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Low, slow and small target detection method based on FDA-MIMO radar

A low-slow and small target detection method technology, which is applied in the field of radar low-slow and small target detection, can solve the problems of small target radar scattering cross-sectional area, air defense system threat, and low flight altitude, achieving remarkable detection effect, suppressing influence, and estimating accurate effect

Pending Publication Date: 2020-03-06
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

This type of low-altitude target has low flying altitude, slow speed, small target radar cross-sectional area, and can use natural obstacles to avoid radar detection and air defense weapon attacks, causing great threats and damage to air defense systems

Method used

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  • Low, slow and small target detection method based on FDA-MIMO radar
  • Low, slow and small target detection method based on FDA-MIMO radar
  • Low, slow and small target detection method based on FDA-MIMO radar

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Embodiment

[0044] A method for detecting low, slow and small targets based on FDA-MIMO radar, comprising the following steps:

[0045] 1) Establish a multi-transmit and multi-receive frequency diversity array perpendicular to the ground, obtain two echo signal models of FDA-MIMO radar direct-direct and direct-reflection, and construct the echo observation data matrix Y, where the direct-direct echo represents the emission After the transmitted wave of the array element directly reaches the target, it is reflected by the target and reaches the echo of the receiving array element; the direct-reflected echo means that after the transmitted wave of the transmitting array element directly reaches the target, it is reflected by the target, reflected by the ground, and then reaches the echo of the receiving array element. Wave;

[0046] Such as figure 1 As shown, it is a uniform linear array with N transceiver elements, forming an N×N FDA-MIMO structure. The array elements are vertically distr...

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Abstract

The invention discloses a low, slow and small target detection method based on FDA-MIMO (Multi-Input Multi-Output) radar. The detection method comprises the following steps of: constructing a multi-input multi-output frequency diversity array to transmit and receive electromagnetic wave signals under a multipath condition; performing discrete sampling on the demodulated received signals to construct an echo observation data matrix which is expressed as a vector form; then introducing a target fluctuation model, and deriving an FDA-MIMO radar low, slow and small target detector by adopting a generalized likelihood ratio test method, so that the detection probability of a target can be effectively improved under a certain false alarm probability; and finally, comparing FDA-MIMO, MIMO and FDAradar detection performances so as to simulation verify that the detection effect of the FDA-MIMO radar is more significant. Through combination of the advantages of the FDA radar and the MIMO radar,the influence of the low-altitude multipath effect on target detection can be effectively suppressed, the performance loss caused by fluctuation of a target RCS can be well overcome, and a large space diversity gain is obtained.

Description

technical field [0001] The invention relates to the technical field of radar low-slow and small-target detection, in particular to a low-slow and small-target detection method based on FDA-MIMO radar. Background technique [0002] In modern warfare, the use of low-altitude and ultra-low-altitude aircraft to attack the enemy's important military facilities has become an important means to change the course of the war. This type of low-altitude target has low flying altitude, slow speed, small target radar cross-sectional area, and can use natural obstacles to avoid radar detection and air defense weapon attacks, causing great threats and damage to air defense systems. Therefore, research on low-altitude target detection technology has important significance and broad military application prospects. [0003] The factor that affects the detection of low, slow and small targets is the multipath effect. Aiming at the multipath effect, many suppression methods have been proposed,...

Claims

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Application Information

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IPC IPC(8): G01S13/50G01S13/56G01S7/41G01S7/42
CPCG01S13/50G01S13/56G01S7/415G01S7/42
Inventor 邓洪高巨丹静刘庆华孙少帅
Owner GUILIN UNIV OF ELECTRONIC TECH
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