Partial Decoding Composite Signal Receiver
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Solution Overview
Problem
Existing navigation satellite receivers require complex circuitry and high energy consumption to fully decode multiplexed binary offset carrier signals, necessitating a simpler and more energy-efficient solution.
Innovation Solution
A receiver design that partially decodes composite signals using a front-end for down-conversion, an analog-to-digital converter, a multiplexer, a ranging code generator, and a code correlator to produce a locally generated reference signal, allowing for correlation with the received signal to decode at least a portion of the composite signal while leaving another portion undecoded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If full decoding of multiplexed binary offset carrier signal is implemented, then complete signal information is obtained, but receiver complexity and energy consumption increase
Solution Approach 1:
The patent segments the composite navigation signal into multiple components (pilot signal, data signal, ranging code) and processes only the essential portions needed for basic functionality. The receiver extracts and processes the pilot signal and ranging code while leaving other portions undecoded, thereby reducing complexity while maintaining essential signal information.
Solution Approach 2:
The patent extracts only the necessary components from the full composite signal for processing. Specifically, it extracts the pilot signal for carrier tracking and the ranging code for position calculation, while intentionally leaving other signal portions undecoded. This selective extraction reduces receiver complexity and energy consumption while preserving essential navigation functionality.
2Loss of information
If full decoding of multiplexed binary offset carrier signal is implemented, then complete signal information is obtained, but energy consumption increases
Solution Approach 1:
The patent segments the composite navigation signal into multiple components and processes only the essential portions. By dividing the signal processing into discrete segments (pilot signal processing, ranging code processing) and selectively processing only necessary segments, the receiver reduces energy consumption while maintaining essential signal information.
Solution Approach 2:
The patent applies partial action by decoding only the portion of the composite signal that is necessary for basic navigation functionality (pilot signal for tracking, ranging code for positioning). It intentionally performs incomplete decoding by leaving other signal portions undecoded, thereby reducing energy consumption while preserving sufficient signal information for operational purposes.
3Device complexity
If partial decoding is implemented, then receiver complexity is reduced, but signal-to-noise ratio may degrade
Solution Approach 1:
The patent applies local quality by concentrating processing resources on specific critical signal components (pilot signal and ranging code) while leaving other portions undecoded. By enhancing the quality of processing for these specific local portions of the signal that are most critical for navigation accuracy, the system maintains signal-to-noise ratio performance while reducing overall complexity.
Data Source
AI summary
A first signal generator is arranged to generate a first signal. A data storage device is configured to provide a null code. A multiplexer is capable of multiplexing the first signal and the null code consistent with a predetermined time sequence for expression of the null code in a produced precursor signal. A ranging code generator is arranged for generating a ranging code. A mixer is capable of accepting the ranging code and the precursor signal and outputting a locally generated reference signal. After down-conversion and digitization of the received composite signal, the code correlator can correlate the digital received composite signal to the locally generated reference signal to decode at least a first portion of the received composite signal, while leaving a second portion of the received composite signal undecoded.