space pursing synchronization method of airborne bistatic synthetic aperture radar (SAR) beam

Abstract

The invention discloses a space pursing synchronization method of an airborne bistatic synthetic aperture radar (SAR) beam. The space pursing synchronization method of the airborne bistatic SAR beam particularly includes that a pursing radar sends an antenna beam, accurately calculating an azimuth angle of the antenna beam or a pitch angle of the antenna beam when an antenna beam of a receiving station is directed at a cover area of an antenna beam of a sending station, or meanwhile calculating the azimuth angle of the antenna beam and the pitch angle of the antenna beam simultaneously, and therefore the antenna beam of the receiving station can be accurately directed at the center of the antenna beam of the sending station, the accurate alignment of the antenna beam receiving and sending of an airborne bistatic SAR is achieved, and the space synchronization of the bistatic SAR is completed. The pursing space synchronization method of the airborne bistatic SAR beam solves the problem that in the prior method, an antenna directing control parameter has a big error, an enough coincided area of the received and sent antenna beams is guaranteed, and a security function for bistatic SAR imaging occurs.

Description

Technical field [0001] The invention belongs to the technical field of space synchronization in a radar system, and particularly relates to an airborne bistatic synthetic aperture radar (Synthetic Aperture Radar, SAR) beam chasing space synchronization method. Background technique [0002] Bistatic SAR is a new synthetic aperture radar with separate receivers and transmitters. It has different spatial geometric coordinate relationships, anti-jamming performance, concealment, and strong anti-interception capabilities. Bistatic SAR includes systems such as satellite-borne bistatic SAR for satellite launch and satellite reception, satellite-to-aircraft bistatic SAR for satellite launch and aircraft reception, and airborne bistatic SAR for aircraft launch and aircraft reception. [0003] Due to the separate transmission and reception, the airborne bistatic SAR has a new spatial geometry, which brings about the space synchronization problem of the airborne bistatic SAR. Space synchroni...

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Problems solved by technology

[0005] In order to solve the problem that the beam alignment of the receiving and transmitting antennas of the airborne bistatic SAR is not accurate enough, the present invention proposes a beam catching up space synchronization method for the receiving station of the airborne bistatic SAR on the basis of the existing method. The premise is that the beams of the receiving and transmitting antennas have already pointed to the target area, that is, the antenna beams of the transmitting and receiving stations have completed preliminary alignment. the alignment

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