An improved approach to direction finding using a super delta monopulse beamformer is disclosed. A super delta channel signal that includes direction finding information from two circular delta channels is formed and output by the super delta monopulse beamformer. This super delta channel signal use
An improved approach to direction finding using a super delta monopulse beamformer is disclosed. A super delta channel signal that includes direction finding information from two circular delta channels is formed and output by the super delta monopulse beamformer. This super delta channel signal uses only two channels, but is able to realize the accuracy of conventional three channel systems.
대표청구항▼
1. A method, comprising: forming, by an analog beamformer, a super delta channel signal; andoutputting, by the analog beamformer, the super delta channel signal. 2. The method of claim 1, further comprising: combining, by the analog beamformer, a conjugation of a first independent circular delta cha
1. A method, comprising: forming, by an analog beamformer, a super delta channel signal; andoutputting, by the analog beamformer, the super delta channel signal. 2. The method of claim 1, further comprising: combining, by the analog beamformer, a conjugation of a first independent circular delta channel signal with a sum signal to form a first combined signal that serves as a minuend of the super delta channel signal. 3. The method of claim 2, further comprising: combining, by the analog beamformer, a second independent circular delta channel signal with a conjugation of the sum signal to form a second combined signal that serves as a subtrahend of the super delta channel signal. 4. The method of claim 3, wherein the sum signal Σ, the first independent circular delta channel Δ1, and the second independent circular delta channel Δ2 are represented by [ΣΔ1Δ2]=[11111j-1-j1-j-1j][ABCD]where j is an imaginary number √{square root over (−1)}, and A is a lower left quadrant, B is a lower right quadrant, C is an upper right quadrant, and D is an upper left quadrant, respectively, of an aperture. 5. The method of claim 3, further comprising: subtracting, by the analog beamformer, the second combined signal from the first combined signal to form the super delta channel signal. 6. The method of claim 3, wherein a direction finding signal-to-noise ratio (SNR) of the super delta channel signal is 3 decibels larger than a SNR of the first independent circular delta channel signal and the second independent circular delta channel signal. 7. The method of claim 1, wherein the analog beamformer using the super delta channel signal and a sum signal of four aperture quadrants has an accuracy of a three channel system using an azimuth delta, an elevation delta, and the sum signal of the four aperture quadrants. 8. An apparatus, comprising: a plurality of conjugation components; andat least two mixers, whereinthe plurality of conjugation components and the at least two mixers are configured to produce a super delta channel signal. 9. The apparatus of claim 8, wherein at least one of the plurality of conjugation components is configured to output a conjugation of an independent circular delta channel. 10. The apparatus of claim 8, wherein the at least two mixers comprise: a first mixer configured to combine a conjugation of a first independent circular delta channel signal with a sum signal to form a first combined signal; anda second mixer configured to combine a second independent circular delta channel signal with a conjugation of the sum signal to form a second combined signal. 11. The apparatus of claim 10, wherein one of the plurality of conjugation components is configured to subtract the second combined signal from the first combined signal to produce the super delta channel signal. 12. The apparatus of claim 10, wherein the sum signal Σ, the first independent circular delta channel Δ1, and the second independent circular delta channel Δ2 are represented by [ΣΔ1Δ2]=[11111j-1-j1-j-1j][ABCD]where j is an imaginary number √{square root over (−1)}, and A is a lower left quadrant, B is a lower right quadrant, C is an upper right quadrant, and D is an upper left quadrant, respectively, of an aperture. 13. The apparatus of claim 10, wherein a direction finding signal-to-noise ratio (SNR) of the super delta channel signal is 3 decibels larger than a SNR of the first independent circular delta channel signal and the second independent circular delta channel signal. 14. The apparatus of claim 8, wherein the apparatus, using the super delta channel signal and a sum signal of four aperture quadrants, has an accuracy of a three channel system using an azimuth delta, an elevation delta, and the sum signal of the four aperture quadrants. 15. A computer program embodied on a non-transitory computer-readable medium, the computer program configured to cause at least one processor to: receive digital data streams comprising direction finding information;process the received digital data streams to produce a super delta channel signal; andoutput the super delta channel signal. 16. The computer program of claim 15, wherein the received digital data comprises digital data streams from four array quadrants A, B, C, and D. 17. The computer program of claim 16, wherein the program is further configured to cause the at least one processor to multiply each sample set {a, b, c, d} taken from quadrant streams for quadrants A, B, C, and D by a beamforming matrix [ΣΔ1Δ2]=[11111j-1-j1-j-1j][abcd]. 18. The computer program of claim 17, wherein the program is further configured to cause the at least one processor to produce the super delta channel signal using a complex conjugate of Δ1−Δ2. 19. The computer program of claim 15, wherein the received digital data comprises digital data streams corresponding to an analog sum (Σ), azimuth delta (Δaz), and elevation delta (Δel) from a three channel system. 20. The computer program of claim 19, wherein the digital data streams comprise complex data streams of the form [ΣΔ1Δ2]=[1000(1-j)/2(1+j)/20(1+j)/2(1-j)/2][ΣΔazΔel]. 21. The computer program of claim 20, wherein the program is further configured to cause the at least one processor to produce the super delta channel signal using a complex conjugate of Δ1−Δ2.
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이 특허에 인용된 특허 (6)
Crane Patrick E. (7507 Summerbridge Dr. Tampa FL 33614), Dual polarized monopulse orthogonal superposition.
Howard Dean D. (La Plata MD), Method and apparatus of generating sum or difference signals corresponding to an apparent beam in a monopulse radar syst.
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