GNSS Correlator Reuse for BPSK and BOC Signal Processing
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Solution Overview
Problem
GNSS receivers face inefficiency in processing both BPSK and BOC modulated signals, as they require separate correlation units, leading to idle units and waste when switching between different modulation schemes.
Innovation Solution
A correlation device with multiple signal paths and a multiplexer that can convert BOC signals into BPSK-like signals, allowing the same correlation units to process both BPSK and BOC signals efficiently by removing subcarrier components or taking single sideband portions of the frequency spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate correlation units are provided for BPSK and BOC signals, then both modulation schemes can be processed, but resource waste occurs when one type of signal is idle
Solution Approach 1:
The patent makes correlation units universal by enabling them to process both BPSK and BOC signals through a signal conversion mechanism. A signal converter transforms BOC signals into an equivalent form that the standard BPSK correlation units can process, allowing a single set of correlation units to handle multiple signal types without idle resources
Solution Approach 2:
The patent changes the parameter representation of BOC signals by converting them into an equivalent complex baseband signal form. This parameter transformation allows the correlation units designed for BPSK to process BOC signals by modifying the signal's mathematical representation rather than requiring separate hardware
2Productivity
If multiple correlation unit groups are provided for different modulation schemes, then all signals can be processed simultaneously, but device complexity increases
Solution Approach 1:
The patent eliminates the need for separate correlation unit groups by making the correlation units universal through signal conversion. A single correlation unit can process both BPSK and converted BOC signals, reducing the overall number of units required while maintaining parallel processing capability through efficient signal transformation
3Measurement precision
If dedicated BOC correlation units are used, then BOC signals are processed accurately, but these units remain idle when processing BPSK signals
Solution Approach 1:
The patent transforms BOC signals into an equivalent complex baseband representation that preserves the correlation accuracy needed for precise signal processing. This parameter change allows standard correlation units to achieve the same measurement precision as dedicated BOC units would provide, without the idle time penalty
Data Source
AI summary
A correlation device and method for different modulated signals such as BPSK signal and BOC signal. According to the present invention, the correlation device has one or more sections. Each section comprises a correlation unit for executing correlation; a first signal path for passing a received signal directly to the correlation unit; a second signal path for transferring a BOC signal into a BPSK-like signal and passing the signal to the correlation unit. The correlation unit has a multiplexer for selecting to allow an output of one of the first and second signal paths to be subject to signal correlation. The correlation results of the respective sections can be combined.