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Low-angle tracking algorithm using polarisation sensitive array is proposed for very-high frequency radar. First, the receiving signal model is established in multipath environment based on the complex reflection coefficient model. Then the decorrelating efficiency of polarisation smoothing (PS) is presented by analysing the condition number of envelop covariance matrix by PS. After that, the PS-MUSIC algorithm which combines the PS preprocessing and the MUSIC algorithm is established. Its performances, in terms of the signal-to-noise ratio, elevation angle of target and polarisation angle, are evaluated by simulations. The PS-MUSIC algorithm needs only a few snapshots or even a single one. This method can work well in a narrow band system and is not restrained by array configuration. It can also be applied in other scenarios, where multipath effect is serious.

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Abstract-An optimum polarization-space-time joint domain processing (PST-JDP) technique is proposed for clutter suppression which adequately adopts the three-domain information including the polarization, space and Doppler frequency information of the radar echo. The study shows that the polarization information together with the space and Doppler frequency information are effective to significantly enhance the clutter suppression performance for airborne radar. Several new techniques, (i.e., the covariance matrix eigendecomposition, the spectral analysis and the resolution grid method), are utilized for deriving the performance of the optimum PST-JDP. The main factors which affect on the performance of clutter rejection are the clutter degree of polarization, statistical distance of polarization between target and clutter, Doppler frequency of target and input clutter-to-noise ratio. The new optimum PST-JDP method outperforms significantly the traditional optimum space-time processing technology, especially in the case of the slowly or tangentially moving target. The simulation verifies the correctness and efficiency of the model.