SBAS to GBAS Data Conversion for Satellite Automatic Landing
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Solution Overview
Problem
Current systems face challenges in enabling satellite navigation-based automatic landings of aircraft at airports without significant effort, particularly due to the complexity and cost of installing Ground-Based Augmentation System (GBAS) infrastructure and the inability to continue automated precision approaches using Satellite-Based Augmentation System (SBAS)-supported position calculations.
Innovation Solution
A method and device that convert Satellite-Based Augmentation System (SBAS) correction data into Ground-Based Augmentation System (GBAS) correction data, combining it with Final Approach Segment (FAS) data to form GLS data packets, which are then transmitted to aircraft via a radio link, allowing for standard GLS landings without the need for conventional GBAS infrastructure or precise reference receiver setups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GBAS correction data is used for satellite navigation-based automatic landing, then positioning precision is improved (order of one meter), but device complexity and installation effort increase significantly due to the need for reference receivers at known positions and linking them to a central unit
Solution Approach 1:
The patent uses SBAS correction data as a substitute or copy alternative to GBAS correction data. Instead of implementing the complex GBAS infrastructure with reference receivers, the system receives SBAS correction data from satellites and processes it to generate equivalent positioning corrections, thereby achieving similar positioning precision without the ground-based infrastructure complexity
Solution Approach 2:
The patent introduces an intermediary processing system that receives SBAS correction data and converts it into a format usable for automatic landing. This intermediary layer (the conversion device and method) bridges the gap between SBAS data and GLS requirements, enabling the use of simpler satellite-based data in place of complex ground-based GBAS infrastructure
2Area of stationary object
If SBAS correction data is used for position determination, then coverage area is improved, but automation of precision approaches is lost at 250 feet altitude due to insufficient on-board database and connection requirements for formal approval
Solution Approach 1:
The patent performs preliminary conversion of SBAS correction data into GBAS-compatible format before the automatic landing sequence begins. By pre-processing the correction data and preparing it in the required format, the system ensures that when the aircraft reaches decision height (250 feet), all necessary data is already prepared and formatted correctly, enabling seamless continuation of automation through to landing
Solution Approach 2:
The patent changes the format and parameters of SBAS correction data to match GBAS requirements. By transforming the data structure, coordinate systems, and presentation format of SBAS corrections, the system makes them compatible with existing GLS/GBAS processing equipment, thereby enabling automation continuation without requiring separate SBAS-specific approval pathways
3Ease of operation
If GLS data packets are transmitted via VHF radio link, then direct routing to autopilot is achieved, but the system requires complex ground infrastructure with transmitters and approved data transmission routes
Solution Approach 1:
The patent replaces the mechanical/physical GBAS ground infrastructure (transmitters, reference receivers, cable connections) with a satellite-based data transmission system. Instead of using VHF radio links from ground transmitters, the system uses satellite downlink for correction data and other available data routes for ADAS data, substituting physical ground infrastructure with space-based infrastructure
Data Source
Figure 1
AI summary
In order to provide an aircraft (18) with GLS (GBAS Landing System) data packets (12) for a satellite navigation-based automatic landing, the GLS data packets (12) comprising GBAS (Ground-based Augmentation System) correction data (8, 10) for a satellite navigation and FAS data that describes a set approach path (13) of the aircraft (18), SBAS (Satellite-based Augmentation System) correction data (4) for the satellite navigation are received from an SBAS satellite (5). The received SBAS correction data (4) are converted into GBAS correction data (8). The GBAS correction data (8) obtained by the conversion are combined with the FAS data (13) in the GLS data packets (12). The GLS data packets (12) are transmitted over a radio link (21) to the aircraft (18).