Step frequency inverse synthetic aperture radar (ISAR) imaging method based on coherent processing
A technology of stepping frequency and imaging method, applied in the field of radar, can solve the problems of poor side lobe, low operation efficiency, widening of the main lobe of target image, etc.
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[0037] The present invention will be further described below with reference to the accompanying drawings.
[0038] refer to figure 1 , the specific implementation steps of the present invention are as follows:
[0039] Step 1. Establish a stepped frequency ISAR echo signal model.
[0040] Assume that the waveform of the chirp stepping signal emitted by the radar is:
[0041] U(t)=u 1 (t)exp(j2π(f 0 +nΔf)t) 0≤n≤N-1
[0042] In the formula, u 1 (t)=rect(t / T 1 )exp(jπγt 2 ) is the chirp sub-pulse, exp is the base of the exponential function, j is the imaginary number, f 0 is the fundamental frequency, n is the number of sub-pulses in the frequency modulation step, Δf is the frequency step, f 0 +nΔf is the carrier frequency of the nth FM step sub-pulse, t is the time, N is the step frequency modulation number of the sub-pulses in each pulse group, T 1 is the sub-pulse width, and γ is the sub-pulse modulation frequency;
[0043] The distance between any scattering point ...
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