Research On The Ground-Target Location Methods Based On The Bistatic SAR

The location technology based on synthetic aperture radar (SAR) system is being widely appliedin the fields of military and civilian that can guide the aircraft to finish targets attacking or materialsreleasing. In the beginning, the location technology based on the monostatic SAR, however, alongwith the revival of the bistatic SAR (BiSAR), many scholars putted forward that we can locate thetargets using BiSAR system, which has the separation of transmitter and receiver, has someadvantages like the more abundant information contents of echo data, longer operating range, strongeranti-interference and anti-capture, suggest a wide application field in positioning. The imagingalgorithms and location methods of the BiSAR system are emphasized in this paper. The maincontents are:Chapter I introduces the status and the developments of BiSAR. The application of SAR in thenavigation is also explored in this chapter. Finally, the main contents in our research are outlined.Chapter II studies the imaging algorithms of BiSAR. Considering that the location technology ofSAR has to use the priori information of the BiSAR imaging. Several imaging algorithms areintroduced in this chapter. The imaging algorithms are: bistatic linear Range-Doppler algorithm basedon the turntable imaging and the polar format algorithm. Finally, demonstrate the effectiveness of thethree algorithms by simulation results.Chapter III studies on the location methods base on the BiSAR system. The separation of thetransmitter and the receiver causes the non-linearization of the Range-Doppler equations, whichmakes it difficult to obtain the positions of the targets. This chapter introduces several methods tolocalize targets: the Newton-Iteration, the dichotomy and the method using the equivalent phasecenter principle; then introduces localization methods in the more base stations, such as Lagrangemethod, spherical-interpolation method and the spherical-intersection method. Finally, the simulationresults are given to demonstrate the effectiveness of the proposed methods.Chapter IV analyzes the positioning accuracy when the motion parameters which are offered bythe navigation system have some errors. The imaging quality and the position accuracy are discussedwhen there are velocity-error and the height-error in the transmitter platform and the receiver platform.The simulation and the theory tell us that the velocity-error has a worse influence on the positionaccuracy compared with the height-error.Chapter V presents the SAR positioning software, which is designed in the VC++6.0.Firstly, introduces the procedure of determining the latitude and longitude information of an arbitrary pixel indetail, Then, introduces the procedure of developing the location software, displays the interface ofthe software and the results at the final.Chapter VI summarizes the whole work of this paper and pointed out the possible direction andthe difficulty problems to be further researched.