Performance evaluation of a terrain-aided navigation system under different accuracy of sensor

In order to select the type of the sensor, improve the terrain-aided navigation(TAN) algorithm, and do research on the reliability of the TAN system, the influence of the sensor's accuracy on the match probability was studied in the TAN. Based on different terrain, the factors that impact on match probability were analyzed, which are barometer error, radar altimeter error, velocity error, and heading angle error. The error range of sensors was determined by simulation computing in practical system. A simulation experimentation was implemented by using the digital map of hills, mountains and high mountains. The simulation results shows that TAN system allows the velocity error<2.2 m/s, the heading angle error<0.6° and standard deviation of altimeter noise<16.4 m, when the match probability is > 90%.