Satellite Terminal Position Verification Using Timing Differences

The patent introduces timing advance (TA) values as an intermediary parameter that indirectly reflects terminal position. Instead of directly reporting position information which can be tampered with, the terminal reports TA values derived from uplink timing differences, and the network side uses these TA values to infer position information through a positioning model, thereby ensuring reliability while maintaining positioning function

The patent implements a feedback mechanism where the network side sends downlink timing information to the terminal, the terminal measures uplink timing differences and calculates TA values, then reports these TA values back to the network side. The network side uses this feedback to verify position information and adjust positioning calculations, creating a closed-loop system that enhances both accuracy and reliability

The patent makes communication satellites perform multiple functions - both communication and positioning. By using the same satellite infrastructure for both purposes, the system avoids the need for dedicated positioning satellites, reducing overall system complexity while maintaining positioning functionality through the use of timing advance values derived from communication signals

The terminal device itself participates in generating positioning data by measuring timing differences and calculating TA values from its own uplink transmissions. This self-service approach eliminates the need for separate positioning infrastructure, as the terminal uses its communication signals to generate the timing information needed for positioning