Method for implementing uniform period repetition phase encoding continuous-wave radar diversity impulse
A technology of phase encoding and implementation method, which is applied in the radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problem of periodic signal energy difference, and achieve the effect of improving the ability of moving targets
Inactive Publication Date: 2008-07-30
SOUTHEAST UNIV
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But this is also contradictory to pulse compression and MTI, because each repetition period is different, pulse compression cannot be completed by using periodic autocorrelation, and the signal energy of each period is different, so it cannot be directly processed by MTI
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[0014] Fig. 1 is the functional block diagram that can be adopted for realizing the present invention, among the figure receiver 1 output target echo is the phase coded baseband I / Q signal that repetition cycle is T, and this signal is divided into N road, in N road matched filter In 21~2N, the pulse compression of the target echo is completed. The matched filters 21-2N are designed to match the codeword sequence after the cyclic shift of the phase-encoded signal, N-way matched filters are matched to different codeword sequences, and the i+1-th matched filter is matched to the i-th path The phase offset between the codeword sequences of the filter is P i (i=1, 2,..., N-1), the phase offset between the code word sequences of the first matched filter relative to the N matched filter is P N , phase offset P i The corresponding shift time is dt i . After the same phase-encoded echo signal passes through the matched filter 21~2N, the peak values of the output N pulse compress...
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The invention relates to a method for phase encoding in uniform repetition period of continuous-wave radar with staggered pulse. By utilizing the periodic cycle feature of phase encoded continuous-wave radar signals, multi-pass matched filter banks with different phase offsets can finish pulse compression, and the multi-path output signals after pulse compression can be selected by a selector to form a signal sequence with staggered periodic repetition. The phase encoded continuous-wave radar signals with uniform repetition period of T received by a receiver (1) are sent to N-path matched filters (2) for N-path matched filtering, the N-path pulse compression signals after N-path matched filtering sequentially select the outputs of the matched filters via a selector (3) to form a signal sequence output with staggered periodic repetition. The staggered periodic repetition sequence can increase the first blind speed via a MTI filter and improve the clutter suppression performance of the phase encoded continuous-wave radar.
Description
technical field [0001] The invention relates to a moving target display technology in the field of target detection, in particular to a method for realizing blind speed delay by phase coded continuous wave radar using staggered pulses. Background technique [0002] Low probability of intercept probability radar is one of the development trends of modern radars. Phase-coded continuous wave radar is one of them. It has the lowest peak power and power spectral density. Combined with phase-coded pulse compression technology, it can realize target detection at long distances. not easy to detect. [0003] Finding moving targets in a strong clutter environment is one of the necessary functions of modern radars, and one of the most effective methods for clutter suppression is Moving Target Indicator (MTI) technology. For phase-encoded continuous wave radar, in order to cover a larger range, low-repetition-period phase-encoded signals are usually used. The first blind speed of MTI i...
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IPC IPC(8): G01S7/02G01S13/06
Inventor 杜永强黄鹤蒋良成赵春明尤肖虎
Owner SOUTHEAST UNIV