Satellite Network Positioning via Time Synchronization and Downlink Delay
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Solution Overview
Problem
Satellite positioning technologies are not compatible with communication systems, leading to inefficient use of satellite resources and high technical costs due to separate navigation and communication satellites, which are not suitable for data communication services.
Innovation Solution
A method and device for time synchronization with a satellite network to determine transmission delay and position information by calibrating local clocks and frequencies using time reference information, ephemeris data, and downlink positioning signals, allowing for integrated communication and positioning functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate navigation and positioning satellites are used, then positioning service can be provided, but satellite resources are wasted and technical cost increases
Solution Approach 1:
The patent combines navigation and communication satellite functions into a single integrated system. The communication satellite performs both communication relay and positioning functions by transmitting timing signals to terminals, which calculate transmission delays to determine position. This merging eliminates the need for separate navigation satellites, reducing satellite resources while maintaining positioning service availability.
Solution Approach 2:
The communication satellite is designed to perform multiple functions simultaneously: it provides communication services by relaying data between terminals and ground stations, and provides positioning services by transmitting downlink positioning signals with timing information. This multi-functionality allows a single satellite to replace what would traditionally require separate dedicated navigation and communication satellites.
2Reliability
If separate navigation and positioning satellite systems are used, then positioning function is achieved, but data transmission efficiency for ordinary communication services decreases
Solution Approach 1:
The patent merges navigation and communication satellite systems into a unified infrastructure. The same satellite, ground stations, and signal transmission channels are used for both communication and positioning purposes. This eliminates the need for separate dedicated navigation satellite systems, thereby improving data transmission efficiency by utilizing existing communication bandwidth and infrastructure for dual purposes.
3Adaptability or versatility
If terrestrial mobile communication positioning technology is applied to satellite systems, then compatibility with terrestrial system is achieved, but positioning accuracy deteriorates due to satellite movement and observation difficulties
Solution Approach 1:
The patent changes the fundamental parameters of the positioning approach by utilizing the known, predictable orbital parameters of communication satellites. Instead of treating satellites as moving base stations with unknown positions, the system uses precise orbital element data to calculate satellite positions at any given time. This parameter transformation allows terrestrial positioning algorithms to work effectively with satellite systems by accounting for satellite motion through mathematical modeling rather than direct observation.
Data Source
AI summary
The present disclosure discloses a positioning method, device, apparatus and a readable storage medium. The method includes: performing time synchronization with a satellite network; determining position information of a satellite; receiving a downlink positioning signal sent by a network device of the satellite network; determining a transmission delay between the satellite and the terminal according to a time synchronization result and the downlink positioning signal; determining position information of the terminal according to the transmission delay and the position information of the satellite.