Geolocation Receiver Synchronization Validation Using Ephemeris Word Extraction
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Solution Overview
Problem
Current methods for validating synchronization between a geolocation receiver and a transmitting satellite during the acquisition phase are inefficient, often requiring a complete decoding of ephemeris data sets and comparison with almanac data, which takes a long time, especially in systems like GPS and SBAS, leading to potential false synchronization and distorted positioning.
Innovation Solution
A method that validates synchronization using only part of the ephemeris words received, reducing the time required to confirm the absence or presence of false synchronization by implementing a probability-based validation process that compares extracted ephemeris words with stored values, allowing for rapid identification of cross-correlation errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete ephemeris data sets are decoded and compared with almanac data to validate synchronization, then the reliability of synchronization validation is improved, but the time required for validation increases significantly
Solution Approach 1:
The patent extracts only the necessary ephemeris words (specifically words 0, 4, 8, 12, 16) from the complete ephemeris data set for validation purposes. This extraction principle allows the system to validate synchronization without processing all ephemeris data, thereby reducing validation time while maintaining reliability through targeted comparison of critical satellite position information.
Solution Approach 2:
The patent segments the ephemeris validation process into discrete, independently processable ephemeris words. By dividing the complete ephemeris data set into individual words and selectively validating only specific ones, the system achieves faster validation without compromising the overall reliability of synchronization confirmation.
2Measurement precision
If traditional synchronization validation methods are used, then the accuracy of positioning information is ensured, but the productivity of the geolocation system decreases due to long validation times
Solution Approach 1:
The patent applies preliminary action by pre-identifying which ephemeris words are critical for synchronization validation (words 0, 4, 8, 12, 16). This preliminary selection allows the system to focus validation efforts on only these essential words, maintaining positioning accuracy while significantly improving system response speed by avoiding processing of non-critical data.
Solution Approach 2:
The patent implements partial action by validating only a subset of ephemeris words rather than the complete data set. This partial validation approach is sufficient to ensure positioning accuracy while dramatically reducing the computational burden and improving productivity.
3Reliability
If all ephemeris words are processed for synchronization validation, then the integrity of navigation information is improved, but the device complexity and processing requirements increase
Solution Approach 1:
The patent extracts only the essential ephemeris words needed for synchronization validation (words 0, 4, 8, 12, 16), eliminating the need to process the complete ephemeris data set. This extraction reduces processing complexity while maintaining navigation information integrity through focused validation of critical satellite position data.
Data Source
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AI summary
The invention relates to a method for validating synchronization between a geolocation receiver (12) with an identified transmitting satellite, the receiver (12) being capable of receiving a composite radio signal comprising a plurality of navigation signals each emitted by a transmitting satellite belonging to a constellation of satellites (4, 6, 8), as well as a method for validating synchronization between a geolocation receiver (12) with a transmitting satellite (10) during an acquisition phase of an augmentation signal comprising geolocation correction and integrity data.The method of the invention comprises, for each identified transmitting satellite (4, 6, 8, 10), the extraction of received ephemeris words or words of any type from the received signal associated with the identified satellite as it is received, and the comparison of at least one received word with at least one word of the same rank received or stored for said identified satellite and/or for at least one other satellite. The validation or failure of synchronization with said identified transmitting satellite depends on a predetermined probability of false alarm and/or probability of non-detection.