RTK-GPS Aircraft Landing Guidance for ILS Cost Reduction
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Solution Overview
Problem
Conventional ILS systems are costly to maintain and install, especially for small airfields, and GPS-based systems lack accuracy due to geoid height variations and ionospheric errors, posing safety risks for aircraft landing.
Innovation Solution
Implementing a Real Time Kinetic-Global Positioning System (RTK-GPS) with pseudo GPS signal transmission from ground stations to correct geoid height and ionospheric errors, using correction GPS mobile and reference stations to provide accurate altitude and landing route guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ILS system is introduced to provide accurate landing guidance, then landing safety and guidance accuracy are improved, but installation and maintenance costs increase enormously
Solution Approach 1:
The patent uses GPS satellites as virtual ground-based navigation aids, creating a copy of the ILS functionality through satellite positioning. The system processes GPS signals to generate landing guidance information equivalent to traditional ILS, thereby eliminating the need for expensive ground-based ILS infrastructure while maintaining similar guidance capabilities
Solution Approach 2:
The patent replaces the mechanical and electrical ILS ground infrastructure (transmitters, markers, antennas) with a software-based GPS signal processing system. By substituting the physical ILS system with GPS signal analysis and computation, the system achieves cost reduction while maintaining navigation functionality
2Ease of manufacture
If conventional GPS positioning is used for aircraft landing, then installation cost is reduced, but positioning accuracy deteriorates due to geoid height variations and ionospheric errors
Solution Approach 1:
The patent incorporates feedback mechanisms by continuously monitoring GPS signal characteristics and comparing calculated positions with expected values. The system uses ionospheric delay measurements and geoid height corrections as feedback to adjust and refine positioning accuracy in real-time during the landing approach
Solution Approach 2:
The patent applies parameter changes by transforming raw GPS coordinates into corrected positioning data through geoid height adjustments and ionospheric delay compensation. The system modifies elevation parameters and horizontal position parameters using mathematical models to account for geoid variations and atmospheric effects
Data Source
AI summary
The aircraft landing guidance support system has a correction GPS mobile station and an information processing equipment, which includes a display unit and is configured to process an RTK-GPS signal received from the correction GPS mobile station and perform a prescribed display on the display unit. The aircraft landing integrated support system has a correction GPS reference station, a pseudo GPS signal transmitter, and the aircraft landing guidance support system. The information processing equipment stores a computer program configured to cause the information processing equipment to function as a means for recording landing route data containing landing route information, a means for recording current position information data containing current position information based on the RTK-GPS signal, and a means for displaying the landing route data and the current position information on the display unit of the information processing equipment.