Projection Filtering Performance of Alternate Polarization Array

In view of the traditional projection filtering algorithm based on polarization sensitive array, there are some problems like the large structure of the array, the high demands of polarization parameters and the uncertainty of filter loss.In this paper, alternate polarization sensitive array was chosen as signal reception model. With half equipment, the model can filter the interference signal effectively,which solved the problem of low cost structure of polarization array. Meanwhile, traditional projection filtering algorithm was improved. While oblique projection filter with unknown expected signal polarization parameters, the oblique projection filtering operator was deduced. Then the acquired operator was used to extract the interference signal, and the principle of elimination was used to obtain pure expected signal,which effectively solved the high polarization parameter demands in traditional filter. With regard to the new orthogonal projection filter, which cannot be quantitatively analyzed, an orthogonal projection filter operator was constructed to obtain the changes of filter loss. Further analysis shows that the improved oblique projection filtering can filter out the interference signal, which greatly expands the limits of the projection filtering. The improved orthogonal projection filtering make quantitative analysis of the loss of the desired signal, which has great theoretical significance.