The Research Of The High Dynamic Satellite Signal Simulator's Software

As the self-development satellite navigation, BD-2 satellite navigation system has an important significance to the development of our military,economy and science. The high dynamic satellite signal simulator is one of the most important equipments which are used to develop,construct and test the whole system.The high dynamic satellite signal simulator can generate satellite signal precisely based on the receiver's dynamic environment. The simulator can test the function of the receiver; judge the precision of the receiver, which is an indispensable equipment in the process of developing the high dynamic receiver.The high dynamic satellite signal simulator is composed of 12 channels satellite signal generator, and simulating software. The simulating software running on the computer completes defining the environment of the receiver, setting the satellite constellation characteristic, processing signal and data communication.The paper, firstly, introduces the math model of the simulator and its composing. Then basing on the modern thought of software engineering, the paper designs the frame of the simulating software and describes the working process and module division. Furthermore the paper gives the function models of the software and analyzes the math model of every function model: including pseudo-range changing model, receiver movement model, error computing model, parameter computing method. Subsequently, discuss the communication technique of EZ-USB equipment, which is the communication interface between the signal simulator and simulating software. In the end, combining the project practice, the paper displays the working states of the software.The whole software experiences the scheme-bringing, math model-constructing, programmed-realizing phases. The testing result coming from receiver proves the scheme reasonable and math model correct.