Low-orbit navigation enhancement precision correction data generation and uploading system and method

Abstract

The invention relates to a low-orbit navigation enhancement precision correction data generation and uploading system and method. A ground data processing central station combines monitoring data acquired by a GNSS (Global Navigation Satellite System) monitoring station and low-orbit satellite monitoring data acquired by a satellite measurement and control station for processing to generate SSR (State Space Representation) data; the generated SSR data is evaluated and then transmitted to three service data uploading stations, the three service data uploading stations respectively transmit theSSR data to three geostationary orbit communication satellites as high elliptical orbit satellites through an uploading channel, a low-orbit navigation enhancement satellite receives the SSR data broadcasted by the geostationary orbit communication satellites, and processes the uploaded SSR data by adopting a navigation enhancement load t generate enhanced navigation signals so as to complete high-precision orbit determination and low-orbit navigation enhancement information generation. Compared to the prior art, the method for generating and uploading the SSR correction data of the navigationsystem required by the low-orbit navigation enhancement system is achieved without depending on low-orbit inter-satellite links, so that the complexity of the low-orbit system is reduced, the reliability of the low-orbit constellation system is improved, and the service life of the low-orbit constellation system is prolonged.

Description

technical field [0001] The invention relates to the technical field of navigation enhancement, in particular to a system and method for generating and adding precision correction data for low-orbit navigation enhancement. Background technique [0002] Global Navigation Satellite System (GNSS), especially the GPS system in the United States, the GLONASS system in Russia, the Galileo system in Europe and the Beidou system in China, have been widely used around the world to provide navigation and positioning services for users in various fields. However, with the promotion of applications, the current high-precision surveying and mapping, precision agriculture, transportation and logistics, aviation management and other fields have higher and higher requirements for navigation and positioning accuracy, availability, and integrity. The traditional GNSS system can no longer meet the needs. [0003] In the current navigation field, the IGS organization uses the observation data of...

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Problems solved by technology

[0004] The navigation receiver can improve the accuracy of navigation and positioning by receiving GNSS precision orbit and precision clock difference products, and the highest single-point positioning accuracy can reach centimeter level, but the navigation receiver cannot obtain precise data through the Internet in many application scenarios, such as low orbit For the on-board GNSS receivers of all satellites in the navigation augmentation satellite system, to achieve centimeter-level positioning, the GNSS precision orbit products and precision clock products on the ground must be obtained through other communication links. The general system uses low-orbit inter-satellite links In this way, it is injected into one of the satellites through the ground station, and then transmitted to each satellite of the constellation system through the inter-orbit inter-satellite link and the inter-orbit inter-satellite link

[0005] At present, the maturity of inter-satellite communication terminals suitable for micro-nano satellites is low. In addition, the addition of inter-satellite links has increased the requirements for power supply and carrying capacity of low-orbit micro-nano satellite platforms. Existing technologies and research have also proposed inter-satellite data The demand for efficient transmission routing, etc., greatly increases the complexity of the low-orbit constellation system, increases the cost of system construction, and reduces the reliability of the system

In addition, the generation of real-time precise data of the current GPS system is based on more than 400 tracking and monitoring stations around the world, but the number of ground tracking and monitoring stations of the Beidou system is small and cannot be distributed globally

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