Satellite Geo-positioning Validation via Offboard Reference Processing
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Solution Overview
Problem
Existing radio navigation devices on board mobile carriers face challenges in enhancing geo-positioning precision and integrity due to limitations in processing resources and regulatory constraints, particularly in the presence of hardware failures, interference, and jamming.
Innovation Solution
A method and system that transmit baseband digitized signals from the onboard radio navigation device to a reference processing station for redundant and segregated processing, allowing for the validation of navigation information and augmentation of precision through complementary processing operations, including inertial positioning, multi-constellation calculations, and monitoring of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If onboard radio navigation devices process radio navigation signals to calculate navigation information, then navigation information is provided, but processing precision and robustness are limited by onboard processing resources
Solution Approach 1:
The system divides processing into two segments: onboard processing for real-time navigation information calculation, and offboard reference processing for validation and augmented precision calculation. This segmentation allows each part to be optimized independently, with the reference station providing enhanced processing without burdening the limited onboard resources.
Solution Approach 2:
The reference processing station acts as an intermediary that receives baseband digitized signals from the onboard device, performs independent processing to calculate second navigation information, and provides validation and augmented precision results back to the onboard system, thereby enhancing overall precision without requiring complex onboard processing.
2Reliability
If validation and robustness enhancement methods are implemented on board, then geo-positioning integrity is improved, but algorithmic complexity and processing resource requirements increase substantially
Solution Approach 1:
Instead of implementing complex validation algorithms onboard, the system inverts the approach by performing validation processing offboard at a reference station. The reference station independently processes the same signals and validates the onboard results, thereby improving reliability without increasing onboard algorithmic complexity.
Solution Approach 2:
The reference processing station creates a copy of the onboard processing operations to independently calculate second navigation information from the same baseband digitized signals. This copying approach enables validation and robustness enhancement without requiring complex algorithms onboard, as the reference station performs the computational heavy lifting.
3Ease of manufacture
If certified onboard systems are designed according to standardized processing architectures, then regulatory compliance is achieved, but system design flexibility is constrained
Solution Approach 1:
The system adds a new dimension to the architecture by introducing an offboard reference processing station that operates independently from the standardized onboard processing architecture. This dimensional expansion allows the system to maintain compliance with standardized onboard processing while gaining flexibility through the reference station's complementary processing operations.
4Reliability
If hardware failures, interference, and jamming are present, then navigation reliability deteriorates, but existing methods cannot sufficiently improve precision and robustness without excessive resource requirements
Solution Approach 1:
The reference processing station performs preliminary processing of baseband digitized signals to calculate second navigation information before final validation. This preliminary action includes validation operations and augmented precision calculations that prepare enhanced results in advance, improving robustness against hardware failures and interference without degrading real-time processing efficiency onboard.
Data Source
AI summary
The invention relates to a method and system for the validation of satellite-based positioning. The system comprises a radio navigation device (10) installed on board a mobile carrier (2), including a satellite geo-positioning device (12) able to receive a composite radio signal including a plurality of radio navigation signals each transmitted by a transmitting satellite and including time-synchronization and position-reference information, the radio navigation device being able to carry out processing of the received radio navigation signals to calculate first navigation information including information on the geographical position, speed and time of the carrier.The radio navigation device (10) is capable of transmitting baseband digitized signals (IF1, . . . , IFN) from radio navigation signals received at the reference processing station (16), the reference processing station (16) is capable of carrying out processing (29) similar to the processing (20), carried out by said radio navigation device (10), of the digitized signals (IF1, . . . , IFN) in order to calculate second navigation information, and the system comprises means (22, 42) for validating the first navigation information in accordance with the second navigation information calculated by the reference processing station (16).