INS辅助的卫星接收机高动态信号捕获仿真研究

Simulation research on high-dynamic signal acquisition of INS-aided satellite receiver

由于多普勒频移严重影响信号捕获,因此使用INS辅助的GNSS信号捕获方法,提升接收机性能。通过分析不同精度INS辅助卫星接收机捕获的性能,解决了特定条件下捕获性能问题和惯性器件的选择问题。比较传统捕获算法和INS辅助的捕获方法的基本原理,分析INS速度误差、位置误差对接收机多普勒误差的影响。模拟高动态载体的行驶轨迹,并采用不同精度的INS辅助接收机捕获,获得捕获性能的指标结果,选出最适合需求的INS的精度等级。结果表明,通过选择的INS辅助,提高了接收机对卫星信号的捕获灵敏性,具有极高的性价比;对于高动态应用条件,该结果对组合导航传感器和型号的选择具有指导意义。

Since the signal acquisition is affected by Doppler frequenter shift greatly,the INS-aided GNSS(global navigation satellite system)signal acquiring method is adopted to improve the performance of receiver.The acquisition performance of the INS-aided satellite receivers with different accuracies is analyzed to solve the acquisition problem and inertial device selection problem under the special condition.The basic principles of the traditional acquisition algorithm and INS-aided acquisition algorithm are compared to analyze the influence of INS speed error and position error on Doppler error of the receiver.The traveling trajectory of the high-dynamic carrier is simulated,and acquired by the INS-aided receivers with different accuracies to get the index of the acquisition performance and select the accuracy level most suitable for the INS.The results show that the INS-aided satellite receiver can improve the acquisition sensitivity of the satellite signal,and has high cost performance,which has the guidance significance for the selection of integrated navigation sensor and its type under the condition of high-dynamic applications.