Azimuth information-based beyond-visual-range target geographic coordinate direct estimation method

Abstract

The invention belongs to the technical field of radio signal positioning, in particular to an azimuth information-based beyond-visual-range target geographic coordinate direct estimation method; the method comprises the following steps of establishing a two-dimensional angle array signal model of each observation station, wherein the two-dimensional angles comprise an azimuth angle and a pitch angle, and calculating respective covariance matrixes; based on a ground plane coordinate system of each observation station, establishing a mathematical model of each station arrival azimuth angle relative to the target geographic coordinate parameters; utilizing the covariance matrix of each station, and establishing a mathematical optimization model for jointly estimating the target geographic coordinate parameters and the pitching angle parameters according to the maximum likelihood estimation criterion; and solving the mathematical optimization model through iteration, and obtaining a targetaddress coordinate. By adoption of the method, the target positioning precision under a low signal-to-noise ratio can be remarkably improved, the estimation precision of the target pitch angle is improved, and the convergence speed is relatively high, high-dimensional searching is not needed, and the calculation amount of real-time positioning can be effectively reduced; and the method is relatively high in practical application value, stable and reliable in performance, and efficient.

Description

technical field [0001] The invention belongs to the technical field of radio signal positioning, in particular to a method for directly estimating the geographic coordinates of an over-the-horizon target based on azimuth information. Background technique [0002] As we all know, radio signal positioning technology is very important for target discovery and situation awareness. After decades of development, this technology has made great progress in theory and engineering applications. According to the number of observation stations, the radio signal positioning system can be divided into two categories: single station positioning and multi-station positioning. The former has the advantages of simple system, high flexibility, no need for information synchronization and communication transmission, etc., while the latter can provide More observations, which help to obtain higher positioning accuracy in a shorter time. [0003] In the multi-station positioning system, the two m...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of limited positioning accuracy and signal-to-noise ratio threshold of over-the-horizon targets, the present invention provides a method for directly estimating the geographical coordinates of over-the-horizon targets based on azimuth information to improve the performance of over-the-horizon target positioning

Images