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Signal processing method for random pulse interval sequence

A random pulse and signal processing technology, applied to radio wave measurement systems, instruments, etc., can solve the problem of inability to obtain Doppler information, inability to suppress target signal range ambiguity and Doppler ambiguity, radar inability to effectively detect distant targets, etc. question

Active Publication Date: 2016-04-20
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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Problems solved by technology

[0006] 1. The detection range will be limited to the unambiguous distance, and the radar cannot effectively detect distant targets;
[0007] 2. Accurate Doppler information of the target cannot be obtained. Due to the random change of the pulse interval, the change law of the echo phase becomes complicated, and the fast Fourier transform cannot effectively extract the change law of Doppler.
[0008] Therefore, the traditional processing methods of periodically repeated burst signals cannot be used to process random PRI sequences, so that the range ambiguity and Doppler ambiguity of the target signal cannot be suppressed, and the anti-sorting performance is poor

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  • Signal processing method for random pulse interval sequence
  • Signal processing method for random pulse interval sequence

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Embodiment

[0149] Based on the method proposed by the present invention, the target parameters are estimated for the simulated echoes in the three-target scene, where the target amplitudes differ by 30 dB in turn, considering the distance blind area caused by pulse occlusion and short-range strong clutter, and the background noise is complex Gaussian noise. figure 1 It is a schematic diagram of the frequency response of the orthogonal projection filter. The horizontal axis is the Doppler frequency in kHz, and the vertical axis is the normalized frequency response in dB. figure 1 It embodies the good effect of the orthogonal projection filter to filter out single-frequency signals. Figure 2(a), Figure 3(a) and Figure 4(a) respectively show the |Z after the first, second and third Doppler filtering 2 The output result of the distance dimension corresponding to the Doppler frequency unit where the peak value of | is, the abscissa is the distance, the unit is km, and the ordinate is |Z 2 Th...

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Abstract

The invention belongs to the technical field of radar signal processing, and relates to a signal processing method for a random pulse interval sequence. The method is characterized in that the method comprises the following steps: carrying out the sampling of one-dimensional echo data y(t); converting one-dimensional echo data y(t) into two-dimensional data Z0; carrying out distance-dimension matched filtering; carrying out the Doppler-dimension matched filtering; carrying out the target parameter estimation based on two-dimensional peak detection; constructing a target guide vector matrix (shown in the description), and carrying out rectangular projection filtering. The method provided by the invention can inhibit the distance fuzzy and Doppler fuzzy of a target signal, improves the separation resistance of a radar, and achieves the effective estimation of a detection target parameter.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to a signal processing method of a random pulse interval sequence. Background technique [0002] Pulse repetition interval (PRI) not only affects radar detection performance, but also is an important parameter for sorting in the field of electronic countermeasures. Traditional airborne fire control radars use a constant PRI sequence. This type of sequence can realize the coherent accumulation of pulse signals, but it also brings double ambiguity problems of distance and Doppler. The periodicity of the pulse train makes its anti-sorting performance very poor. The fundamental wave has a high probability of being sorted. [0003] Pulse-to-pulse stagger PRI and pulse group PRI are also widely used in radar systems. The former is generally used in the moving target indication (MTI) mode. The transmitted pulse train is periodically converted between stable PRI and processe...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 朱洁丽黄天耀赵桐
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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