Triple Frequency GNSS Receiver Resolving Carrier Phase Ambiguities
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Solution Overview
Problem
Current satellite navigation systems face challenges in resolving carrier phase ambiguities, particularly with triple frequency signals, due to increased complexity and the need to combine phase biases, which affects precision and accuracy in positioning.
Innovation Solution
A triple frequency GNSS receiver uses an observation model that directly processes code and phase biases, along with carrier phase ambiguities for each satellite, without relying on phase biases from other receivers, incorporating filtering circuits and a state vector that includes receiver position, clock values, and carrier phase ambiguities to solve ambiguities independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If triple frequency signals are used to enhance positioning precision, then measurement precision is improved, but device complexity increases due to the number of possible signal combinations
Solution Approach 1:
The patent segments the complex triple frequency signal processing into independent single-frequency processing channels. Each channel processes one frequency separately, avoiding the need to handle all possible combinations of three frequencies simultaneously. This segmentation reduces the computational complexity while maintaining the precision benefits of multi-frequency processing.
Solution Approach 2:
The patent introduces an intermediary observation model that mediates between the raw triple frequency measurements and the final positioning solution. This model processes each frequency independently through separate channels before integrating results, acting as a mediator that simplifies the overall processing architecture while preserving measurement precision.
2Reliability
If phase biases are combined to resolve ambiguities, then carrier phase ambiguities are resolved, but implementation complexity increases and reliability decreases
Solution Approach 1:
The patent segments the ambiguity resolution process by handling each frequency independently rather than combining all phase biases across multiple frequencies. This segmentation isolates the complexity to individual frequency channels, making the implementation more manageable and improving overall reliability through independent processing.
Solution Approach 2:
The patent extracts the phase bias combination step from the ambiguity resolution process. By removing the need to combine phase biases across multiple frequencies, the patent simplifies the implementation while maintaining reliable ambiguity resolution through independent single-frequency processing.
3Measurement precision
If multiple reference receivers are used to eliminate biases, then measurement precision is improved, but loss of time increases due to additional processing requirements
Solution Approach 1:
The patent segments the processing by eliminating the need to process multiple reference receivers simultaneously. Each frequency is processed independently with its own reference, reducing the computational burden and accelerating convergence while maintaining precision through the segmented approach.
Solution Approach 2:
The patent applies partial action by processing only the necessary minimum of reference receivers for each frequency rather than processing all possible combinations across multiple frequencies. This partial processing approach reduces time loss while achieving sufficient precision for reliable positioning.
Data Source
AI summary
The invention discloses a receiver and a method to process navigation signals from one or more GNSS constellation, wherein an observation model and a measurement model allow a direct calculation of the carrier phase ambiguities. More specifically, in a triple frequency implementation, the receiver calculates in turn the extrawidelane, widelane and narrowlane ambiguities. The code and carrier phase biases can also be directly calculated. Thanks to the invention a quicker acquisition and tracking of a precise position, which will also be less noisy than a prior art solution, especially in some embodiments of the invention using a RAIM and/or a gap-bridging function. Also, code smoothing using the Doppler and low latency clock synchronization allow to decrease the noise levels of the precise point navigation solutions.