Multi-GNSS Receiver Bias Compensation for Centimeter RTK
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Solution Overview
Problem
Global Navigation Satellite Systems (GNSS) face compatibility issues due to inherent biases in code and carrier measurements between receivers of different types, particularly when processing GLONASS signals, which affect Real-Time Kinematic (RTK) and network data processing.
Innovation Solution
The method involves determining and applying receiver-type biases to estimate carrier floating-point ambiguities, allowing for the resolution of GLONASS carrier phase ambiguities and enabling combined FDMA/CDMA solutions at centimeter-level precision, applicable to RTK positioning and post-processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data from receivers of different types are mixed for GNSS processing, then versatility and adaptability improve, but measurement precision deteriorates due to inherent biases in code and carrier measurements
Solution Approach 1:
The patent applies parameter changes by determining receiver-type biases for different receiver types and applying these biases as correction parameters to the code and carrier measurements. This allows measurements from receivers of different types to be combined while maintaining measurement precision through bias compensation.
2Adaptability or versatility
If GLONASS FDMA data is processed with other GNSS data, then system versatility improves, but measurement precision deteriorates due to frequency differences causing non-cancellation of receiver bias terms
Solution Approach 1:
The patent determines receiver-type biases specifically for GLONASS FDMA data processing and applies these as correction parameters. This compensates for the frequency differences between GLONASS satellites and eliminates the non-cancellation of receiver bias terms, enabling precise combined multi-GNSS processing.
3Measurement precision
If receiver-type biases are determined and applied, then measurement precision improves, but device complexity increases due to additional processing steps
Solution Approach 1:
The patent determines receiver-type biases in advance based on receiver identification, and then applies these pre-determined biases to the measurements. This preliminary action simplifies the overall processing by avoiding the need for complex real-time bias estimation while maintaining high measurement precision.
Data Source
AI summary
Computer-implemented methods and apparatus are presented for processing data collected by at least two receivers from multiple satellites of multiple Global Navigation Satellite Systems (GNSS), where at least one GNSS is Frequency Division Multiple Access (FDMA). Data sets are obtained which comprise a first data set from a first receiver and a second data set from a second receiver. The first data set comprises a first FDMA data set and the second data set comprises a second FDMA data set. At least one of a code bias and a phase bias may exist between the first FDMA data set and the second FDMA data set. At least one receiver-type bias is determined, to be applied when the data sets are obtained from receivers of different types. The data sets are processed, based on the at least one receiver-type bias, to estimate carrier floating-point ambiguities. Carrier integer ambiguities are determined from the floating-point ambiguities. The scheme enables Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS) carrier phase ambiguities to be resolved and used in a combined FDMA/Code Division Multiple Access (CDMA)(e.g., GLONASS/Global Positioning System (GPS) centimeter-level solution. It is applicable to real-time kinematic (RTK) positioning, high-precision post-processing of positions and network RTK positioning.