Distributed synthetic aperture positioning method and system based on backward projection

By adopting the multi-UAV distributed synthetic aperture positioning method in radio reconnaissance technology, combining the backward projection algorithm and Newton's method, the problem of residual frequency deviation influence under non-cooperative reception is solved, and high-precision radiation source positioning and frequency deviation estimation are achieved.

CN119805456APending Publication Date: 2025-04-11BEIJING INST OF TECH
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Patent Information

Application Number
CN202510053405.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-14
Publication Date
2025-04-11

AI Technical Summary

Technical Problem

In the case of non-cooperative reception, the residual frequency bias will affect the accuracy and reliability of the backward projection positioning algorithm, resulting in a decrease in positioning accuracy.

Method used

A distributed synthetic aperture positioning method based on backward projection is adopted, and a multi-UAV passively receives signals, and uses a backward projection algorithm to combine residual frequency deviation to establish a nonlinear system of equations, and solve it using the Newtonian method to accurately locate the radiation source and estimate the residual frequency deviation.

Benefits of technology

High-precision radiation source positioning in non-cooperative reception situations is achieved, and the impact of frequency deviation on positioning accuracy is reduced or eliminated through frequency deviation estimation and compensation.

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Abstract

The invention discloses a distributed synthetic aperture positioning method and system based on backward projection, and belongs to the technical field of radio reconnaissance, and the method comprises the steps: arranging a plurality of unmanned aerial vehicles along the same flight path front and back, passively receiving a signal transmitted by a radiation source target, processing the received signal, and transmitting the processed signal to a server; a back projection positioning algorithm constructs a cost function of a target squint angle and a slope distance according to back projection of a Doppler history, and forms a back projection positioning image of a radiation source position in a region of interest. A nonlinear equation set of squint angles, target positions and residual frequency offsets obtained through back projection positioning search under different platforms is established, and a more accurate positioning result and a more accurate residual frequency offset estimation value can be further obtained through solving by a Newton method.
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