Radioelectric Device Localization Using Satellite Constellation Failure Mode Selection
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Solution Overview
Problem
Current localization systems using multiple satellite constellations face high processing complexity and imprecision due to the need to monitor various failure modes, which increases the processing load and can result in inaccurate device localization.
Innovation Solution
A method and system that selectively monitor failure modes based on probability thresholds, allowing radioelectric devices to determine navigation solutions and calculate protection levels by excluding certain failure modes, thereby reducing the number of monitored failures and processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a radioelectric device simultaneously receives navigation signals from multiple satellite constellations and monitors all failure modes, then the localization precision and integrity are improved, but the processing complexity and computational load increase significantly
Solution Approach 1:
The patent extracts and excludes certain failure modes from monitoring based on their probability of occurrence. Specifically, multiple failures of the first satellite constellation are excluded from monitoring when their probability is below a threshold, thereby reducing the number of failure modes that need to be monitored while maintaining adequate localization integrity
Solution Approach 2:
The patent changes the parameter of failure mode monitoring by dynamically selecting which failure modes to monitor based on probability thresholds. The system monitors single failures of both constellations and multiple failures of the second constellation, but excludes multiple failures of the first constellation when their probability is sufficiently low, thereby optimizing the balance between monitoring coverage and processing complexity
2Reliability
If a radioelectric device monitors all failure modes of multiple satellite constellations, then the integrity of localization is improved, but the processing load increases with the number of satellite constellations and satellites
Solution Approach 1:
The patent extracts and removes certain failure mode combinations from the monitoring set based on probability analysis. By excluding multiple failures of the first constellation (which have low probability) from the monitoring list, the system reduces the computational burden while maintaining adequate integrity through monitoring of more critical failure modes
Solution Approach 2:
The patent applies partial monitoring action by not monitoring all possible failure modes equally. Instead, it selectively monitors failure modes based on their probability and impact, monitoring single failures of both constellations and multiple failures of the second constellation, while excluding less critical multiple failures of the first constellation
Data Source
AI summary
A localization method, implemented in a satellite system includes at least a first constellation associated with a probability of occurrence of multiple failures lower than a given integrity risk, where the method may advantageously comprise the following steps implemented by a radioelectric device: receive a plurality of navigation signals; select failure modes to be monitored other than the multiple failures of the first constellation; determine a navigation solution and a plurality of navigation sub-solutions; calculate, for each navigation sub-solution, one or more corresponding detection thresholds; calculate one or more protection levels.