A Spaceborne Passive Radar Positioning Method Based on GNSS-R Signal Geometric Relationship

Abstract

A satellite-borne passive radar location method based on a GNSS-R (global navigation satellite system-reflection) signal geometrical relationship comprises steps as follows: step one, the moment when a receiver receives a direct signal of a GPS satellite is marked as t1, and the moment when the receiver receives a reflected signal to a target by a related GPRS satellite signal is marked as t2; step two, a direct path length L and a reflection path length D of the signal are calculated according to the arrival moment of the signal; step three, the position coordinate T ( xt, yt, zt) and the position coordinate R (xr, yr, zr) of a transmitter and the receiver are calculated; step four, the included angle alpha between the direct signal and the reflected signal is calculated, and the vector of the reflected signal is determined; step five, the vector of the reflected signal is lengthened to the point N in the transmission direction, so that the distance between R of the receiver and the point N is equal to the distance of the reflected signal path, and a coordinate of N is calculated; step six, a midpoint of a vector TN from T of the transmitter to the point N is set to be M, and a coordinate of M is calculated; and step seven, a TN vertical line passing the point M is drawn on a plane TRN, the vertical line intersects with a vector RN at the point P which is the position of the target at the moment, and a coordinate of the point P is calculated. According to the method, the calculation difficulty is reduced, the location efficiency is improved, and the location cost is reduced.

Description

(1) Technical field: [0001] The invention relates to a single-satellite passive radar sea surface and offshore target positioning method, in particular to the geometric relationship between the receiver, the transmitter and the target based on the Global Navigation Satellite System Reflect signal (GNSS-R) The positioning method can be used for low-altitude offshore targets and single target positioning on the sea surface, and is suitable for passive radar receivers with rotating receiving antennas or systems with angle measurement functions. The method can realize simple and efficient single-satellite positioning, and belongs to the technical field of wireless communication. (2) Technical background: [0002] Radar systems are an important pillar of homeland air defense. Since they were officially equipped in the 1940s, they have played an important role in target detection, positioning and tracking due to their advantages such as long range, all-weather, and little impact o...

AI Technical Summary

Problems solved by technology

Most of the current positioning methods use the time delay difference between the reflected signal and the direct signal to list the nonlinear equations, and use the redundancy in the equations to convert the nonlinear equations into linear equations for calculation or positioning based on the measured Doppler parameters. The principle of the class positioning method is simple, but due to too many parameters, the complexity of the positioning algorithm is increased, and a large number of measurement errors are introduced

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