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Study on Techniques of Accuracy Augmenting and Integrity Monitoring for Satellite Based Navigation System

Author: LiuWenXiang
Tutor: ZhuangZuoWen；WangFeiXue
School: National University of Defense Science and Technology
Course: Information and Communication Engineering
Keywords: Satellite navigation system Accuracy Integrity Multi-frequency ionospheric corrections Inter-satellite links BOC signal distortion Receiver Autonomous Integrity Monitoring Differential coherent detection
CLC: P228.4
Type: PhD thesis
Year: 2011
Downloads: 361
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Abstract


Accuracy and integrity of the satellite navigation system core performance indicators should be designed from the system and institutional clients to deal with two aspects of research to improve the accuracy and integrity of the detection method. Institutional design in satellite navigation system, the introduction of inter-satellite links, multi-frequency navigation signals, BOC modulation, etc., have become an inevitable trend. On the client process, high-precision face ionospheric delay correction, the satellite signal distortion caused by impact analysis, receiver autonomous integrity monitoring (RAIM) and many other issues. In this context, the paper carried out the following five aspects of the research work: (1) the traditional tri-band ionospheric correction method assumes that the three frequency pseudorange measurement variances are equal, but the actual environment, the signal bandwidth and carrier to noise ratio and other factors have led to more frequency pseudorange measurements unequal variance problem, a pseudo-observation variance in the original unequal conditions combined pseudo noise variance smallest tri-band first-order correction algorithms. Compass tri-band and narrow-related GPS pseudorange pseudorange measured three bandwidth-related data validation shows that the optimal noise standard deviation from the traditional methods of 26cm and 64cm, respectively, the new algorithm is reduced to 17cm and 61cm. Carrier applications for precision second-order term residual effects of ionospheric characteristics can not be ignored, for the first time put forward based on the residual noise variance and higher order terms of the multi-frequency correction comprehensive optimization algorithm to overcome the existing types of optimization method is only second order Xiang pseudorange residuals or a combination of lack of noise variance can be changed according to different application requirements to reduce the weighting factor of concern Comprehensive error. (2) for the inter-satellite link signal differential coherent detection method detects the existing theory of probability approximation formula error is larger and intermediate accumulation time constant problem, a simulation calculation of the probability of detection and false alarm probability theory combining mixed calculation methods, and frequency to optimize the accumulation time, compared to the IF accumulation time is fixed at 1ms traditional practices to optimize the detection of loss after the design maximum reduction 2dB. On the false alarm probability is 10 -6 conditions change detection SNR loss with simulation data for the curve fitting, for the typical engineering application scenarios differential coherent detection performance analysis and optimization of analytical model. (3) combined satellite and ground for inter-satellite orbit determination methods consider only the lack of random errors is proposed taking into account the random error and systematic error condition Combined Orbit Determination Error Analysis Modeling and simulation methods, on the basis of analysis of the measurement time accuracy, inter-satellite measurement frequency, poor inter-satellite observation systems and the antenna beam selection of different parameters on the performance of satellite and ground Combined Orbit implications for inter-satellite link parameters designed to provide a more accurate analysis results. Furthermore, the assessment of the inter-satellite link is fixed to the ground as well as some satellite interference region full arc is disturbed either case, orbit determination performance for ISLs entire network robustness and system safety analysis provides support. (4) for the BOC signal distortion model ICAO three kinds of digital distortion does not have the analytical methods and the analysis of impact of BOC signal distortion channel is not considered the lack of non-ideal characteristics, the first digital distortion deduced BOC signal analytic expression crosspower type model, considering the non-ideal characteristics of the channel distortion BOC signal deviation ranging theoretical analysis model. Ideal low-pass filter in the receiver and the group delay of the channel considered non-ideal characteristics in both cases, using the model of the BOC (14,2) and BOC (1,1) of the distortion parameters of the ranging receiver design deviation between. The results showed that: the non-ideal characteristics of the group delay will seriously aggravate BOC (14,2) signal distortion ranging adverse effects to the user; BOC signal to reduce distortion due to the deviation distance, BOC (1,1) non-coherent reception Sooner or later should yard intervals designed to 0.3chip 0 .35 chip. (5) the traditional methods can not effectively detect tiny RAIM pseudorange bias limitations proposed based on the time domain accumulated parity vector improved RAIM (TPV-RAIM) method. In this method, within a few Epoch accumulation vector parity checking, increasing the equivalent pseudorange error and noise ratio, the slight increase of the pseudorange error detection performance, can improve the performance of user location. Simulation experiments under the same detection performance, the method has accumulated 10 epochs can detect the smallest deviation from the traditional method of pseudo-range of 2.30m reducing to 0.75m. Finally, the thesis research and engineering applications are summarized, and the next step will be to carry out the work were discussed. Thesis research results have been applied to China's own satellite navigation system, a system demonstration, the system core measurement equipment and the development of high-end receivers and other related projects.

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > Geodesy > Satellite geodesy and space geodesy > Global Positioning System (GPS)
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