Satellite Terminal Location Verification Using Subframe Time Difference
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Solution Overview
Problem
Existing satellite communication systems face challenges in accurately positioning ground terminal devices due to tampered or erroneous location information reported by terminal devices, which complicates compliance with laws and regulations across different countries and regions.
Innovation Solution
A communication method involving time difference measurements between downlink and uplink subframes is employed to verify the location of terminal devices, utilizing a communication apparatus to send information about the time differences to a positioning server for accurate location management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terminal device reports location information to network side, then positioning function is provided, but location information may be tampered with or contain large errors
Solution Approach 1:
The patent introduces a positioning server as an intermediary that independently calculates terminal location using satellite signal measurements. Instead of directly trusting terminal-reported location information, the network side uses the positioning server to verify location through time difference measurements of satellite signals received at the terminal, thereby resolving the contradiction between providing positioning function and ensuring location information reliability
Solution Approach 2:
The patent implements a feedback mechanism where the positioning server receives measurement results from the terminal device, independently calculates location information, and uses this to verify the authenticity of terminal-reported location data. This feedback loop enables the network side to detect and correct tampered or erroneous location information
2Ease of operation
If dedicated positioning satellite is used for terminal positioning, then positioning function is achieved, but location verification by network side cannot be implemented
Solution Approach 1:
The patent enables communication satellites to perform dual functions: both providing communication services and supporting positioning/verification functions. By allowing communication satellites to be used for network-side location verification in addition to their primary communication role, the system avoids the need for separate dedicated positioning satellites while maintaining positioning functionality and enabling network verification
3Productivity
If terminal device sends location information to network side, then positioning is provided, but compliance with laws and regulations of different countries cannot be ensured
Solution Approach 1:
The patent implements verification feedback where the positioning server independently calculates terminal location using satellite signal measurements and compares this with terminal-reported location information. This feedback mechanism ensures that location data used for regulatory compliance purposes is authentic and un tampered, enabling reliable compliance checking across different countries and regions
Data Source
AI summary
A method includes: receiving a first downlink frame from a second communication apparatus; sending a first uplink frame to the second communication apparatus; and sending first information to a positioning server, where the first information indicates a first time difference between receiving time for receiving an ith first downlink subframe in the first downlink frame and sending time for sending a kth first uplink subframe in the first uplink frame. The first information is sent to the positioning server, so that location management can verify a location of a first communication apparatus based on the time difference between the receiving time at which the first communication apparatus receives the ith first downlink subframe and the sending time at which the first communication apparatus sends the kth first uplink subframe.