Ground clutter suppression method based on whitening filter

A technology of whitening filter and clutter suppression, which is applied in the direction of instruments, radio wave measurement systems, etc., can solve problems such as the discussion of the target speed, and achieve the effect of improving the filtering effect

Inactive Publication Date: 2016-12-07
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Invention patent 201110409933.2 discloses an adaptive clutter suppression moving target signal processing technology and implementation method, mainly for ground clutter interference, the signal after the pulse pressure is cancelled, and then sent to the narrowband FIR filter bank, each The output of the filter bank is processed

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  • Ground clutter suppression method based on whitening filter
  • Ground clutter suppression method based on whitening filter
  • Ground clutter suppression method based on whitening filter

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Embodiment

[0055] In this embodiment, the simulation parameters are set as follows: the carrier frequency is 10 GHz, the carrier is a chirp signal, the bandwidth is 10 MHz, the sampling frequency is 20 MHz, the pulse duration is 80 μs, the duty ratio is 1:20, and the number of accumulations in the slow time dimension is 512 times. Make a uniform linear motion along the radial direction, the speed is 0.4m / s, the noise is white noise, the signal-to-noise ratio is 10dB, the clutter is ground clutter obeying the Rayleigh distribution, and the signal-to-clutter ratio is 0dB.

[0056] From figure 2 It can be seen from the figure that in the case of conventional moving target detection processing, the clutter energy near zero frequency is concentrated, and its amplitude is similar to that of the target energy. It is difficult to detect the target, and false alarms are extremely prone to occur.

[0057] From image 3 It can be seen from the figure that after the whitening filter preprocessing,...

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Abstract

The invention discloses a ground clutter suppression method based on a whitening filter. The method comprises the steps of subjecting radar echo data containing clutters and noises to the pulse compression treatment, rearranging data according to range gates, setting the K-th range gate after the pulse compression treatment as a reference unit, establishing a self-regression process based on the radar echo data in the slow-time dimension, estimating the self-regression model parameters of the reference unit according to the Burg algorithm based on three-order cumulants, constructing a whitening filter based on the self-regression model parameters of the reference unit, subjecting the data of a current detection unit to the whitening and filtering treatment by using the constructed whitening filter, and subjecting filtered time domain signals to the moving target detection treatment. According to the technical scheme of the invention, clutters for a moving target with a low velocity can be effectively inhibited, and clutters originally aggregated in the vicinity of the zero frequency can also be effectively inhibited. The power is dispersed, so that clutters appear in the form of approximate white noises in the frequency domain. After the power dispersing process, the influence of clutters on the detection of the moving target with the low velocity is obviously reduced.

Description

technical field [0001] The invention relates to a clutter suppression technology in radar signal processing, in particular to a ground clutter suppression method based on a whitening filter. Background technique [0002] Since the birth of radar in the 1930s, radar technology has developed rapidly. In recent years, the theoretical and applied research of various radar processing techniques has become a popular and key topic. When the radar detects the target, there are various background interferences around the target, also known as clutter, that is, the reflected echoes of all passive reflectors other than the moving target that the radar needs to detect, and the radar target echo signal is often mixed with With stronger environmental clutter, if weak targets are submerged in strong clutter, especially when the strong clutter overloads the receiver, the detection of these targets will become very difficult. Even if the target is not in the clutter background, it is very ...

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 芮义斌魏知寒李鹏谢仁宏郭山红赵若冰陈奇李秀珍季佳恺
Owner NANJING UNIV OF SCI & TECH
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