GPS Signal Sequence Validation for Faster First Fix
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Solution Overview
Problem
In weak electric field environments, GPS satellite signals are often demodulated incorrectly, leading to difficulties in specifying sequence information, which prolongs the time required to acquire navigation messages and increases Time to First Fix (TTFF).
Innovation Solution
A method and device for receiving positioning signals that include sequence information and error detection information, where error detection is performed on received unit data to determine correct sequence information, allowing for rapid specification even in error-prone conditions, using a parity check and sequence condition determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If GPS satellite signals are received in weak electric field environments, then the receiving device can operate in challenging conditions, but incorrect demodulation occurs and sequence information cannot be specified
Solution Approach 1:
The patent performs preliminary error detection on the current subframe before attempting to specify sequence information. By checking error detection information in advance, the system可以避免 using incorrectly demodulated data, thus maintaining reliability in weak signal environments where demodulation errors are more likely to occur.
Solution Approach 2:
The patent implements a feedback mechanism where error detection results from previously received subframes are used to validate sequence information. When an error is detected in the current subframe, the system refers back to error detection information from adjacent subframes to determine whether sequence information should be specified, creating a closed-loop verification process that improves reliability.
2Reliability
If GPS satellite signals are repeatedly received to specify sequence information, then demodulation accuracy can be improved, but the time required to acquire navigation messages increases
Solution Approach 1:
The patent performs preliminary error detection on received subframes before attempting to specify sequence information. By checking error detection information in advance, the system可以避免 using incorrectly demodulated data, thus maintaining reliability in weak signal environments where demodulation errors are more likely to occur.
Solution Approach 2:
The patent implements a feedback mechanism where error detection results from previously received subframes are used to validate sequence information. When an error is detected in the current subframe, the system refers back to error detection information from adjacent subframes to determine whether sequence information should be specified, creating a closed-loop verification process that improves reliability.
3Measurement precision
If error detection is performed on received unit data, then sequence information specification accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent extracts and uses only the error detection information bits that are already embedded in the GPS navigation message structure. By taking out and utilizing this existing error detection data rather than implementing a completely new verification system, the patent improves sequence information determination accuracy while minimizing the increase in processing complexity.
Data Source
AI summary
A positioning signal receiving method includes receiving a positioning signal by which unit data that includes sequence information of navigation message data and one or more error detection information is sequentially transmitted, performing a first determination that determines whether or not an error occurs in first received unit data, based on the error detection information that is included in the first received unit data performing a second determination that determines whether or not an error occurs in second received unit data, based on the error detection information that is included in the second received unit data, if it is determined that an error occurs according to the first determination, and determining that the sequence information of the second received unit data or the sequence information of the first received unit data is correct, if it is determined that an error does not occur according to the second determination.