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面对日益复杂的电磁环境,将DS/FH混合扩频技术引入航天测控领域是一种尝试.针对DS/FH信号的特点,推导了航天测控背景下的DS/FH混合扩频系统接收机关键节点的数学模型,分析了航天测控应用中由于DS/FH混合扩频信号的相邻跳频频率不同导致附加在载波上的多普勒频率跳变和载波初始相位跳变对混合扩频接收机捕获跟踪的影响,重点分析了载波多普勒频率跳变和载波初始相位跳变对接收机载波跟踪精度的影响;提出了一种减小由于跳频载波初始相位不确定造成相关累积能量损失的方法,并利用跳频图案辅助降低了跳频对混合扩频接收机载波跟踪精度影响,仿真验证了该方法的有效性.
Facing the increasingly complex electromagnetic environment, it is an attempt to introduce DS / FH hybrid spread spectrum technology into the field of space flight measurement and control.According to the characteristics of DS / FH signal, the key of DS / FH hybrid spread spectrum system receiver Node mathematical model, analysis of space flight measurement and control applications due to the DS / FH hybrid spread spectrum adjacent frequency hopping different leads to additional Doppler carrier frequency hopping carrier and the initial phase hopping carrier mixed spread spectrum receiver The impact of acquisition tracking is analyzed. The influence of carrier Doppler frequency hopping and carrier initial phase hopping on receiver carrier tracking accuracy is analyzed. A method is proposed to reduce the related cumulative energy loss due to the uncertainty of the initial phase of carrier frequency hopping Method, and the use of frequency hopping pattern to help reduce the impact of frequency hopping on hybrid spread spectrum receiver carrier tracking accuracy, the simulation results verify the effectiveness of the method.