Satellite navigation system signal quality monitoring method
A satellite navigation system and signal quality technology, applied in the field of satellite navigation, can solve problems such as user loss, lack of signal power, ranging performance, user reception performance, and inability to achieve fast response of ranging codes, etc.
Pending Publication Date: 2021-01-12
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology
However, the existing signal quality monitoring is only a simple analysis based on the observation data of the receiver, and cannot realize rapid response to deep-seated problems such as ranging codes, signal power, and modulation characteristics.
[0003] However, the signal quality evaluation work has a certain lag, and it cannot provide users with early warnings in time for some emergencies, causing immeasurable losses to users.
In the existing global continuous monitoring and evaluation system (iGMAS), the monitoring contents such as space signal accuracy, satellite clock, and time deviation are mainly aimed at satellite navigation ephemeris parameters, and lack signal power, ranging performance, etc. that directly affect user receiving performance. Parameter monitoring
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[0052] In order to enable those skilled in the art to better understand that the technical solutions of the present invention can be implemented, the present invention will be further described below in conjunction with specific examples, but the given examples are only used as illustrations of the present invention, not as limitations of the present invention.
[0053] 1. Signal monitoring parameters and characterization methods
[0054] Formulate the characterization method of signal quality monitoring parameters of GNSS navigation signals, and determine the standard expression and definition of monitoring content and monitoring parameters.
[0055] (1) Waveform characteristics
[0056] a) Pseudo-code correctness: monitor the bit error rate within one code cycle;
[0057] b) Digital distortion: the time-domain waveform distortion degree of the monitoring signal;
[0058] (2) Power characteristics
[0059] a) Received power on the ground: monitor the change of signal recei...
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The invention relates to a satellite navigation system signal quality monitoring method. The method comprises the following steps: monitoring waveform characteristics, power characteristics, related characteristics, modulation characteristics, channel characteristics, consistency and Doppler changes; wherein waveform characteristic monitoring is realized through analysis of pseudo code correctnessand digital distortion, power characteristic monitoring is realized through analysis of ground receiving power, correlation characteristic monitoring is realized through analysis of correlation lossand S curve zero crossing point deviation, and modulation characteristic monitoring is realized through analysis of a signal modulation mode. The channel characteristic monitoring is realized by solving signals through a pseudo code analysis technology, and the consistency monitoring is realized by analyzing the phase consistency of codes and carriers and the phase deviation of signal component carriers; doppler change monitoring is achieved through a frequency spectrograph, the highest wave peak value is calibrated through the frequency spectrograph, frequency readings are automatically recorded, and modulation signal carrier frequency changes are monitored. The method has the advantages that the rapid response of the navigation signal deep-level problem and the alarm of the signal burstabnormality are realized.
Description
technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to a signal quality monitoring method of a satellite navigation system. Background technique [0002] The satellite navigation signal is the only core link in GNSS that simultaneously establishes a connection between the space segment, the ground segment, and the user segment. The quality of the navigation signal directly affects the service and user experience of the system. Therefore, in order to ensure that the satellite navigation system can provide reliable PNT services, the monitoring of the signal quality in space is essential. However, the existing signal quality monitoring is only a simple analysis based on receiver observation data, and cannot achieve rapid response to deep-seated problems such as ranging codes, signal power, and modulation characteristics. [0003] However, the signal quality evaluation work has a certain lag, and it cannot provi...
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IPC IPC(8): G01S19/20G01S19/23G01S19/43
CPCG01S19/20G01S19/23G01S19/43
Inventor 石慧慧卢晓春饶永南王雪
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI