基于 OFDM 的雷达通信一体化波形模糊函数分析

摘要

In the integrated radar and communication system based on the orthogonal frequency division multiplexing (OFDM)waveform,the communication modulation information has great influence on the ambigu-ity function.To solve this problem,the specific expression of the ambiguity function is derived,which proceeds from the signal model of the integrated radar and communication system based on OFDM.Moreover,the effect of communication modulation information on the ambiguity function is discussed.Then,a novel method of com-munication information pre-modulation is proposed.The communication information of different OFDM symbols possesses excellent aperiodic auto and cross correlated properties.Theoretical analysis and simulation results show that the proposed method can effectively deal with the problem that the ambiguity function of the integrat-ed waveform is sensitive to the communication information.%在采用OFDM信号实现雷达通信一体化中，通信调制信息会影响一体化波形的模糊函数。针对此问题，结合基于 OFDM 的雷达通信一体化信号模型，给出了模糊函数的具体形式；讨论了通信调制信息对一体化信号模糊函数的影响；进而提出对通信信息进行预调制的方法，使同一脉冲不同 OFDM 符号间所调制的通信信息尽可能地具有优良的非周期自相关和互相关特性。理论分析和仿真实验表明，所提方法能很好解决一体化波形模糊函数对通信调制信息敏感的问题。