Multi-Channel Coherent Combination for Faster GNSS Acquisition
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Solution Overview
Problem
GNSS receivers face significant computational challenges during satellite acquisition due to the need to identify satellites under unknown synchronization conditions, requiring numerous computations to find correlation peaks across multiple channels.
Innovation Solution
A multi-hypothesis combination circuit that coherently combines correlation outputs from multiple channels using sign sequences to generate a combination output, improving sensitivity through coherent combination and selection of the maximum hypothesis metric value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the GNSS receiver performs correlation operations on multiple channels to identify satellites under unknown synchronization conditions, then the acquisition sensitivity is improved, but the computational load increases significantly
Solution Approach 1:
The patent combines correlation outputs from multiple channels (data channel and pilot channel) through coherent integration to improve acquisition sensitivity. By merging the correlation results with appropriate sign sequences, the system achieves better signal detection performance without requiring separate processing of each channel independently, thus reducing overall computational complexity.
Solution Approach 2:
The patent performs preliminary correlation operations on individual channels before combining them. The correlation outputs from the data channel and pilot channel are computed separately with known sign sequences, and then combined in the hypothesis testing stage. This preliminary action allows the system to prepare correlation results in advance, reducing the computational burden during the final acquisition decision process.
2Measurement precision
If the GNSS receiver processes multiple correlation outputs from different channels, then the signal detection performance is improved, but the acquisition time increases
Solution Approach 1:
The patent maintains continuous processing of correlation outputs from multiple channels through coherent integration. By continuously combining the correlation results with appropriate sign sequences and performing hypothesis testing, the system achieves improved signal detection without requiring repeated separate acquisition processes, thus reducing total acquisition time.
Solution Approach 2:
The system performs preliminary correlation and combination operations on multiple channels before the final acquisition decision. The correlation outputs are prepared in advance with known sign sequences, and the coherent integration is performed before hypothesis testing, allowing for faster acquisition decisions without sacrificing detection performance.
Data Source
AI summary
A multi-hypothesis combination circuit includes a coherent combination circuit and a selection circuit. The coherent combination circuit generates a plurality of coherent combination outputs by performing coherent combination according to a plurality of correlation outputs and a plurality of sign sequences, wherein the plurality of correlation outputs correspond to a plurality of channels, respectively, and each of the plurality of coherent combination outputs is derived from the plurality of correlation outputs and one of the plurality of sign sequences. The selection circuit generates and outputs a combination output of the multi-hypothesis combination circuit according to the plurality of coherent combination outputs.