旋转状态下GPS中频信号仿真研究

Simulation of GPS IF Signal in a Spinning State

GPS技术在导弹制导、新型引信等高动态自旋载体中的应用时,天线的旋转导致接收到的信号被幅度调制,且载波多普勒频移变化有着一定的复杂性。考虑到实际中真实的高动态旋转状态下的信号难以采集到,提出了对信号进行数学建模后利用软件生成的方法。以安装在旋转载体上的单个GPS天线接收到的信号为研究对象,通过对载体的运动模型和中频信号参数的研究,给出了旋转状态下GPS中频信号的生成模型,并在研究的基础上对信号进行了仿真实现。仿真结果对研究弹载、箭载等GPS接收机有重要的理论研究价值。

When GPS is applied in highly dynamic spinning situation such as in projectile and trajectory correction fuze, the magnitude of the GPS signal will be modulated and the Doppler frequency shifts of GPS signals will become complicated due to the spinning antenna. As GPS signals in spinning carriers are difficult to collect, to facilitate research in these areas, this paper proposes a software signal simulator based on mathematics modeling and analysis of Intermediate frequency （IF） signals of a single spinning GPS antenna. Based on signals captured by a GPS antenna of a spinning cartier, this paper gives an algorithm of IF signal generation for the spinning carrier by researching carrier＇s motion model and IF signal parameters. The signal simulator was realized and simulation was conducted, which proved the effectiveness of this method for researching GPS receivers in projectiles or missiles.