Fiber delay loop-based estimation algorithm of maneuvering target acceleration in single echo
A fiber optic delay and maneuvering target technology, applied in radio wave reflection/re-radiation, radio wave measurement systems, instruments, etc., can solve the problems of intra-pulse feature loss, shorten the target acceleration estimation observation time, etc., and achieve real-time enhancement, The effect of eliminating the loss of intrapulse features and prolonging the observation time
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[0051] When the target transmits a constant carrier frequency signal and the target moves at a variable speed, the echoes falling into the range gate are delayed by the fiber ring, and the replicated pulses are mixed and filtered, and then sampled synchronously at the same position, such as (9) Mode.
[0052] Simulation parameters: radar wavelength λ=8mm, target initial velocity v=200m / s, acceleration a=100m / s 2, radar pulse width τ=1μs, pulse repetition period is f r = 10KHz, f s =20KHz. At this time f d =50000Hz, k=25000Hz / s. According to formula (13), T≤1 / 2f d =10μs, take T=2.5μs. From formula (13), we know that N=25000 is taken for obvious frequency modulation effect and convenient calculation, and the fiber delay loop will generate a pulse sequence. After sampling, the sampling sequence s(n) in formula (9) is obtained, and the pulse accumulation time is Nτ=25ms. Its waveform and frequency spectrum are as follows figure 2 with image 3 As shown, there are obviou...
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