Doppler-compensated radar pulse compression processing system and method
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01S-013/90
G01S-013/00
출원번호
US-0626931
(2007-01-25)
등록번호
US-7439906
(2008-10-21)
발명자
/ 주소
Blunt,Shannon D
Gerlach,Karl R
Smith,Kevin J
출원인 / 주소
The United States of America as represented by the Secretary of the Navy
대리인 / 주소
Karasek,John J.
인용정보
피인용 횟수 :
5인용 특허 :
3
초록▼
A radar receiver system includes a receiver, a processor including a Doppler Compensated Adaptive Pulse Compressor (DCAPC) algorithm, possible other intermediate processing and a target detector. The DCAPC algorithm processes samples of a radar return signal, applies Minimum Mean Square Error (MMSE
A radar receiver system includes a receiver, a processor including a Doppler Compensated Adaptive Pulse Compressor (DCAPC) algorithm, possible other intermediate processing and a target detector. The DCAPC algorithm processes samples of a radar return signal, applies Minimum Mean Square Error (MMSE), or alternatively matched filtering, to the radar return signal to obtain initial radar impulse response estimates, computes power estimates, estimates a range cell Doppler shift for each range cell, computes range-dependent filters, applies the MMSE filters, and then repeats the cycle for subsequent reiterative stages until a desired length-L range window is reached, thereby resolving the scatterer from noise and other scatterers.
대표청구항▼
We claim: 1. A method for processing a received radar pulse from a moving target, comprising: a) receiving a return signal; b) obtaining L+(2M-1 (N-1) samples y of the return signal, where y(Λ)={tilde over (x)}T(Λ)s+v(Λ): c) applying Minimum Mean Square Error (MMSE) estimation to eac
We claim: 1. A method for processing a received radar pulse from a moving target, comprising: a) receiving a return signal; b) obtaining L+(2M-1 (N-1) samples y of the return signal, where y(Λ)={tilde over (x)}T(Λ)s+v(Λ): c) applying Minimum Mean Square Error (MMSE) estimation to each successive N samples to obtain initial impulse response estimates [{circumflex over (x)}1{-(M-1)(N-1)}, . . . , {circumflex over (x)}1{-1}, {circumflex over (x)}1{0}, . . . , {circumflex over (x)}1{L-1}, {circumflex over (x)}1{L}, . . . , {circumflex over (x)}1{L-1+(M-1)(N-1)}]; d) computing power estimates {circumflex over (ρ)}1(Λ)=|{circumflex over (x)}1(Λ)|2 for Λ=-(M-1)(N-1), . . . , L-1+(M-1)(N-1); e) estimating a range cell Doppler shift for each range cell magnitude estimate above a user-selected threshold; f) computing MMSE filters according to w(Λ)=ρ(Λ)({tilde over (C)}(Λ)+R)-1[s∘e(Λ], where ρ(Λ)=|x(Λ)|2 is the power of x(Λ), R=E[v(Λ) vH (Λ)] is the noise covariance matrix, and the range cell Doppler shifts are inserted; g) applying the MMSE filters to y to obtain [{circumflex over (x)}2{-(M-2)(N-1)}, . . . , {circumflex over (x)}2{-1},{circumflex over (x)}20}, . . . , {circumflex over (x)}2(L-1}, {circumflex over (x)}2{L}, . . . , {circumflex over (x)}2{L-1+(M-2)(N-1)}]; and h) repeating (e)-(g) for subsequent reiterative stages until a desired length-L range window is reached, thereby resolving the scatterers from noise and other scatterers. 2. A method as in claim 1, wherein the MMSE estimation is performed with a plurality of parallel processors. 3. A method as in claim 1, further comprising setting a nominal level for which the power estimates ρ(Λ)=|x(Λ)|2 are not allowed to fall below. 4. A method as in claim 1, wherein the y samples are obtained via analog/digital (A/D) conversion. 5. A method as in claim 1, wherein the method is applied in range profiling. 6. A method as in claim 1, wherein the method is applied for synthetic Aperture Radar (SAR). 7. A method as in claim 1, wherein the method is applied for Inverse SAR (ISAR). 8. A method as in claim 1, wherein the Doppler shift is determined from the equation description="In-line Formulae" end="lead"g(Λ)=BMFHy (Λ),description="In-line Formulae" end="tail" in which with sm=[sm . . . sN-M-m-1]T where m=0,1, . . . ,M for Mε[1, 2, . . . , N-1], and the Doppler phase shift θΛ is then estimated as where gm(Λ) is the mth element of g(Λ) and ∠[•] is the angle of the complex value of the argument. 9. A method is in claim 1, wherein the Doppler shift is determined from the equation description="In-line Formulae" end="lead"g(Λ)=BMMSEHy (Λ)description="In-line Formulae" end="tail" in which the mth MMSE sub-filter wm(Λ) of length N-M is computed according to description="In-line Formulae" end="lead" wm(Λ)=ρ(Λ)({tilde over (C)}m(Λ)+ R)-1 smdescription="In-line Formulae" end="tail" where R is an (N-M��(N-M) principal submatrix of R, and the (N-M)��(N-M) matrix Cm(Λ) is the (m+1)m principal submatrix of and the Doppler base shift θΛ is then estimated as where gm(Λ) is the mth element of g(Λ) and ∠[•] is the angle of the complex value of the argument. 10. A method as in claim 1, wherein the Doppler shift is determined from the equation description="In-line Formulae" end="lead"g(Λ)=BMFHy (Λ),description="In-line Formulae" end="tail" in which with sm=[sm . . . sN-M-m-1]T where m=0,1, . . . , M for Mε[1, 2, . . . , N-1], and the Doppler phase shift θΛ is then estimated as where gm(Λ) is the mth element of g(Λ) and ∠[•] is the angle of the complex value of the argument. 11. A method as in claim 1, wherein the Doppler shift is determined from the equation description="In-line Formulae" end="lead"g(Λ) =BMMSEHy(Λ),description="In-line Formulae" end="tail" in which the mth MMSE sub-filter wm(Λ) of length N-M is computed according to description="In-line Formulae" end="lead" wm(Λ)=ρ(Λ) ({tilde over (C)}m(Λ)+ R)-1 smdescription="In-line Formulae" end="tail" where R is an (N-M)��(N-M) principal submatrix of R, and the (N-M)��(N-M) matrix Cm(Λ) is the (m+1)st principal submatrix of and the Doppler phase shift θΛ is then estimated as where gm(Λ) is the mth element of g(Λ) and ∠[•] is the angle of the complex value of the argument. 12. A radar system, comprising: a receiver; a processor including a Doppler Compensated Adaptive Pulse Compressor (DCAPC) algorithm; and a target detector. 13. A radar system as in claim 12, further comprising a transmitter for transmitting an initial radar signal toward a target. 14. A radar system as in claim 12, wherein the DCAPC algorithm comprises: a) obtaining L+(2M-1)(N-1) samples y of a radar return signal, where y(Λ)={tilde over (x)}T(Λ)s+v(Λ); b) applying Minimum Mean Square Error (MMSE) pulse compression to the radar return signal y to obtain initial radar impulse response estimates [{circumflex over (x)}1{-(M-1)(N-1)}, . . . , {circumflex over (x)}1{-1}, {circumflex over (x)}1{0}, . . . , {circumflex over (x)}1{L-1}, {circumflex over (x)}1{L}, . . . , {circumflex over (x)}1{L-1+(M-1)(N-1)}]; c) computing power estimates {circumflex over (ρ)}1(Λ)=|{circumflex over (x)}1(Λ)|2 for Λ=-(M-1)(N-1), . . . , L-1+(M-1)(N-1); d) estimating a range cell Doppler shift for each range cell; e) computing range-dependent filters according to w(Λ)=ρ(Λ) ({tilde over (C)}(Λ)+R)-1[s∘e(Λ)], where ρ(Λ)=|x(Λ)|2 is the power of x(Λ), and R=E[v(Λ) vH(Λ)| is the noise covariance matrix, and the range cell Doppler shifts are inserted; f) applying the MMSE filters to y to obtain [{circumflex over (x)}2{-(M-2)(N-1)}, . . . , {circumflex over (x)}2{-1}, {circumflex over (x)}2{0}, . . . {circumflex over (x)}2(L-1), {circumflex over (x)}2{L}, . . . , {circumflex over (x)}2(L-1+(M-2)(N-1)}]; and g) repeating (c)-(f) for subsequent reiterative stages until a desired length-L range window is reached, thereby resolving the scatterer from noise and other scatterers. 15. A radar system as in claim 14, further comprising a plurality of parallel processors for performing the MMSE pulse compression. 16. A radar system as in claim 14, wherein a nominal level is set for which the power estimates are not allowed to fall below. 17. A radar system as in claim 12, further comprising an analog-to-digital (A/D) converter. 18. A radar system as in claim 12, wherein the DCAPC algorithm comprises: a) obtaining L+(2M-1)(N-1) samples y of a radar return signal, where y(Λ)={tilde over (x)}T(Λ)s+v(Λ); b) applying matched filtering to the radar return signal y to obtain initial radar impulse response estimates [{circumflex over (x)}1{-(M-1)(N-1)}, . . . , {circumflex over (x)}1{-1}, {circumflex over (x)}1{0}, . . . {circumflex over (x)}1{L-1}, {circumflex over (x)}1{L}, . . . , {circumflex over (x)}1{L-1+(M-1)(N-1)}]; c) computing power estimates {circumflex over (ρ)}1(Λ)=|{circumflex over (x)}1(Λ)|2 for Λ=-(M-1)(N-1), . . . , L-1+(M-1(N-1); d) estimating a range cell Doppler shift for each range cell; e) computing range-dependent filters according to w(Λ)=ρ(Λ) ({tilde over (C)}(Λ)+R)-1[s∘e(Λ)], where ρ(Λ)=|x(Λ)|2 is the power of x(Λ), and R=E[v(Λ) vH(Λ)] is the noise covariance matrix, and the range cell Doppler shifts are inserted; f) applying the MMSE filters to y to obtain [{circumflex over (x)}2{-(M-2)(N-1)}, . . . , {circumflex over (x)}2-1}, {circumflex over (x)}2{0], . . . , {circumflex over (x)}2(L-1), {circumflex over (x)}2{L}, . . . , {circumflex over (x)}2{L-1+(M-2)(N-1)}]; and g) repeating (c)-(f) for subsequent reiterative stages until a desired length-L range window is reached, thereby resolving the scatterer from noise and other scatterers. 19. A radar system as in claim 18, further comprising a plurality of parallel processors for performing the MMSE pulse compression. 20. A radar system as in claim 18, wherein a nominal level is set for which the power estimates are not allowed to fall below. 21. A method for processing a received radar pulse from a moving target, comprising: a) obtaining L+(2M-1)(N-1) samples y of a radar return signal, where y(Λ)={tilde over (x)}T(Λ)s+v(Λ); b) applying matched filtering to the radar return signal y to obtain initial radar impulse response estimates [{circumflex over (x)}1{-(M-1)(N-1)}, . . . , {circumflex over (x)}1{-1}. . . {circumflex over (x)}1{0}, . . . , {circumflex over (x)}1{L-1}, {circumflex over (x)}1{L}, . . . {circumflex over (x)}1{L-1+(M-1)(N-1)}]; c) computing power estimates {circumflex over (ρ)}1(Λ)=|{circumflex over (x)}1(Λ)|2 for Λ=-(M-1)(N-1), . . . , L-1+(M-1)(N-1); d) estimating a range cell Doppler shift for each range cell; e) computing range-dependent filters according to w(Λ)=ρ(Λ)({tilde over (C)}(Λ)+R)-1[s∘e(Λ)], where ρ(Λ) =|x(Λ)|2 is the power of x(Λ), and R=E[v(Λ) vH(Λ)] is the noise covariance matrix, and the range cell Doppler shifts are inserted; f) applying the MMSE filters to y to obtain [{circumflex over (x)}2{-(M-2)(N-1)}, . . . , {circumflex over (x)}2{-1}, {circumflex over (x)}2{0}, . . ., {circumflex over (x)}2{L-1}, {circumflex over (x)}2{L}, . . . , {circumflex over (x)}2{L-1+(M-2)(N-1)}]; and g) repeating (c)-(f) for subsequent reiterative stages until a desired length-L range window is reached, thereby resolving the scatterer from noise and other scatterers.
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이 특허에 인용된 특허 (3)
Burkhardt Phillip E., Pulse compressor for doppler tolerant radar.
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