基于调零天线的无人机抗导航干扰方法

针对无人机在卫星导航拒止环境下利用真实卫星信号导航定位的需求,提出一种基于调零天线的无人机抗导航干扰方法。首先,分析卫星导航压制和欺骗干扰的特点;其次,建立抗干扰模型,抗压制干扰的方法是使用调零天线零陷信号功率,抗欺骗干扰的方法是通过无人机特定的运动,计算位移得到的多普勒和载波跟踪环得到的多普勒之差,并与无人机运动变化进行对比,选定门限判定每颗卫星信号是否为欺骗干扰信号,标记并去除欺骗干扰信号;最后,在欺骗干扰信号和真实信号同时存在的情况下,利用基于Matlab的GPS软件接收机,半物理仿真验证欺骗干扰和抗欺骗干扰的效果,该方法达到了在压制干扰和欺骗干扰环境中利用真实卫星信号定位的目的,可应用于民用和军用卫星导航压制和欺骗干扰中。

Navigation signal structure based on complex carrier modulation

Signal structure design is an important part of satellite navigation system research,which directly affects navigation performance.Signal performance parameters are analyzed and performances of BPSK modulated signals and BOC modulated signals are compared.Aiming at requirements of high navigation precision and high anti-jamming ability,a new navigation signal structure based on complex carrier modulation is proposed and performances of the signal are researched with different parameters.A synchronization algorithm is put forward according to the signal characteristics,and the synchronization performance is qualitatively analyzed.Next,the applications of the complex carrier modulated signal are discussed,which include anti-jamming,navigation enhancement,power combing and so on.Simulations and analysis show that the proposed navigation signal structure based on complex carrier modulation has good navigation capabilities and anti-jamming abilities,which deserves further study.