EP4248233A1 - Empfangssignal-verarbeitungseinrichtung einer detektionsvorrichtung zur überwachung wenigstens eines überwachungsbereichs, detektionsvorrichtung und verfahren zum betreiben einer detektionsvorrichtung - Google Patents
Empfangssignal-verarbeitungseinrichtung einer detektionsvorrichtung zur überwachung wenigstens eines überwachungsbereichs, detektionsvorrichtung und verfahren zum betreiben einer detektionsvorrichtungInfo
- Publication number
- EP4248233A1 EP4248233A1 EP21815970.5A EP21815970A EP4248233A1 EP 4248233 A1 EP4248233 A1 EP 4248233A1 EP 21815970 A EP21815970 A EP 21815970A EP 4248233 A1 EP4248233 A1 EP 4248233A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency
- received signal
- signal processing
- ffi
- processing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 238000012544 monitoring process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000004458 analytical method Methods 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims description 54
- 238000010606 normalization Methods 0.000 claims description 15
- 238000011156 evaluation Methods 0.000 claims description 12
- 230000003321 amplification Effects 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 238000002372 labelling Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 241001465754 Metazoa Species 0.000 description 2
- 230000035559 beat frequency Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
- G01S7/354—Extracting wanted echo-signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/491—Details of non-pulse systems
- G01S7/4912—Receivers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/491—Details of non-pulse systems
- G01S7/493—Extracting wanted echo signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/93—Lidar systems specially adapted for specific applications for anti-collision purposes
- G01S17/931—Lidar systems specially adapted for specific applications for anti-collision purposes of land vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
- G01S2013/9323—Alternative operation using light waves
Definitions
- the invention relates to a received signal processing device of a detection device for monitoring at least one monitored area for objects using electromagnetic scanning signals, the received signal processing device having at least one frequency analysis means for frequency analysis of electromagnetic received signals which are determined from echo signals of electromagnetic scanning signals reflected in at least one monitored area.
- the invention relates to a detection device for monitoring at least one monitoring area for objects using electromagnetic scanning signals, with at least one transmission device with which electromagnetic scanning signals can be generated from electrical transmission signals, which can be sent into at least one monitoring area, with at least one receiving device with which electrical received signals can be determined from echo signals of electromagnetic scanning signals reflected in at least one monitoring area, and with at least one control and evaluation device which has at least one frequency analysis means for frequency analysis of the electrical received signals.
- the invention also relates to a method for operating a detection device for monitoring at least one monitoring area for objects, in which electromagnetic scanning signals are generated from electrical transmission signals and sent into at least one monitoring area, electrical reception signals are determined from echo signals of electromagnetic scanning signals reflected in at least one monitoring area, at least one frequency analysis is carried out on the received electrical signals and information about the at least one monitoring area is determined on the basis of at least one frequency analysis.
- a high-resolution LIDAR system is known from US 2019/0370614 A1.
- a laser source emits a carrier wave which is amplitude modulated, frequency modulated, phase modulated, or a combination modulated in the modulator to produce a pulse having a bandwidth and a duration.
- a splitter splits the chirp into a transmit beam with most of the beam's energy and a reference beam with a much lower amount of energy, but sufficient to produce good heterodyne or homodyne interference with the taillight scattered by a target. Multiple parts of the target scatter a respective returned light signal back to the detector array for each ray scanned, resulting in a point cloud based on the multiple distances of the respective multiple parts of the target illuminated by multiple rays and multiple returns.
- a dechirp mixer compares a detected signal with the original chirp waveform output from the power divider and operational amplifier to produce an electrical signal with the beat frequency that depends on the frequency difference between the RF reference waveform and the detected waveform.
- Another op amp and FFT process is used to find the beat frequency.
- the invention is based on the object of designing a received signal processing device, a detection device and a method of the type mentioned at the outset, in which a frequency analysis of the electrical received signals can be implemented more easily.
- this object is achieved in the received signal processing device in that the received signal processing device has a plurality of functionally parallel frequency filters with at least partially different frequency passbands and at least one frequency filter has at least one frequency identifier with which the at least one frequency filter let through Transmission reception signal can be marked with a frequency characteristic which characterizes the frequency passband of the at least one passing frequency filter.
- a plurality of frequency filters with different frequency passbands are provided, with which the received electrical signals are analyzed with regard to their frequency.
- At least one frequency filter has a frequency identification means, with which the received signal passed through this at least one frequency filter is provided with a corresponding frequency characteristic.
- the individual frequency feature characterizes the corresponding at least one frequency filter.
- the transmission reception signal can be assigned to the at least one frequency filter through which it is transmitted, and thus to its frequency transmission range. In this way, the frequencies from which the corresponding received signal is composed can be analyzed. No prior transformation in the usual sense is required for this, which requires complex components and a comparatively large amount of energy, particularly in the case of multi-channel systems.
- a frequency analysis of the electrical received signals can also be carried out for multi-channel systems using simple components.
- Frequency filters with frequency identifiers can be easily designed and implemented.
- an energy-efficient frequency analysis can be carried out in this way.
- received signal processing devices according to the invention can be implemented in a space-saving manner.
- the frequency passband of a frequency filter is the frequency range between a lower limit frequency and an upper limit frequency.
- the cut-off frequencies characterize the respective frequency filter.
- the frequency ranges of the frequency passbands can be specified so that a desired distance resolution at a desired Range of the detection device can be realized in connection with the frequency response of the scanning signals.
- electromagnetic scanning signals in the form of frequency-modulated continuous wave signals can be used with the at least one detection device.
- distances from objects can be determined on the basis of frequency shifts between scanning signals and scanning signals reflected as echo signals.
- frequency-modulated continuous-wave signals signal sequences can be transmitted continuously, in particular in the form of chirps.
- the electrical transmission signals from which the electromagnetic scanning signals are generated, in particular with the aid of a transmission device can be frequency-modulated continuous-wave signals.
- the electromagnetic scanning signals can be light signals, radar signals or the like.
- the detection device in particular a transmission device of the detection device, can have at least one light source, in particular at least one laser, or at least one radar antenna, depending on the type of scanning signals.
- the detection device in particular a receiving device of the detection device, can have at least one light receiver or at least one radar antenna, depending on the type of scanning signals.
- Detectors designed for the wavelength of the transmitted scanning signals in particular point sensors, line sensors and/or area sensors, in particular (avalanche) photodiodes, photodiode lines, CCD sensors, active pixel sensors, in particular CMOS sensors, or the like, can be used as light receivers. be used.
- maxima in a frequency spectrum of the electrical received signals can be extracted from at least one frequency analysis.
- information about the at least one monitoring area in particular object information from objects in the at least one surveillance area can be determined.
- the information about the at least one monitoring area can be object information in the form of distances, speeds and/or directions of objects relative to the detection device, at which the scanning signals are reflected.
- the at least one detection device can advantageously be designed as a light detection and ranging system (LiDAR), laser detection and ranging system (LaDAR), radar system or the like. Such detection devices can be used to determine distances, speeds and/or directions of objects relative to the detection device.
- LiDAR light detection and ranging system
- Laser detection and ranging system LIDAR
- radar system or the like.
- detection devices can be used to determine distances, speeds and/or directions of objects relative to the detection device.
- the at least one detection device can advantageously be designed as a scanning system, in particular a scanning LiDAR system, or as a flash system, in particular flash LiDAR.
- a scanning system a monitoring area can be scanned, ie scanned, with scanning signals.
- a flash system corresponding scanning signals can illuminate a larger part of the surveillance area or the entire surveillance area at the same time.
- the invention can advantageously be used in vehicles, in particular motor vehicles.
- the invention can advantageously be used in land vehicles, in particular passenger cars, trucks, buses, motorcycles or the like, aircraft, in particular drones, and/or water vehicles.
- the invention can also be used in vehicles that can be operated autonomously or at least partially autonomously.
- the invention is not limited to vehicles. It can also be used in stationary operation, in robotics and/or in machines, in particular construction or transport machines such as cranes, excavators or the like.
- the detection device can advantageously be connected to at least one electronic control device of a vehicle or a machine, in particular a driver assistance system, or be part of one. In this way, at least some of the functions of the vehicle or machine can be operated autonomously or partially autonomously.
- the detection device can be used to detect stationary or moving objects, in particular vehicles, people, animals, plants, obstacles, bumps in the road, in particular potholes or stones, road boundaries, traffic signs, open spaces, in particular parking spaces, precipitation or the like.
- At least one frequency filter can be a bandpass filter.
- Bandpass filters can be designed with individual frequency passbands.
- At least one frequency filter in particular a bandpass filter, can advantageously be implemented as an oscillating circuit.
- Simple bandpass filters can be implemented with oscillating circuits.
- a resonant circuit is characterized by a lower limit frequency, an upper limit frequency and a resonant frequency which lies between the lower limit frequency and the upper limit frequency. In this way, the frequency passband of the resonant circuit can be characterized.
- bandpass filters with individual gains can be implemented.
- the individual gain of a bandpass filter can serve as a frequency identifier, with which a pass reception signal can be characterized in relation to the frequency passband of the bandpass filter.
- the frequency passbands of at least two frequency filters that are adjacent in terms of frequency can at least partially overlap and/or the frequency passbands of at least two frequency filters that are adjacent in terms of frequency cannot overlap.
- Mixtures of different frequency filters can also be resolved with at least partially overlapping frequency passbands.
- overlapping frequency passbands if received signals are allowed to pass through two frequency filters that are adjacent in terms of their frequency passbands, it can be assumed that the frequency of the pass-through received signal is in the overlapping range of the frequency passbands. The frequency of the transmission reception signal can thus be determined more precisely.
- the frequency passbands of the frequency filters can cover the maximum frequency amplitude of the received electrical signals overall. In this way, the received signals can be analyzed over the entire frequency amplitude range.
- At least two frequency filters can have frequency passbands with the same frequency range and/or at least two frequency filters can have frequency passbands with different frequency ranges. In this way, the received signal processing device can be adapted more flexibly to an application.
- Different frequency ranges can be used in order to adapt the resolution capability of the reception signal processing device to different distance ranges for objects in relation to the frequency analysis.
- a deterioration in the distance resolution which is caused by the distance of a reflecting object from the detection device, can be counteracted by appropriate adjustment of the frequency pass bands.
- At least one of the frequency filters can have an individually defined electrical amplification as a frequency identifier. This can be done with the defined electrical amplification passed pass-received signal based on the frequency filter are individually amplified. The individual degree of amplification of the pass-through received signal can form a frequency characteristic for the pass-through received signal, which characterizes the frequency passband of the corresponding passing frequency filter. In this way, the passed pass-received signal can be assigned via the electrical amplification to the corresponding frequency filter through which it was passed. Since each frequency filter has an individual frequency passband, the received signal can be assigned to the frequency passband and its frequency can be analyzed.
- each frequency filter can have an individually defined electrical gain as a frequency identifier. In this way, all frequency filters can be distinguished from one another.
- the received signal processing device can have at least one normalization means for normalizing received signals. In this way, dependencies of the amplitudes of the received signals on the distances of reflecting objects from the detection device can be compensated for.
- the received signals can be normalized with regard to their strength.
- At least one normalization means can have at least one amplifier stage.
- a gain stage allows the strength of a corresponding received signal to be subtracted directly from the strength of the corresponding passed received signal.
- At least one normalization means of the received signal processing device can have at least one operational amplifier which has one of its inputs connected to the outputs of the frequency filters and another of its inputs connected to the inputs of the frequency filters.
- Operational amplifiers can be implemented in a space-saving and energy-efficient manner. With an operational amplifier, the signal strength of the received signal present at the inputs of the frequency filter can differ from the signal strength of the signal at the outputs be subtracted from the pass-through reception signal present in the frequency filter.
- At least one resistor arrangement can be arranged between an input of at least one operational amplifier of a normalization means of the received signal processing device and in inputs of the frequency filters. In this way, a type of subtractor for the received signal and the transmission received signal can be implemented with the at least one operational amplifier.
- the received signal processing device can have at least one delay means which is directly or indirectly connected to the outputs of the frequency filters and/or which is directly or indirectly connected to at least one input of at least one normalization means of the received signal processing device.
- the pass-through reception signal passed can be slowed down.
- further processing of the at least one transmitted transmission reception signal can be carried out in a more energy-efficient manner.
- multiplexing and/or digitization with frequency bandwidths in high frequency ranges, in particular in the kilohertz range can be made possible in this way.
- the at least one delay means can advantageously have an integrating component.
- At least one delay means of the at least one received signal processing device can have at least one electrical capacitance.
- An integrating component can be realized with an electrical capacitance.
- At least one delay means of the received signal processing device can be functionally arranged between at least one input and at least one output of the at least one normalization means of the received signal processing device. In this way, with the at least one delay means, feedback can be implemented at the at least one normalization means. In this way, the overall let pass reception signal be further slowed down.
- the object is achieved according to the invention with the detection device in that at least one received signal processing device has a plurality of functionally parallel frequency filters with at least partially different frequency passbands and at least one frequency filter has at least one frequency identification means with which the signal generated by this at least one frequency filter passed pass-received signal can be marked with a frequency feature which characterizes the frequency passband of the at least one passing frequency filter.
- At least one control and evaluation device can have at least one evaluation means for determining information about the at least one monitoring area, in particular for determining object information such as distance, speed and/or direction of an object relative to the detection device, based on at least one frequency analysis. In this way, the corresponding information about the monitoring area can already be determined with the detection device.
- the at least one control and evaluation device can advantageously have at least one signal generation means for generating electrical transmission signals.
- At least one transmission device for emitting electromagnetic scanning signals can be controlled with the electrical transmission signals.
- the detection device can have at least one frequency comparison means, with which frequency differences between a frequency of an electrical transmission signal and a transmission reception signal determined with the reception signal processing device can be formed. In this way, a distance and/or a speed of a detected object relative to the detection device can be determined from the frequency difference.
- the object is achieved according to the invention in the method in that at least one received signal from a plurality of functionally parallel frequency filters is supplied with at least partially different frequency passbands and the passed through at least one frequency filter pass received signal is characterized with a frequency feature which characterizes the frequency passband of the at least one passing frequency filter.
- the at least one received signal is only passed through the frequency filters whose frequency passbands contain the frequency of the at least one received signal. If the frequency passbands of frequency filters that are adjacent in terms of frequency overlap, the at least one received signal can also be passed through both frequency filters if its frequency is in the overlapping range of the two frequency passbands.
- the transmission reception signal is identified with individual frequency characteristics by means of individual frequency identification means of the frequency filters. By means of the frequency characteristics, the at least one received signal is assigned to at least one of the defined frequency filters as a function of frequency and analyzed in this way with regard to frequency.
- FIG. 1 shows a front view of a vehicle with a driver assistance system and a LiDAR system for monitoring a monitoring area in front of the vehicle in the direction of travel;
- FIG. 2 shows a functional representation of the vehicle with the driver assistance system and the LiDAR system from FIG. 1;
- FIG. 3 shows a functional representation of a received signal processing device of the LiDAR system from FIGS. 1 and 2;
- FIG. 4 shows a power-time diagram of an electrical transmission signal in the form of a frequency-modulated continuous-wave signal of the LiDAR system from FIGS. 1 and 2, from which an electromagnetic scanning signal for monitoring the surveillance area is generated;
- FIG. 5 shows a frequency-time diagram of the electrical transmission signal from FIG. 4 and an electrical reception signal which is determined from an echo signal of the electromagnetic scanning signal;
- Figure 6 shows a section of the frequency-time diagram from Figure 5, in which a transmission chirp of the electrical transmission signal and a corresponding reception chirp of the electrical reception signal are shown, with the frequency axis showing the respective frequency passbands of frequency filters of the reception signal processing device of the LiDAR system from Figures 1 to 3 are marked.
- FIG. 1 shows a front view of a vehicle 10 by way of example in the form of a passenger car.
- Figure 2 shows a functional representation of vehicle 10.
- the vehicle 10 has a detection device, for example in the form of a LiDAR system 12.
- the LiDAR system 12 is arranged in the front bumper of the vehicle 10, for example.
- a monitoring area 14 in the direction of travel 16 in front of the vehicle 10 can be monitored for objects 18.
- the LiDAR system 12 can also be arranged elsewhere on the vehicle 10 and oriented differently.
- object information For example, distances r, directions and speeds of objects 18 relative to the vehicle 10 or the LiDAR system 12 are determined.
- the directions of objects can be specified as azimuth and/or elevation, for example.
- the objects 18 can be stationary or moving objects, for example other vehicles, people, animals, plants, obstacles, bumps in the road, for example potholes or stones, road boundaries, traffic signs, open spaces, for example parking spaces, precipitation or the like.
- the LiDAR system 12 is configured as a frequency-modulated continuous-wave LiDAR system, for example.
- Frequency-modulated continuous wave LiDAR systems are also referred to in technical circles as FMCW (Frequency modulated continuous wave) LiDAR systems.
- the LiDAR system 12 is connected to a driver assistance system 20 .
- the vehicle 10 can be operated autonomously or partially autonomously with the driver assistance system 20 .
- the LiDAR system 12 comprises a transmitting device 22, a receiving device 24 and a control and evaluation device 26.
- the control and evaluation device 26 has a received signal processing device 28.
- the received signal processing device 28 is shown in detail in FIG.
- control and evaluation device 26 can be arranged centrally or decentrally. Parts of the functions of the control and evaluation device 26 can also be integrated in the transmitting device 22 or the receiving device 24 .
- FIG. 4 shows exemplary transmission signal 30 in a power-time diagram.
- the electrical transmission signal 30 comprises a multiplicity of transmission sequences following one another in the form of transmission chirps 32.
- the transmission chirps 32 of the electrical transmission signal 30 are shown in dashed lines and, for comparison, the reception chirps 40 of a corresponding electrical reception signal 38, explained further below, are shown in a frequency-time diagram.
- the transmit chirps 32 and the receive chirps 40 each have the form of frequency ramps in the frequency-time diagram.
- Figure 6 shows an enlarged frequency-time diagram of one of the transmission chirps 32 with the corresponding reception chirp 40.
- the transmission device 22 can be controlled with the electrical transmission signals 30 so that it transmits corresponding electromagnetic scanning signals 34 in the form of light signals into the monitored area 14 .
- the transmission device 22 can have, for example, one or more lasers as a light source.
- the transmission device 22 can optionally have a signal deflection device with which the scanning signal 34 is correspondingly directed into the monitoring area 14 .
- the scanning signals 34 reflected on an object 18 in the direction of the receiving device 24 can be received with the receiving device 24 as electromagnetic echo signals 36 .
- the receiving device 24 can optionally have an echo signal deflection device, with which the electromagnetic echo signals 36 are directed to a receiver of the receiving device 24 .
- the receiver can be, for example, detectors, for example point sensors, line sensors and/or area sensors, in particular (avalanche) photodiodes, photodiode lines, CCD sensors, active pixel sensors, in particular CMOS sensors, or the like. Alternatively, multiple receivers can also be provided.
- the electromagnetic echo signal 36 can be converted into the received electrical signal 38, which is shown in FIGS.
- the reception chirps 40 are offset in time with respect to the respective transmission chirps 32 .
- the time offset characterizes the flight time between the transmission of the electromagnetic scanning signal 34 and the reception of the electromagnetic echo signal 36.
- the flight time is proportional to the distance r of the object 18 relative to the LiDAR system 12.
- the distance r can be determined from a frequency difference ⁇ f between the frequency ramp of the transmission chirp 32 and the frequency ramp of the corresponding reception chirp 40 . For this it is necessary to analyze the frequency of the received signal 38 .
- the frequency analysis of the received signal 38 is carried out with the received signal processing device 28.
- the received signal processing device 28 comprises a frequency filter arrangement 42, a normalization means 44 and an optional delay means 46.
- the frequency filter arrangement 42 has a number n of frequency filters FFi.
- the index i which characterizes the frequency filter, is between 1 and the number n of frequency filters.
- the frequency filters FFi are functionally connected in parallel.
- the frequency filters FFi are designed, for example, as bandpass filters in the form of resonant circuits. Each frequency filter FFi has an individual resonant frequency fresj and an individual frequency passband Di. The frequency passbands Di and the resonance frequencies fresj of the frequency filters FFi are shown as an example in the frequency-time diagram in FIG. The frequency filters FFi are designed in such a way that their frequency passbands Di connect to one another. Overall, the frequency passbands Di of all frequency filters FFi are distributed without gaps over the entire frequency range 48 of the electrical transmit signals 30 and the electrical receive signals 38. The frequency passbands Di of frequency filters FFi that are adjacent in terms of their resonant frequency fresi can partially overlap.
- each frequency filter FFi has an individual gain Zi.
- a transmission reception signal 49 that has passed through the corresponding frequency filter FFi is individually amplified with the respective individual amplification Zi.
- the individual amplification Zi serves as an identification means, with which the transmission received signal 49 is identified with a corresponding frequency characteristic, namely the individual degree of amplification.
- the individually amplified pass-through reception signal 49 can correspond to the respective Gen frequency filter FFi and thus its resonant frequency fresj and passband Di are assigned.
- the inputs of the frequency filter FFi are connected to an input 50 of the reception signal processing device 28 .
- the electrical reception signal 38 determined with the reception device 24 is present at the input 50 .
- the normalization means 44 includes an operational amplifier 52 and two amplifier resistors Rampi and Ram P 2.
- a minus input of the operational amplifier 52 is connected to the outputs of the frequency filter FFi.
- a plus input of the operational amplifier 52 is connected via the amplifier resistor Rampi to the input 50 of the received signal processing device 28 and to the inputs of the frequency filter FFi.
- the second amplifier resistor Ram P 2 connects the plus input of the operational amplifier 52 to ground GND.
- the strength of the transmission reception signal 49 present at the outputs of the frequency filter FFi is normalized with the normalization means 44 in relation to the strength of the electrical reception signal 38 present at the input 50 . In this case, the reception signal 38 is subtracted directly from the transmission reception signal 49 .
- the normalized transmission reception signal 49n is present at the output of the operational amplifier 52 .
- a dependency of the strength of the received signal 38 on the distance r of the object 18 is compensated for by normalizing the transmission received signal 49 .
- the optional delay means 46 comprises a capacitance CF with a resistance RF connected in parallel.
- the input of the delay means 46 is connected to the minus input of the operational amplifier 52 .
- the output of delay means 46 is connected to the output of operational amplifier 52 .
- the delay means 46 causes the normalized transmission reception signal 49n at the output of the operational amplifier 52 to be fed back to the minus input.
- the normalized pass-through received signal 49n is slowed down with the aid of the delay means 46 .
- the slowed down normalized transmission received signal 49n is present at the output 54 of the received signal processing device 28 .
- the deceleration enables a more energy-efficient further processing of the normalized transmission received signal 49n, for example with an analog/digital converter 56, which is connected to the output 54 of the received signal processing device 28. Due to the slowdown, multiplexing and digitization with bandwidths in the kilohertz range can be made possible.
- the frequency fEm of the electrical reception signal 38 is determined via the frequency characteristic of the normalized transmission reception signal 49n, namely the degree of amplification. determined and subtracted from the frequency fse.T of the transmission signal 30 at the same point in time T. If, as shown by way of example in Figure 6, the frequency fEm;T of the electrical reception signal 38 at time T is in the frequency passband Ü4 of the fourth frequency filter FF4, the calculation of the frequency difference Af can be used, for example, the resonant frequency f reS 4 of the fourth frequency filter FF4 be accepted.
- the distance r and possibly the speed of the object 18 relative to the LiDAR system 12 is determined from the frequency difference Af using the control and evaluation device 26 .
- the distance r, possibly the speed and possibly the direction, which are determined using the LiDAR system 12, are transmitted to the driver assistance system 20.
- the distance r, possibly the speed and possibly the direction are used with the driver assistance system 20 for the autonomous or partially autonomous operation of the vehicle 10 .
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Abstract
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020130881.7A DE102020130881A1 (de) | 2020-11-23 | 2020-11-23 | Empfangssignal-Verarbeitungseinrichtung einer Detektionsvorrichtung zur Überwachung wenigstens eines Überwachungsbereichs, Detektionsvorrichtung und Verfahren zum Betreiben einer Detektionsvorrichtung |
| PCT/EP2021/081946 WO2022106449A1 (de) | 2020-11-23 | 2021-11-17 | Empfangssignal-verarbeitungseinrichtung einer detektionsvorrichtung zur überwachung wenigstens eines überwachungsbereichs, detektionsvorrichtung und verfahren zum betreiben einer detektionsvorrichtung |
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| Publication Number | Publication Date |
|---|---|
| EP4248233A1 true EP4248233A1 (de) | 2023-09-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21815970.5A Pending EP4248233A1 (de) | 2020-11-23 | 2021-11-17 | Empfangssignal-verarbeitungseinrichtung einer detektionsvorrichtung zur überwachung wenigstens eines überwachungsbereichs, detektionsvorrichtung und verfahren zum betreiben einer detektionsvorrichtung |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20230408639A1 (de) |
| EP (1) | EP4248233A1 (de) |
| DE (1) | DE102020130881A1 (de) |
| WO (1) | WO2022106449A1 (de) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4241350A (en) | 1971-12-10 | 1980-12-23 | Scope, Inc. | Radar target pattern recognition system using logarithmic analysis |
| DE59506752D1 (de) | 1994-03-17 | 1999-10-14 | Siemens Ag | Verfahren und Vorrichtung zur Klassifizierung von Fahrzeugen mittels eines Verkehrsradargerätes |
| DE19754220B4 (de) | 1997-05-17 | 2010-10-28 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Erkennung einer bevorstehenden oder möglichen Kollision |
| ES2160087B1 (es) * | 2000-02-18 | 2003-03-01 | Mier Comunicaciones S A | Procedimiento para la repeticion de señales en insofrecuencia y repetidor de señales en isofrecuencia. |
| ITTO20010035A1 (it) * | 2001-01-19 | 2002-07-19 | Comau Systems Spa | Procedimento e sistema per misurare la distanza di un corpo mobile dauna parte fissa. |
| JP5584442B2 (ja) * | 2009-08-26 | 2014-09-03 | パナソニック株式会社 | 物体検知装置およびそれを備えた照明システム |
| DE112014005026T5 (de) * | 2013-12-03 | 2016-08-11 | Panasonic Intellectual Property Management Co., Ltd. | Signalverarbeitungsvorrichtung |
| EP3548840B1 (de) | 2016-11-29 | 2023-10-11 | Blackmore Sensors & Analytics, LLC | Verfahren und system zum klassifizieren eines objekts in einem punktwolkendatensatz |
| DE102018132745B4 (de) * | 2018-12-18 | 2022-05-05 | Infineon Technologies Ag | Fmcw radar mit störsignalunterdrückung im zeitbereich |
-
2020
- 2020-11-23 DE DE102020130881.7A patent/DE102020130881A1/de active Pending
-
2021
- 2021-11-17 EP EP21815970.5A patent/EP4248233A1/de active Pending
- 2021-11-17 WO PCT/EP2021/081946 patent/WO2022106449A1/de not_active Ceased
- 2021-11-17 US US18/254,011 patent/US20230408639A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020130881A1 (de) | 2022-05-25 |
| WO2022106449A1 (de) | 2022-05-27 |
| US20230408639A1 (en) | 2023-12-21 |
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