Deinterleaving and Parameter Estimation Methods of Radar Signal with Pulse Splitting Based on Intra-Pulse Linear Frequency Modulation

‍ ‍In the uncooperative receiving scenario， for some special signals， pulse splitting phenomenon may be observed when output target data， which makes it impossible to obtain the real parameters of the target in time. This is caused by the fluctuation of the amplitude inside the pulse. When the signal reaches the receiving device， the position with high amplitude of the same pulse exceeds the sensitivity of the receiving device， while the position with low amplitude does not reach the sensitivity. To solve this problem， this paper took radar signal with intra-pulse modulation of linear frequency as an example， deeply analyzed the internal law of radar signal with pulse splitting. Based on this， the deinterleaving and parameter estimation methods of radar signal with pulse splitting was proposed. Firstly， based on the difference of time of arrival （DTOA）， radio frequency （RF） and pulse width （PW） of pulse stream， the bidirectional long short-term memory （BLSTM） was used to learn the complex internal laws of signals， and extract the coupling relationship between multiple parameters. Then the pulse stream with split pulses was deinterleaved with the trained model. Based on the time of arrival （TOA）， RF and PW of the pulse stream after deinterleaving， the real parameters of the radar signal were estimated by clustering and sharing the estimation results between clusters according to the waveform design principle. The simulation results showed that the proposed deinterleaving method has excellent deinterleaving efficiency on the radar pulse splitting signal with linear frequency modulation in the pulse. The parameter estimation method in this paper had ideal estimation results for original signal slope， RF， PW and PRI based on the pulse stream data after deinterleaving.