为在较小的系统增益下最大程度地降低多址干扰的影响，提出了一种结合Chirp率和Chirp 信号初始相位的、基于二变量Chirp 调制的多址接入技术．在多址Chirp 信号的Chirp 率之差很小的情况下，利用相位参量保证多址信号间的正交性．文中探讨了多址用户的Chirp 信号互相关性对系统误码率的影响，并对引入初始相位在构建多址接入信号基过程中的优势进行了分析．仿真结果表明，与现有的利用Chirp 扩频的多址接入技术相比，文中提出的多址接入技术可以有效地抑制多址干扰，在不明显降低系统误码率性能的前提下容纳更多用户同时接入系统．

Proposed in this paper is a multiple access technology based on bivariate Chirp modulation,which makes use of both the Chirp rate and the initial Chirp phase to furtherest suppress the multiple access interference with small system gain. When the Chirp rate differences are small,this method can ensure the orthogonality of multiple access signals by distinguishing different initial phases. Moreover,the effect of the mutual correlation of multiple access users' Chirp signals on the bit error rate ( BER) is discussed,and the superiority of the initial phase factor in constructing the multiple access signal basis is analyzed, Simulated results show that,as compared with the existing multiple access technologies based on Chirp spread spectrum,the proposed one is more effective because it suppresses the multiple access interference and permits more multiple access users to simultaneously access the system without obviously degrading the BER performance.