Abstract
The pulse signal is widely used in micro-motion feature extraction of rapidly rotating targets as its pulse repetition frequency (PRF) can be high. However, when the pulse signal is implemented in a range-limited anechoic chamber for micro-motion feature extraction, the transmitted and reflected pulse signals may be coupled at the receiver. To solve this problem, the interrupted transmitting and receiving (ITR) method is applied to transmit the pulse signal with hundreds of sub-pulses. The target echo can be received when the sub-pulse is not transmitted. Hence, it avoids the coupling effect of transmitted signals and echoes. Then, the whole process of micro-motion feature extraction for rotating target is proposed based on the ITR method. At last, the simulations and experiments verify that the rotating target micro-Doppler can be extracted by the ITR pulse signal.
Highlights
Radar target feature extraction is widely investigated for automatic target recognition [1,2].The micro-motion feature is one of the most important features [3,4,5]
The pulse repetition frequency (PRF) of typical pulse radar signal may vary from hundreds of Hertz to hundreds of thousands of
The pulse radar signal interrupted transmitting and receiving (ITR) experimental system is established for rotating target micro-motion extraction
Summary
Radar target feature extraction is widely investigated for automatic target recognition [1,2]. The pulse repetition frequency (PRF) of the swept frequency signal in [7] is small for micro-motion feature extraction. The turntable turns continuously so that the dynamic measurement of micro-motional target can be implemented in the anechoic chamber. The inner reason is that the target echoes are received while the pulse is not not completely completely transmitted. As the transmitted and received pulse signals are relevant, they are difficult difficult to be separated by the echo cancellation. The remainder of the paper is pulse radar signal and the characteristics of ITR echo. 3, the procedure of micro-motion pulse radar signal and the characteristics of ITR echo.
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