Interval passive positioning method and system based on tdoa

Abstract

The invention discloses an interval passive positioning method based on TDOA (Time Difference Of Arrival, Time Difference of Arrival), which includes: intervals of two TDOA measurement values ​​generated between three observation stations in the observation station group and radiation sources to obtain two TDOA measurement intervals; divide the a priori radiation source position interval evenly into multiple parts to form multiple cutting lines; select the reference observation station to solve the TDOA equation for the cutting line, and find each TDOA measurement interval on each cutting line The discrete intersection points; according to the discrete intersection points on each cutting line, the circumscribed rectangle is drawn as a time difference line interval approximation area; the circumscribed rectangle overlap calculation is performed on all TDOA interval measurements, and the circumscribed rectangle is constructed for the intersecting area; the circumscribed rectangle is used as The new a priori radiation source location interval, after iterative operation, the location interval is continuously narrowed until the area of ​​the circumscribed rectangle converges, and the source location estimation interval is obtained, and the area is taken as the reliability of the algorithm, and the midpoint is taken as the positioning result. The present invention has the advantages of high positioning accuracy, good robustness, and benefits for multi-system fusion.

Description

technical field [0001] The invention relates to the technical field of passive positioning, in particular to a TDOA-based interval passive positioning method and system. Background technique [0002] In the existing environment, such as radar positioning, sound source positioning and other scenarios, when non-cooperative radiation sources are to be located, there is a lack of data transmission cooperation between radiation sources and observation stations, which will bring great difficulties to positioning . At present, passive positioning is mostly based on AOA (Angle Of Arrival, angle of arrival), TDOA, FDOA (Frequency Difference Of Arrival, frequency difference of arrival) and their joint positioning. Like the passive positioning method based on TDOA, the distance between the radiation source and the observation station is not required, and the distance difference or time difference between the radiation source and different observation stations can be obtained only thro...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a TDOA-based interval passive positioning scheme, which combines the interval analysis method, dichotomy method, and iteration method on the basic TDOA positioning principle, and solves the existing passive positioning scheme. There are problems such as limited ability to adapt to noise, and the reliability of numerical positioning results cannot be guaranteed, and the present invention is conducive to multi-system integration, with high precision of positioning results and good robustness, which can ensure the reliability of positioning results, and the equipment complexity is not high , high environmental tolerance

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