Radar beyond visual range base line passive cooperative localization method

Abstract

The invention relates to a passive cooperative localization method for a radiation source target at sea according to observed values of double-station radars under the condition of the beyond visual range base line. Aiming at the problem that as under the influence from the earth curvature under the condition of the beyond visual range base line, the base line between the double-station radars is lengthened and angle measurement errors are introduced, the localization precision is poor, the passive cooperative localization method applicable to the beyond visual range base line is adopted to amend the radar measurement errors introduced by the earth curvature to achieve localization. The method comprises the specific steps that (1), coordinates of radar stations 1 and 2 are converted; (2), the detection range of a virtual target is generated initially; (3), the position offset of the virtual target relative to the station 1 is calculated; (4), the coordinates of the virtual target are calculated; (5), the observed value of the virtual target by the station 2 is calculated; (6), the measurement errors are judged; (7), the detection range of the virtual target is updated; (8), a localization result is output. By means of the method, the radar measurement errors introduced by the earth curvature can be amended, and the precision of the radar beyond visual range base line passive cooperative localization is improved effectively.

Description

technical field [0001] The invention relates to a radar passive cooperative positioning method, in particular to a method for performing cooperative positioning after passive detection of a sea radiation source target by a dual-station radar in the case of an over-the-horizon baseline. Background technique [0002] Passive positioning is different from active positioning. Passive positioning means that the positioning system detects the existence of the target by obtaining the electromagnetic signal radiated by the target itself or the external radiation source signal reflected by the target, obtains the information of the target, and gives the spatial coordinates of the target with a certain accuracy. Because the positioning system itself does not radiate electromagnetic signals when it is working, but only receives electromagnetic signals, it is called a passive positioning system. The active positioning system locates the target according to the distance and bearing info...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the long baseline situation where the radar distance exceeds the line of sight range, and when the direction-finding cross-location method is used for dual-station coordinated positioning, the angle measurement error is introduced due to the curvature of the earth, resulting in poor positioning accuracy, which cannot meet the actual positioning accuracy The shortcomings of the requirements, by combining a variety of coordinate transformation methods with the virtual target point search and positioning method, a radar long baseline passive cooperative positioning method is proposed

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