Space synchronizing method of bistatic synthetic aperture radar (BiSAR) with unknown target position coordinates

Abstract

The invention belongs to the technical field of bistatic synthetic aperture radar (BiSAR) transmitting and receiving, and discloses a space synchronizing method of a BiSAR with unknown target position coordinates. The method comprises the steps that initialization processing is conducted; according to a transmitter, the unit direction vector of antenna orientation is determined, the vector of a carrier coordinate system and the vector of a geographic coordinate system are converted, the vector of the transmitter to the center of a target area is determined, the geographic coordinate system and an earth coordinate system are converted, the vector of the transmitter under the earth coordinate system is determined, and the position vector of the center of the target area is determined; according to a receiver, the position vector of the receiver on the earth coordinate system is determined, the pointing vector of the receiver which points to the center of the target area is determined, the pointing vector under the geographic coordinate system is determined, the pointing vector under the carrier coordinate system is determined, and thus antenna orientation space synchronization of the receiver and the transmitter is achieved. The space synchronizing method of the BiSAR with the unknown target position coordinates has the advantages that the space synchronizing efficiency of the BiSAR can be effectively improved, the accuracy is high, the airplane mode is flexible, and the method is beneficial to being widely used.

Description

technical field [0001] The invention belongs to the technical field of bistatic synthetic aperture radar (Bistatic Synthetic Aperture Radar, BiSAR) transmission and reception; in particular, a method for spatial synchronization of bistatic synthetic aperture radar when the exact coordinate position of a target is unknown. Background technique [0002] Synthetic Aperture Radar (SAR) has excellent performance in all-day and all-weather high-resolution imaging and precise positioning of terrain features or ground targets. However, since the launching platform and receiving platform of monostatic SAR share the same carrier, its concealment is poor, and it is easy to be detected and interfered by the enemy. Bistatic Synthetic Aperture Radar (BiSAR)'s launch platform and receiver platform are placed on different carriers. Compared with monostatic SAR, it can obtain richer target information and longer range. At the same time, since the receiving platform is in a passive receiving...

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Problems solved by technology

The disadvantage of this method is that before the antenna beam pointing control, the accurate WGS-84 coordinate parameters (including longitude, latitude and altitude) of the point target must be obtained, and in this method, the transmitter and receiver adopt In the same coordinate transformation algorithm, the WGS-84 coordinates of point targets are an indispensable input parameter in the coordinate transformation algorithm; in practical applications, bistatic SAR needs to image any area, and when the accurate coordinate position parameters of these areas This method cannot be processed when it is unknown; in addition, since this method only images point target areas with definite coordinate position parameters, its application range is severely limited. The coordinates are required to be accurate, and it is difficult to be effectively applied in practice.

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