Electromagnetic Navigation Signal Analysis Using Proxy Transmitters
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Solution Overview
Problem
Current methods for analyzing multipath propagation of navigation signals, particularly in air traffic navigation systems, are inefficient due to the complexity of systems and the difficulty in assessing the scattering behavior of moving objects, leading to challenges in planning and evaluating instrument landing systems (ILS) safely and economically.
Innovation Solution
A measurement method using proxy transmission devices that operate with time offsets and distinct pause or transmission durations to analyze navigation signals, allowing for high temporal resolution and reduced complexity in measurement devices, without the need for synchronization between transmitting and receiving devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurements are conducted at real airports to assess scattering behavior of moving objects, then measurement accuracy is improved, but device complexity and measurement cost increase significantly
Solution Approach 1:
The patent creates a scaled-down model airport environment that replicates the scattering behavior of real airport objects. Instead of measuring at a full-scale airport, the invention uses a reduced model with proportional dimensions that maintains the essential electromagnetic scattering characteristics, thereby reducing system complexity while preserving measurement accuracy.
Solution Approach 2:
The patent applies scaling factors to reduce the physical dimensions of the measurement environment. By changing the spatial parameters (length, width, height) according to a scaling factor, the invention transforms a complex real airport measurement setup into a simpler scaled model that maintains electromagnetic propagation characteristics.
2Reliability
If measurements are conducted at real airports during regular flight operations, then measurement reliability is improved, but availability time is reduced
Solution Approach 1:
The scaled model airport can be operated independently of real airport flight schedules. The model environment allows measurements to be conducted at any time without interfering with actual aviation operations, thereby maintaining measurement reliability while significantly improving availability and eliminating the need to wait for specific flight operation windows.
3Measurement precision
If the entire complex airport environment is reproduced for measurement, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential scattering objects and environmental features necessary for measuring electromagnetic propagation characteristics. Instead of reproducing the entire complex airport environment, the invention identifies and includes only the critical elements (such as representative buildings, terrain features, and object configurations) that generate the desired scattering patterns, thereby reducing environmental complexity while maintaining measurement accuracy.
Solution Approach 2:
The scaled model focuses on reproducing the local scattering characteristics of specific objects and areas rather than the entire airport environment. By concentrating on the essential local features that affect electromagnetic propagation, the invention achieves accurate measurements without the complexity of reproducing all airport infrastructure.
4Device complexity
If measurements are conducted in a scaled environment, then device complexity is reduced, but frequency must be increased to maintain scattering behavior
Solution Approach 1:
The patent systematically adjusts the frequency parameter to compensate for the scaled-down dimensions. By increasing the frequency according to the scaling factor, the invention maintains the electromagnetic scattering characteristics in the reduced model, ensuring that the scaled environment produces the same scattering patterns as the full-scale airport at the original frequency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient analysis of navigation signal propagation with high temporal resolution, simplifying the measurement process and allowing for the evaluation of movement effects and Doppler effects, thereby improving the planning and safety of navigation systems.
Implementation Method 1
Measurement method for examining the multipath propagation and scattering of electromagnetic waves
Implementation Method 2
Multipath propagation, ie the change in a navigation signal due to reflections or scattering from objects on a path between transmitter and receiver
Implementation Method 3
the change in a navigation signal due to reflections or scattering from objects on a path between transmitter and receiver
Implementation Method 4
A proxy transmission device is assigned to each of the navigation signal components and emits the navigation signal components in a time-resolved manner
Implementation Method 5
An analysis device is coupled to the receiving device and performs an evaluation of the received amplitude values in order to assign the proxy transmission device to time segments of the received amplitude values
Data Source
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Figure 2~3
Figure 4
AI summary
A measurement method for analysing the propagation of electromagnetic navigation signals, wherein each of the navigation signals is associated with at least one representative transmitting device with a temporal signal supply scheme unambiguously associated with the navigation signal. The representative transmitting devices are at least occasionally operated in a staggered manner. Each representative transmitting device is associated with a characteristic transmission-free leading pause duration and a transmission-free trailing pause duration or a characteristic transmission duration. An analysis device is coupled to a receiving device and time-dependent amplitude detection is carried out, wherein the temporal profile of the received amplitude values is evaluated by the analysis device in order to associate the representative transmitting device with time segments of the received amplitude values. For this purpose, the pause durations and/or the transmission durations in the temporal profile are evaluated and the original transmitting devices of the signal are determined using this information.