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

Active Publication Date: 2019-12-24
NAVAL AERONAUTICAL UNIV
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Problems solved by technology

[0004] Aiming at the deficiencies in the above-mentioned prior art, the present invention provides an estimation algorithm for the acceleration of a maneuvering target based on an optical fiber delay loop in a single echo, which realizes long-term observation of a single pulse echo signal and solves the problem of existing PD radar pulses. The problem of loss of intra-pulse features caused by coherent accumulation, and shorten the observation time required for target acceleration estimation

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  • Fiber delay loop-based estimation algorithm of maneuvering target acceleration in single echo
  • Fiber delay loop-based estimation algorithm of maneuvering target acceleration in single echo
  • Fiber delay loop-based estimation algorithm of maneuvering target acceleration in single echo

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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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Abstract

The invention relates to a fiber delay loop-based estimation algorithm of a maneuvering target acceleration in a single echo and belongs to the technical field of radar signal processing. The estimation method comprises the steps of reproducing a pulse signal by using a ring waveguide to obtain signal waveforms after different delays; and multiplying the signal waveforms with an emission signal toobtain at least one coherent echo. The observation time of an echo pulse can be equivalently prolonged, and the maneuvering target acceleration can be estimated through a new echo pulse sequence. According to the algorithm, all in-pulse characteristics of a target signal can be observed and read over a long period of time; a single echo pulse received by a radar can be propagated and sampled overa long period of time in a specific transmission line, so that the observation time of the echo pulse is equivalently prolonged, loss of the in-pulse characteristics caused by coherent integration ofthe pulse is eliminated, the instantaneity in the aspect of estimating the target radial acceleration is significantly enhanced and the estimation efficiency of target parameters is improved.

Description

technical field [0001] The invention relates to an estimation algorithm of the acceleration of a maneuvering target based on an optical fiber delay loop within a single echo, which belongs to the technical field of radar signal processing. Background technique [0002] For pulse Doppler (PD) radar, it is very difficult to estimate the parameters of the target in a very short pulse duration, so the system radar adopts the signal form of coherent carrier, and uses its signal phase correlation characteristics to combine multiple The pulse data is connected to extend the observation time of the signal equivalently, so as to obtain higher parameter estimation accuracy; however, due to the inherent characteristics of the radar target are different due to the different observation time and horizon angle, each radio frequency from the target The target information contained in the pulse is different. If the multiple pulse signals are coherently accumulated according to the conventio...

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Application Information

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IPC IPC(8): G01S13/58G01S7/41
CPCG01S13/581G01S7/418
Inventor 贾舒宜王海鹏唐田田谭顺成郭强刘传辉
Owner NAVAL AERONAUTICAL UNIV
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