A Method for Unambiguous Positioning of High Repetition Frequency Signals in Long Baseline Time-of-Flight Positioning System

Abstract

The invention provides a method for solving location ambiguity of high-repetition frequency signals through the utilization of the consistency of trace modulation of radial deflection of a moving radiation source target and the arrival time of pulses. Through the method, false locating points of a high-repetition frequency target can be well distinguished, and solving time different ambiguity on the target can be achieved in a short time. A specific achievement frame is designed according to the consistency of the trace modulation of the radial deflection and the arrival time of the pulses to complete several key steps of pretreatment of deblurring treatment, trace point correlation, radial deflection amount calculation, and location deblurring. On the condition that the time determination error is smaller than 30ns, as long as the target has a certain radial speed, false locating tracks caused by wrong high-repetition frequency pulse pairing can be distinguished, and the computation time complexity is small.

Description

technical field [0001] The invention relates to a method for realizing de-blurring high-repeat-frequency signal positioning, in particular to preprocessing of fuzzy processing, dot-track correlation, radial offset calculation, and key algorithms for positioning de-blurring. Background technique [0002] Time-difference positioning is a passive positioning technology that uses the time difference of the same radiation source signal to arrive at multiple stations to form a hyperbola (surface) for positioning. Due to its high positioning accuracy and simple positioning algorithm, long-baseline time-of-flight positioning has been widely used in engineering realization. However, the long-baseline jet-difference system has an inherent problem of jet-difference location ambiguity. On the one hand, it is due to the multi-solution problem of the hyperbolic (surface) crossing positioning equation; on the other hand, it is the pulse pairing fuzzy problem, especially when the radiation...

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Problems solved by technology

[0004] The above method solves the problem of time difference positioning ambiguity to a certain extent, but there are still some problems to be solved for high repetition frequency signal positioning ambiguity: 1) The multiple positioning method requires a large amount of calculation, requires multiple sets of position data, and the required positioning time 2) The method of adding auxiliary direction finding to the main station to solve the problem of high repetition frequency positioning ambiguity can remove part of the ambiguity, but due to the direction finding antenna lobe The width is difficult to be very narrow in the broadband, and the sidelobe is difficult to be very low, which will lead to some additional false targets, and due to the scanning of the direction finding antenna, the probability of intercepting the target signal at the same time as the time difference antenna is reduced, and the deblurring effect is increased. Difficulty. At the same time, for the situation where the false positioning point and the target position are in the same direction, the false positioning point cannot be completely distinguished due to the limited accuracy; 3) The Doppler frequency difference positioning solution needs multiple iterations, there is no analytical solution, and the time difference combination Doppler frequency difference positioning algorithm has high computational complexity

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