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.%针对基于极化敏感阵列的传统投影滤波中阵列结构设备量大、对极化参数要求高以及无法确定滤波损失量等问题，以交替极化敏感阵列为信号接收模型，在设备量减半的情况下也可有效滤波，解决了极化敏感阵列结构性价比较低的问题。同时对传统投影滤波算法做了改进，新的斜投影滤波在期望信号极化参数未知的情况下推导出斜投影滤波算子，再利用该算子提取干扰信号，然后利用对消原理获取纯净的期望信号，有效地解决了传统斜投影滤波对极化参数要求较高的问题；而新的正交投影滤波通过构造正交投影滤波算子，可以确定滤波损失量的变化情况。分析结果表明：改进的斜投影滤波，可以有效地滤除干扰信号，极大地拓展斜投影滤波的限制条件；改进的正交投影滤波可以获得滤波损失量，具有重大的理论意义。
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