GB2268350A - High range resolution radar - Google Patents
High range resolution radar Download PDFInfo
- Publication number
- GB2268350A GB2268350A GB9211179A GB9211179A GB2268350A GB 2268350 A GB2268350 A GB 2268350A GB 9211179 A GB9211179 A GB 9211179A GB 9211179 A GB9211179 A GB 9211179A GB 2268350 A GB2268350 A GB 2268350A
- Authority
- GB
- United Kingdom
- Prior art keywords
- radar sensor
- signals
- transponder
- sensor according
- outward
- 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.)
- Granted
Links
- 230000002596 correlated effect Effects 0.000 claims abstract description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
- G01S7/003—Transmission of data between radar, sonar or lidar systems and remote stations
- G01S7/006—Transmission of data between radar, sonar or lidar systems and remote stations using shared front-end circuitry, e.g. antennas
-
- 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
- G01S13/26—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
-
- 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
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
- G01S13/76—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
- G01S13/765—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted with exchange of information between interrogator and responder
-
- 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
- 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
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
-
- 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
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
- G01S7/0234—Avoidance by code multiplex
-
- 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
- G01S13/88—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
- G01S2013/9316—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles combined with communication equipment with other vehicles or with base stations
-
- 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
- G01S2013/93275—Sensor installation details in the bumper area
-
- 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
- G01S2013/9329—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles cooperating with reflectors or transponders
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The radar includes means for generating ranging signals in the form of a series of pulses by gating 2,3 the output of a microwave source 1 in accordance with the output of PRC generator 6. A sample of the code of the ranging signals is temporarily stored, in variable delay line 7 and return signals from a target are correlated with the code to sense targets at a particular range. Doppler processing is also possible. A transponder may be mounted at the roadside or another vehicle, thereby allowing communication between the radar and transponder. <IMAGE>
Description
Hiah Range Resolution Radar
The present invention relates to radar apparatus suitable for use in connection with automobiles, and in particular to a high range resolution pulse doppler radar sensor which can be fitted to automobiles in order to provide facilities such as, a collision avoidance and/or station-keeping capability, the ability to interrogate transponder and the ability to communicate wth transponding vehicles and roadside communication systems.
The facilities referred to above have great importance in such areas as promoting road safety, road pricing, and monitoring the movements of special vehicles. In the past, the use of radar based systems for such purposes has been hindered by the size and cost of existing radar equipment.
It is an object of the present invention to provide a radar sensor which is small in size, light in weight and low in cost so that it is suitable for use with automobiles.
According to the present invention there is provided a radar sensor, comprising means for generating outward signals in the form of a gated series of pulses embodying a sequence of digital elements having first and second phases, means for storing temporarily a sample of the outward signals and means for correlating return signals from a target with the stored sample of the outward signals.
Preferably, the sequence of ditigal elements is generated by a bi-stable circuit under the control of pulses generated by a pseudo-random signal generator.
The temporary store for the sample of the code of the transmitted signals may be a delay circuit and the storage time may be equal to the go-and-return time for a given target. The length of the delay may be made to be variable so that targets can be tracked in range or so as to perform a range surveillance function.
The invention will now be described, by way of example with reference to the accompanying drawing which is a block circuit diagram of an automobile radar sensor embodying the invention.
Referring to the drawing, an automobile radar sensor comprises a microwave source 1, an AND gate 2, an exclusive OR gate 3, a D-type flip-flop bi-stable circuit 4, a radiating antenna 5, a pseudo-random code generator 6, a delay line 7, a timing control circuit 8, a quadrature mixer 9, a receiving antenna 10, a filter 11, two amplifiers 12 and 13 and associated filters 14 and 15, respectively, a further pair of amplifiers 16 and 17, a correlator 18 and a signal processor 19.
The microwave source 1 produces an output signal at a frequency of 5.8 GHz, which is applied to one terminal of the AND gate and a clock input terminal Cl of the flip-flop circuit 4. Timing pulses are applied from the timing control circuit 8 to the other input terminal of the AND gate 2. Signals from the code generator 6 are applied to the D terminal of the flip-flop circuit 4 and to the delay line 7. The output from the Q terminal of the flip-flop circuit 4 is a synchronous version of the signal applied to the D-terminal of the flip flop circuit 4, which is applied to one input terminal of the exclusive OR gate 3. The output from the AND gate 2 is applied to the other input terminal o the exclusive OR gate 3.The output from the exclusive OR gate 3 is applied to the radiating antenna 5 and to the in-phase side of the quadrature mixer 9.
The action of the exclusive OR gate 3 is such that when the output from the flip-flop circuit 4 is high, the
RF output from the exclusive OR gate 3 is inverted, and when the output from the flip-flop circuit 4 is low, the
RF output from the exclusive OR gate 3 remains the same.
Therefore the signal radiated from the antenna 5 is a gated phase-coded pulse of microwave energy which propogates to a target (not shown) and at some time later returns to be picked up by the receiving antenna 10.
After filtration, the return signals are applied to the quadrature mixer 9. The range over which the system is used is such that the transmitting side of the sensor is still operating when return signals arrive at the antenna 10. Hence both outward and return signals are mixed in the mixer 9, to produce a baseband replica of the coded signals. The output signals from the mixer 9 are amplified by the amplifier 12 and 13, filtered in the filters 14 and 15 and amplified again by the amplifiers 16 and 17 before being applied to the correlator 18.
The code used for the transmitted signal is stored in the delay line 7 for a time approximately equal to the expected go-and-return time of the target. It is then applied to the correlator 18 in which it is used as a template. If the target go-and-return time equals the range track delay time, the code on the I and Q outputs from the mixer 9 will match exactly the stored code and a strong correlation between the signals from the mixer 9 and the stored code will be noted. Return signals from targets in adjacent range gates, which have different goand-return times will not correlate strongly and will be rejected by the correlator 18. Therefore the system described achieves a range resolution equivalent to the code bandwidth with good suppression of adjacent range bins.The correlated output signals from the correlator 18 are modulated by cyclic phase shifting caused by the
Doppler effect. The signal processer 19 operates upon the output from the correlator 18 to analyse the doppler signature of targets within a current range gate.
The length of the delay line 7 containing the stored code may be changed by means of conventional logic circuits. By so doing, targets can be tracked in range, or range surveillance can be carried out. If it is desired to operate more than one radar simultaneously in close proximity, discrimination between the radars can be provided by the use of different codes in each radar, thus enabling them to operate at the same frequency and so eliminating the need for frequency planning.
The use of a correlation signal processing system and phase coding allows a low peak power transmitter to be used, while maintaining a high degree of range resolution.
When used for automobile sensing purposes, it is desirable that the antennas 5 and 10 should be mounted at standardised heights - a suitable arrangement being in slots in a moulded bumper although other arrangements can be used. A single, central radiating antenna so mounted would produce a beam with a beam width of about 300 in elevation and between 100 to 300in azimuth. This can be increased by using more than one radiating antenna symmetrically disposed in relation to the longitudinal axis of the automobile.
The radar sensor described can be used in association with a transponder such as that described in our co-pending application of even date to communicate with a vehicle, or to enable one vehicle to communicate with another or a roadside installation. For this to be done, the doppler bandwidth of the sensor has to be greater than that required merely to detect mobile targets. By using standard fast Fourier transform techniques, it is possible to analyse bandwidths well in excess of that of the radar transmissions. Returns from the transponders can be arranged to have frequencies which fall in otherwise unused doppler bins. Particular frequency ranges can be used to identify particular parts of coded transmissions from the transponders. The signals from the transponders are detected in the same way as returns from targets, with the same resolution in range and doppler offsets. The signal processor 19 can be made to identify particular transponders together with their range and velocity, if desired. The transponder signal codes can be used to provide communication between an interrogating radar sensor and a target to which the transponder is attached. For example information can be conveyed from one vehicle to another to enable a predetermined distance to be maintained between them or to provide information about acceleration, braking or turning.
The radar sensor described also can be used to interrogate roadside transponders adapted to provide information about hazards, speed restrictions or route guidance.
Claims (13)
1. A radar sensor, comprising means for generating outward signals in the form of a gated series of pulses embodying a sequence of digital elements having first and second phases, means for storing temporarily a sample of the outward signals and means for correlating return signals from a target with the stored sample of the outward signals.
2. A radar sensor according to Claim 1 wherein the series of digital elements having first and second phases is generated by a bi-stable circuit under the control of a pseudo-random code signal generator.
3. A radar sensor according to Claim 2 wherein there is included means for generating control timing signals, an
AND gate to one input terminal of which the control timing signals are applied, a source of microwave signals which are applied to the other input terminal of the AND gate and to a clock terminal of the bi-stable circuit, the output signals from the pseudo-random code signal generator being applied to another terminal of the bistable circuit and an exclusive OR gate to which the outputs from the AND gate and the bi-stable circuit are applied.
4. A radar sensor according to any of Claims 1 to 3 wherein the means for storing temporarily a sample of the outward signals is a delay line.
5. A radar sensor according to Claim 4 wherein the time for which the sample of the outward signals is stored is adapted to be equal to the time taken for the outward signals to travel from the sensor to a target at a predetermined range and return to the sensor.
6. A radar sensor according to Claim 5 or Claim 6 wherein the delay time of the delay line is variable.
7. A radar sensor according to any of Claims 1 to 6 wherein the outward signals and return signals are mixed in a quadrature mixer the outputs from which are correlated with appropriate components of the temporarily stored sample of the pseudo-random code of the outward signals.
8. A radar sensor according to any of Claims 1 to 7 wherein there is included means for processing output signals from the correlator to provide information relating to the doppler signature of targets.
9. A radar sensor according to any of Claims 1 to 8 wherein the pseudo-random code signal generator is adapted to provide different codes to a plurality of radar sensors according to any preceding claim.
10. A radar sensor according to any preceding claim in association with a transponder adapted to react to transmissions from the radar sensor.
11. A radar sensor and transponder according to Claim 11 wherein the transponder is adapted to provide information relating to the operation of a vehicle to which the transponder is attached.
12. A radar sensor and transponder according to Claim 11 wherein the transponder is attached to a roadside installation and is adapted to provide information to a vehicle to which the radar sensor is attached.
13. A radar sensor substantially as hereinbefore described and with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9211179A GB2268350B (en) | 1992-05-27 | 1992-05-27 | High range resolution radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9211179A GB2268350B (en) | 1992-05-27 | 1992-05-27 | High range resolution radar |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9211179D0 GB9211179D0 (en) | 1992-07-15 |
| GB2268350A true GB2268350A (en) | 1994-01-05 |
| GB2268350B GB2268350B (en) | 1995-10-25 |
Family
ID=10716065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9211179A Expired - Fee Related GB2268350B (en) | 1992-05-27 | 1992-05-27 | High range resolution radar |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2268350B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0671635A1 (en) * | 1994-03-10 | 1995-09-13 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" | Method and apparatus for transmission and RF positioning with multiple access using spread sprectrum technique |
| EP0638871A3 (en) * | 1993-08-05 | 1995-12-13 | Sel Alcatel Ag | Device for recognizing and reading mobile transponders relating to this device. |
| WO1996000910A1 (en) * | 1994-06-30 | 1996-01-11 | Ehsani Engineering Enterprises Inc. | System and method for radar-vision for vehicles in traffic |
| WO1996002853A3 (en) * | 1994-07-15 | 1996-03-14 | Design Tech & Innovation Ltd | Safety system for vehicles |
| EP1553428A3 (en) * | 2004-01-09 | 2005-08-17 | Fujitsu Ten Limited | Radar |
| GB2415560A (en) * | 2004-06-25 | 2005-12-28 | Instro Prec Ltd | Vehicle safety system having a combined range finding means and a communication means |
| WO2010041154A3 (en) * | 2008-05-28 | 2010-08-26 | Anthony Richards | Ranging device and method for wireless radio frequency communication |
| EP4148452A1 (en) * | 2021-09-10 | 2023-03-15 | Nxp B.V. | A radar system and a radar method for replay resistant radar operations |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1432541A (en) * | 1972-05-30 | 1976-04-22 | Secr Defence | Phase modulation apparatus |
| US3955197A (en) * | 1966-01-03 | 1976-05-04 | International Telephone And Telegraph Corporation | Impulse correlation function generator |
| GB1571861A (en) * | 1977-01-10 | 1980-07-23 | Sanders Associates Inc | Search radar |
| US4216472A (en) * | 1973-08-30 | 1980-08-05 | International Telephone And Telegraph Corporation | Gated pseudonoise semi-active missile guidance system with improved illuminator leakage rejection |
| US4833479A (en) * | 1988-03-21 | 1989-05-23 | Motorola, Inc. | Digital poly-phase pulse compressor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4813006A (en) * | 1987-06-29 | 1989-03-14 | Hughes Aircraft Company | Analog-digital correlator |
| JP2994030B2 (en) * | 1988-12-20 | 1999-12-27 | レイセオン・カンパニー | Digital range correlator |
| JP2835789B2 (en) * | 1991-06-10 | 1998-12-14 | 富士通株式会社 | Pulse compression control method |
-
1992
- 1992-05-27 GB GB9211179A patent/GB2268350B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3955197A (en) * | 1966-01-03 | 1976-05-04 | International Telephone And Telegraph Corporation | Impulse correlation function generator |
| GB1432541A (en) * | 1972-05-30 | 1976-04-22 | Secr Defence | Phase modulation apparatus |
| US4216472A (en) * | 1973-08-30 | 1980-08-05 | International Telephone And Telegraph Corporation | Gated pseudonoise semi-active missile guidance system with improved illuminator leakage rejection |
| GB1571861A (en) * | 1977-01-10 | 1980-07-23 | Sanders Associates Inc | Search radar |
| US4833479A (en) * | 1988-03-21 | 1989-05-23 | Motorola, Inc. | Digital poly-phase pulse compressor |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0638871A3 (en) * | 1993-08-05 | 1995-12-13 | Sel Alcatel Ag | Device for recognizing and reading mobile transponders relating to this device. |
| EP0671635A1 (en) * | 1994-03-10 | 1995-09-13 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" | Method and apparatus for transmission and RF positioning with multiple access using spread sprectrum technique |
| FR2717328A1 (en) * | 1994-03-10 | 1995-09-15 | Snecma | Method and device for multiple access transmission and radiolocation using spread spectrum |
| WO1996000910A1 (en) * | 1994-06-30 | 1996-01-11 | Ehsani Engineering Enterprises Inc. | System and method for radar-vision for vehicles in traffic |
| EP1122555A1 (en) * | 1994-06-30 | 2001-08-08 | Ehsani Engineering Enterprises Inc. | System and method for radar-vision for vehicles in traffic |
| WO1996002853A3 (en) * | 1994-07-15 | 1996-03-14 | Design Tech & Innovation Ltd | Safety system for vehicles |
| EP1553428A3 (en) * | 2004-01-09 | 2005-08-17 | Fujitsu Ten Limited | Radar |
| US7138939B2 (en) | 2004-01-09 | 2006-11-21 | Fujitsu Ten Limited | Radar |
| GB2415560A (en) * | 2004-06-25 | 2005-12-28 | Instro Prec Ltd | Vehicle safety system having a combined range finding means and a communication means |
| WO2010041154A3 (en) * | 2008-05-28 | 2010-08-26 | Anthony Richards | Ranging device and method for wireless radio frequency communication |
| EP4148452A1 (en) * | 2021-09-10 | 2023-03-15 | Nxp B.V. | A radar system and a radar method for replay resistant radar operations |
| US12379457B2 (en) | 2021-09-10 | 2025-08-05 | Nxp B.V. | Radar system and a radar method for replay resistant radar operations |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2268350B (en) | 1995-10-25 |
| GB9211179D0 (en) | 1992-07-15 |
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