Satellite Signal Path Time Delay Calibration
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Solution Overview
Problem
Satellite navigation systems face errors due to time delay variations between signal paths, which affect the accuracy of position and time measurements, especially in systems not designed for navigation where time delays can change quickly and unpredictably.
Innovation Solution
A method and system for correcting time delay variations by measuring and calibrating the time delays for each signal path, applying a calibrated value to correct signals, and ensuring consistent time delays across all paths, either within the satellite or at the receiver, to minimize navigation and timing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple selectable signal paths are used in a satellite, then signal transmission flexibility is improved, but time delay variation between paths increases
Solution Approach 1:
The patent applies preliminary action by measuring and determining calibrated time delay values for each signal path before normal operation. The system pre-characterizes each path's time delay properties and stores calibration data, enabling the receiver to compensate for path-specific delays when signals are received, thus maintaining time delay consistency across multiple selectable paths.
Solution Approach 2:
The patent applies parameter changes by using calibrated time delay values as correction parameters. The receiver identifies which signal path was used and applies the corresponding calibrated time delay parameter to correct the received signal, transforming the variable time delay characteristic into a compensated, consistent timing reference for navigation calculations.
2Reliability
If signal path switching is implemented, then system reliability is improved, but carrier phase discontinuities increase
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing calibrated time delay values for each signal path before switching occurs. When path switching happens, the receiver uses the pre-determined calibration data to compensate for the transition, preventing carrier phase discontinuities that would otherwise occur during path switching and maintaining signal reliability.
3Measurement precision
If time delay calibration is performed for each signal path, then navigation accuracy is improved, but system complexity increases
Solution Approach 1:
The patent applies self-service by having the satellite system automatically perform time delay measurements and generate calibration data for each signal path during manufacturing or initial operation. The calibration information is stored within the system and automatically applied during normal operation, eliminating the need for manual calibration procedures and reducing operational complexity while maintaining high navigation accuracy.
Data Source
AI summary
A method for correcting for time delay variations between a plurality of signal paths from a signal source to at least one transmit antenna of a satellite may include measuring a time delay for each of the plurality of signal paths. The method may also include correcting a signal for the time delay variation based on the time delay for the signal path that is currently being used by the satellite, the corrected signal being usable for at least one of navigation, determining a geographic location and determining time.