WO2001018559A1 - Systeme et procede pour radar a courte portee - Google Patents

Systeme et procede pour radar a courte portee Download PDF

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Publication number
WO2001018559A1
WO2001018559A1 PCT/US2000/022015 US0022015W WO0118559A1 WO 2001018559 A1 WO2001018559 A1 WO 2001018559A1 US 0022015 W US0022015 W US 0022015W WO 0118559 A1 WO0118559 A1 WO 0118559A1
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WO
WIPO (PCT)
Prior art keywords
pulse
reflected
antenna
coupled
signal
Prior art date
Application number
PCT/US2000/022015
Other languages
English (en)
Inventor
Clyde Shaver
Original Assignee
Preco, Inc.
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 Preco, Inc. filed Critical Preco, Inc.
Priority to AU69017/00A priority Critical patent/AU6901700A/en
Publication of WO2001018559A1 publication Critical patent/WO2001018559A1/fr

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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
    • 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
    • G01S7/282—Transmitters
    • 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
    • G01S13/103—Systems for measuring distance only using transmission of interrupted, pulse modulated waves particularities of the measurement of the distance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0037—Particular feeding systems linear waveguide fed arrays
    • H01Q21/0043—Slotted waveguides
    • H01Q21/005—Slotted waveguides arrays
    • 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
    • G01S13/18—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein range gates are used

Definitions

  • the invention relates to the field of short range radar systems used to detect objects at relatively close distances, wherein the transmitter of the system transmits a pulse having a relatively long pulse duration.
  • These pulses can be in the range of 5 nanoseconds and can be low power having a narrow frequency bandwidth which minimizes the possibility of interference with other high frequency signals.
  • high frequency signals can be used to detect objects by transmitting a burst of high frequency energy (i.e. frequency in the range to millions or billions of cycles per second ' often referred to as radio frequency or RF) from a transmitting antenna.
  • a receiving antenna is then used to detect RF energy reflected back by an object which is in the range of the burst of RF energy (RF pulse).
  • RF pulse RF energy
  • Prior systems for radar detection of proximate objects utilize a narrow pulse width, wide frequency band, high power signals. These prior systems transmit an RF pulse which often has a bandwidth of approximately 500Mhz or more.
  • the problem with utilizing such a broad frequency range is that the transmitted RF pulse could interfere with a number of other signals which are being transmitted and received by other systems, such as cellular phone systems, and radio and television signals.
  • a wide pulse is used, the RF pulse from the transmitting antenna signal will be propagated directly to the receiving antenna for an amount of time equal to the time of the pulse.
  • This direct transfer of energy from the transmitting antenna to the receiving antenna is sometimes referred to as the main bang.
  • a problem occurs where an object is very close to the transmitting and receiving antennas. Under these circumstances the object will reflect a signal back to the receiving antenna while the receiving antenna is still receiving RF pulse directly from the transmitting antenna.
  • the prior art systems utilizing narrow pulse width, high frequency bandwidth RF signals have rarely been used because the wide bandwidth signal is far outside of the FCC regulations which allow for a typical maximum bandwith of 150 Mhz centered on 5.8 GHz for a 5.8 GHz RF signal and less at other frequencies.
  • a prior device is a system using a digitizing receiver, such as a digital oscilloscope, as the detection engine with an ultra wide spark gap impulse transmitters. This type of system generates a very wide frequency bandwidth signal which could cause a great deal of interference with other signals, and would likely run afoul of FCC requirements.
  • These spark gap impluse transmitters have a bandwidth of at least 2 Ghz which is far outside of FCC bandwidth requirements.
  • An object of the invention is to provide a reliable, simple, and sensitive short range radar, that will operate using a relatively long pulse width signal, which has a correspondingly narrow frequency bandwidth, and is less likely to interfere with other signals. This will increase the likelihood that the system will comply with the FCC's rules for an unlicensed device.
  • Another object of the invention is to detect high and low reflectivity targets which are within a range of approximately 0 to 50 feet of the transmitting antenna. This can provide a reliable solution to the "blind spot" problem that drivers of vehicles face.
  • the blind spot is the area which is not easily viewable in rearview mirror of a vehicle, such as a car or truck.
  • Another object of the invention is to provide a short-range radar that overcomes shortcomings of other types of radar detection systems. This is accomplished by using techniques and components that other systems do not utilize.
  • One embodiment of the invention utilizes a high repetition rate, time- down conversion receiving apparatus, and couples it with a unique complex RF signal generator and other elements to effect a system and apparatus which utilizes a wide pulse width, low power RF pulse.
  • One embodiment of the invention takes millions of samples across a given area adjacent to the radar system and averages the samples to give a very good signal to noise ratio (SNR). This means that the strength of the information signal is much greater than the strength of the noise which could distort or hide the information signal. By lowering the noise floor, the LDS (least discernable signal) is increased, and the necessary transmission signal is decreased. This allows the radar to pull out of the noise, signals that would normally be hidden. This helps to allow the device to operate at relatively small power levels at the transmitter, while still being able to clearly detect the reflected signals at the receiver.
  • an isolation network between transmitter and receiver allows very sensitive operation to be realized.
  • the transmitted RF pulse can be made to comply with the requirements of narrow bandwidth and low power transmission.
  • a long pulse would normally cause an inability to detect objects at very close range, because the main bang signal would mask any return coming back in this time window.
  • This difficulty is overcome in the present invention by pulse conditioning and detecting the trailing edge of the RF pulse initially received by the receiver, where the initial part of the initial RF pulse is due to the main bang, but the trailing edge of the initial pulse may be extended beyond where the trailing pulse would exist if initial pulse consisted of energy which was solely derived from the main pulse.
  • Fig. 1 is a system level block diagram of one embodiment of the invention.
  • Fig. 2 is a detailed block diagram of the pulsed RF dual phase transmitter block of Fig. 1.
  • Fig. 3 is a diagram of the radar range where an object is present.
  • Fig. 4 is a diagram showing a transmitted RF pulse and corresponding
  • Fig. 5 is a diagram showing a transmitted RF pulse and corresponding reflected pulses which are received by the receiving antenna.
  • Figs. 6 A and B are isometric and planar views of an embodiment of a slotted array antenna having signal shaping guides.
  • Fig. 7 is a diagram showing the shape of projected RF pulses from the slotted array antenna shown in Fig. 6.
  • Fig. 8 is a diagram showing one embodiment of a high speed gated receiver and a low noise amplifier.
  • FIG. 1 shows a detailed system block diagram of one embodiment of the invention.
  • a quartz crystal oscillator 10 is used to generate a reference signal of 20Mhz. It would be obvious to one of ordinary skill in the art that a number of other oscillators could be used to generate a different reference signal for the system.
  • another type of oscillator which could be used is an resistor/capacitor (RC) type oscillator.
  • the signal output by the crystal oscillator 10 is then input into a pulse repetition frequency divide by circuit (PRF) select circuit 20. This circuit uses the signal output by the oscillator to output another signal with a different frequency. In the preferred embodiment the output of the PRF circuit 20 is a 5Mhz signal.
  • PRF pulse repetition frequency divide by circuit
  • This 5Mhz signal is used as a trigger signal 30 to drive the transmitter 50.
  • the transmitter can be implemented in a number of ways as one of ordinary skill in the art would appreciate, and a wide range of trigger pulse frequencies could be used.
  • the 5Mhz signal is used to drive a gas-fet to produce a 5.8 Ghz RF pulse at 5Mhz having a 50% duty cycle square wave which is used as the RF trigger pulse.
  • the transmitter 50 is a pulsed RF dual phase transmitter. As shown in Fig. 2, this transmitter includes a RF generator having an RF oscillator which generates a high frequency signal. In the preferred embodiment this is a 5.8 Ghz signal.
  • the 5 Mhz trigger pulse signal operates to activate RF generator to output pulses of the 5.8 Ghz signal at a rate of 5 million pulses per second, i.e. at a pulse rate of 5 Mhz PRF ( pulse repetition frequency)(i.e. the trigger pulse frequency).
  • the duration of each RF pulse is 12 nanoseconds. In the frequency spectrum this 12 nanosecond pulse width corresponds to a 3 db frequency bandwidth of less than 90 MHz.
  • the 12 nanosecond pulse of RF goes from the RF oscillator to a power splitter 52 which splits the power of the RF pulse. As shown in Fig. 2, one branch of the RF pulse is then shifted in phase in the phase shifter 54.
  • this phase shifting changes the phase of the signal by 90 degrees.
  • the power combiner 56 recombines the two signals into a complex RF signal having components with two different phases.
  • This complex RF signal is then routed through an RF attenuator/bandwidth shaping and matching network 40.
  • the purpose of the attenuator and matching network 40 is to allow the complex RF pulse to propagate from the output of the power combiner to the transmitting antenna 60 with as little signal reflection as possible.
  • the goal of the matching network is to reduce the reflection coefficient going from the RF generation circuitry to the transmission antenna to zero.
  • the power splitter 52 and phase shifting elements 54 provide the system with the ability to output a complex signal, which can significantly aid the system in being able to obtain accurate usable information while still transmitting relatively low power RF pulses.
  • the RF pulse typically transmitted only one phase component.
  • the object In such systems when the RF impulse was reflected by an object which did not have a single hard boundary, such as a concrete wall, there was a possibility for the object to reflect the RF pulse back to the receiving antenna, such that the reflected pulse would have multiple components having different phases. In some circumstances these different phases could be out of phase such that the combination of the out-of- phase signals in the high speed gated receiver 140 would result in a near zero measurement, and as a result the system might fail to detect the object.
  • One way to reduce the possibility of this occurring in the prior systems was to simply increase the power level of the transmitted RF pulse.
  • the transmitting antenna 60 is a slotted wave guide antenna having signal shaping guides to aid in controlling the direction of the RF signal projected from the antenna.
  • signal shaping guides to aid in controlling the direction of the RF signal projected from the antenna.
  • the receiving antenna 120 is identical to the transmitting antenna. This antenna receives a signal which is reflected off an object.
  • Fig. 3 shows the general operation of the system.
  • the system operates by providing an RF pulse from the transmitting antenna 60. This RF pulse then propagates into the range of field 300. Where an object 310 exists in the range of field, a portion of the RF energy incident upon it will be reflected back to the receiving antenna 120. The system can then calculate how long it takes for the RF energy to travel from the transmitting antenna to the receiving antenna and based on the elapsed time, determine the location of the object relative to the transmitting and receiving antennas.
  • the isolation network 110 operates to shield the receiver 140 from the initial impulse of RF pulse which is transmitted from the transmitting antenna directly to the receiving antenna when the RF pulse is initially transmitted i.e. the main bang.
  • the isolation network attenuates the signal during this initial pulse by about 60-80 db.
  • the isolation network 110 is actually incorporated in to the circuit connection with the receiving antenna 120.
  • the receiving antenna 120 is slotted array antenna and the connection to the back panel of the slotted array antenna can be a microstrip to waveguide probe launch.
  • the limiting low-noise amplifier 100 operates to improve the signal to noise ratio of the RF signal by providing approximately 30 db of amplification to the received RF pulse at 5.8Ghz. This amplification serves to increase the power of the transmitted and received signal relative to noise which is also present at the input of the low-noise amplifier 100.
  • the high speed gated receiver 140 is driven by a trigger pulse fifty percent duty cycle 5Mhz square wave which is output by the receive trigger pulse 90.
  • the receive trigger pulse operates in the same manner as the transmit trigger pulse, but the output of the receive trigger pulse is delayed to coincide with the amount of time it takes the RF pulse to travel from the transmitting antenna to the receiving antenna.
  • the high speed gated receiver detects a signal indicating that an RF pulse was received a certain amount of time after the RF pulse was transmitted from the antenna 60, then the digital signal processor 160 will be able to calculate the distance which the signal traveled going from the transmitting antenna to the receiving antenna based on the amount of delay incurred.
  • the receiver is a sample and hold receiver.
  • the receiver operates in conjunction with the transmission part of the system.
  • a very simple example is shown where the transmitter outputs a signal at a time tO.
  • the receiver can then be turned on at a time tO+15 nanoseconds. If the receiver determines that there is a reflected RF pulse at the time t0+15 nanoseconds, then it can be determined that there is an object at a point equal to 7.5 nanoseconds away from the transmitting antenna. This would correspond to an object approximately 7.5 feet from the transmitting antenna.
  • the receiver and transmitter are used in conjunction with each other to take samples at very close time increments.
  • the scan rate set at 40 Hz (25msec scan rate) in 25miliseconds with a 5Mhz PRF there are 125,000 pulses per scan. This equates to a sample every 2.4 mils. This technique is well known in the art.
  • the RF pulse of 5.8 Ghz is transmitted from the transmitting antenna for a period t3 — 11. In one embodiment of the invention this period of transmission is approximately 12 nanoseconds.
  • the RF pulse is initially received by the receiving antenna a short time, t2, after tl .
  • the time t2 corresponds to the amount of time it takes for the RF pulse to propagate from the transmitting antenna to the receiving antenna.
  • the receiving antenna receives an
  • the RF pulse which is reflected from an object in the range of the transmitted RF pulse is equal to t4 - tl . Based on the amount of time it takes for the RF pulse to be received the distance which the pulse has traveled can be calculated.
  • the high speed gated receiver determines that the leading edge of an RF pulse was received by the RF antenna 20 nanoseconds after it was transmitted by the transmitting antenna, then it can be determined, based on the propagation speed of the RF pulse, that the object is approximately 10 feet from the transmitting and receiving antennas.
  • the transmitting and receiving antennas are located in very close proximity to each other.
  • the above described method of calculating the distance of an object from the transmitting and receiving antennas is based on the idea of using the leading edge of the signal to determine when an RF pulse is transmitted and when it is received.
  • Using the leading edge of the RF pulse does not work well, however, in a situation where the object was located at a very close proximity to the antennas, such as 12 inches from the transmitting and receiving antennas, unless a very short RF pulse is used. For example, in the scenario discussed above a 12 nanosecond pulse was used. If the object was located one foot away from the transmitting antenna the RF pulse would be reflected from the object and received by the receiving antenna about 2 nanoseconds after the starting point of the RF pulse. This type of scenario is shown in Fig. 5.
  • the RF pulse going from the transmitting antenna is shown during the period tl to t3.
  • the main bang occurs from tl+t2 and continues until t3+t2.
  • the RF pulse reflected by the object one foot from the transmitting and receiving antennas is received from time tl+to up until time t3+to.
  • Many prior systems which are keyed to detect pulses based on the leading edge would fail to recognize the existence of an object where the leading edge of the received pulse occurs during the main bang.
  • the prior art systems use a very narrow pulse, so that even if a reflected pulse is received a couple of nanoseconds after the initial transmission of the RF pulse the main bang will have subsided, and the leading edge of the reflected signal can still be easily detected by the receiver.
  • the problem with using the a narrow pulse is that it will result in a signal having a broad frequency bandwidth.
  • the present invention overcomes the problems discussed above by using the trailing edge of the reflected RF pulse to determine the propagation time of the RF pulse, where the reflected pulse overlaps with the main bang. For example the propagation time for Fig.
  • the RF pulse time duration in this case 12 nanoseconds. This calculation establishes the time at which the leading edge of the reflected RF pulse was first detected. Once leading edge of the reflected RF pulse has been determined the propagation time is obtained by subtracting the time at which the leading edge of the RF pulse was transmitted. Once the time period extends to more than two times the length of the
  • the system can utilize the leading edge of the reflected RF pulse.
  • the high speed gated receiver outputs a signal corresponding the entire scanned range at a frequency of 40hz. This means that every 25 milliseconds another range field area worth of information is output by the high speed gated receiver.
  • the high speed gated receiver 140 operates in the manner of a standard digital oscilloscope and is widely understood in the industry as a sample and hold circuit based on an integrator function.
  • Fig. 8 is a detailed schematic showing an embodiment of the low noise amplifier 100, the high speed gated receiver 140, and the match network, and isolation network.
  • the input from the antenna Al is routed through the blocking capacitor C14 and through two low noise amplifiers LAI and LA2.
  • the signal After going through LA2 the signal is transmitted through elements C12 and C6 as well as by resistor RI and a quarter wavelength inductor Gl which is coupled to ground.
  • the purpose for this is to act as a matching network to isolate the 5.8 Ghz signal received by the antenna.
  • the diodes Dl and D2 operate as switching diodes to key the receiver on and off as is known and practiced in typical sample and hold methods.
  • the diodes are keyed on and off by the RX trigger signal which is passed through inverters II and 12.
  • the signal which is keyed on and off by the switching diodes is then routed to the amplifier A2 and output at RX video out.
  • the signal output by the high speed gated receiver is input to a buffer amplifier 170 which matches the output of the receiver with the processing circuitry.
  • the output is then transmitted to a high pass filter 180.
  • the high pass filter 180 reduces the amount of noise in the signal and transmits the signal to the range squared amplifier 190.
  • the range squared amplifier operates to normalize the signals received to account for signal attenuation resulting from propagation losses. For example, a signal which has been reflected off an object 15 feet from the transmitting and receiving antennas will be much smaller than a signal which has been reflected off an object which was 2 feet from the transmitting and receiving antennas.
  • the signal from the range squared amplifier is then transferred through the absolute value circuit 230, the video BW smoothing amplifier 220, the comparator detection control circuit 210 and then to the digital signal processor 160.
  • the digital signal processor is driven by the constant amplitude ramp generator 130 at the same rate as the signal output from the high speed gated receiver.
  • the digital signal processor will be able to identify which signals correspond to a certain amount of propagation delay as the RF signal travels from the transmitting antenna to the receiving antenna.
  • the digital signal processor is can be any of a wide range of simple processors as are widely available. This processor is programmed to operate in accordance with the above described methods to calculate the distance traveled by an RF pulse in the manner described above. While the system could be implement in a number of ways, the system shown in Fig. 1 shows a relatively simple configuration. Specifically, because the scan rate of processor is the same as the output rate of the receiver the processor can easily determine the amount of time that it takes for a signal to travel from the transmitting antenna to the receiving antenna. The digital signal processor is also able to determine if the amount of time that it takes for the RF pulse to travel from the transmitting antenna to the receiving antenna is greater than two times the RF pulse width.
  • the digital signal processor will look to the trailing edge of the initial pulse received by the receiver to determine the travel time of the RF pulse. Based on this travel time, the digital signal processor will determine the distance from the transmitting antenna to the object which has reflected the RF pulse. Where the RF pulse is received at a time greater than two times the pulse width, then the digital signal processor will recognize that its calculations can be based off of the leading edge of the second pulse received by the receiver. Thus the leading edge is used to determine the amount of time it takes from an RF pulse to go from the transmitting to the receiving antenna.
  • Figs. 6 A and 6B Detail of the slotted wave guide antenna employed by one embodiment of the invention is shown in Figs. 6 A and 6B.
  • Fig. 6 A shows an isometric view of the antenna and
  • Fig. 6B shows a plan view of the antenna.
  • the operation of slotted waveguide antennas without signal shaping guides is known by one skilled in the art.
  • the signal shaping guides 602, however, are unique and provide advantages over the prior art.
  • the slotted waveguide antenna 600 with signal shaping guides 602 shown in Figs. 6A and 6B consists of a transmitting antenna 604 and a receiving antenna 606.
  • Figs. 6A and 6B are generally to scale with Wl being approximately 7 inches. The actual dimensions are a matter of routine optimization and design choice.
  • the signal shaping guides allow the shape of the RF pulse to be more accurately and easily controlled than in other antennas, and it eliminates side lobes of RF energy which often result from other antenna designs.
  • the shape of the vertical lobes of a projected RF pulse could be controlled by the dimension and locations of the slots of the slotted array antenna.
  • the shape of the horizontal lobe of the RF pulse could also be affected by the dimension and locations of the slots of the slotted array antenna.
  • the power of the RF pulse be increased so that there would be enough energy focussed in a direction where the system sought to detect objects.
  • the area where objects are sought to be detected is a horizontal range of about 50 degrees form the transmitting antenna.
  • the slotted array antenna signal shaping bodies allows for better control over the shape of the field projected by the antenna.
  • the goal is for an RF pulse with projected energy in the area where objects are sought to be detected.
  • the target design is for a vertical field of approximately 20°. In the horizontal direction, the field of the RF pulse has 50° range.
  • the shaping of the RF lobes in the vertical direction is done by the shaping of the slots 608 of the slotted wave guide antenna as known in the art.
  • the shaping of the RF lobes in the horizontal direction is significantly aided by using the signal shaping guides which are orientated so that the are parallel relative to alignment of the slotted array alignment, and perpendicular to the vertical projection of the RF lobe.
  • the prior art uses a shaping of the slot arrays to affect the field of the prior art slot array antennas, however, it is more difficult to control the shape of the field projected by the antenna and there tends to be more of a vertical lobe on the slot array antenna without the signal shaping guides. These lobes can be reflected off the ground to the receiver which will cause a need for filtering, or for otherwise dealing with this reflection of energy off of the ground.

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  • 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

L'invention concerne un dispositif et un procédé utilisant un signal haute fréquence pour détecter des objets qui sont situés à une distance relativement faible du dispositif de détection. Le signal haute fréquence utilisé peut présenter une durée d'impulsion relativement longue, et nécessite une largeur de bande relativement étroite pour détecter des objets et déterminer la distance approximative séparant l'objet du dispositif de détection. L'utilisation d'une durée d'impulsion longue, d'une faible puissance et de signaux à bande étroite permet de réduire au minimum les possibilités d'interférence avec d'autres signaux.
PCT/US2000/022015 1999-09-10 2000-08-15 Systeme et procede pour radar a courte portee WO2001018559A1 (fr)

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AU69017/00A AU6901700A (en) 1999-09-10 2000-08-15 System and method for short range radar

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US39401099A 1999-09-10 1999-09-10
US09/394,010 1999-09-10

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061912B4 (de) * 2006-12-25 2013-02-28 Fuji Jukogyo Kabushiki Kaisha Pulsradar, fahrzeugmontiertes Radar und Ladungsunterstützungsradar
US9791546B2 (en) 2014-07-31 2017-10-17 Symbol Technologies, Llc Ultrasonic locationing system using a dual phase pulse
FR3056762A1 (fr) * 2016-09-29 2018-03-30 Thales Sa Procede de modulation d'une onde hyperfrequence, systeme d'emission mettant en oeuvre ce procede et radar comportant un tel systeme

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111289951B (zh) * 2020-03-06 2022-03-25 南京长峰航天电子科技有限公司 一种基于最小二乘的宽脉冲等效模拟方法和装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5541612A (en) * 1991-11-29 1996-07-30 Telefonaktiebolaget Lm Ericsson Waveguide antenna which includes a slotted hollow waveguide
US5920277A (en) * 1995-05-11 1999-07-06 Fernau Avionics Ltd Secondary surveillance radar
WO1999042856A2 (fr) * 1998-02-19 1999-08-26 Amerigon Inc. Systeme radar haute performance pour vehicule

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5541612A (en) * 1991-11-29 1996-07-30 Telefonaktiebolaget Lm Ericsson Waveguide antenna which includes a slotted hollow waveguide
US5920277A (en) * 1995-05-11 1999-07-06 Fernau Avionics Ltd Secondary surveillance radar
WO1999042856A2 (fr) * 1998-02-19 1999-08-26 Amerigon Inc. Systeme radar haute performance pour vehicule

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
KEYVAN FOROORAGHI ET AL: "ADMITTANCE OF AN ISOLATED WAVEGUIDE-FED SLOT RADIATING BETWEEN BAFFLES USING A SPECTRUM OF TWO-DIMENSIONAL SOLUTIONS", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION,US,IEEE INC. NEW YORK, vol. 41, no. 4, 1 April 1993 (1993-04-01), pages 422 - 428, XP000372599, ISSN: 0018-926X *
SANGSTER A J ET AL: "BIFURCATED WAVEGUIDE FED BROADWALL SLOTS RADIATING THROUGH A BAFFLE", IEE PROCEEDINGS: MICROWAVES, ANTENNAS AND PROPAGATION,GB,IEE, STEVENAGE, HERTS, vol. 143, no. 6, 1 December 1996 (1996-12-01), pages 465 - 470, XP000677371, ISSN: 1350-2417 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061912B4 (de) * 2006-12-25 2013-02-28 Fuji Jukogyo Kabushiki Kaisha Pulsradar, fahrzeugmontiertes Radar und Ladungsunterstützungsradar
US9791546B2 (en) 2014-07-31 2017-10-17 Symbol Technologies, Llc Ultrasonic locationing system using a dual phase pulse
FR3056762A1 (fr) * 2016-09-29 2018-03-30 Thales Sa Procede de modulation d'une onde hyperfrequence, systeme d'emission mettant en oeuvre ce procede et radar comportant un tel systeme
EP3301471A1 (fr) * 2016-09-29 2018-04-04 Thales Procede de modulation d'une onde hyperfrequence, systeme d'emission mettant en oeuvre ce procede et radar comportant un tel systeme
US10649068B2 (en) 2016-09-29 2020-05-12 Thales Method for modulating a microwave frequency wave, transmission system carrying out this method, and radar comprising a system of this type

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