根据雷达通信一体化应用需求,提出了副载波和非均衡四相键控(UQPSK)调制两种波形,分析了副载波信号的模糊函数,对副载波和UQPSK信号的模糊函数和脉压结果进行了仿真。通过合理分配通信信号和雷达信号的功率,两种波形均可以实现雷达与通信信号的同时传输。副载波信号采用线性/非线性调频,对多普勒不敏感,雷达处理相对比较简单,但频谱的效率却比较低。UQPSK信号虽然提高了频谱效率,但存在码间串扰,并且由于使用二元伪随机序列,波形对多普勒较敏感。

To satisfy the demand for application of radar-communication integration, two waveforms of sub-carrier and UQPSK modulation are proposed in this paper, the ambiguity function of sub-carrier signals is analyzed, and the simulation of the ambiguity function and pulse compression results is presented. Both waveforms allow simultaneous radar-communication signal transmission if power is properly allocated to each kind of signals. Adopting LFM/ NLFM, sub-carrier signals are insensitive to Doppler and can be processed by radar easily, but the cost of spectral efficiency is low. UQPSK signals, with higher spectral efficiency, may produce intersymbol interference when processed and the waveform is sensitive to Doppler due to the pseudo-random sequence.