Method for detecting low signal-to-clutter ratio (SCR) moving target by stepped frequency coherent processing

A stepping frequency, moving target technology, applied in the direction of measuring device, radio wave measurement system, radio wave reflection/re-radiation, etc., can solve problems such as failure, signal processing model echo data mismatch, etc., to improve the detected Effect

Active Publication Date: 2018-12-21
WUHAN BINHU ELECTRONICS
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Problems solved by technology

However, in the strong clutter environment and the low SNR of moving targets faced by radars, the SCNR of moving targets cannot be raised to a detectable level by simply relying on the stepping frequency, so it is necessary to rely on the combination of coherent accumulation methods to achieve the improvement. SCNR of moving target
[0004] The existing narrow-band radar technology schemes all realize the detection of moving targets und

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  • Method for detecting low signal-to-clutter ratio (SCR) moving target by stepped frequency coherent processing
  • Method for detecting low signal-to-clutter ratio (SCR) moving target by stepped frequency coherent processing
  • Method for detecting low signal-to-clutter ratio (SCR) moving target by stepped frequency coherent processing

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[0067] 1. The configuration steps of the transmit signal parameters

[0068] 1.1 The sub-step of calculating the phase parameter points of the transmitted signal;

[0069] According to the transmit PRF of the radar and the beam dwell time T beam , to obtain the total number of single-wave pulses N; according to the radar step frequency step size Δf and the total system bandwidth B, obtain the number of step carrier frequency points N Δf .

[0070] This embodiment adopts a single moving target model in clutter detection, the moving target speed is 8m / s, the SNR before the single pulse pulse pressure is 0dB, the transmitted signal bandwidth is 2MHz, the LFM with a time width of 300us, the repetition frequency PRF is 1KHz, and the beam dwells The time is 0.32s, the pulse number of the single-frequency point pulse group is 20, the MTI order is 5, the number of frequency-hopping frequency points is 16, the basic carrier frequency is 5GHZ, the average single-pulse echo SCR is -80d...

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Abstract

The invention relates to the field of detecting a moving target by a narrow-band ground-based radar in a clutter environment, and particularly relates to a method for detecting a low signal-to-clutterratio (SCR) moving target by a stepped frequency coherent processing. The method comprises the following steps: transmitting an inter-pulse same frequency signal by a radar with the frequency stepping between pulse group signals, firstly performing equal order AMTI on each carrier frequency pulse group signal in a group in the received signal processing; performing step frequency phase synthesisafter phase compensation on a time-aligned AMTI result of each carrier frequency; and finally completing coherent accumulation by a step frequency synthesized image at a slow beat; thereby completingseparation between the moving target and the remaining clutter, and achieving a purpose of improving the SCNR of the moving target detected.

Description

technical field [0001] The invention relates to the field of detection of moving targets by narrow-band ground-based radar in a clutter environment, in particular to a method for detecting low-signal-to-clutter ratio moving targets through step-frequency coherent processing. Background technique [0002] Detecting moving targets from strong clutter background is an important task of radar, and it is also a difficult point. When using traditional AMTI or point-optimized AMTD to deal with ground (sea) clutter in different environments, if the clutter environment is not estimated in real time and the filter coefficients are produced, clutter residues will inevitably be generated, making moving targets need In the detection process, it competes with these remaining clutters for energy. The clutter residue can be divided into two cases: one is that the filter null does not match the shape of the power spectrum of the clutter, resulting in a strong clutter residue in the sidelobe...

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Application Information

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IPC IPC(8): G01S13/58
CPCG01S13/588
Inventor 徐敏超陈钟杨越李青
Owner WUHAN BINHU ELECTRONICS
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