EP1697762A1 - Aide au stationnement comportant au moins deux capteurs de mesure directe ou a echo croise - Google Patents

Aide au stationnement comportant au moins deux capteurs de mesure directe ou a echo croise

Info

Publication number
EP1697762A1
EP1697762A1 EP04798175A EP04798175A EP1697762A1 EP 1697762 A1 EP1697762 A1 EP 1697762A1 EP 04798175 A EP04798175 A EP 04798175A EP 04798175 A EP04798175 A EP 04798175A EP 1697762 A1 EP1697762 A1 EP 1697762A1
Authority
EP
European Patent Office
Prior art keywords
radar
sensors
sensor
signals
cross
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.)
Ceased
Application number
EP04798175A
Other languages
German (de)
English (en)
Inventor
Thomas Brosche
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1697762A1 publication Critical patent/EP1697762A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S13/325—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of coded signals, e.g. P.S.K. 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
    • G01S13/87—Combinations of radar systems, e.g. primary radar and secondary radar
    • G01S13/878—Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector
    • 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/87—Combinations of sonar systems
    • G01S15/876—Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector
    • G01S15/878—Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector wherein transceivers are operated, either sequentially or simultaneously, both in bi-static and in mono-static mode, e.g. cross-echo mode
    • 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
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/292—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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/87—Combinations of sonar systems
    • G01S15/876—Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector
    • 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
    • G01S15/931—Sonar 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
    • G01S17/87—Combinations of systems using electromagnetic waves other than radio waves
    • 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
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/46—Indirect determination of position data
    • G01S2013/466—Indirect determination of position data by Trilateration, i.e. two antennas or two sensors determine separately the distance to a target, whereby with the knowledge of the baseline length, i.e. the distance between the antennas or sensors, the position data of the target is determined
    • 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
    • G01S2013/9314—Parking operations
    • 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
    • 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
    • G01S2013/9324—Alternative operation using ultrasonic waves
    • 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
    • G01S2013/9325—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles for inter-vehicle distance regulation, e.g. navigating in platoons
    • 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
    • G01S2013/9327—Sensor installation details
    • G01S2013/93271—Sensor installation details in the front of the 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
    • G01S2013/9327—Sensor installation details
    • G01S2013/93272—Sensor installation details in the back of the 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
    • G01S2013/9327—Sensor installation details
    • G01S2013/93274—Sensor installation details on the side of the 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
    • 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
    • G01S7/483—Details of pulse systems
    • G01S7/486—Receivers
    • G01S7/487—Extracting wanted echo signals, e.g. pulse detection
    • 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
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/523—Details of pulse systems
    • G01S7/526—Receivers
    • G01S7/527—Extracting wanted echo signals

Definitions

  • the invention relates to a system with two or more corresponding sensors, each sensor having a transmitter and at least one receiver for signals, and one sensor being able to receive a cross echo signal from another sensor.
  • Radar sensors are u. a. used in Kraftfalirzeugtechnik to the distance of a Kraftfalxrzeugs to a fixed or movable obstacle such as a pedestrian z. B. when parking and the driver of the motor vehicle via appropriate display means u. a. display the distance to the obstacle optically or acoustically.
  • radar sensors are arranged on the front and / or on the rear and on the side, for monitoring a lateral area of the motor vehicle, as part of a radar system known to the person skilled in the art.
  • the radar system can be part of a driver assistance system which is also known.
  • a radar sensor with pulse modulation has a pulse generator, a transmitter with a transmitting antenna, a receiver with a receiving antenna and one Evaluation electronics.
  • the radar pulses emitted by the transmitting antenna are reflected on a target object and return to the receiver via the receiving antenna. There they are mixed with a reference signal from the pulse generator, filtered with a low-pass filter and evaluated by an electronic evaluation unit after an A / D conversion.
  • the distance to a target object and its relative speed to the radar sensor and thus to the motor vehicle can thus be determined.
  • pulse modulation other modulation methods are also possible, for example: FMCW, PSK, ASK, FSK, modulation with pseudo-noise (PN) codes and other methods or combinations of the methods.
  • PN pseudo-noise
  • the radar signal emitted by a radar sensor can be reflected at the target and can be received by the antenna of another radar sensor as a cross echo. This can lead to interference or interference with the intrinsic echo of the radar signal emitted by this radar sensor.
  • a disadvantage here is that a considerable amount of circuitry and control is always required to decouple the different radar sensors from one another and the self-echo and cross-echo signals received separate from each other.
  • the performance of a radar sensor can also be reduced by modulating the radar pulses.
  • the radar sensors which are respectively switched off on the transmitter side cannot receive their own echoes in the switched-off state.
  • the invention has for its object to provide a system with two or more sensors, in which the sensors can also receive and evaluate the reflected signals of the other sensors without mutual interference and in which
  • the main idea of the invention is that the transmit and receive operation at
  • each of the sensors of a system or the respectively associated receiver receives or evaluates intrinsic or cross echo signals only for specific intervals, the time delay of the received signal with respect to its own transmitted signal.
  • the different time intervals should not overlap each other. This is achieved by choosing the phase position of the repetition frequency f w of the transmission signal suitable for each sensor, ie differently.
  • the time intervals mentioned relate to twice the transit time of the signal moving at a speed, in particular at the speed of light c.
  • the system according to the invention is a radar system with two or more corresponding radar sensors, an optical system with two or more corresponding optical sensors or an ultrasound system with two or more corresponding ultrasound sensors can.
  • the system is a radar system with two or more corresponding radar sensors, each radar sensor having a transmitter and at least one receiver for a modulated one Radar signal and a radar sensor can receive a cross echo signal from another radar sensor, the radar sensors according to the invention are separated from each other in the receive mode by the time delay of the transmit and receive signals.
  • the solution according to the invention consists in the fact that the transmission and reception operation is coordinated and timed with one another when using a plurality of corresponding radar sensors in such a way that each of the radar sensors of a radar system or the respectively assigned receiver only compares the time delay of the received signal for specific intervals receives or evaluates its own transmission signal, own or cross-sectional signals.
  • the different time intervals should not overlap each other. This is achieved by choosing the phase position of the repetition frequency f w of the transmission signal suitable for each radar sensor, ie differently.
  • the specified time intervals relate to twice the transit time of the radar signal moving at the speed of light c.
  • All corresponding radar sensors continuously transmit radar signals (eg pulses, PN code frames) with the repetition frequency f w and are not, as in, for example, in
  • EP 0 864 880 provided, cyclically switched off. A separation of the different received radar echoes, i.e. An analysis of the cross echo signals and the self-echo is then possible with the usual signal evaluation methods or coding methods for the radar pulses.
  • the invention is also applicable to radar systems which, for example, use carrier signals modulated with PN codes (for example by means of PSK, ASK or FSK modulation) instead of pulse modulation.
  • PN codes for example by means of PSK, ASK or FSK modulation
  • a decoupling between the signals can be achieved in accordance with the core ideas of the invention, regardless of the codes selected in each case.
  • the corresponding radar sensors simultaneously transmit repetitive code frames with the repetition frequency f w , which are shifted or delayed from one another in a suitable manner. It is not necessary to use different codes for the radar sensors mentioned.
  • the advantage of the invention is that there is a separation and decoupling between the signals of the different radar sensors.
  • an evaluation of the cross echo signals transmitted by other radar sensors is possible.
  • the determination of the outer forni of the target object which has reflected the radar signals e.g. B. a concave or convex shape or its extension.
  • a more precise trilateration or location determination of the target objects is also possible and the occurrence of apparent targets can be significantly reduced by incorrect assignments of individual reflections.
  • the repetition frequency /, z. ß. also the repetition frequency of a PN code frame of a PN radar, as characterized in claim 3.
  • Range R max of each radar sensor can be set such that this target distance R max , at which the radar signals reflected by targets are still registered in the receiver, corresponds at most to the distance R e i nd at which the received radar signals can still be clearly assigned. It is therefore avoided that a target becomes appropriate at a distance that no longer allows a clear measurement result.
  • the distance range which is monitored by a radar sensor, usually begins at a minimum distance r a from the radar sensor if the immediate near range cannot be detected by the radar sensor.
  • an area of the radar sensor [r a ; rj within the interval [0; R max ] as specified in claim 4.
  • the respective signal transit times of the radar pulses from the transmitter to a target object in the detection range and back to the receiver are therefore in the time interval [2r a / c; 2r b / c] or [4; ⁇ j, which in turn is within the time interval [0; l / f w ].
  • the delays of the periodic transmission signals t S ( - of the individual radar sensors within the above-mentioned interval [0; l / f w ]) must be selected in this way that the delay times of the received signals in the individual radar sensors, which each monitor a certain spatial distance, do not overlap in order to decouple them from one another
  • a low repetition frequency _ of the transmitted code frame can be selected, in particular in the case of PN-coded radar signals. For example, for a 10-bit PN code and with a bit clock frequency or chip clock frequency of 250 MHz, this results in a repetition frequency of the code frame of TA 244 kHz, so that within the temporal interval of a code frame period of [0s; 4 ⁇ s] a clear distance measurement is possible with the radar sensor. This corresponds to the highest possible clear distance R ad of 614 meters.
  • a time delay of the transmission signal (radar pulse or PN-coded carrier) of each individual radar sensor is determined by t si to ensure that cross echo signals from the other corresponding radar sensors are only used for defined ones , disjoint intervals of the time delay t si and the corresponding apparent distance intervals are visible in the receiver of the respective radar sensor.
  • the self-echo signals of the corresponding sensor are evaluated unchanged.
  • the detection and evaluation of the self-echo signal and the nA further cross-echo signals can take place sequentially or in parallel in several receiver units of a radar sensor, as stated in claim 7. No further recipients are required for sequential recording. It is possible that both methods are combined.
  • the corresponding configurations of the electronic evaluation units are possible for the person skilled in the art.
  • FIG. 1 is a block diagram of a pulse radar
  • FIG. 2 shows a section of the division of the intervals for the time delay when several radar sensors are operated
  • FIG. 3 shows a block diagram of a pulse radar with several receivers.
  • a radar sensor 10 of a pulse radar system known per se can be seen from the schematic illustration in FIG.
  • the radar sensor 10 essentially consists of a pulse generator 11, which causes a transmitter 12 to emit a radar pulse 19 via a transmission antenna 13.
  • the radar pulse 19 is on a target object 18, for. B. another motor vehicle, a fixed obstacle or a pedestrian, reflects 20 and from a receiving antenna 14 to a receiver 15 of the
  • the received signal 20 is mixed with a reference signal of the pulse generator 11 and forwarded to an evaluation unit 17 via a low-pass filter and A / D converter 16.
  • the reference signal can be offset in time from the transmission signal.
  • the received signal 20 with respect to the distance and the relative speed of the
  • Target object 18 to radar sensor 10 or to a motor vehicle equipped with it is analyzed.
  • a first interval [t a ; The first of the four radar sensors 10 receives its own echo and the n- further radar sensors each receive the cross echo transmitted by the first radar sensor.
  • the first radar sensor 10 receives, for example, the cross echo signal of the third radar sensor, etc. The one between them
  • Periods of reception intervals are necessary to ensure the uniqueness when measuring the self-echo and the cross echo, taking into account the radar equation. After the total period Vf, one period has ended and the process is repeated.
  • the continuously transmitting radar sensors 10 are thus decoupled or separated from one another in the transmit and receive mode by the time delay, such that the self-echo signals and the cross-echo signals of the other three radar sensors 10 can be detected and processed by a radar sensor 10 without undesired interference or interference occurring.
  • the radar sensor 10 shown in FIG. 3 has three receivers 15 and accordingly three low-pass filters and A / D converters 16 in order to generate both a self-echo signal and two further cross-echo signals from two further radar sensors 10, all from the antenna 14 are received, received and processed and each to a common

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

L'invention concerne un système comportant au moins deux capteurs dans lequel chaque capteur présente un émetteur et un récepteur de signaux, et un capteur peut recevoir un signal à écho croisé d'un autre capteur. L'invention vise à mettre en oeuvre un tel système dans lequel les capteurs peuvent également recevoir et évaluer les signaux réfléchis des autres capteurs, sans interférences mutuelles, et dans lequel les capteurs sont découplés les uns par rapport aux autres. A cet effet, les capteurs sont séparés temporellement les uns par rapport aux autres, en mode de réception, par le décalage temporel des signaux d'émission et de réception.
EP04798175A 2003-12-19 2004-11-08 Aide au stationnement comportant au moins deux capteurs de mesure directe ou a echo croise Ceased EP1697762A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10360889A DE10360889A1 (de) 2003-12-19 2003-12-19 System mit zwei oder mehr Sensoren
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DE10360889A1 (de) 2005-07-14
CN1894596A (zh) 2007-01-10
JP2007514945A (ja) 2007-06-07
US20070241955A1 (en) 2007-10-18
WO2005062071A1 (fr) 2005-07-07

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