Experimental Study On Spaceborne Two - Dimensional Adaptive Signal Processing Of Airborne Radar

When radars look-down,the intensity of ground clutter can achieve 60～90dB, The radial velocity and Doppler spectrum width vary from different directions, it will effect the detection ability of the radar seriously. The performance of traditional MTI, MTD radars with single channel decline. The radar system with single channel cannot satisfy the demand. Therefore, the space-time adaptive processing has drawn much attention. The space-time adaptive processing algorithm and its structure are researched aiming at the ground moving target indication (GMTI) mode in the project of the airborne radar for long-distance battle field scout. It is one of the main tasks to improve the detection and tracking abilities in clutter environment. It is significative to process the practical data with different STAP algorithms for the utilization of STAP algorithms in engineering.This paper mainly analyses the technology of clutter suppression in the airborne radar. The technology characteristic and realization method of pulse compression and moving target detection are analyzed firstly. The STAP algorithms, structures and processing ideas of airborne radar are studied. In the clutter suppression techniques of airborne radar, DPCA, ADPCA, PI-STAP and multi-dimension Capon methods are involved from the view of engineering realization..The routine moving target detection algorithms are expatiated from the view of engineering realization.It introduces the FIR filters for processing pulse group and cell average select maximum CFAR.The nocorrelative accumulator are introduced and the corresponding processing figures are given.In this paper, the channel equalization and main clutter tracking techniques are analyzed.In airborne phase arrary radar. The consistency of incongruous of amplitude and phase among channels will effect the signal processing performance of array signal processor.In GMTI processor,the in-consistency of amplitude and phase will induce the zero point not deep enough and the notch not narrow enough in the different beam after sum-difference beam-forming.It will directly effect the detecting capability and clutter suppression of ADPCA and other techniques that utilize the information of sum-difference beam.So we must process the channel equalizer.Because the airborne radar’s transmitting and receiving is beamed,so the main clutter is very powerful,the powerful clutter will directly effect the detection of moving target.So we must finish the main clutter tracking to fulfil the suppression the main clutter.In this paper, three times filight expriementations in GMTI mode are introduced.We analyze and compare the echo data gathered from three experimentations, the following conclusions are drawn:ADPCA algorithm:the average of clutter suppression maximum is 31.67dB, the minimum is 20.4dB;PI-STAP algorithm:the average of clutter suppression maximum is 36.1dB, the minimum is 30.3dB;Therefore, the ground clutter suppression performance of PI-STAP is better.