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

Abstract

An embodiment of the invention provides a time delay estimation correction method and system for improving baseline positioning robustness. The method comprises the following steps: through a direction-finding solution model, obtaining tolerance of direction finding to delay estimation precision and tolerance of the direction-finding solution model to random noise and obtaining a first time delayestimation interval and a second time delay estimation interval correspondingly; obtaining a third time delay estimation interval according to the obtained two time delay estimation intervals; obtaining a direction finding estimated value corresponding to a first measurement dimension according to an angle measurement value corresponding to time delay estimation of a second measurement dimension and array relationship; and obtaining a delay estimated value of a first measurement dimension according to the direction finding estimated value, and correcting a received signal of the first measurement dimension by using the delay estimated value. The correction method improves the robustness of baseline location and direction finding under a low SNR environment without increasing baseline aperture and model complexity.

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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