A mixed double-difference ambiguity fixation method between bds and gps systems
A fixed ambiguity, GPS system technology, applied in the field of satellite positioning system and positioning measurement, can solve the problem that it is difficult to calculate the single-difference ambiguity of reference satellites
Active Publication Date: 2018-03-30
LIAONING TECHNICAL UNIVERSITY
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However, this method requires the single-difference ambiguity of the reference satellite to meet a certain accuracy requirement (if GPS satellites are selected as the reference satellite, for B1 / L1 and B2 / L2, the calculation accuracy of the single-difference ambiguity of the reference satellite should be lower than 11 weeks and 6 weeks), for the short baseline, the reference satellite single-difference ambiguity that can meet the accuracy requirements can be calculated according to the multi-epoch P code and carrier phase data; but for the medium-long baseline or long baseline, it is difficult to use effective The method to calculate the reference satellite single-difference ambiguity that meets the accuracy requirements
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[0050] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0051] A hybrid double-difference ambiguity fixation method between BDS and GPS systems, the process of which is as follows figure 1 shown, including the following steps:
[0052] Step 1: Obtain the BDS / GPS receiver observation data of the reference station and the mobile station, including BDS pseudorange and carrier observation data, GPS pseudorange and carrier observation data, and read them epoch by epoch;
[0053] Step 2: Estimate the ISB correction parameter value; calculate the approximate coordinates of the base station and the rover, select the common-view satellites of the base station and the rover, and then construct the non-difference observation equation of the base station and the rover, for position, troposphere, ionosphere, The ISB and ambiguity parameters are initialized or updated, and the double-difference o...
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The invention provides a hybrid double-difference ambiguity fixing method between BDS and GPS systems, which belongs to the technical field of satellite positioning systems and positioning measurement. By solving the double-difference ambiguity in the form of the difference of the single-difference ambiguity, and then projecting the single-difference ambiguity in weeks as a double-difference ambiguity, the influence of different wavelengths of BDS and GPS is eliminated. Using the ISB parameter estimation method, the stability of the ISB can be analyzed in real time. After reaching the stable condition, the ISB is used as the correction parameter to correct the original observation data, so that any double-difference ambiguity between the BDS and GPS systems has integer characteristics. , to achieve hybrid double-difference ambiguity fixation between BDS and GPS systems. This method can eliminate the limitation of the single-difference ambiguity accuracy of the reference satellite on the length of the calculated baseline, and avoid the unavailability of the existing ISB correction parameters due to changes in the observation conditions, which is suitable for engineering practice.
Description
technical field [0001] The invention belongs to the technical field of satellite positioning systems and positioning measurement, and in particular relates to a method for fixing mixed double-difference ambiguities between BDS and GPS systems. Background technique [0002] The combination of Beidou Navigation satellite system (BDS) and GPS system can improve the accuracy, reliability and usability of positioning. Due to the increase in the number of observable satellites, the combination of BDS and GPS signals can effectively shorten the initialization time and extend the baseline solution length. [0003] In the process of BDS / GPS combined relative positioning, the established mathematical model usually needs to select one reference satellite in each system, and the ambiguity is fixed in each system respectively. This solution method can be called standard double difference. This method is currently widely used. On the other hand, if BDS and GPS only select one reference ...
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IPC IPC(8): G01S19/44G01S19/42
CPCG01S19/423G01S19/44
Inventor 隋心徐爱功郝雨时车丽娜杨东辉刘韬王长强郭哲
Owner LIAONING TECHNICAL UNIVERSITY