EP1309885A1 - Procede de modulation d'impulsion en largeur d'un systeme radar - Google Patents

Procede de modulation d'impulsion en largeur d'un systeme radar

Info

Publication number
EP1309885A1
EP1309885A1 EP01974099A EP01974099A EP1309885A1 EP 1309885 A1 EP1309885 A1 EP 1309885A1 EP 01974099 A EP01974099 A EP 01974099A EP 01974099 A EP01974099 A EP 01974099A EP 1309885 A1 EP1309885 A1 EP 1309885A1
Authority
EP
European Patent Office
Prior art keywords
signal
pulse
average power
radar system
transmission
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.)
Withdrawn
Application number
EP01974099A
Other languages
German (de)
English (en)
Inventor
Jens Kroeger
Ralph Mende
Karsten Schumann
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.)
ADC Automotive Distance Control Systems GmbH
Original Assignee
ADC Automotive Distance Control Systems 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 ADC Automotive Distance Control Systems GmbH filed Critical ADC Automotive Distance Control Systems GmbH
Publication of EP1309885A1 publication Critical patent/EP1309885A1/fr
Withdrawn legal-status Critical Current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
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/522—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated 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
    • G01S13/02—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
    • G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
    • G01S13/22—Systems for measuring distance only using transmission of interrupted, pulse modulated waves using irregular pulse repetition frequency

Definitions

  • the invention relates to a method for operating a radar system according to the preamble of patent claim 1.
  • Such a method is known for example from DE 1 97 54 720 A1.
  • the known method enables the simultaneous or separate determination of the
  • the radar system is switched over several times in a measurement process several times in short time intervals between a transmit mode and a receive mode.
  • a pulse-shaped transmission signal with successive transmission pulses of a specific pulse duration and a specific carrier frequency is emitted by at least one transmission unit of the radar system in each measurement phase of the measurement process in the respective transmission mode.
  • the transmission pulses are emitted at a time interval predetermined by a pulse repetition frequency and are reflected back on the reflection object or objects to the radar system, which receives and evaluates the reflected transmission pulses as a reception signal.
  • the energy reflected on the reflection object or objects depends strongly on the distance to the reflection object or objects, so that the method has a high signal dynamics.
  • high signal dynamics have an unfavorable effect on the price of the circuit parts required for signal processing.
  • the invention is therefore based on the object of improving the method according to the preamble of patent claim 1 in such a way that it can be carried out using inexpensive means.
  • successive transmission pulses of a specific pulse duration with a specific pulse repetition frequency are transmitted as a transmission signal in transmits the observation area and receive transmitted pulses of the transmitted signal as a received signal on the at least one reflection object.
  • the average power of the received signal is determined and limited to a predetermined power range by varying the average power of the transmitted signal.
  • the average power of the transmission signal is preferably varied by varying the pulse repetition frequency and / or pulse duration of the transmission pulses.
  • the pulse repetition frequency and / or pulse duration of the transmit pulses in cases in which the determined value of the average power of the received signal is greater than an upper power value, continuously or in steps, preferably with a predetermined rate of change, so far reduced the resulting mean power of the received signal is less than or equal to the upper power value.
  • the pulse repetition frequency and / or pulse duration of the transmission pulses in cases in which the determined value of the average power of the received signal is less than a lower power value is increased continuously or in stages until the resulting average power of the received signal is greater or is equal to the lower power value.
  • the transmit pulses are preferably transmitted with a specific carrier frequency, which is kept constant during the pulse duration of the respective transmit pulse becomes.
  • the carrier frequency is successively changed from transmit pulse to transmit pulse in at least one measurement phase.
  • the distance and / or speed of the at least one reflection object located in the observation area is preferably determined by evaluating the frequency difference and / or phase difference between the transmitted signal and the received signal.
  • FIG. 1 shows a block diagram of the radar system
  • 2a to 2c are timing diagrams of the transmit and receive signals
  • Figure 3 is a schematic representation of the frequency spectrum of the ins
  • a radar system as a vehicle distance warning system must clearly identify the distance and, if applicable, the speed, in particular the relative speed, of at least one reflection object, i.e. of vehicles traveling ahead, oncoming or following vehicles, people and other reflection objects, usually simultaneously of all reflection objects located in the observation area and determine with high resolution.
  • the desired range uniqueness range is 1 50 m
  • the desired distance resolution is 1 m
  • the desired speed resolution is 1 m / s.
  • an antenna emits a transmission signal with the transmission frequency of 76 GHz, for example. After passing through the transmission path, the antenna detects the reflection signal obtained by reflection on the preceding or following motor vehicles (reflection objects) as an analog reception signal.
  • the same antenna is used both for the transmission mode and for the reception mode, but different antennas can be provided for recording different angular ranges in successive measurement processes.
  • the received signal is further processed by a signal processing unit and evaluated with regard to frequency shift and / or phase shift from this the distance information and possibly the speed information obtained by spectral analysis.
  • the radar system has the following structure:
  • a transceiver unit 1 with an antenna unit 1 1, a transmitting side 1 a, a receiving side 1 b and an oscillator 13, which combines the functions of the transmitting unit and the receiving unit and whose essential components are summarized compactly as a single module.
  • a signal processing unit 2 consisting of a band-limiting preamplifier 21, a digital signal processing unit 22, for example a digital signal processor, a frequency converter 23, a local oscillator 24, an anti-aliasing filter 25 and an analog-digital converter 26.
  • a control unit 3 which controls the two RF switches transmit / receive switches 1 21 and LO switches 1 22 of the RF switching unit 1 2 and modulates the oscillator 13.
  • the control unit 3 is controlled by the digital processing unit 22 in order to synchronize the transceiver unit 1 and the signal processing unit 2.
  • the antenna unit 1 1 of the transceiver unit 1 is provided for emission of the transmit signal and detection of the received signal. It comprises several antennas 1 1 1, 1 1 2, 1 1 3 and an antenna switch 1 21 for selection of the respective antenna 1 1 1 or 1 1 2 or 1 13, each of the antennas 1 1 1, 1 1 2, 1 13 is selected for each measuring process with a different angular range of the transmission signal.
  • the antenna switch 1 14 is switched as a function of the duration of a measurement process.
  • the transmit / receive switch 1 21 and the LO switch 1 22 are in the left position in the transmit mode and in the right position in the receive mode.
  • RF radiation is generated by means of an oscillator 1 3, for example in the form of a VCO generated;
  • the linearly modulable oscillator 13 can be switched linearly in the oscillator frequency, for example with a switching frequency of 500 kHz, ie the carrier frequency of the transmission pulses can be successively varied within a predetermined frequency bandwidth.
  • the carrier frequency is kept constant during a transmission pulse.
  • the pulse repetition frequency is 500 kHz
  • ie the period tP of a pulse cycle consisting of pulse duration tON and pulse pause is, for example, 2 ⁇ s.
  • the pulse duty factor of the transmission signal ie the ratio of pulse duration tON to period tP, is set to 50%, for example, at the beginning of the measuring process.
  • the reflection signals of all reflection objects originating from the last transmission pulse emitted are detected as the reception signal before the emission of the next transmission pulse.
  • a mixer 14 provided in the reception side 1b of the transceiver unit 1 converts the received signal by multiplication with that during a
  • the mixed signal emitted by the mixer 14 is amplified by the band-limiting preamplifier 21 and filtered at the same time. In order to avoid the coupling of interference signals, it is advisable to deactivate the preamplifier 21 via the control unit 3 during transmission.
  • the amplified and filtered mixed signal is then fed to the frequency converter 23 and converted into the baseband by the latter with an intermediate frequency generated with the local oscillator 24.
  • the mixed signal converted into the baseband is then fed via the anti-aliasing filter 25 to the analog-digital converter 23 and sampled by it, and thus digitized.
  • the anti-aliasing filter 25 has a cut-off frequency of approximately 100 kHz, since the frequency shifts between transmit and receive signals occurring in automotive applications are less than 100 kHz and are therefore in the pass band of the anti-aliasing filter 25.
  • the digitized mixed signal is then processed in the digital signal processing unit 24 by means of a spectral analysis.
  • the received signal can already be converted into the baseband in the transceiver unit 1 with the mixer 14; In this case, the second frequency conversion with the frequency converter 23 is omitted and the function of the anti-aliasing filter 25 can be taken over by the preamplifier 12 due to its band-limiting effect.
  • the average power of the received signal is determined in the digital signal processing unit 24 on the basis of the amplitude of the digitized mixed signal, and it is checked whether the determined value of the average power of the received signal is greater than a predetermined upper power value or less than a predetermined lower power value. If the determined value is greater than the upper power value, the average transmission power is reduced by reducing the pulse repetition frequency and / or pulse duration of the transmission pulses until the resulting average power of the transmission signal is below the upper power value. If, on the other hand, the determined value is less than the lower power value, the average transmission power is increased by increasing the pulse repetition frequency and / or pulse duration of the transmission pulses until the resulting average power of the transmission signal is above the lower power value.
  • the mean power of the received signal is thus set to a value between the upper and lower power value.
  • the relationship between the pulse repetition frequency or pulse duration and the average power of the received signal can best be illustrated with the aid of FIGS. 2a to 2c, in which the transmit signal with s, the receive signal with r, the pulse duration of a transmit pulse with tON, the period with tP and the Signal runtime is denoted by tRO. Only the envelopes of the transmit and receive signals are shown.
  • the pulse repetition frequency 1 / tP is selected, for example, as follows: in the time diagram according to FIG. 2a it is 500 kHz, in the time diagram according to FIG. 2b it is 250 kHz and in the time diagram according to FIG. 2c it is again 500 kHz. In the case of FIGS.
  • the reflection object is so close to the radar system that the signal transit time tRO from the radar system to the reflection object and back is shorter than the pulse duration tON. From the Reflected pulses are cut out, since the radar system is only ready to receive from the time tON, the areas shown in dashed lines. Since the average power of the received signal r is equal to the area under the receiving pulse related to the period tP, it can be seen directly from FIGS. 2a to 2c that the average power of the received signal r is lower in the case of FIGS. 2b and 2c than in FIG In the case of FIG. 2a, ie by increasing the period tP, ie by reducing the pulse repetition frequency, and by reducing the pulse duration tON of the transmission signal s, the average power of the reception signal r is reduced.
  • FIG. 3 shows the frequency spectrum of the received signal r according to FIG. 2a after its frequency conversion into the baseband, ie. h the signal supplied to the anti-aliasing filter 25.
  • the line labeled rO corresponds to the main line of the received signal r. Its position is a measure of the frequency shift between the carrier frequency of the transmission signal s and the carrier frequency of the reception signal r, which is determined by the downstream digital signal processing unit 22.
  • the secondary lines of the received signal r are designated r1 and r1 *.
  • the frequency range hO to be evaluated and the pass band h of the anti-aliasing filter 25 also shows the frequency range hO to be evaluated and the pass band h of the anti-aliasing filter 25.
  • the secondary lines r1, r1 * lie outside the pass band h and are thus suppressed by the anti-aliasing filter 25. If the pulse repetition frequency is reduced to half from 500 kHz to reduce the average power of the transmission signal s, for example, the distance between the spectral lines rO, r1, li * is also reduced to half. The secondary lines r1, r1 * remain outside the pass band h and are thus still suppressed by the anti-aliasing filter 25. In addition, the spectral lines are also reduced in height, which corresponds to the desired reduction in the average power of the received signal r.
  • the pulse duration tON of the transmit pulses is reduced as shown in FIG. 2c, starting from a transmit signal s according to FIG. 2a, this has no effect on the position of the spectral lines rO, r1, r1 * of the received signal r while the pulse repetition frequency tP "1 remains the same.
  • the method according to the invention is not limited to use in the radar system according to FIG. 1; Rather, it can be used in any radar system for motor vehicle applications which emits transmission pulses with a specific carrier frequency, receives the reflected transmission pulses as a reception signal and limits the bandwidth before the evaluation.
  • the evaluation of the received signal with regard to the power limitation of the transmission signal can take place in the same signal processing branch in which the distance and / or speed of the reflection object is also determined, but it can also be carried out in a separate circuit part provided specifically for power limitation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

Les systèmes radar sont utilisés pour déterminer la distance à laquelle se trouve au moins un objet réfléchissant présent dans le champ d'observation et/ou la vitesse desdits objets réfléchissants. Un système radar de ce type émet des impulsions d'émission successives dans le temps, ayant une durée d'impulsion déterminée, avec une fréquence de répétition d'impulsion donnée, en tant que signal d'émission, dans le champ d'observation, et reçoit des impulsions du signal d'émission, réfléchies contre les objets réfléchissants, en tant que signal de réception. Ce procédé présente l'inconvénient d'une dynamique de signal élevée qui a pour conséquence des répercussions défavorables sur le prix des parties de circuit nécessaires au traitement des signaux. Le procédé de fonctionnement de système radar de la présente invention peut être mis en oeuvre avec des moyens peu onéreux. Ledit procédé permet de réduire la dynamique de signal par détermination de la puissance moyenne du signal de réception et par sa réduction à un domaine de fréquences prédéterminé, grâce à la variation de la puissance moyenne du signal d'émission, de préférence grâce à la variation de la fréquence de répétition d'impulsion et/ou de la durée d'impulsion des impulsions. Le procédé convient particulièrement au fonctionnement d'un système de signalisation de distance de véhicule.
EP01974099A 2000-08-16 2001-08-02 Procede de modulation d'impulsion en largeur d'un systeme radar Withdrawn EP1309885A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10039943A DE10039943A1 (de) 2000-08-16 2000-08-16 Verfahren zum Betreiben eines Radarsystems
DE10039943 2000-08-16
PCT/EP2001/008963 WO2002014902A1 (fr) 2000-08-16 2001-08-02 Procede de modulation d'impulsion en largeur d'un systeme radar

Publications (1)

Publication Number Publication Date
EP1309885A1 true EP1309885A1 (fr) 2003-05-14

Family

ID=7652559

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01974099A Withdrawn EP1309885A1 (fr) 2000-08-16 2001-08-02 Procede de modulation d'impulsion en largeur d'un systeme radar

Country Status (4)

Country Link
US (1) US6844842B2 (fr)
EP (1) EP1309885A1 (fr)
DE (1) DE10039943A1 (fr)
WO (1) WO2002014902A1 (fr)

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Also Published As

Publication number Publication date
WO2002014902A1 (fr) 2002-02-21
DE10039943A1 (de) 2002-02-28
US20040004567A1 (en) 2004-01-08
US6844842B2 (en) 2005-01-18

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