| Bei Dou Satellite Navigation System is the global satellite navigation system developed by China independently. Although the uptime of Beidou satellite navigation system is later than GPS and GLONASS, but it is the world’s first satellite navigation system which integrates positioning, timing and short-message communication into one. To give a technique support of the application on the multi-frequency data in high precision positioning, this paper makes a study on the processing and application of multi-frequency BDS data. This dissertation lays emphasis on the study of the theory of triple-frequency combination observations, cycle-slip detection and repair, and triple-frequency single-epoch ambiguity resolution. The main work of this paper are as follows:(1) In this paper, Compass observation model and observation error positioning and corresponding corrective measures are given. In addition multi-frequency methods for correcting ionospheric delay is given too.(2) This paper carrys out a systematic study on the theory of combination triple-frequency combination observations, and selects the combination coefficients which meet the characteristic of long-wavelength, low ionospheric delay and low observation noise according to the characteristics of the combination observations, and select the optimal combination observation linear coefficients. The results show that: It is proved that the sum of three integer coefficients of combination observations with long wavelength, low amplification factor for ionosphere and low noise should equal to zero.(3) The method that combining with Melbourne-wubbena(M-W) and total electron contents rate(TECR) is proposed to real-time detect and repair the cycle-slips of Bei Dou carrier phase un-differenced observation data. Firstly, taking the MW-TECR as the cycle-slip detectable amount to detect the cycle-slips accurately in the Bei Dou B1 and B2 carrier phase. Then using the search matching algorithm to repair cycle slip Finally, experiments are carried out to test the cycle-slip detection and repair on small cycle-slips, large cycle-slips, insensitive cycle-slips and successive cycle-slips based on the actual Bei Dou un-differenced observation data. The experimental result shows that, the MW-TECR combination can detect and repair any added cycle-slip combination of the original observation data effectively.(4) This paper presents real-time cycle-slip detection and repair for Bei Dou triple-frequency carrier phase data with code-phase combination and geometry-free phase combination. Firstly, we use the extra wide-lane code-phase combination with low ionosphere as the first and second cycle-slip detectable amount, geometry-free phase combination with low ionosphere as the third detectable amount, thus compose three linearly independent combinations. Then we search and match cycle-slip combinations of least squares solutions of cycle-slip valuations by taking minimum 1 norm as the cycle-slip repair principle. At last we use observation data of different sampling frequency and different satellites to conduct cycle-slip detection and repair experiment. The result shows that it is accurate and real-time to detect and repair cycle-slip combination of observation data in different sampling rates and satellites.(5) Based on CIR(Cascading Integer Resolution) method, two improving methods of solving narrow lane combination ambiguity are given: This paper using the ionosphere-free combination method to solve narrow lane combination ambiguity;This paper add a priori information of ionospheric delays, regard it and the location parameters and ambiguity as unknown parameters to be solved based on the traditional TCAR method and least squares collocation. Meanwhile, the ambiguity search space to be constricted by the ambiguity related method of considering ionospheric delays. The results showed that: add a prior information of ionospheric delays in unknown parameters can greatly improve the single-epoch ambiguity success rate. |
PDF Full Text Request