Method for estimating direction of arrival of radar low-elevation target

A direction-of-arrival estimation and direction-of-arrival technology, which is applied in the radar field, can solve problems such as the inability to use direction-of-arrival estimation, relatively high signal-to-noise ratio requirements, and a large amount of calculation for angle search, so as to eliminate the amount of calculation and improve the signal Noise ratio, the effect of reducing the amount of calculation

Inactive Publication Date: 2011-04-13
XIDIAN UNIV
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Problems solved by technology

[0006] The above method 1 and method 2 are both methods based on the data covariance matrix. Since the information available from the radar is not fully utilized, the requirements for the signal-to-noise ratio are relatively high, and they cannot be used for direction of arrival estimation in the case of a single sample number
[0007]...

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  • Method for estimating direction of arrival of radar low-elevation target
  • Method for estimating direction of arrival of radar low-elevation target
  • Method for estimating direction of arrival of radar low-elevation target

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Embodiment Construction

[0032] refer to figure 1 , the multipath geometric model of the radar low-elevation target echo used in the present invention includes a vertically placed uniform line array antenna and a height h t , where the uniform linear array antenna is used as the receiving antenna of the radar, the number of array elements of the antenna is M, the distance between the array elements is d, and the center height of the antenna is h a , the straight-line distance between the target and the radar is R d , the distance from the target echo to the radar after being reflected by the ground (sea) surface is R s , the direction of arrival of the target and the direction of arrival of the multipath reflected wave are respectively θ d and θ s , assuming that the direction of arrival above the horizontal direction is the positive direction of the angle.

[0033] refer to figure 2 , the present invention combines figure 1 The multipath geometric model is used to estimate the direction of arr...

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Abstract

The invention discloses a method for estimating the direction of arrival of a radar low-elevation target, which mainly solves the problem of large calculation of the estimation of the direction of arrival of the low-elevation target in the prior art. The method comprises the following steps of: 1, transmitting a group of narrowband phase reference pulse signals with bandwidth of not exceeding 1 percent of carrier frequency; 2, receiving radar echo data by using a uniform line array; 3, carrying out beam forming on the radar echo data, wherein the beam points 0 degree; 4, measuring a distance sampling unit and a Doppler channel in which a target is disposed; 5, re-accumulating the received radar echo data according to the obtained distance sampling unit and the Doppler channel; 6, constructing a matrix beam by using the re-accumulated data; and 7, solving the direction of arrival of the target for the constructed matrix beam by adopting a total least square method of generalized eigenvalue decomposition.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a method for estimating the direction of arrival of a radar to a low-elevation angle target. Background technique [0002] Target location is an essential function of radar. When detecting a target at a low elevation angle, the radar beam hits the ground, so that the direct wave of the target and the multipath reflected wave reflected by the ground (sea) surface are superimposed in the main lobe of the antenna beam, and their Doppler frequency and echo delay are approximate Equal, this group of strongly correlated signals is received by the radar antenna at the same time, so that the radar angle estimation system cannot correctly estimate the direction of arrival of the target, which brings difficulties to target positioning. In order to solve this problem, the prior art has the following three methods: [0003] 1. Wu Xiangdong et al. proposed in the article "A low-elevation-ang...

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Application Information

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IPC IPC(8): G01S7/41G01S13/06
Inventor 刘峥刘俊赵伟孙慧霞谢荣
Owner XIDIAN UNIV
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