Phase-coherent accumulation method based on frequency domain shear
A technology of coherent accumulation and shearing, applied in the field of coherent accumulation based on frequency domain shearing, can solve problems such as performance degradation, interpolation loss, side lobes, etc., and achieve the effect of easy engineering implementation and fast calculation speed
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[0039] The invention relates to a technique for compensating and aligning target echo envelopes and completing coherent accumulation of echo energy in the case of radio echo signals moving across distances (envelope walking).
[0040] refer to figure 1 As shown, it is an implementation flowchart of the coherent accumulation method based on frequency domain shear in the present invention, and its specific implementation steps are as follows:
[0041] In step 1, the radar receives the radar echo data and performs frequency mixing to obtain a baseband radar echo signal.
[0042] Assume that the far-field, single-target echo signal received by the radar within a coherent accumulation interval (CPI) is
[0043] the s r (t,t m )=A r p(t-2R(t m )c)exp(-j4πf c R(t m )c) (1)
[0044] Among them, t and t m are fast time and slow time (t m =mT r , and T r is the pulse repetition interval (PRI)); f cis the carrier frequency; c is the speed of light; A r is the echo amplitude...
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