Double-base positioning method based on template matching

Abstract

The invention discloses a double-base positioning method based on template matching. The method comprises the following steps: S1, making a template drawing according to an optical image of a target area; s2, according to the airborne GPS equipment information, acquiring the position information of the aircraft at the synthetic aperture center moment; s3, the receiving platform calculates the distance from the receiving platform to the scene center point according to the position information of the synthetic aperture center moment and the bistatic distance sum; s4, projecting an SAR imaging result into a ground distance map, and performing matching identification on the target area optical template map and the imaging result to obtain position information of a target relative to a scene center point; and S5, selecting auxiliary points of the same distance unit and different azimuth units in the synthetic aperture time, calculating the distance from the receiver platform to the auxiliary points, and further obtaining the distance, azimuth angle and pitch angle information of the target relative to the receiver. According to the invention, high-precision positioning of the target is realized, and support is provided for subsequent generation of guidance information.

Description

technical field [0001] The invention relates to the technical field of radar imaging positioning, and more particularly, to a dual-base positioning method based on template matching. Background technique [0002] Bistatic SAR imaging, that is, on the basis of traditional radar SAR imaging, the transmitter and receiver required for radar active detection and imaging are placed on two different platforms, in the form of distributed semi-active radar, through the two platforms The cooperative work of one transmission and one reception can realize the function of radar SAR imaging. This type of system combines the advantages of semi-active radar and single-base SAR imaging. It can not only perform radar SAR imaging, but also adopt appropriate imaging configurations for the transmitting and receiving platforms, and can also realize radar imaging of the target directly in front of the receiving station. Separately, the receiving station receives silently. Under the condition that...

AI Technical Summary

Problems solved by technology

Traditional positioning algorithms only rely on image matching. When the target scene is a vast sea area, there is no image reference point, which leads to image matching failure. It needs to be solved in combination with SAR imaging geometry. Therefore, a template matching-based bi-base The geometric configuration positioning method is very meaningful

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