A delay estimation correction method and system for improving baseline positioning robustness

Abstract

Embodiments of the present invention provide a time delay estimation correction method and system for improving the robustness of baseline positioning. The method uses the direction finding solution model to obtain the tolerance of the direction finding to the time delay estimation accuracy and the direction finding solution model. Tolerance of random noise, and correspondingly obtain the first and second delay estimation intervals; from these two intervals, obtain the third delay estimation interval; from the angle measurement value and array relationship corresponding to the delay estimation of the second measurement dimension A direction-finding estimated value corresponding to the first measurement dimension is obtained; a time delay estimated value of the first measurement dimension is obtained from the direction-finding estimated value, and a received signal of the first measurement dimension is corrected by using the time delay estimated value. The correction method of the invention improves the robustness of the baseline positioning and direction finding under the environment of low signal-to-noise ratio without increasing the aperture of the baseline and the complexity of the model.

Description

technical field [0001] The invention belongs to the field of positioning and navigation, and in particular relates to a time delay estimation correction method and system for improving the robustness of baseline positioning. Background technique [0002] In active and passive baseline positioning systems in the fields of underwater acoustics, air acoustics, electromagnetics, and radio, one of the core technologies for direction finding, ranging, and signal parameter measurement is signal delay estimation. [0003] The time delay estimation algorithm is to estimate the time delay difference of received signals between different array elements in a linear array, a planar array or a three-dimensional array, and then input it into a specific direction finding calculation model to complete direction finding, ranging, or in Some motion imaging equipment completes signal processing tasks such as motion compensation. [0004] Commonly used time delay estimation methods include corr...

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Problems solved by technology

[0006] Embodiments of the present invention provide a time delay estimation correction method and system for improving the robustness of baseline positioning to solve the technical problem of low accuracy and robustness of time delay estimation

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