Method for achieving double-station passive positioning through external radiation source at unknown position

Abstract

The invention discloses a method for achieving the double-station passive positioning through an external radiation source at an unknown position. Based on the principle that the radial distances, detected by two detection platforms at the same time, between the external radiation source and a target are definitely equal for the same external radiation source, the method comprises the steps: respectively obtaining a radial distance analytical equation between the external radiation source and the target through a T-R double-base-station positioning method based on time difference and azimuth measurement when each station performs independent positioning; taking a baseline distance between an unknown external radiation source and a detection station in a range finding equation as a continuously changing parameter variable; carrying out the traversing of all possible baseline distances, and carrying out the differential calculation of all obtained radial distance sequences calculated bytwo stations independently; finally determining the radial distance between the target and the external radiation source directly through searching the minimum difference value, and determining the baseline distances between the detection stations and the external radiation source through a serial number. Based on the above, the method can achieve the obtaining of the position of the target through a double-base positioning method, and also can achieve the solving of the baseline length between two detection stations.

Description

technical field [0001] The invention relates to radio positioning technology, in particular to a method based on time difference and azimuth measurement and using an external radiation source whose position is unknown to realize dual-station positioning. Background technique [0002] External radiation source positioning is a method of using third-party radiation source signals (such as signals from FM radio stations, TV stations, mobile communication base stations, and navigation satellites) as the illumination source, and only relying on passively receiving reflected signals from the target to achieve target detection. . Since it does not radiate electromagnetic wave energy outward, the external radiation source positioning system has many properties such as low cost, difficult to be found, anti-interference and anti-destruction, etc. It is a research direction that has attracted a lot of attention at home and abroad. [0003] So far, regarding the external radiation sour...

AI Technical Summary

Problems solved by technology

However, in practical applications, in many cases, the distance between the external radiation source and the detection station may not be obtained accurately in real time, that is, the position of the external radiation source is often unknown.

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