Moving target positioning method based on TDOA (Time Difference of Arrival) and FDOA (Frequency Difference of Arrival)

Abstract

The invention discloses a moving target positioning method based on a TDOA (Time Difference of Arrival) and an FDOA (Frequency Difference of Arrival). The moving target positioning method comprises the steps of: setting that one moving target for transmitting a signal, one mobile sensor used for receiving the signal and used as a reference sensor and a plurality of mobile sensors only used for receiving the signal exist; then calculating a distance difference between a transmission distance from the moving target to each mobile sensor only used for receiving the signal and a transmission distance from the moving target to the reference sensor and a distance difference change rate; next, calculating initial values of a position and a speed of the moving target; then determining a positioning problem of the moving target so as to solve to obtain an accurate estimated value of the position of the moving target; and finally, optimizing an estimated value of the speed of the moving target by utilizing the accurate estimated value of the position so as to obtain an accurate estimated value of the speed. The moving target positioning method has the advantages that the position and the speed of the moving target can be accurately estimated; calculation complexity is low; and running time is short.

Description

Technical field [0001] The present invention relates to a target positioning technology, in particular to a mobile target positioning method based on the difference in arrival time and frequency, and the positioning content is the position and speed of the mobile target. Background technique [0002] In recent years, wireless sensor network positioning technology has been widely used in many fields, and has attracted much attention due to its wide application. Wireless positioning has played an important role in people’s lives and can quickly and easily realize geographic measurement, navigation, and Emergency rescue, target tracking, etc. In many practical applications, the unknown target is not static, that is, the unknown target is a moving target. It is very important to accurately estimate the position of the moving target and also estimate the speed of the moving target. Therefore, it is very important for high-precision mobile in wireless sensor networks. The research of ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a moving target positioning method based on time difference of arrival and frequency difference of arrival, which can also locate the moving target when the moving target is distributed outside the mobile sensor and the noise in the wireless sensor network is relatively large. Precise estimation of the position and velocity of the system can solve the global optimal solution, avoiding the problems of local convergence and divergence, and has low computational complexity and short running time

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