A multi-satellite non-Gaussian carrier Doppler anomaly detection and elimination method
An anomaly detection and carrier technology, which is applied in radio wave measurement systems, measurement devices, satellite radio beacon positioning systems, etc., can solve the problem of real-time application theory, which is of little significance and cannot solve the integrity monitoring problem of carrier Doppler hopping. , high computational complexity, to achieve the effect of improving medium and long-term stability, reducing clock speed jump, and low algorithm complexity
Active Publication Date: 2022-03-04
XIAN INSTITUE OF SPACE RADIO TECH
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This method has high computational complexity and is only suitable for post-processing, which has little significance for the theoretical guidance of real-time application in engineering practice.
In addition, this method is not applicable to the integrity monitoring problem of carrier Doppler, and cannot solve the integrity monitoring problem of carrier Doppler jump caused by satellite switching
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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0034] In the conventional receiver RAIM method, it is assumed that only one satellite has an integrity failure in the measurement at the same time. Under the assumption that the carrier Doppler obeys the Gaussian distribution, the user clock speed adopts the corresponding scalar test statistic of the chi-square distribution. If the When the test statistic exceeds the threshold, one satellite is removed from the observation satellite list each time, the user clock speed is recalculated, and finally the smallest user clock speed is selected as the optimal user clock speed. However, in the process of carrier Doppler integrity monitoring, it is found that the above processing strategies are not ideal, because there may be two satellites sw...
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A real-time multi-satellite non-Gaussian carrier Doppler anomaly detection and elimination (Fault Detection and Elimination, FDE) method, which belongs to the field of low-orbit GNSS navigation enhanced precision speed measurement technology, realizes non-Gaussian distribution downloading through the nearest neighbor low-orbit user clock speed constraint Wave Doppler high-integrity monitoring and fault elimination can realize the detection and elimination of abnormal carrier Doppler jumps caused by switching between multiple satellites, thereby overcoming the problem of abnormal jumps in user clock speed sequences caused by switching between multiple satellites. It improves the estimation accuracy and integrity of the user's clock speed when using GNSS to tame the low-orbit satellite clock, and has broad application prospects.
Description
technical field [0001] The invention relates to a multi-satellite non-Gaussian carrier Doppler anomaly detection and elimination method, and belongs to the technical field of low-orbit GNSS navigation enhanced precision speed measurement. Background technique [0002] With the development of low-orbit GNSS navigation augmented satellite systems, carrier Doppler-based clock taming technology has great advantages and potential in the establishment and maintenance of low-orbit satellite frequency references. The long-term and short-term stability performance of high-stable crystal oscillators after taming It can be compared to replace the space-borne atomic clock, and has important application value and market competitiveness. This technology mainly calculates the high-precision carrier Doppler (accuracy can reach the order of 1-3mm / s) through the high-precision carrier phase measurement value of the GNSS system, and then estimates the receiver's own Clock speed, and then adju...
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IPC IPC(8): G01S19/20G01S19/29G01S19/28
CPCG01S19/20G01S19/29G01S19/28
Inventor 雷文英边朗王国永严涛王瑛蒙艳松
Owner XIAN INSTITUE OF SPACE RADIO TECH