Satellite Transceiver Intersatellite Ranging Analysis
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Solution Overview
Problem
Current radio navigation satellite systems face challenges in accurately determining satellite orbits and detecting operational signal anomalies due to terrestrial control station limitations, which affect navigation performance and increase complexity and costs.
Innovation Solution
Incorporating a processor module in positioning satellites to periodically interrupt and analyze operational signals, allowing for detection of signal distortions and pseudodistance determination, converting each satellite into an autonomous navigator that can transmit analysis results and receive complementary data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terrestrial control stations are used to determine satellite orbits and synchronize clocks, then navigation systems can operate with existing infrastructure, but the accuracy of satellite positioning and detection of signal anomalies is limited
Solution Approach 1:
The patent applies the self-service principle by enabling satellites to determine their own positions and synchronize their own clocks using intersatellite ranging measurements. Each satellite equipped with a transceiver can measure distances to other satellites and process these measurements to autonomously compute orbit parameters and clock corrections, eliminating dependence on terrestrial control stations for these functions.
Solution Approach 2:
The patent inverts the traditional navigation architecture by having satellites perform the functions previously done by ground stations. Instead of ground stations measuring satellite positions and transmitting this data to receivers, the satellites themselves measure intersatellite distances and broadcast this information, fundamentally reversing the measurement and data flow direction.
2Reliability
If dedicated intersatellite ranging transceivers are installed on satellites, then navigation performance can be improved through autonomous orbit determination, but satellite fabrication costs and device complexity increase
Solution Approach 1:
The patent applies multi-functionality by designing a single transceiver unit that performs both intersatellite ranging for navigation and operational signal transmission for receiver positioning. This integrated approach eliminates the need for separate dedicated ranging transceivers, reducing satellite hardware complexity and fabrication costs while maintaining autonomous navigation capabilities.
Solution Approach 2:
The patent merges the intersatellite ranging function with the operational signal transmission function into a unified transceiver system. The same transceiver hardware and processing capabilities are used for both measuring distances to other satellites and for broadcasting navigation signals to ground receivers, consolidating functions that would otherwise require separate systems.
3Measurement precision
If dedicated signals are used for intersatellite ranging, then accurate pseudodistance measurement between satellites is achieved, but time synchronization and calibration requirements increase system complexity
Solution Approach 1:
The patent implements feedback mechanisms where satellites continuously exchange intersatellite ranging measurements and use this information to iteratively refine their orbit determinations and clock synchronizations. The processed ranging data is fed back into the navigation solution, allowing continuous improvement of position and time parameters without requiring complex external synchronization systems.
Solution Approach 2:
The patent performs preliminary time synchronization and calibration using the intersatellite ranging measurements before the actual navigation operations begin. By establishing accurate time references and orbital models through preliminary ranging data processing, the system eliminates the need for complex ongoing synchronization procedures during normal navigation operations.
4Reliability
If terrestrial stations process all navigation data, then existing infrastructure is utilized, but operational signal transmission anomalies cannot be detected
Solution Approach 1:
The patent enables satellites to self-monitor their own signal transmission quality by equipping them with receivers that can capture operational signals from other satellites. Each satellite processes these received signals to detect waveform distortions and transmission anomalies, providing autonomous anomaly detection without requiring terrestrial station intervention.
Solution Approach 2:
The patent performs preliminary anomaly detection during the signal transmission phase by having satellites continuously monitor incoming operational signals for waveform distortions. This preliminary detection occurs before the signals reach ground stations or user receivers, allowing early identification and reporting of transmission anomalies to prevent navigation errors.
Data Source
AI summary
A positioning satellite for a constellation of satellites of a radio navigation satellite system includes transmitter adapted to transmit operational signals intended to enable the determination of positions of radio navigation receivers, receiver adapted to receive at least some of the operational signals transmitted by positioning satellites of the constellation that are in view and processor adapted to interrupt transmission of the operational signals by the transmitter at selected times for a selected duration and to analyze during each transmission interruption at least some of the operational signals received by the receiver during at least a portion of the selected duration, for example to verify the waveform thereof and/or to determine pseudodistances.