Universal Digital Channel for Multi-GNSS Signal Processing
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Solution Overview
Problem
Current GNSS receivers face challenges in accurately processing signals from multiple satellite navigation systems like GPS, GLONASS, and Galileo due to interference, multipath errors, and cycle slips, which affect location determination accuracy.
Innovation Solution
A universal digital channel receiver is designed with a universal code generator and strobe generator to process signals from different navigation systems, using m-sequence and Gold codes, and generating binary offset carrier signals, which allows for efficient multipath suppression and noise management by adapting to the RF-part filters and strobe parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a receiver uses multiple frequency bands to receive satellite signals, then it can measure carrier phases on multiple frequencies for ionosphere delay corrections and ambiguity resolution, but it increases device complexity and requires more channels
Solution Approach 1:
The patent implements a universal digital channel structure that can process signals from multiple satellite navigation systems (GPS, GLONASS, Galileo) and multiple frequency bands through a single channel. The channel includes configurable components such as code generators that can produce different PRN codes, carrier wave generators that can operate at different frequencies, and correlation processors that can handle various signal types. This universal design allows the receiver to achieve multi-frequency and multi-system capability without proportionally increasing the number of physical channels, thereby reducing device complexity while maintaining high measurement precision for RTK and ionosphere correction applications
2Measurement precision
If a receiver processes signals from multiple satellite navigation systems simultaneously, then it improves location determination accuracy through redundancy and error correction, but it increases the number of channels required and processing complexity
Solution Approach 1:
The patent merges the processing of signals from multiple satellite navigation systems (GPS, GLONASS, Galileo) into a unified digital channel structure. The channel combines code generation for different satellite systems, carrier wave processing for multiple frequencies, and correlation processing into a single integrated processing path. This merging approach allows the receiver to simultaneously process signals from multiple systems through one channel rather than requiring separate dedicated channels for each system, thereby reducing the total number of channels needed and simplifying the overall processing architecture while maintaining the accuracy benefits of multi-system reception
3Object-affected harmful factors
If a receiver uses universal digital channels with configurable code generators and strobe generators, then it can adapt to different RF-part filters and suppress multipath errors, but it increases the complexity of code and signal generation
Solution Approach 1:
The patent implements dynamic and configurable code generation and strobe generation within the universal digital channel. The code generator can be programmed to produce different PRN codes, code rates, and code sequences depending on which satellite system is being processed. The strobe generator can dynamically adjust strobe width, strobe rate, and strobe positioning to optimize multipath suppression for different signal conditions and RF filter characteristics. This dynamic configurability allows the receiver to adapt to different scenarios and suppress multipath errors effectively, while the flexibility is achieved through software-controlled parameters rather than hardwired complexity
Data Source
AI summary
Disclosed is a system and method for processing signals received from different global navigation satellite systems. The receiver includes a number of universal digital channels. The universal digital channel can be used to receive and process different code signals of each of the three navigation satellite systems GPS, GLONASS, and GALILEO. The universal digital channels have the same structure. Each of them can be tuned to receive different signals. The core of the universal digital channel is a code generator and a universal strobe generator.