Abstract:
It's necessary to evaluate the performance of satellite navigation receivers regularly. Due to the limitation of available instruments and related measuring methods, however, It is very difficult to verify the precision of motion velocity measurement of the receivers. For this reason, one of the measurement methodologies for dynamic measuring implemented by navigation receiver is reported on the background of global positioning system (GPS). The principle for passive motion velocity measuring of navigation receivers is discussed, and the fundamental architecture of navigation signal simulator which imitates and generates satellite signals is analyzed. An expected carrier wave frequency-shifting, by which the theoretic values of motion velocity would be derived, can be obtained via careful adjustment of time delay of the navigation signal simulator, and the measurement precision of receivers can be sequentially certificated via comparing the theoretic values with practical measured values. Provided with the preceding arguments, an approach for precision measurement of motion velocity is eventually presented based on the simulator.