Positioning Device Using Electromagnetic Interference to Counter Jamming
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Solution Overview
Problem
Navigation signals, such as those from GPS satellites, are susceptible to jamming due to low received power and limited transmit power, making accurate positioning challenging in jamming environments.
Innovation Solution
A method and device that determine an evolving position using electromagnetic interference by receiving navigation signals and interference, discerning the position of jamming antennas, and using detection and evaluation circuits to calculate the device's position even when navigation signals are jammed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic navigation signals are used for positioning, then positioning accuracy is improved, but the system becomes vulnerable to jamming due to low received power
Solution Approach 1:
The patent introduces electromagnetic interference signals as an intermediary to determine the position of jamming antennas. By detecting the interference patterns and using them to calculate the location of jamming sources, the system can compensate for the jamming effect and maintain positioning accuracy without directly relying on the jammed navigation signals alone.
Solution Approach 2:
The system continuously monitors the electromagnetic interference environment and uses the detected interference patterns to dynamically adjust positioning calculations. The feedback loop allows the system to detect when jamming is occurring and compensate for it in real-time, maintaining positioning reliability despite the presence of jamming signals.
2Device complexity
If the device relies solely on electromagnetic navigation signals, then the positioning system is simple, but positioning fails when signals are jammed
Solution Approach 1:
The patent makes the antenna arrangement multi-functional by enabling it to perform both traditional navigation signal reception and electromagnetic interference detection. The same antenna system serves dual purposes: receiving navigation signals for normal positioning and detecting interference patterns for jamming detection and compensation, thereby increasing positioning availability without proportionally increasing system complexity.
3Reliability
If the device detects and characterizes jamming antennas, then positioning reliability is improved, but measurement precision is reduced due to the time required for characterization
Solution Approach 1:
The system performs preliminary detection and characterization of jamming antennas during periods when navigation signals are still usable. By pre-characterizing the jamming sources and storing their positional information, the system prepares compensation data in advance, allowing for rapid positioning even when jamming occurs, thus balancing reliability improvement with minimal precision loss.
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 accurate determination of a device's position despite jamming, by characterizing jamming antennas and using inertial navigation to correct for drift, ensuring reliable positioning even when navigation signals are blocked.
Implementation Method 1
An antenna arrangement receives both the electromagnetic navigation signals and the electromagnetic interference
Implementation Method 2
A detection circuit determines each discerned position from the electromagnetic interference received at the device
Data Source
AI summary
A method and device determines an evolving position of a device using electromagnetic interference, which is jamming electromagnetic navigation signals. An antenna arrangement receives both the electromagnetic navigation signals and the electromagnetic interference. A discerned position is determined for each of one or more jamming antennas emitting the electromagnetic interference. A detection circuit determines each discerned position from the electromagnetic interference received at the device and at least one measurement of the evolving position using the electromagnetic navigation signals. The evolving position of the device is determined while the electromagnetic interference prevents subsequently measuring the evolving position using the electromagnetic navigation signals. An evaluation circuit determines the evolving position from the electromagnetic interference received at the device and from each discerned position of the one or more jamming antennas.