Wide Area Direction Finding Using Distributed RF Receivers
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Solution Overview
Problem
Current direction finding systems are limited by their reliance on single receivers, which can provide inaccurate and imprecise location data for short duration signals and require high-speed data connections, restricting their usability in various environments.
Innovation Solution
A wide area direction finding system utilizing multiple RF receiving units for triangulation, capable of operating with minimal bandwidth connectivity, and equipped with GPS technology for time-syncing, allowing for precise location determination and flexibility in connectivity options, including physical wires, cellular services, and satellites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple RF receiving units are used for triangulation, then measurement precision of target location is improved, but device complexity increases
Solution Approach 1:
The system divides the direction finding function into multiple independent RF receiving units distributed across different geographic areas. Each unit independently receives signals and transmits minimal data to a central display computer, allowing precise triangulation without requiring a complex integrated system. This segmentation enables accurate location determination while keeping individual components relatively simple.
2Measurement precision
If high-speed data connections are required for direction finding, then measurement precision is improved, but adaptability to different environments deteriorates
Solution Approach 1:
The system extracts and transmits only the essential minimal data elements from each RF receiving unit to the display computer, rather than transmitting continuous high-speed data streams. This extraction approach maintains location accuracy while dramatically reducing bandwidth requirements, enabling operation in environments with limited connectivity such as remote areas or during mobile operations.
3Adaptability or versatility
If the system operates with minimal bandwidth connectivity, then adaptability to different environments is improved, but productivity of data processing deteriorates
Solution Approach 1:
Each RF receiving unit performs preliminary signal processing and extraction of essential location data locally before transmission. This preliminary action at the distributed units ensures that only critical minimal data is transmitted over the bandwidth-limited connection, maintaining both environmental adaptability and efficient data processing by avoiding unnecessary data transmission and central processing overhead.
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 precise location of both stationary and moving targets with increased accuracy and flexibility, accommodating different frequencies and environments, and allows for tracking of short duration targets, such as a missing plane, even after the signal stops transmitting.
Implementation Method 1
multiple radio frequency (RF) receiving units, which may be in different geographic areas to make use of triangulation
Implementation Method 2
Each RF unit's distance from the signal may be computed through time distance of arrival techniques
Implementation Method 3
The system may be designed to measure the phase or frequency, among other things, of the received signal in multiple ways. For example, through the pseudo Doppler method or phase correlation
Data Source
AI summary
Disclosed, among other things is a wide area direction finding system comprising multiple radio frequency (RF) receiving units and a display computer. The RF receiving units may be in different geographic areas to make use of triangulation to precisely locate a target, allowing for increased area coverage and accuracy when locating a target. Locating a target may draw from real-time information using a “live mode,” or from a past event using a “history mode” on the display computer.