Radar foresight three-dimensional imaging method based on descending segment curve trajectory

Abstract

The invention discloses a radar foresight three-dimensional imaging method based on a descending segment curve trajectory. The problem that a descending segment curve trajectory radar can only form atwo-dimensional image for a target is solved. The method comprises the steps that an echo signal mathematical model is established; a mathematical model of SAR configuration is vectorized to acquire athree-dimensional wavenumber spectrum of SAR configuration; the coordinate information of the target and a target scattering coefficient are acquired; and radar foresight three-dimensional imagingof the descending segment curve trajectory is realized. According to the invention, the influence of a one-dimensional weakly coupled wavenumber spectrum is ignored in the three-dimensional wavenumber spectrum; the two-dimensional coordinate information of the scene target corresponding to another two-dimensional wavenumber spectrum is extracted; an optimal processing algorithm based on l1 optimization is used to acquire the target scattering coefficient; the unique tangential flight characteristics of a missile are used to add spatial freedom to achieve a synthetic aperture in the tangentialdirection; three-dimensional imaging is carried out on the target to solve the problem that a traditional missile-borne SAR model has a certain angle with the target spacing to achieve azimuth high-resolution; and the method is suitable for a missile-borne high-resolution radar guidance technology.

Description

technical field [0001] The invention belongs to the technical field of new system radar imaging, and establishes a new system model based on the snake-shaped tangential motion characteristics of missiles, specifically a radar forward-looking three-dimensional imaging method based on the curve trajectory of the descending section, which is used in missile-borne high-resolution radar guidance technology middle. Background technique [0002] At present, the missile-borne Synthetic Aperture Radar (SAR) seeker adopts the spotlight SAR imaging mode in the missile descent section, and obtains the SAR imaging of the target scene in real time through high-resolution two-dimensional focused imaging of the target scene, and Matching and positioning with the set SAR reference image to realize the positioning and identification of the target. However, conventional synthetic aperture radar imaging technology obtains high-resolution microwave images of distance and azimuth by transmitting...

AI Technical Summary

Problems solved by technology

[0003] Liu Xiangyang and others proposed in the document "Airborne Forward-Looking Array 3D Imaging Method for High-Resolution Source Estimation" to use matched filtering of broadband signals to achieve high-resolution heading. However, when this method detects and identifies targets, the flight direction of the missile is required. There is a certain angle between the target and the missile to obtain the high-resolution image of the target's azimuth. In the end, it is necessary to fly a certain arc trajectory to strike the target; this will greatly consume the energy of the missile itself and increase the difficulty of guidance and control.

[0004] Fan Yong and others proposed a method to reconstruct the target image spectrum in the frequency domain by using non-stationary convolution filter processing in the document "Forward-looking Ground Penetrating Radar 3D Synthetic Aperture Imaging and Multi-look Processing". The seeker does not have the ability to self-seek and attack the target, and must use matching guidance to attack the target, which greatly reduces the performance of the missile's precise strike target, such as attacking stationary or moving armored targets on the ground and ships moving on the sea surface target, etc., it is difficult to find a suitable matching area for locating and attacking the target

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