Low-altitude target elevation angle estimation method under complex terrain conditions

Abstract

The invention discloses a low-altitude target elevation angle estimation method under complex terrain conditions. The main idea of the low-altitude target elevation angle estimation method comprises the steps of: determining a radar, wherein a low-altitude target exists in a detection range of the radar, the low-altitude target is a target away from the ground at a set distance, a total number ofarray elements contained in the radar is N, a total number of digital slow sampling times is determined as Snap, and the radar transmits a signal to the low-altitude target in the detection range of the radar and receives a low-altitude target echo signal; determining a low-altitude target range unit, performing Snap times of digital slow sampling on the low-altitude target echo signal at the low-altitude target range unit, calculating to obtain a sample data covariance matrix estimated value R<x><downward left parenthesis> of the low-altitude target echo signal; determining a search angle range [Theta alpha, Theta beta] of the radar, wherein Theta alpha represents the minimum search angle of the radar, Theta beta represents the maximum search angle of the radar; and constructing an energyspectrum E of the low-altitude target echo signal, and further acquiring an low-altitude target elevation angle estimated value, wherein low-altitude target elevation angle estimated value is a low-altitude target elevation angle estimation result under the complex terrain conditions.

Description

technical field

[0001] The invention belongs to the technical field of radar parameter estimation, and in particular relates to a method for estimating the elevation angle of a low-altitude target under complex terrain conditions, which is applicable to the angle estimation of the target by radar in a multipath environment. Background technique

[0002] When the radar measures the angle of the low-altitude target, the beam pointing angle of the radar is small, and it is easy to cause the beam to hit the ground, which makes the reflection of the ground and sea surface stronger, and at the same time, the received noise and clutter increase, and the multipath phenomenon of the target is serious. lead to inaccurate measurement results. Due to the influence of multipath effect, the direct echo and reflected echo of the strongly coherent target enter the same main lobe width of the receiving beam at the same time, and it is difficult to distinguish the two by general methods, whic...

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