**4. Experimental Results**

### *4.1. Dataset Details*

In experiments, the parameters of radar, transmitting signal and aircraft targets are the same as those in Section 2.1. In this paper, several groups of comparative experiments are constructed where the noise is all considered for classification probability. In the classification experiment of complete echo data, we simulate 200 single-wave gate complete echo signal samples for each aircraft target as the dataset where one complete signal sample corresponds to one radar observation angle. While the sparse echo data of multi-wave gates continuously are simulated in one angle in the classification experiment of sparse echo data, in other words, the dataset contains 200 multi-wave gates sparse echo signal samples for each aircraft target. What we want to emphasize is that the testing dataset are completely different from the training dataset with different aircraft target distance and view angle, and the aircraft target correct classification probability can be obtained by comparing the classification result of the SVM model with the real label of the aircraft target, which is equal to the number of correctly classified samples divided by the total number of samples.
