Complementary-sequence pulse radar with matched filtering and Doppler tolerant sidelobe suppression preceding Doppler fi
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01S-013/28
G01S-013/42
출원번호
US-0103027
(1993-08-06)
발명자
/ 주소
Gallagher John J. (Turnersville NJ) Urkowitz Harry (Philadelphia PA)
출원인 / 주소
Martin Marietta Corporation (Moorestown NJ 02)
인용정보
피인용 횟수 :
120인용 특허 :
0
초록▼
A radar transmits dispersed pulses in which the subpulses are modulated by first and second mutually complementary code sequences, the autocorrelation functions of which are selected so that, in the sum of their autocorrelation functions, the main range lobes add, and the range sidelobes cancel. The
A radar transmits dispersed pulses in which the subpulses are modulated by first and second mutually complementary code sequences, the autocorrelation functions of which are selected so that, in the sum of their autocorrelation functions, the main range lobes add, and the range sidelobes cancel. The received pulses with their Doppler sidebands are applied to a plurality of channels, each of which (except one) contains a mixer-oscillator combination that removes a specific Doppler phase shift along the range dimension at a different channel frequency. One channel has no mixer-oscillator because it is centered at a zero channel frequency. Within each channel, the received signals modulated by the first and second codes are matched-filtered by filters matched to the first and second codes, respectively, to produce first and second time-compressed pulses, each including (a) a main lobe representing the target range, and (b) undesirable range sidelobes. The first and second time compressed pulses are added together in each channel, to produce range pulses with suppressed range sidelobes. The channel signals, after pulse compression, delay, and addition, are each applied to one channel of a pulse-to-pulse Doppler filter bank. The outputs from the pulse-to-pulse Doppler filter bank are applied for further radar signal processing.
대표청구항▼
A method for detecting anomalies, comprising the steps of: transmitting toward an anomaly a plurality of pulse sets, each consisting of a predetermined plurality of pulses, said pulses of said sets being dispersed in time pursuant to predetermined phase codes, said pulses of said sets being, in comb
A method for detecting anomalies, comprising the steps of: transmitting toward an anomaly a plurality of pulse sets, each consisting of a predetermined plurality of pulses, said pulses of said sets being dispersed in time pursuant to predetermined phase codes, said pulses of said sets being, in combination, selected mutually complementary in a manner such that, after pulse compression and summation of said pulses, range sidelobes cancel and main range lobes add; receiving echoes of said pulses reflected from said anomaly to produce received range signals extending over a spectrum spaced about a plurality of predetermined frequencies, which predetermined frequencies represent various target velocities, said received signals being encoded with one of said phase codes; at each of said predetermined frequencies, matched filtering said received signals with one of said phase codes to produce compressed range pulses in which the main range lobes are of the same sense, and in which the range sidelobes cancel, and the spectrum of which includes significant energy at adjacent ones of said predetermined frequencies; summing said compressed range pulses to produce compressed range signals in which said range sidelobes are suppressed, and in which the spectrum includes significant energy at adjacent ones of said predetermined frequencies; and Doppler filtering said compressed range signal pulse sets into said plurality of predetermined frequencies to produce a sequence of range values at each of said predetermined frequencies, with reduced energy at said adjacent ones of said predetermined frequencies.
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