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CN-116707614-B - Beidou short message communication method applied to GNSS satellite common view

CN116707614BCN 116707614 BCN116707614 BCN 116707614BCN-116707614-B

Abstract

The invention discloses a Beidou short message communication method applied to GNSS satellite common view, which is characterized in that when data fitting acquisition of N-th group satellite common view data is finished, core data of the N-th group satellite common view data is extracted to be compressed, beidou short message communication is completed before data fitting acquisition of N+1-th group satellite common view data, transmission of the compressed core data of the N-th group satellite common view data is completed, N is a positive integer, and transmission of the compressed core data of the N-th group satellite common view data is completed 2-3 times before data fitting acquisition of the N+1-th group satellite common view data.

Inventors

  • ZHANG YUE
  • WANG YUZHUO
  • ZHANG SIDE

Assignees

  • 中国计量科学研究院

Dates

Publication Date
20260505
Application Date
20230615

Claims (10)

  1. 1. The Beidou short message communication method applied to GNSS satellite common view is characterized in that when data fitting acquisition of the N-th group of satellite common view data is finished, core data of the N-th group of satellite common view data are extracted for compression, beidou short message communication is completed before data fitting acquisition of the N+1-th group of satellite common view data, transmission of the compressed core data of the N-th group of satellite common view data is completed, and N is a positive integer.
  2. 2. The method for Beidou short message communication applied to GNSS satellite common view according to claim 1, wherein the transmission of core data of the N+1th group of compressed satellite common view data is completed 2 to 3 times before data fitting acquisition of the N+1th group of satellite common view data.
  3. 3. The method of claim 2, wherein the extracting and compressing of the core data of the nth group of satellite common view data is followed by delaying for X 1 minutes, the first transmitting of the core data of the compressed nth group of satellite common view data is followed by delaying for X 2 minutes again after the first transmitting is completed, the second transmitting of the core data of the compressed nth group of satellite common view data is followed by transmitting for X 1 +X 2 for less than or equal to 2 minutes, and X 1 is not zero, and X 2 is not less than 1 minute.
  4. 4. The method of claim 2, wherein the extracting and compressing of the core data of the nth set of satellite common view data is followed by delaying for Y 1 minutes, the first transmitting of the core data of the compressed nth set of satellite common view data is followed by delaying for Y 2 minutes after the first transmitting is completed, the second transmitting of the core data of the compressed nth set of satellite common view data is followed by delaying for Y 3 minutes, the third transmitting of the core data of the compressed nth set of satellite common view data is followed by transmitting for Y 1 +Y 2 +Y 3 for less than or equal to 2 minutes for 10 seconds, and Y 1 is not zero, and both Y 2 and Y 3 are not less than 1 minute.
  5. 5. The method of claim 4, wherein the extracting and compressing of the core data of the nth set of satellite common view data is followed by a delay of 10 seconds, the first transmission of the core data of the compressed nth set of satellite common view data is completed, the first transmission is followed by a delay of 1 minute again, the second transmission of the core data of the compressed nth set of satellite common view data is followed by a delay of 1 minute again, and the third transmission of the core data of the compressed nth set of satellite common view data is followed by a delay of 1 minute again.
  6. 6. The method for Beidou short message communication applied to GNSS satellite common view according to claim 1, wherein after extracting core data of the N group of satellite common view data and compressing, the size of a compressed data packet is within 76 bytes.
  7. 7. The method for communication of Beidou short messages applied to GNSS satellite common view according to any one of claims 1-6, wherein core data of the satellite common view data comprises satellite numbers, initial tracking time and local clock and satellite system time deviation of corrected satellite clock errors.
  8. 8. The method for Beidou short message communication applied to GNSS satellite common view according to claim 7, wherein the packed and compressed data comprises common view data of four satellite systems, namely GPS, GLONASS, beidou and Galileo.
  9. 9. The method for Beidou short message communication applied to GNSS satellite common view of claim 8, wherein packed compressed data further comprises clock difference data calculated by single-frequency pseudo-range or clock difference data calculated by double-frequency combined pseudo-range.
  10. 10. The method for Beidou short message communication applied to GNSS satellite common view according to claim 7, wherein satellites with higher satellite altitude angles are selected when the number of available satellites exceeds 18.

Description

Beidou short message communication method applied to GNSS satellite common view Technical Field The invention relates to the technical field of time-frequency transmission of satellite navigation, in particular to a Beidou short message communication method applied to GNSS satellite common view. Background The time is one of the most basic physical quantities internationally, and has very important significance in the fields of ordinary life, scientific research, aerospace, national economy, construction national defense and the like. The standard time frequency standard is the heart of various electronic devices, and the accurate and reliable operation of the various electronic devices is ensured. With the high development of informatization, intellectualization and internet of things, many fields are very important for the research of time frequency fields and the construction of related service capability in order to meet the planning and requirements of national technological development. In the last 20 years, the improvement of time frequency precision is an exponential development trend, and is improved by an order of magnitude approximately every 5-10 years. In the fields of power, communication, finance, public security, traffic, the internet and the like, accurate time frequency and time synchronization are particularly important. At present, the high-precision remote time frequency transmission technology mainly comprises GNSS satellite common-view time frequency transmission, satellite bidirectional time frequency transmission, optical fiber time frequency transmission and the like. The most mature and common technology in the application of the current technology is to use a GNSS navigation satellite common-view comparison method to carry out remote time frequency transmission. The real-time comparison and remote tracing of time and frequency can be realized by utilizing satellite common vision, a data transmission link is required to be established between two satellite common vision devices, and at present, a wired network or a 4G/5G wireless network is generally adopted for data transmission, so that the method is not applicable to the high-safety fields of national defense construction, electric power, communication and the like. The Beidou satellite navigation system is a global satellite navigation system which is self-developed in China, is also a third mature satellite navigation system after GPS and GLONASS, has the functions of navigation, positioning, time service and the like, and also has the function of short message transmission. As the beidou No. three system established in 2020 provides services for the world, the beidou satellite navigation system is widely applied in various fields. The invention applies the Beidou short message communication function to the data transmission of GNSS common view time frequency transmission, and provides a new method for the fields with higher security requirements such as national defense construction, electric power, communication and the like. But the transmitting frequency (L-band uplink frequency) of the Beidou short message communication is relatively close to the GNSS receiving frequency (L-band, 1.2 GHz-1.6 GHz), and the receiving of GNSS satellites can be influenced when the antenna distance of the transmitting frequency and the GNSS receiving frequency is relatively close, so that GNSS satellite common view data (CGGTTS standard format) is discontinuous and has relatively large jitter. Moreover, the GNSS common view data (CGGTTS standard format) has large data volume and cannot be transmitted efficiently in time. Therefore, signal interference exists through Beidou short message communication, so that the problems of low communication success rate and poor common view precision are caused, and GNSS satellite common view data cannot be timely and efficiently transmitted. Disclosure of Invention The invention aims to provide a Beidou short message communication method applied to GNSS satellite common view, which aims to solve the problems of low communication success rate and poor common view precision caused by signal interference and incapability of efficiently transmitting GNSS satellite common view data in time in the existing Beidou short message transmission satellite common view data. In order to achieve the above objective, the present invention provides a Beidou short message communication method applied to GNSS satellite common view, when data fitting acquisition of the nth group of satellite common view data is finished, core data of the nth group of satellite common view data is extracted and compressed, and Beidou short message communication is completed before data fitting acquisition of the (n+1) th group of satellite common view data, transmission of the compressed core data of the nth group of satellite common view data is completed, and N is a positive integer. Further, before the data fitting acquisition of the (n+1)