OFDM雷达通信一体化波形相参积累研究

传统雷达系统不同脉冲发射相同的波形，而在OFDM雷达通信一体化系统中，为了最大化通信数据率，不同脉冲需要发射不同的OFDM雷达通信一体化波形。在进行多脉冲相参积累时，一体化波形不同脉冲间的差异可能会导致目标能量积累性能下降。针对该问题，本文从理论上推导发现，当通信调制信息服从相位均匀分布时，不同脉冲波形在脉冲压缩处理后，主瓣内的相位与时间延迟成线性关系。此外，不同脉冲间，由多普勒引入的相位变化占主导因素，而时域非完全匹配所造成的相位改变可忽略。理论分析和仿真实验表明，OFDM雷达通信一体化波形不会影响目标在主瓣内能量的相参积累。 

A Study for the Coherent Integration with Integrated Radar and Communication Waveform Based on OFDM

In the conventional radar system, the transmitted waveforms in different pulses are same, whereas it transmits different integrated orthogonal frequency division multiplexing (OFDM) waveforms in the integrated radar and communication system to maximize the communication data rate. The diversities in different pulses may result in the performance degeneration of the energy integration of target. For this problem, the derived results in theory enable us to conclude that the variation of phase in the main lobe has a linear relation with time delay after the pulse compression is performed, if the phases of communication modulation information are with uniform distribution. Moreover, among different pulses, compared with the variation of phase caused by unmatched filtering, the variation of phase due to Doppler is dominant. Theoretical analysis and simulation results show that the coherent integration of target energy in the main lob is unable to be influenced by the integrated radar and communication waveform based on OFDM.