GPS GLONASS Receiver Shared Front-End AGC Design
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Solution Overview
Problem
Current systems require separate receive paths for GPS and GLONASS signals, leading to increased component count and reduced position accuracy due to the need for distinct signal processing for each satellite system.
Innovation Solution
A receiver design that incorporates a dual-mode interface and shared front-end components, including a single analog front-end, digital front-ends for GPS and GLONASS, and automatic gain control, allowing simultaneous processing and optimization of both GPS and GLONASS signals to improve position determination accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate receive paths are used for GPS and GLONASS signals, then each signal type can be processed independently, but the component count increases and position accuracy decreases
Solution Approach 1:
The patent combines GPS and GLONASS signal processing into a single receive path by using a polyphase filter bank that can handle multiple frequency channels simultaneously. The filter bank is configured to process both GPS L1 C/A code signals and GLONASS L1 signals through shared front-end components including the analog-to-digital converter, reducing component count while maintaining independent signal processing capability through digital signal separation based on frequency and code characteristics
Solution Approach 2:
The patent implements a universal receive path where the polyphase filter bank and subsequent processing components can universally handle both GPS and GLONASS signals. The system uses a single local oscillator and mixer that can be tuned to different frequencies, with the polyphase filter bank dynamically configured to process signals from either satellite system or both simultaneously, eliminating the need for dedicated separate receive paths
2Measurement precision
If separate receive paths are used for GPS and GLONASS signals, then signal processing is specialized, but position accuracy is reduced due to inability to simultaneously use both satellite systems
Solution Approach 1:
The patent employs dynamic configuration of the polyphase filter bank to adapt to different signal types. The filter bank can be dynamically reconfigured via control signals to process GPS signals with appropriate code correlations, then switch to process GLONASS signals with different frequency offsets and code characteristics. This dynamic adaptability allows the single receive path to maintain high measurement precision for both satellite systems while enabling simultaneous operation to improve position accuracy through increased satellite availability
3Device complexity
If a single polyphase filter bank is used for both GPS and GLONASS, then component count is reduced, but signal processing complexity increases
Solution Approach 1:
The patent segments the signal processing within the single polyphase filter bank by creating distinct processing branches for GPS and GLONASS signals. The filter bank is divided into multiple channels, each capable of being independently configured for specific satellite systems. Control logic segments the incoming signal stream, directing GPS signals to appropriate correlation channels and GLONASS signals to frequency-offset channels, thereby managing processing complexity through systematic segmentation while maintaining component efficiency
Data Source
AI summary
A receiver for receiving both GPS signals and GLONASS signals is provided. This receiver includes an analog front end (AFE), a GPS digital front end (DFE) and a GLONASS DFE for receiving an output of the AFE, and a dual mode interface (DMI) for receiving outputs of the GPS and GLONASS DFEs. Search engines are provided for receiving outputs of the DMI. Notably, certain front-end components of the AFE are configured to process both the GPS signals and the GLONASS signals.