SE2000154A1 - Doppler-compensated radar interference with interference technology chirp stealer - Google Patents
Doppler-compensated radar interference with interference technology chirp stealerInfo
- Publication number
- SE2000154A1 SE2000154A1 SE2000154A SE2000154A SE2000154A1 SE 2000154 A1 SE2000154 A1 SE 2000154A1 SE 2000154 A SE2000154 A SE 2000154A SE 2000154 A SE2000154 A SE 2000154A SE 2000154 A1 SE2000154 A1 SE 2000154A1
- Authority
- SE
- Sweden
- Prior art keywords
- radar
- frequency
- doppler
- stealer
- chirp
- Prior art date
Links
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- 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
- G01S13/225—Systems for measuring distance only using transmission of interrupted, pulse modulated waves using irregular pulse repetition frequency with cyclic repetition of a non-uniform pulse sequence, e.g. staggered PRF
-
- 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
- G01S7/0232—Avoidance by frequency 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
- 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
- G01S7/38—Jamming means, e.g. producing false echoes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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
Dopplerkompenserad radarstörning med störtekniken chirp stealerSammandragRadar som använder frekvensmodulerad (FM) pulskompression är känslig för störtekniken chirp stealer. Chirp stealer-teknik utnyttjar att det finns en tvetydighet i avstånd och frekvens i FM pulskompressionvågformen. Radarsignaler som frekvensförflyttas kan i radarn komma att betraktas som avståndsförflyttade. Detta gör det möjligt att genom repetering av radarsignalen samt frekvensförflyttning av densamma skapa falska mål mellan en störsändarbärare och en radar, kallat RGPI-störning, även om radarn använder störskydd som frekvenshopp och/eller jittrad PRF. I en FM pulskompressionsradar som mäter doppler kan dock störtekniken avslöjas då dopplerfrekvens inte stämmer överens med målhastigheten som det falska målet har. Föreliggande uppfinning är en metod avsedd för en radarstörsändaranordning. Metoden gör det möjligt att skapa korrekt doppler för falska mål som skapas med störtekniken chirp stealer.Metoden går ut på att normera frekvensförflyttningen så upplösningen på frekvensförflyttningen blir lika med radarns PRF. Normeringen gör så att det falska målet får samma dopplerfrekvens som störsändarbäraren och denna dopplerfrekvens kan sedan frekvensförflyttas dopplerkorrekt om målet ska ges rörelse i avstånd (frekvens).Allmän beskrivning och känd teknikDet är känt att radar som använder frekvensmodulerad (FM) pulskompression är känslig för störtekniken chirp stealer. Chirp stealer-teknik utnyttjar att det finns en tvetydighet i avstånd och frekvens i FM pulskompression-vågformen. Radarsignaler som frekvensförflyttas kan i radarn komma att betraktas som avståndsförflyttade. Detta gör det möjligt att genom repeterad och frekvensförflyttad radarsignal skapa falska mål mellan en störsändarbärare och en radar, kallat RGPI-störning, även om radarn använder störskydd som frekvenshopp och/eller jittrad PRF. I en FM pulskompressionsradar som mäter doppler kan dock störtekniken avslöjas då dopplerfrekvens inte stämmer överens med målhastigheten som det falska målet har. Föreliggande uppfinning är en metod avsedd för en radarstörsändaranordning.Metoden gör det möjligt att skapa korrekt doppler för falska mål som skapas med störtekniken chirp stealer.FigurbeskrivningFigur 1 beskriver flödet för beräkningar som används för att styra fas-/frekvensmodulatorDoppler-compensated radar interference with chirp stealer intercept technologySummary Radar that uses frequency modulated (FM) pulse compression is sensitive to chirp stealer intercept technology. Chirp stealer technology takes advantage of the fact that there is an ambiguity in distance and frequency in the FM pulse compression waveform. Radar signals that are frequency-shifted can in the radar be regarded as distance-shifted. This makes it possible to create false targets between a jammer transmitter carrier and a radar, called RGPI interference, by repeating the radar signal and moving it frequently, even if the radar uses jamming protection as frequency hopping and / or jittered PRF. In an FM pulse compression radar that measures Doppler, however, the crash technique can be revealed as Doppler frequency does not match the target speed that the false target has. The present invention is a method intended for a radar interference transmitter device. The method makes it possible to create the correct Doppler for false targets created with the chirp stealer intercept technique. The method is based on normalizing the frequency shift so that the resolution of the frequency shift is equal to the radar's PRF. The standardization means that the false target has the same Doppler frequency as the jammer transmitter carrier and this Doppler frequency can then be frequency moved Doppler correctly if the target is to be given distance motion (frequency). General description and prior art It is known that radar using frequency modulated (FM) pulse compression chirp stealer. Chirp stealer technology takes advantage of the fact that there is an ambiguity in distance and frequency in the FM pulse compression waveform. Radar signals that are frequency-shifted can in the radar be regarded as distance-shifted. This makes it possible, through repeated and frequency-shifted radar signal, to create false targets between an interfering transmitter carrier and a radar, called RGPI interference, even if the radar uses interference protection such as frequency hopping and / or jittery PRF. In an FM pulse compression radar that measures Doppler, however, the crash technique can be revealed as Doppler frequency does not match the target speed that the false target has. The present invention is a method intended for a radar interference transmitter device. The method makes it possible to create correct Doppler for false targets created with the intercept technique chirp stealer. Figure description Figure 1 describes the flow of calculations used to control phase / frequency modulator
Description
Inkom till Patent ochregistreringsverket 2020 -09- 08Dogglerkomgenserad radarstörning med störtekniken chirp stealer Sammandrag Radar som använder frekvensmodulerad (FM) pulskompression är känslig för störtekniken chirp stealer.Chirp stealer-teknik utnyttjar att det finns en tvetydighet i avstånd och frekvens i FM pulskompression-vågformen. Radarsignaler som frekvensförflyttas kan i radarn komma att betraktas somavståndsförflyttade. Detta gör det möjligt att genom repetering av radarsignalen samtfrekvensförflyttníng av densamma skapa falska mål mellan en störsändarbärare och en radar, kallatRGPI-störning, även om radarn använder störskydd som frekvenshopp och/ellerjittrad PRF. l en FMpulskompressionsradar som mäter doppler kan dock störtekniken avslöjas då dopplerfrekvens intestämmer överens med målhastigheten som det falska målet har. Föreliggande uppfinning är en metodavsedd för en radarstörsändaranordning. Metoden gör det möjligt att skapa korrekt doppler för falskamål som skapas med störtekniken chirp stealer. Received by the Swedish Patent and Registration Office 2020 -09- 08Doggler-combined radar interference with the chirp stealer intercept technology Summary Radar that uses frequency-modulated (FM) pulse compression is sensitive to the chirp stealer intercept technology. Radar signals that are frequency-shifted in the radar can be regarded as distance-shifted. This makes it possible, by repeating the radar signal and frequency displacement thereof, to create false targets between an interfering transmitter carrier and a radar, called RGPI interference, even if the radar uses interference protection such as frequency hopping and / or jittery PRF. In an FM pulse compression radar that measures Doppler, however, the crash technique can be revealed as Doppler frequency intestines correspond to the target speed that the false target has. The present invention is a method intended for a radar interference transmitter device. The method makes it possible to create the correct Doppler for false targets that are created with the chirp stealer technique.
Metoden går ut på att normera frekvensförflyttningen så upplösningen på frekvensförflyttningen blir likamed radarns PRF. Normeringen gör så att det falska målet får samma dopplerfrekvens somstörsändarbäraren och denna dopplerfrekvens kan sedan frekvensförflyttas dopplerkorrekt om målet skages rörelse i avstånd (frekvens). The method is based on normalizing the frequency shift so that the resolution of the frequency shift is equal to the radar's PRF. The standardization means that the false target has the same Doppler frequency as the interference transmitter carrier and this Doppler frequency can then be frequency moved Doppler correctly if the target's movement is distanced (frequency).
Allmän beskrivning och känd teknik Det är känt att radar som använder frekvensmodulerad (FM) pulskompression är känslig för störteknikenchirp stealer. Chirp stealer-teknik utnyttjar att det finns en tvetydighet i avstånd och frekvens i FMpulskompression-vågformen. Radarsignaler som frekvensförflyttas kan i radarn komma att betraktas somavståndsförflyttade. Detta gör det möjligt att genom repeterad och frekvensförflyttad radarsignal skapafalska mål mellan en störsändarbärare och en radar, kallat RGPl-störning, även om radarn använderstörskydd som frekvenshopp och/ellerjittrad PRF. I en FM pulskompressionsradar som mäter dopplerkan dock störtekniken avslöjas då dopplerfrekvens inte stämmer överens med målhastigheten som detfalska målet har. Föreliggande uppfinning är en metod avsedd för en radarstörsändaranordning.Metoden gör det möjligt att skapa korrekt doppler för falska mål som skapas med störtekniken chirpstealer. General Description and Prior Art It is known that radar using frequency modulated (FM) pulse compression is sensitive to the chirp stealer. Chirp stealer technology takes advantage of the ambiguity in distance and frequency in the FM pulse compression waveform. Radar signals that are frequency-shifted in the radar can be regarded as distance-shifted. This makes it possible, through repeated and frequency-shifted radar signal, to create false targets between an interfering transmitter carrier and a radar, called RGP1 interference, even if the radar uses user interference protection such as frequency hopping and / or jittery PRF. In an FM pulse compression radar that measures the Doppler target, however, the crash technique is revealed when the Doppler frequency does not match the target speed that the false target has. The present invention is a method intended for a radar interference transmitter device. The method makes it possible to create accurate Doppler for false targets created with the intercept technique chirpstealer.
Figurbeskrivning Figur 1 beskriver flödet för beräkningar som används för att styra fas-/frekvensmodulator inkom till Patent- ochregistreringsverket 2020 -ÛEI- 08 Specifik beskrivning Metoden går ut på att normera frekvensförflyttningen så upplösningen på frekvensförflyttningen blir likamed radarns PRF. Normeringen gör så att det falska målet får samma dopplerfrekvens somstörsändarbäraren och denna dopplerfrekvens kan sedan frekvensförflyttas dopplerkorrekt om målet skages rörelse i avstånd (frekvens). Detta görs genom att dividera önskad frekvensförflyttning med radarnsPRF, avrunda resultatet till lägsta heltal och därefter multiplicera med radarns PRF. Även andra metoderför att skapa upplösningen radar PRF är förenligt med uppfinningen. Det resulterande frekvensordet styrsedan en analog eller digital fas-/frekvensmodulator som frekvensmodulerar radarsignalen som skarepeteras och användas som störsignal. Figure description Figure 1 describes the flow of calculations used to control the phase / frequency modulator received by the Swedish Patent and Registration Office 2020 -ÛEI- 08 Specific description The method is to normalize the frequency shift so that the resolution of the frequency shift is equal to the radar PRF. The standardization means that the false target has the same Doppler frequency as the interference transmitter carrier and this Doppler frequency can then be frequency moved Doppler correctly if the target's movement is distanced (frequency). This is done by dividing the desired frequency shift with the radar PRF, rounding the result to the lowest integer and then multiplying by the radar PRF. Other methods for creating the radar PRF resolution are also compatible with the invention. The resulting frequency word is then controlled by an analog or digital phase / frequency modulator which frequency modulates the radar signal which is scrambled and used as an interference signal.
För linjär frekvensmodulation med svep låg till hög frekvens kan följande uttryck tecknas förfrekvensförflyttning av en repeterad radarsignal för att skapa ett önskat initialavstånd (sO),initialhastighet (V0) samt acceleration (a): 2 B t2 fo- o ZB + ZB or+"S Pwc Pwc" Pwcaz s0=lnitialavstând v0=|nitialhastighet a=Acceleration i avstånd PW=Pulslängd B=Bandbredd för FM modulationen radarn använderc=Ljushastigheten t=tid Pulslängden PW och bandbredden B mäts in av störsändaranordningen på konventionellt sätt. Metoderför dessa mätningar är kända av fackmannen. f0 benämns avståndsfrekvensoffset. Avståndsfrekvensoffset ska ges upplösningen radar PRF och därefterska hastighetskorrekt dopplerfrekvens fd tillföras enligt: fd=2víc v=Hastighetf=Bä rvågsfrekvensc=Ljushastigheten Bärvågsfrekvensen mäts in av störsändaranordningen på konventionellt sätt. Metoder förfrekvensinmätning är kända av fackmannen. Formeln för avståndsfrekvensoffset är tillämplig för avståndsom motsvarar ungefär i den okomprimerade pulslängden.For linear frequency modulation with low to high frequency sweep, the following expressions can be drawn pre-frequency displacement of a repeated radar signal to create a desired initial distance (sO), initial speed (V0) and acceleration (a): 2 B t2 fo- o ZB + ZB or + "S Pwc Pwc "Pwcaz s0 = initial distance v0 = | initial speed a = Acceleration in distance PW = Pulse length B = Bandwidth for FM modulation the radar usesc = Light speed t = time Pulse length PW and bandwidth B are measured by the jammer transmitter device in a conventional manner. Methods for these measurements are known to those skilled in the art. f0 is called the distance frequency offset. The distance frequency offset must be given the resolution radar PRF and then the speed-correct Doppler frequency fd is applied according to: fd = 2víc v = Speed f = Carrier frequencyc = The speed of light The carrier frequency is measured by the jammer transmitter device in a conventional manner. Methods of pre-frequency measurement are known to those skilled in the art. The formula for the distance frequency offset is applicable for distances corresponding approximately to the uncompressed pulse length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE2000154A SE2000154A1 (en) | 2020-09-08 | 2020-09-08 | Doppler-compensated radar interference with interference technology chirp stealer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE2000154A SE2000154A1 (en) | 2020-09-08 | 2020-09-08 | Doppler-compensated radar interference with interference technology chirp stealer |
Publications (1)
| Publication Number | Publication Date |
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| SE2000154A1 true SE2000154A1 (en) | 2022-03-09 |
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| SE2000154A SE2000154A1 (en) | 2020-09-08 | 2020-09-08 | Doppler-compensated radar interference with interference technology chirp stealer |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5003312A (en) * | 1986-03-28 | 1991-03-26 | Systron Donner Corporation | Velocity deception apparatus and method therefor |
| KR101348548B1 (en) * | 2012-11-09 | 2014-01-16 | 재단법인대구경북과학기술원 | Apparatus for removing radar interference and method thereof |
| WO2016137074A1 (en) * | 2015-02-24 | 2016-09-01 | 양희진 | Radar device and frequency interference cancellation method thereof |
| WO2018063611A1 (en) * | 2016-09-30 | 2018-04-05 | Autoliv Asp, Inc. | Apparatus and method for mitigating interference in an automotive radar system |
| CN105929376B (en) * | 2016-04-25 | 2018-04-24 | 哈尔滨工业大学 | Smart munition noise signal design method based on speed tracting |
| CN108549056A (en) * | 2018-03-16 | 2018-09-18 | 西安电子科技大学 | Missile-borne radar traces into the corner reflector interference echo analogy method after moving target |
-
2020
- 2020-09-08 SE SE2000154A patent/SE2000154A1/en not_active Application Discontinuation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5003312A (en) * | 1986-03-28 | 1991-03-26 | Systron Donner Corporation | Velocity deception apparatus and method therefor |
| KR101348548B1 (en) * | 2012-11-09 | 2014-01-16 | 재단법인대구경북과학기술원 | Apparatus for removing radar interference and method thereof |
| WO2016137074A1 (en) * | 2015-02-24 | 2016-09-01 | 양희진 | Radar device and frequency interference cancellation method thereof |
| CN105929376B (en) * | 2016-04-25 | 2018-04-24 | 哈尔滨工业大学 | Smart munition noise signal design method based on speed tracting |
| WO2018063611A1 (en) * | 2016-09-30 | 2018-04-05 | Autoliv Asp, Inc. | Apparatus and method for mitigating interference in an automotive radar system |
| CN108549056A (en) * | 2018-03-16 | 2018-09-18 | 西安电子科技大学 | Missile-borne radar traces into the corner reflector interference echo analogy method after moving target |
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