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Range ambiguity clutter suppression method based on pitching TDA

A distance ambiguity and clutter suppression technology, applied in the field of signal processing, can solve problems such as difficulty in finding waveform families, adverse effects of clutter suppression, etc.

Active Publication Date: 2021-08-31
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, it is difficult to find a waveform family that fully satisfies the requirement of orthogonality
Cross-correlation between waveforms often produces high sidelobe levels, which can adversely affect clutter rejection

Method used

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  • Range ambiguity clutter suppression method based on pitching TDA
  • Range ambiguity clutter suppression method based on pitching TDA
  • Range ambiguity clutter suppression method based on pitching TDA

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057]In this embodiment, the echo signal of the pitching TDA array (Time diversity Arrays) is firstly matched and filtered, and then the expected echo is separated from the range ambiguity by band-pass filtering in the range-frequency domain to realize distance compression in the range-frequency domain and ambiguity suppression; then the Doppler spectrum in the ambiguity area is translated by phase encoding technology, and the residual distance ambiguity suppression is carried out by Doppler bandpass filter; finally, Doppler frequency shift compensation is performed to make the noise in the main distance area The wave data are approximately independent and identically distributed, and the JDL adaptive processing method is used to suppress the clutter to realize range ambiguity clutter suppression.

[0058] Specifically, see figure 1 , figure 1 It is a schematic flow chart of a pitching TDA-based range ambiguity clutter suppression method provided by an embodiment of the pres...

Embodiment 2

[0155] The beneficial effects of the present invention will be further described through simulation experiments below.

[0156] 1. Experimental conditions

[0157] The hardware platform of the simulation experiment of this embodiment is: Intel (R) Core (TM) i5-8265U CPU@1.60GHz, frequency is 1.8GHz, Nvidia GeForce MX250.

[0158] The software of the simulation experiment of the present embodiment uses matlab2016b.

[0159] In this embodiment, a forward-looking airborne pitching TDA radar system is considered. The main simulation parameters are shown in Table 1, the noise-to-noise ratio is 30 dB, and the number of training samples is 300. Assume that the target cone angle is 90 degrees and the radial velocity is 30m / s.

[0160] Table 1 list of simulation parameters

[0161]

[0162] 2. Simulation content and result analysis

[0163] See Figure 2a-2b , Figure 2a-2b is the joint clutter spectrogram of the traditional phased array radar in the spatial frequency domain a...

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Abstract

The invention discloses a range ambiguity clutter suppression method based on pitching TDA. The range ambiguity clutter suppression method comprises the following steps of acquiring an original echo signal of the pitching TDA; performing filtering processing on the original echo signal to suppress range ambiguity so as to obtain an expected echo signal; decoding the expected echo signal by using an APC method to obtain an echo signal without a fuzzy region; and performing clutter compensation on the echo signal without the fuzzy region to obtain a target echo signal. The method provided by the invention can effectively solve a problem of range ambiguity without an orthogonal waveform, has good clutter suppression performance, and can be used for realizing wide-area monitoring and target tracking.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a range ambiguity clutter suppression method based on elevation TDA. Background technique [0002] In the field of high pulse repetition frequency (HPRF) or wide-area surveillance radars, range ambiguity is an unavoidable problem because the fundamental contradiction between Doppler ambiguity and range ambiguity cannot be resolved simultaneously. The range ambiguity problem plays an important role in system parameter design and signal processing algorithms, especially in high-speed platform systems. In general, clutter echoes from unambiguous distance and ambiguous distance regions have different backscatter characteristics. If distance ambiguity and distance dependence (caused by the forward-looking geometry) coexist, the clutter characteristics will become extremely complex, which will further reduce the performance of the STAP (Space-Time Adaptive Proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S7/36
CPCG01S7/414G01S7/41G01S7/36Y02A90/10
Inventor 贺雄鹏刘昆廖桂生许京伟曾操朱圣棋邢航
Owner XIDIAN UNIV