一种基于随机序列的正交离散频率编码信号

Orthogonal discrete frequency coding signal based on random sequence

针对正交离散频率编码信号已有设计方法编码长度和数量受限、生成信号彼此正交性较弱等问题,该文利用线性同余随机序列随机性强的特点,提出了基于随机序列的正交离散频率编码信号设计方法。在此基础上,推导了离散频率编码信号的模糊函数,分析了信号的时延、多普勒测量精度和信号集的正交性,并通过仿真实验比较了基于随机序列和基于混沌序列设计的离散频率编码信号的正交性特性。理论分析和仿真实验表明,基于随机序列的正交离散频率编码信号具有更优良的模糊函数,信号彼此间的正交性特性更好,且易于设计和实现。

Given that problems exist in the current design of orthogonal discrete frequency coding signals,such as limited coding length and signal number,a kind of method based on a linear congruential generator,which has strong randomness,is proposed in this paper.Then,the time-Doppler ambiguity function of the designed signal is introduced in detail,the measuring accuracy of time delay and Doppler as well as the orthogonal property is analyzed based on the model proposed in this paper.Signal performances are compared between the paper’s method and the one based on chaotic sequences by simulations.The proposed signals present good performances in ambiguity function,better orthogonal quality and the ability to be programmed easily in theory and simulations.