中文摘要：

针对差分混沌键控（DCSK）的保密性低,数据传输速率不高等缺点,这里设计并研究了一种新的混沌键控调制方式—调频相关延迟键控（FM-CDSK）通信方案,该方案同时兼具CDSK和FM-DCSK的优点。通过仿真分析验证了该系统在数据传输速率和保密性等方面较DCSK和CDSK都有所提高,传输速率更是比原有键控方式提高了2倍,并且利用该混沌调制方式很好的实现了图像信号的保密传输,验证了该系统在数字保密通信中的可实现性。

英文摘要：

For the low security and low data transfer rate of DCSK（differential chaos shift keying）,a novel chaotic shift keying digital modulation scheme-FM-CDSK（frequency-modulated differential chaotic shift keying） is designed and studied.The scheme has the merits of both CDSK and FM-DCSK.The simulation analysis of data transmission rate and confidentiality indicates that this new scheme is of much better performance than DCSK and CDSK,and the transmission rate is twice as much as original shift keying schemes.Meanwhile,this novel chaotic shift keying scheme could perfectly implement secure transmission of the image signal.Simulation verifies that this scheme is feasible in digital secure communication.