Passive positioning technology based on difference measurement

Abstract

The invention discloses a method for realizing high-precision distance measurement through measuring a phase difference. First of all, by use of a function relation between a phase shift and a frequency shift, an airborne distance measurement formula led out from a Doppler equation is converted to a method for positioning a fixed object by an airborne single station only on the basis of the difference measurement. Based on this, on one hand, based on a characteristic that an airborne difference distance measurement solution is irrelevant to the motion speed of a detection platform itself, and on the other hand, through comparing with an approximate expression, obtained through derivation based on a difference positioning equation, of a strict distance measurement solution, an airborne difference passive distance measurement method is further developed to a double-station positioning method which is not only restricted to motion states of the platform itself, but also can perform real-time detection on maneuvering objects. Since error measuring equation of the difference distance measurement solution is irrelevant to a huge-magnitude light velocity, compared to a time difference positioning technology, better positioning precision can be obtained through fewer sites by use of difference positioning. A result given by use of the method definitely explores a new research direction for the development of a positioning technology.

Description

technical field [0001] The invention belongs to the technical field of radio positioning measurement, and in particular relates to a method for realizing long-distance and high-precision distance measurement by applying phase difference measurement technology. Background technique [0002] Passive positioning itself does not emit signals. It obtains the position and parameter information of the target through the search, measurement and processing of the electromagnetic signal radiated by the target, and further obtains the track of the target. Passive positioning has the characteristics of long range and good concealment. Under the current technical conditions, multi-station passive positioning technology is still a more effective long-distance passive detection and positioning method. Among them, the time difference positioning system has become a main direction of passive system development because of its advantages such as good positioning accuracy and high spatial reso...

AI Technical Summary

Problems solved by technology

[0006] 2. The distance between stations must be long enough

For this reason, in actual engineering, the station layout and addressing of the time difference positioning system is often a relatively difficult task

[0007] 3. Positioning ambiguity for high repetition frequency signals

High repetition rate pulses cause measurement ambiguity and leave a few echo pulses unpaired during the identification process

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