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Improvement of GPS ambiguity resolution using prior height information. Part Ⅱ: The method of using quasi observation

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Journal of Central South University of Technology 2002年第3期9卷 260-266页

作者：朱建军 rock santerre School of Info Physics and Geomatics Engineering Central South University Centre for Research in Geomatics Laval University Canada

This paper deals with the method of using quasi observation. In the paper a simple algorithm is developed for the adjustment computation with quasi observation at first. And then the ability of quasi observation to improve ambiguity search technique is studied in detail. The robustness of the method is also discussed. A method to determine the weight of quasi observation is proposed. The results show that a prior height can be taken as a quasi observation and used together with GPS observations. It can strengthen residual tests, especially in situation where there are fewer satellites in the sky. It also can change structure of incorrect solutions, which will theoretically make less incorrect solutions left in search space. At last the field tests are carried out to show that the proposed method is effective. The success rate of ambiguity resolution in the four field tests is improved significantly.

关键词： ambiquity resolution algorithm with quasi observation robustness

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Acquisition of Weak Signals in Multi-Constellation Frequency Domain Receivers

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Positioning 2013年第2期4卷 144-152页

作者： Kaveh Mollaiyan rock santerre René Jr. Landry Department of Electrical Engineering école de Technologie Supérieure Montreal Canada Department of Geomatics Sciences Université Laval Quebec Canada Department of Electrical Engineering école de Technologie Supérieure Montreal Canada

New positioning applications’ availability requirements demand receivers with higher sensitivities and ability to process multiple GNSS signals. Possible applications include acquiring one signal per GNSS constellation in the same frequency band and combining them for increased sensitivity or predicting acquisition of other signals. Frequency domain processing can be used for this purpose, since it benefits from parallel processing capabilities of Fast Fourier Transform (FFT), which can be efficiently implemented in software receivers. On the other hand, long coherent integration times are mainly limited due to large FFT size in receivers using frequency domain techniques. A new method is proposed to address the problems in frequency domain receivers without compromising the resources and execution time. A pre-correlation accumulation (PCA) is proposed to partition the received samples into one-code-period blocks, and to sum them together. As a result, the noise is averaged out and the correlation results will gain more power, provided that the relative phase between the data segments is compensated for. In addition to simplicity, the proposed PCA method enables the use of one-size FFT for all integration times. A post-correlation peak combination is also proposed to remove the need for double buffering. The proposed methods are implemented in a configurable Simulink model, developed for acquiring recorded GNSS signals. For weak signal scenarios, a Spirent GPS simulator is used as a source. Acquisition results for GPS L1 C/A and GLONASS L1OF are shown and the performance of the proposed technique is discussed. The proposed techniques target GNSS receivers using frequency domain processing aiming at accommodating all the GNSS signals, while minimizing resource usage. They also apply to weak signal acquisition in frequency domain to answer the availability demand of today’s GNSS positioning applications.

关键词： FFT Acquisition Frequency Domain Receiver Weak Signal Multi-Constellation

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Single Point Positioning Using GPS, GLONASS and BeiDou Satellites

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Positioning 2014年第4期5卷 107-114页

作者： rock santerre Lin Pan Changsheng Cai Jianjun Zhu Department of Geomatic Sciences Laval University Quebec City Canada School of Geosciences and Info-Physics Central South University Changsha China

This paper introduces the Chinese BeiDou satellite system and its comparison with the actual completed American GPS and the Russian GLONASS systems. The actual BeiDou system consists of 14 satellites covering totally the Asia-Pacific area. A Single Point Positioning (SPP) test has been realised in Changsha, Hunan province, China, to show the advantage of using combined pseudorange solutions from these 3 satellite navigation systems especially in obstructed sites. The test shows that, with an elevation mask angle of 10°, the accuracy is improved by about 20% in horizontal coordinates and nearly 50% in the vertical component using the simultaneous observations of the 3 systems compared to the GPS/GLONASS solution. For the processing with an elevation mask angle of 30°, most of the time less than 4 GPS satellites were available for the GPS-only case and no solution was possible. However, in this difficult situation, the combined GPS/GLONASS/ BeiDou solutions provided an accuracy (rms values) of about 5 m.

关键词： BeiDou GPS GLONASS Single Point Positioning

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