 10349919 A1 by means of a measuring device for a motor vehicle and in the patent specification DE 10050278 B4 describe a method and apparatus for determining distance and relative velocity of a remote object.

Here, a fixed modulation type is used in particular. The tracking radar uses the position information, consisting of distance (from the modulation mode) and angle, as well as the speed to observe objects over time.

Disclosure of the invention

Against this background, the present invention provides a method for providing signals for monitoring an environment for a traffic monitoring system, a corresponding device for providing signals for monitoring an environment for a traffic monitoring system, a method for monitoring an environment of a traffic monitoring system, a device for monitoring an environment of a traffic monitoring system and a corresponding computer program product, which uses at least one of the two methods, presented according to the main claims. Advantageous embodiments emerge from the respective subclaims and the following description.

In traffic monitoring, radar systems are used for speed monitoring, distance measurement or in part to detect red light violations.

If a traffic violation is detected during traffic monitoring, evidence is taken by means of a camera. This is done for example in the speed monitoring in that the speed with a limit speed, z. B. a maximum permissible speed, and a proof taken by a camera, if the speed is greater than the limit speed.

Such a radar system may be a so-called tracking radar. In order to compensate the technical or algorithm-related disadvantages of the modulation methods used, it is advantageous to use or combine at least two different modulation methods. Thus, disadvantages of a modulation method can be compensated efficiently by the use of a further modulation method. Thus, traffic monitoring can take advantage of at least two different modulation schemes.

A method is presented for providing signals for monitoring an environment for a traffic monitoring system, the method comprising the steps of:
Providing a first transmit signal, wherein the first transmit signal is determined using a first modulation method; and
Providing a second transmit signal in response to a criterion, wherein the second transmit signal is determined using a second modulation method, wherein the first modulation method and the second modulation method are different from each other.

Traffic monitoring systems also serve to enforce rules and laws in road traffic. A traffic monitoring system can measure the speed and distance serve. The distance measurement can be used for position determination. A modulation can be understood to mean a change of a carrier signal by a useful signal. The modulation method may be a digital modulation method, in particular a digital angle modulation method or a frequency and / or phase modulation. The criterion can map an event. The event may be independent of the transmit signals or dependent on at least one of the transmit signals or a signal based on at least one of the transmit signals.

The criterion may be, for example, an expiration of a time interval. Thus, after a time interval or after a period of time, the modulation method can be changed and, for example, be switched from the first transmission signal to the second transmission signal. Furthermore, it is possible to switch from the second transmission signal to the first transmission signal after a time interval or after a period of time has elapsed. Thus, the two transmission signals, that is to say the first transmission signal and the second transmission signal, can be provided alternately. A time period of providing the first transmission signal may differ from a period of providing the second transmission signal, or alternatively may be the same. This is technically particularly easy to implement and offers the advantages of two different modulation methods.

It is also favorable if the criterion is created in response to a signal parameter of the first response signal and additionally or alternatively to a signal derived from the first response signal. The criterion may be established in response to falling below a threshold by the first response signal to the first transmission signal. Alternatively, the criterion can be created if the first response signal does not exceed or fall below an envelope.

In the step of providing the second transmission signal, the modulation method may be selected in response to a signal parameter of the first response signal and additionally or alternatively a signal derived from the first response signal. Thus, depending on the situation, the second modulation method can be varied. Thus, in response to a situation to compensate for disadvantages of the first modulation method in this situation, a correspondingly favorable second modulation method can be selected. In a further step, a third transmission signal can also be provided, wherein the third transmission signal is determined using a third modulation method.

The first transmit signal may be determined using a periodically sinusoidal carrier signal. The first transmit signal may be determined using a substantially rectangular data signal. The second transmit signal may be determined using a periodically sinusoidal carrier signal. Furthermore, the second transmission signal can be determined using a substantially triangular or sawtooth-shaped data signal. The transmit signals can each be generated by modulation of the carrier signal with the data signal.

Furthermore, the first modulation method may be based on an FSK modulation method or alternatively on a CW modulation method. The second modulation method may be based on an FMSK modulation method or alternatively on an FMCW modulation method. In this case, a CW modulation method can be understood as a continuous wave modulation. CW can stand as an abbreviation for "Continuous Wave". FSK can stand for Frequency Shift Keying or Frequency Shift Keying.

A method for monitoring an environment of a traffic monitoring system comprises the following steps:
Reading in a first response signal of a first signal, the first signal representing a first transmit signal generated using a first modulation method;
Reading in a second response signal of a second signal, the second signal representing a second transmit signal generated using a second modulation method, wherein the first modulation method and the second modulation method differ; and
Evaluating the first response signal and additionally or alternatively the second response signal to monitor the environment of the traffic monitoring system, in particular to determine a distance and additionally or alternatively a relative speed between at least one object and a measurement location.

In the evaluating step, the second response signal may be evaluated using the first response signal. Further, in the step of evaluating, the second response signal may be evaluated using a signal derived from the first response signal. On the basis of a known history, for example from the step of evaluating the first response signal, monitoring of the environment can be simplified.

In an embodiment, the method for monitoring an environment of a traffic monitoring system comprises the steps of A method of providing signals for monitoring an environment for a traffic monitoring system. Thus, in one method, the steps of providing a first transmit signal and a second transmit signal may be combined with the steps of evaluating the first response signal and the second response signal. In this case, in the step of the evaluation, a simple relationship between the different signals can be established. Thus, for example, a phase shift and a frequency shift or a modulation between the first transmission signal and the first response signal or between the second transmission signal and the second response signal can be created. Thus, the first transmission signal and the first response signal or the second transmission signal and the second response signal can be synchronized in time.

An apparatus for providing signals for monitoring an environment for a traffic monitoring system has the following features:
an interface for providing a first transmit signal, wherein the first transmit signal is determined using a first modulation method; and
an interface for providing a second transmission signal in response to a criterion, wherein the second transmission signal is determined using a second modulation method, wherein the first modulation method and the second modulation method are different from each other.

An apparatus for monitoring an environment of a traffic monitoring system has the following features:
an interface for reading in a first response signal of a first signal, the first signal representing a first transmit signal generated using a first modulation method;
an interface for reading in a second response signal of a second signal, the second signal representing a second transmit signal generated using a second modulation method, wherein the first modulation method and the second modulation method differ; and
a device for evaluating the first response signal and additionally or alternatively the second response signal to monitor the environment of the traffic monitoring system, in particular to determine a distance and additionally or alternatively a relative speed between at least one object and a measurement location.

In one embodiment, the device for monitoring an environment of a traffic monitoring system comprises the interfaces and, additionally or alternatively, the devices of the device for providing signals for monitoring an environment for a traffic monitoring system.

The device for monitoring an environment of a traffic monitoring system is designed to implement or implement the steps of a variant of a method presented here for monitoring an environment of a traffic monitoring system in corresponding devices. The device for providing signals for monitoring an environment for a traffic monitoring system is designed to implement or implement the steps of a variant of a method presented here for providing signals for monitoring an environment for a traffic monitoring system in corresponding devices. Also by this embodiment of the invention in the form of a device, the object underlying the invention can be solved quickly and efficiently.

In the present case, a device can be understood as meaning an electrical device which processes sensor signals and outputs control and / or data signals in dependence thereon. The device may have an interface, which may be formed in hardware and / or software. In the case of a hardware-based embodiment, the interfaces can be part of a so-called system ASIC, for example, which contains a wide variety of functions of the device. However, it is also possible that the interfaces are their own integrated circuits or at least partially consist of discrete components. In a software training, the interfaces may be software modules that are present, for example, on a microcontroller in addition to other software modules.

All embodiments of the traffic monitoring device according to the invention can have a camera in order to record a proof thereof by means of this if a traffic violation is detected during the traffic monitoring.

The traffic monitoring system is preferably designed to monitor the environment in a surveillance area.

A computer program product with program code which can be stored on a machine-readable carrier such as a semiconductor memory, a hard disk memory or an optical memory and is used to carry out the method according to one of the embodiments described above if the program product is installed on a computer or a device is also of advantage is performed.

The invention will now be described by way of example with reference to the accompanying drawings. Show it:

1 a traffic monitoring system according to an embodiment of the present invention;

2 a block diagram of an apparatus for providing signals for monitoring an environment for a traffic monitoring system according to an embodiment of the present invention;

3 a block diagram of a device for providing signals according to an embodiment of the present invention;

4 a block diagram of an apparatus for monitoring an environment for a traffic monitoring system according to an embodiment of the present invention;

5 a block diagram of a device for monitoring according to an embodiment of the present invention;

6 a block diagram of a traffic monitoring system according to an embodiment of the present invention;

7 a flowchart of a method according to an embodiment of the present invention;

8th a flowchart of a method according to an embodiment of the present invention; and

9 a flowchart of a method according to an embodiment of the present invention.

In the following description of favorable embodiments of the present invention, the same or similar reference numerals are used for the elements shown in the various figures and similar acting, with a repeated description of these elements is omitted.

1 shows a traffic monitoring system 100 according to an embodiment of the present invention. The traffic monitoring system 100 is, for example, as a device equipped with a weatherproof housing, next to a road 102 arranged. The traffic monitoring system 100 is designed to be an environment of the traffic monitoring system 100 to monitor, or the environment in a surveillance area 104 to monitor. In 1 Two dashed lines span the surveillance area 104 on. It goes the surveillance area 104 from the traffic monitoring system 100 out. From the traffic monitoring system 100 are on the street 102 in the surveillance area 104 three objects 106 detectable. At the objects 106 they are vehicles 106 , each one speed 108 exhibit. The speed 108 is in 1 by corresponding vectors within the vehicles 106 shown. Because the traffic monitoring system 100 is arranged immovable on the roadside, the speed is equal 108 the relative speed 108 between the traffic monitoring system 100 and the vehicle 106 ,

From the position of the traffic monitoring system 100 and the current position of the respective vehicle 106 there is a gap 110 between the traffic monitoring system 100 and the vehicle 106 , From the traffic monitoring system 100 goes a wave-beam based signal 112 from, in particular a radar signal 112 , At least part of the signal 112 gets from the objects 106 reflected and can by the traffic monitoring system 100 be received and evaluated to the speed 108 or the distance 110 between an object 106 and the traffic monitoring system 100 to determine. The signal can be on one of the basis of 2 based transmission signals described.

In an embodiment not shown, the traffic monitoring system 100 above the road, for example in a gantry, in another embodiment, not shown, the traffic monitoring system between two lanes, for example, in a crossing center, arranged.

Speed and red light violations cause the highest hazard potential in road traffic. For this reason, these types of traffic violations are mainly monitored. For this purpose, invasive and non-invasive sensor systems can be used. Due to the high installation costs of invasive sensors, non-invasive sensor technology is increasingly prevalent. Due to their compactness and reliability, wave-beam-based sensors with transmitting and receiving units have prevailed here. Due to their robustness and weather independence mainly radar sensors are used. Such a radar sensor may, in one embodiment, be in the traffic monitoring system 100 be integrated.

In traffic monitoring, continuous wave (CW) radar sensors are fixed Abstrahlcharakteristik used. Without modulation, only a signed speed can be achieved 108 of moving objects 106 be determined. To escape this limitation, various fixed modulation types are used, each with certain advantages and disadvantages. FSK (FSK: Frequency Shift Keying) can be used in addition to speed 108 the distance 110 or the distance 110 moving objects 106 determine. With L-FMCW can only the distance 110 to stationary objects 106 be determined safely. With FMCW (FMCW: "Frequency Modulated Continuous Wave Radar) can be used both on moving objects 106 as well as standing objects 106 the distance 110 and speed 108 be determined safely. This has the disadvantage that there are a lot of compute-intensive complex background information to be compensated. FMSK delivers comparable results as an FMCW, but the waveform is more complex to generate. In the monitoring of speed and red light violations in traffic results from the advantages and disadvantages of each singular modulation modes disadvantages in certain constellations.

2 shows a block diagram of a device 220 for providing signals 222 . 224 for monitoring an environment for a traffic monitoring system according to an embodiment of the present invention. The traffic monitoring system may be an embodiment of the in 1 shown traffic monitoring system 100 act. The device 220 has an interface 226 for providing a first transmission signal 222 as well as an interface 228 for providing a second transmission signal 224 on. In this case, the first transmission signal 222 determined using a first modulation method. The second transmission signal 224 is determined using a second modulation method. In this case, the first and the second modulation method differ from each other.

3 shows a block diagram of a device 220 for providing signals 222 . 224 according to an embodiment of the present invention. In the device 220 it may be an embodiment of in 2 shown device 220 for providing signals 222 . 224 act. Unlike the in 2 embodiment shown, the device 220 a single interface 226 . 228 for providing a first transmission signal 222 and a second transmission signal 224 on, wherein at a time only one of the two transmission signals 222 . 224 provided. The change between providing the first transmission signal 222 and providing the second transmit signal 224 takes place in response to a criterion 330 , This is the criterion 330 in one embodiment, a periodic trigger signal 330 which always after a lapse of a predefined time interval a change between the provision of the first transmission signal 222 and providing the second transmit signal 224 displays.

In another embodiment, the criterion becomes 330 created in response to a signal parameter of a first response signal or a signal parameter of a signal derived from the first response signal.

In yet another embodiment, the criterion 330 In this case, the first response signal is a signal which represents a signal detected by a sensor, wherein the detected signal is a reflection of the first transmission signal 222 is.

As already under 2 described, be the first transmission signal 222 and the second transmission signal 224 generated by two mutually different modulation methods. In one embodiment, the interface 228 configured to provide the second transmit signal to select the modulation method for the second transmit signal in response to a signal parameter of a first response signal or a signal derived from the first response signal. Thus, the modulation method used for the transmission signal can be adjusted depending on the situation.

In one embodiment, both the first transmit signal 222 as well as the second transmission signal 224 generated using a periodically sinusoidal carrier signal. So can for the first transmission signal 222 the periodically sinusoidal carrier signal is modulated with a substantially rectangular data signal. The second transmission signal 224 can be determined by a modulation of the periodically sinusoidal carrier signal and a substantially triangular or sawtooth-shaped data signal.

As a modulation method is in an embodiment for the first transmission signal 222 a FSK modulation and for the second transmission signal 224 used an FMSK modulation.

Each modulation type has advantages and disadvantages. Advantageously, disadvantages of one can be compensated by the other by the use of two different modulation methods. With the frequently used FSK modulation method, only objects with different radial velocities can be resolved. This means that vehicles with exactly the same radial speed are not considered separate objects be perceived. Due to this property, a simple suppression of the background (resting objects) is possible, since they all have the same velocity (v = 0). Therefore, they can be filtered out with simple filters. However, no dormant vehicles are thus recognizable. In situations where very many objects with very similar or identical speeds are within the field of view of the radar, for example at large intersections, not all objects can be reliably separated from each other when FSK modulation is used exclusively. This has a negative effect on the performance of the measuring system. Even in red light applications at traffic lights, there are many stationary objects in the field of vision of the radar. Through the history, a tracking algorithm can remember at which position a moving object was last detected. From the last known position for an object conclusions can be drawn on the position of the object, even when it is at rest. However, this is only an estimate and thus fraught with uncertainties.

The FMSK or FMCW modulation method offers a possibility of object separation both due to the speed and due to the distance. Thus, objects having an equal radial velocity can be separated from each other. This means that even stationary objects are separable, so that even stationary vehicles can be detected. However, the environmental information can not be filtered out so easily, because even stationary objects cause a response signal in the form of a phase or frequency shift, so that the overall computational effort increases. Compared to the signal processing in the FSK modulation method, no direct velocity measurement from the Doppler frequency shift is possible, but it is always a system of equations of relative speed and distance must be solved. The combination of the FSK modulation method with the FMSK modulation method allows a resolution of distance and speed with a total of acceptable computational effort.

4 shows a block diagram of a device 440 for monitoring an environment for a traffic monitoring system according to an embodiment of the present invention. The traffic monitoring system may be the one in 1 described traffic monitoring system 100 act. The device 440 includes an interface 442 for reading a first response signal 444 a first signal, an interface 446 for reading a second response signal 448 a second signal and a device 450 for evaluating the first response signal 444 and the second response signal 448 , The first signal represents a first transmit signal generated using a first modulation method, the second signal represents a second transmit signal generated using a second modulation method. In this case, the first and the second modulation method differ from each other. The device 450 for evaluation is formed, the first response signal 444 , the second response signal 448 or both response signals 444 . 448 to monitor the environment of the traffic monitoring system. In particular, the device 450 designed for evaluating to determine a distance and a relative speed between an object or a plurality of objects and a measuring location or a position of the traffic monitoring system.

In one embodiment, the device is 450 designed to evaluate, the second response signal 448 using the first response signal 444 or one of the first response signal 444 evaluate derived signal.

5 shows a block diagram of a device 440 for monitoring an environment for a traffic monitoring system according to an embodiment of the present invention. The device 440 corresponds to the in 4 shown device 440 with the difference that the device 440 interfaces 226 . 228 a variant of in 2 and 3 shown device 220 for providing signals 222 . 224 for monitoring an environment of the traffic monitoring system. The device includes an interface 226 for providing a first transmission signal 222 , an interface 228 for providing a second transmission signal, an interface 442 for reading a first response signal 444 , an interface 446 for reading a second response signal and a device 450 for evaluating the response signals.

Because the first transmission signal 222 and the second transmission signal 224 are not output in parallel at the same time, in an embodiment not shown are the two interfaces 226 . 228 summarized for providing in an interface. The situation is similar in the area of the interface 442 . 446 for reading, so that in an embodiment, not shown, the two interfaces 442 . 446 for reading in an interface 442 . 446 are summarized.

In one embodiment, the device 440 for monitoring a control device 560 on. In this case, a phase locked loop (PLL) and a parameter memory can be part of the control device 560 be. In this case, at least one parameter set is available in the parameter memory for each of the modulation methods used stored in response to the criterion to the phase locked loop to create a signal which is output via the interface for providing as a transmission signal.

6 shows a block diagram of a traffic monitoring system 100 according to an embodiment of the present invention. In the traffic monitoring system 100 it may be an embodiment of an in 1 shown traffic monitoring system 100 act. The traffic monitoring system includes a device 440 to monitor, as this example in 4 and 5 is described with reference to embodiments, a control device 560 as well as a sensor 670 , At the sensor 670 it can be a radar sensor 670 act. the interface 226 . 228 for providing as well as the interface 442 . 446 to read in with the radar sensor 670 connected. The radar sensor 670 is trained to do that by the interface 226 . 228 for providing provided transmission signal 222 . 224 read in and a radar signal 112 issue. It is sequentially alternating from the interface 226 . 228 the first transmission signal 222 and the second transmission signal 224 provided. The radar sensor 670 is formed, a transmission signal 222 . 224 in a radar signal 112 to convert and send this, for example using an antenna. A radar signal reflected from an object 672 is from the radar sensor 670 , for example, using one or more antennas, received in a first response signal 444 or a second response signal 448 converted and the interface 442 . 446 provided for reading. The first response signal 444 This forms from the first transmission signal 222 resulting reflected radar signal 672 and the second response signal 444 this forms from the second transmission signal 224 resulting reflected radar signal 672 from. In a variant of this embodiment with three antennas, not shown, the transmission signals 222 and 224 sent out via an antenna. A radar signal reflected from an object 672 is from the radar sensor 670 received using two antennas. Both antennas either receive a first response signal 444 or a second response signal 448 , The first response signal 444 This forms from the first transmission signal 222 resulting reflected radar signal 672 and the second response signal 444 this forms from the second transmission signal 224 resulting reflected radar signal 672 from. By receiving with two antennas runtime differences in response signals 444 . 448 be determined and used for position determination.

In one embodiment, the traffic monitoring system is 100 arranged in a weatherproof housing. The housing may have recesses through which the radar beams 112 and reflected radar beams 672 can penetrate. Furthermore, in front of the radar sensor 670 an optic can be arranged.

In applications in which many stationary vehicles are in the field of view of the radar, both stationary and moving objects should be detected and measured. By adaptive switching between modulation behavior or modulation method, the sensor turns 670 of the traffic monitoring system 100 optimally on the scenery and has the advantage of using the more favorable modulation method. As a result, the performance of a tracking radar can be improved, in particular in situations with high traffic density. Due to the possibility of recognizing stationary targets, it is possible to use them in new fields of application in which a stationary vehicle commits a traffic violation. As a result, for example, a combined red light / speed and yellow box application can be realized. By switching from the FSK modulation method to the FMSK modulation method, stationary targets, which are considered reflectors for multipath propagation (kink beam), can be detected and located. Based on this environmental knowledge, some kinks, especially in situations with many standing reflectors, can be more easily detected and filtered out.

With the help of modern frequency synthesis circuits, a fast switching between different frequencies is possible with simultaneously high frequency stability and frequency accuracy. For this PLL control loops are used. This makes it possible to generate a high-precision frequency generation over a wide frequency range and thus realize the FMSK modulation method. To benefit simultaneously from the advantages of simple background suppression and direct velocity measurement, FSK and FMSK modulation techniques are used alternately (adaptive frequency modulation). The sensor 670 Then, depending on the situation, for example in situations with ever slower moving vehicles, adaptively switch the modulation method. For this purpose, the control values for the PLL for the respective modulation method are, for example, firmly defined and stored. If the measuring algorithm recognizes a situation in which the objects are moving ever slower during FSK operation, the measuring algorithm can easily switch over to FMSK operation and thus adjust to the changed traffic situation. Switching may also be due to other indicators that require recognition of standing targets.

Due to the known history, the target recognition in FMSK operation is simplified.

Since a vehicle that commits a traffic violation must have moved before or while committing the traffic inaccuracy, the traffic inability can be determined using the FSK modulation method. The location of the vehicle can thus be determined. Switching to the FMSK modulation method at low speeds all the way to standstill, the background suppression as well as the target recognition can be significantly simplified because the speed and position of the interesting objects (vehicles) are already known due to the information from the FSK modulation method.

In addition to the adaptive switching between the two modulation methods, the switching can also take place in fixed time frames.

An advantage of the described inventive idea is recognition of standing targets and thus improved performance in situations with many slow or dormant objects. In this case, a primary measurement value of the speed takes place by the known FSK method. This is complemented by an adaptive adaptation of the modulation mode to achieve the optimal performance of the system 100 in a traffic situation. Of advantage is the simplification of the target recognition compared to using only the FMSK modulation method.

7 shows a flowchart of a method 780 for providing signals for monitoring an environment for a traffic monitoring system according to an embodiment of the present invention. The traffic monitoring system may be an embodiment of an in 1 or 6 described traffic surveillance system 100 act. The procedure 780 includes a step 782 the provision of a first transmission signal and a step 784 the provision of a second transmission signal. The first transmission signal is determined using a first modulation method, the second transmission signal is determined using a second modulation method different from the first modulation method.

8th shows a flowchart of a method 890 for monitoring an environment for a traffic monitoring system according to an embodiment of the present invention. The traffic monitoring system may be an embodiment of an in 1 or 6 described traffic surveillance system 100 act. The procedure 890 includes a step 892 the reading of a first response signal, a step 894 reading in a second response signal and a step 896 the evaluation of the first response signal and additionally or alternatively the second response signal. In step 896 the execution of the environment of the traffic monitoring system is monitored. In particular, in step 896 the evaluation of a distance and additionally or alternatively determines a relative speed between an object and a measurement location of the traffic monitoring system.

9 shows a flowchart of a method 890 for monitoring an environment for a traffic monitoring system according to an embodiment of the present invention. The traffic monitoring system may be an embodiment of an in 1 or 6 described traffic surveillance system 100 act. The procedure 890 includes a step 782 the provision of a first transmission signal, a step 892 the reading of a first response signal, a step 896 evaluating the first response signal, a step 784 the provision of a second transmission signal, a step 894 reading in a second response signal and a step 896 the evaluation of the second response signal. So are in the in 9 shown embodiment of the method 890 to monitor an environment for a traffic surveillance system, unlike the one in 8th embodiment shown, the steps of in 7 shown method for providing signals for monitoring an environment for a traffic monitoring system with integrated.

The embodiments described and shown in the figures are chosen only by way of example. Different embodiments may be combined together or in relation to individual features. Also, an embodiment can be supplemented by features of another embodiment.

Furthermore, method steps according to the invention can be repeated as well as carried out in a sequence other than that described.

If an exemplary embodiment comprises a "and / or" link between a first feature and a second feature, then this is to be read so that the embodiment according to one embodiment, both the first feature and the second feature and according to another embodiment either only first feature or only the second feature.

LIST OF REFERENCE NUMBERS

100

Traffic monitoring system

102

Street

104

monitoring area

106

Object, vehicle

108

Speed, relative speed

110

Distance, distance

112

Signal, radar signal

220

contraption

222

first transmission signal

224

second transmission signal

226

Interface for providing

228

Interface for providing

330

criteria

440

contraption

442

Interface for reading

444

first response signal

446

Interface for reading

448

second response signal

450

Device for evaluation

560

control device

670

Sensor, radar sensor

672

reflected radar signal

780

method

782

Step of providing

784

Step of providing

890

method

892

Step of reading in

894

Step of reading in

896

Step of the evaluation

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10339954 A1 [0002]
• DE 102007022373 A1 [0002]
• DE 10349919 A1 [0003]
• DE 10050278 B4 [0003]

Claims (13)

Procedure ( 780 ) for providing signals ( 222 . 224 ) for monitoring an environment for a traffic surveillance system ( 100 ), the process ( 780 ) comprises the following steps: providing ( 782 ) of a first transmission signal ( 222 ), wherein the first transmission signal ( 222 ) is determined using a first modulation method; and deploy ( 784 ) of a second transmission signal ( 224 ) in response to a criterion ( 330 ), wherein the second transmission signal ( 224 ) is determined using a second modulation method, wherein the first modulation method and the second modulation method are different from each other. Procedure ( 780 ) according to claim 1, wherein the criterion ( 330 ) is a lapse of a time interval. Procedure ( 780 ) according to one of the preceding claims, wherein the criterion ( 330 ) in response to a signal parameter of a first response signal ( 444 ) and / or one of the first response signal ( 444 ) derived signal and / or falls below a threshold by the first response signal ( 444 ) to the first transmission signal ( 222 ). Procedure ( 780 ) according to one of the preceding claims, wherein in step ( 784 ) of providing the second transmission signal ( 224 ) the modulation method in response to a signal parameter of the first response signal ( 444 ) and / or one of the first response signal ( 444 ) derived signal is selected. Procedure ( 780 ) according to one of the preceding claims, wherein the first transmission signal ( 222 ) is determined using a periodically sinusoidal carrier signal and a substantially rectangular data signal and / or the second transmission signal ( 224 ) is determined using a periodically sinusoidal carrier signal and a substantially triangular data signal. Procedure ( 780 ) according to one of the preceding claims, wherein the first modulation method is based on an FSK modulation method or on a CW modulation method and / or the second modulation method is based on an FMSK modulation method or on an FMCW modulation method. Procedure ( 890 ) for monitoring an environment of a traffic surveillance system ( 100 ), the process ( 890 ) has the following steps: reading in ( 892 ) of a first response signal ( 444 ) of a first signal, wherein the first signal generates a first transmission signal (14) generated using a first modulation method ( 222 represents; Read in ( 894 ) of a second response signal ( 448 ) of a second signal, the second signal generating a second transmission signal (14) using a second modulation method ( 224 ), wherein the first modulation method and the second modulation method differ; and evaluation ( 896 ) of the first response signal ( 444 ) and / or the second response signal ( 448 ) to the environment of the traffic monitoring system ( 100 ), in particular by a distance ( 110 ) and / or a relative speed ( 108 ) between at least one object ( 106 ) and a measuring location. Procedure ( 890 ) according to claim 7, wherein in the step ( 896 ) evaluating the second response signal ( 448 ) using the first response signal ( 444 ) and / or one of the first response signal ( 444 ) derived signal is evaluated. Procedure ( 890 ) according to one of claims 7 to 8, wherein the method ( 890 ) the steps of the procedure ( 780 ) for providing signals ( 222 . 224 ) for monitoring an environment for a traffic surveillance system ( 100 ) according to one of claims 1 to 6. Contraption ( 220 ) for providing signals ( 222 . 224 ) for monitoring an environment for a traffic surveillance system ( 100 ), the device ( 220 ) has the following features: an interface ( 226 ) for providing a first transmission signal ( 222 ), wherein the first transmission signal ( 222 ) is determined using a first modulation method; and an interface ( 228 ) for providing a second transmission signal ( 224 ) in response to a criterion ( 330 ), wherein the second transmission signal ( 224 ) is determined using a second modulation method, wherein the first modulation method and the second modulation method are different from each other. Contraption ( 440 ) for monitoring an environment of a traffic surveillance system ( 100 ), the device ( 440 ) has the following features: an interface ( 442 ) for reading in a first response signal ( 444 ) of a first signal, wherein the first signal generates a first transmission signal (14) generated using a first modulation method ( 222 represents; an interface ( 446 ) for reading in a second response signal ( 448 ) of a second signal, the second signal using a second modulation signal generated second transmission signal ( 224 ), wherein the first modulation method and the second modulation method differ; and a facility ( 450 ) for evaluating the first response signal ( 444 ) and / or the second response signal ( 448 ) to the environment of the traffic monitoring system ( 100 ), in particular by a distance ( 110 ) and / or a relative speed ( 108 ) between at least one object ( 106 ) and a measuring location. Contraption ( 440 ) according to claim 11, wherein the device ( 440 ) the interfaces ( 226 . 228 ) and / or the devices of the device ( 220 ) for providing signals for monitoring an environment for a traffic monitoring system ( 100 ) according to claim 10. Computer program product with program code for carrying out the method ( 780 ) according to one of claims 1 to 6 and / or for carrying out the method ( 890 ) according to one of claims 7 to 9, when the program product is executed on a device.

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