Method and system for locating a target in an interrogation-response system (IFF)
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01S-013/78
G01S-013/44
출원번호
US-0142724
(2009-12-11)
등록번호
US-8441392
(2013-05-14)
우선권정보
FR-08 07492 (2008-12-30)
국제출원번호
PCT/EP2009/066987
(2009-12-11)
§371/§102 date
20110824
(20110824)
국제공개번호
WO2010/076161
(2010-07-08)
발명자
/ 주소
Descharles, Cyril
Triconnet, Thierry
출원인 / 주소
Thales
대리인 / 주소
Baker Hostetler LLP
인용정보
피인용 횟수 :
1인용 특허 :
7
초록▼
A method and system for locating a target, of azimuth Aestimatedtarget and of elevation angle Sestimatedtarget, in space by a carrier uses at least one first antenna array with electronic scanning ARRAY_H and at least one second antenna array with electronic scanning ARRAY_B. The target emits a sign
A method and system for locating a target, of azimuth Aestimatedtarget and of elevation angle Sestimatedtarget, in space by a carrier uses at least one first antenna array with electronic scanning ARRAY_H and at least one second antenna array with electronic scanning ARRAY_B. The target emits a signal in response to an interrogation from the carrier, each of said antenna arrays includes at least one antenna and the total number of antennas used is at least equal to three.
대표청구항▼
1. A method for locating in space, from a carrier, a target of azimuth Aestimatedtarget and of elevation angle Sestimatedtarget using at least one first linear antenna array with electronic scanning ARRAY_H comprising at least one individual antenna and at least one second linear antenna array with
1. A method for locating in space, from a carrier, a target of azimuth Aestimatedtarget and of elevation angle Sestimatedtarget using at least one first linear antenna array with electronic scanning ARRAY_H comprising at least one individual antenna and at least one second linear antenna array with electronic scanning ARRAY_B comprising at least two individual antennas, said target emitting a signal in response to an interrogation from the carrier, the method comprising: step 1: creating a third combined linear antenna array ARRAY_C by coupling at least one individual antenna of the antenna array ARRAY_H and at least one individual antenna of the antenna array ARRAY_B,step 2: determining the monopulse angle ΨRxH(A,S) or ΨRxB(A,S), so as to define a first response acceptance zone ZAR1, by a measurement on the signal emitted by the target and received on one of the antenna arrays ARRAY_H or ARRAY_B, with A and S being the potential azimuth and elevation angle values of said target,step 3: determining the monopulse angle ΨRxC(A,S), so as to define a second response acceptance zone ZAR2, by a measurement on the signal emitted by the target and received on the combined antenna array ARRAY_C, said zone being formed by one or more windows in the plane (A,S),step 4: forming, from at least the information items ΨRxH(A,S) and ΨRxC(A,S) or ΨRxB(A,S) and ΨRxC(A,S), a third response acceptance zone ZAR3 equal to the intersection of the two zones ZAR1 and ZAR2 defined previously and making it possible to locate the target from its coordinates (Aestimatedtarget, Sestimatedtarget). 2. The method according to claim 1, further comprising: step 5: forming a fourth response acceptance zone ZAR4 by eliminating the secondary windows from the zone ZAR2 by comparison of the signal level received on the antenna array ARRAY_H with that received on the antenna array ARRAY_B via an amplitude discrimination method. 3. The method according to claim 1, further comprising: step 6: accurately determining a measurement of the elevation angle Sestimatedtarget of the target based on the monopulse angles (ΨRxK(A,S) ΨRxC(A,S)), in which k is to be replaced by B or H, using the following equation: Sestimatedtarget=[a(Air,Sir)C·b(Air,Sir)k(ΨRxk(A,S))+b(Air,Sir)C(ΨRxC(A,S))][1-a(Air,Sir)C·a(Air,Sir)k]in which a(Air,Sir)k and a(Air,Sir)c are parameters dependent on the direction of pointing of the antennas which are calculated on the basis of the patterns of said individual antennas respectively used to form the antenna array ARRAY_H (or ARRAY_B) and the antenna array ARRAY_C,in which b(Air,Sir)k (ΨRxK(A,S)) are obtained by a polynomial modeling of the trend of the monopulse angle as a function of the azimuth for a fixed elevation angle value, or as a function of the elevation angle for a fixed azimuth value, with k=H, B or C. 4. The method according to claim 1, further comprising: step 7: accurately determining a measurement of the azimuth Aestimatedtarget of the target based on the monopulse angles (ΨRxK(A,S), ΨRxC(A,S)) and on a measurement of the elevation angle Sestimatedtarget of the target, in which k is to be replaced by B or H, using the following equation: Aestimatedtarget=a(Air,Sir)kSestimatedtarget+b(Air,Sir)k(ΨRxk(A,S))in which a(Air,Sir)k are parameters dependent on the direction of pointing of the antennas and calculated on the basis of the patterns of said individual antennas used to form the antenna arrays ARRAY_H or ARRAY_B ,in which b(Air,Sir)k(ΨRxk(A,S)) are parameters obtained by a polynomial modeling of the trend of the monopulse angle as a function of the azimuth for a fixed elevation angle value, or as a function of the elevation angle for a fixed azimuth value, with k=B or H. 5. The method according to claim 1, wherein the antenna arrays ARRAY_H and ARRAY_B are located on the nose cone of said carrier and that the antenna array ARRAY_H is located vertically to the antenna array ARRAY_B. 6. The method according to claim 1, wherein the interrogation mode from the carrier to the target is an identification friend or foe (IFF) mode. 7. A system for locating a target by a carrier equipped with a primary radar and a secondary radar, the system comprising: an interrogation-response system which comprises at least a first antenna array a second antenna array, a switching matrix, a beam combiner, a receiver and a computer suitable for implementing the characteristics of the elevation angle and azimuth locating method according to claim 1.
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이 특허에 인용된 특허 (7)
Moss Leonard A., Adaptive azimuth processing for monopulse IFF interrogators.
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