Error Analysis And Correction Model Of Satellite Navigation Signal Playback

With the development of satellite navigation technologies and universal application,the satellite navigation system has entered every aspect of the application.Terminal Test is the foundation to improve the performance and ensure the industry application ability.According to the terminal test requirement of Beidou navigation and the globalization promotion of Beidou navigation technology,a testing capability of navigation terminal could be provided according to the requirements of different applications.Since idealized test signal,the idealized definition of dynamic scene,traditional simulator test results can not truly reflect the performance of the receiver.However,the playback testing technology is of great importance to navigation terminal test.Different from the traditional simulator test,the high efficient playback testing technology can not only reflect the key issues,like the terminal performance degradation caused by diversity of environment,the scene adaptability of testing terminal,but also present the variation trend of performance caused by the scene parameter randomness.The aspects mentioned above are those that precede the testing platform based on simulator.Because of these random factors closely related to environment,the existing technology is still unable to provide the precise and effective navigation signal simulation model,which leads to the inconsistency between the terminal performance testing result of and the performance testing result under real environment.Thus,the testing evaluation of navigation terminal will become more difficult.Based on this fact,we need the high fidelity playback of real navigation signals.However,there are still some problems for the realization of playback testing.Firstly,how to combine theoretical analysis and equipment calibration data to establish distortion model? Secondly,how to optimize the collect and playback system parameters in order to reduce the playback signal distortion?The above core issue of the playback testing technology is discussed in the paper.First,the basic principles of satellite navigation is roughly describes,and discussing the principles of the tracking loop that is closely related to positioning error in detail.And more,we analysis playback signal error during collect and playback test various aspects,and then put forward the corresponding theoretical error model.If the playback system does not match against the acquisition system,the corresponding pretreatment techniques are presented.Finally,in order to meet the needs of real-fidelity playback test,using test result of real navigation signal,collect and playback parameters were optimized,and the corresponding positon correction models is proposed.The actual test results be amended so that the receiver test results corrected more accurately characterize the performance of the receiver.