Rotating Antenna Array for GNSS Jamming Source Localization
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Solution Overview
Problem
Existing methods for locating GNSS signal jamming sources require stationary beacons, which are costly and cumbersome, and suffer from installation and maintenance challenges due to the need for precise angular measurements and multiple beacons.
Innovation Solution
A method involving rotating two antennas about a common axis to determine the phase shift between GNSS signals, using complex cross-correlation to calculate the direction of the jamming source without stationary beacons, allowing precise localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If stationary beacons are used for locating GNSS jamming sources, then location precision can be improved by approaching the beacons, but installation and maintenance costs increase due to the need for multiple beacons and precise angular measurements
Solution Approach 1:
The patent transforms the static beacon system into a dynamic one by rotating the antenna array. Instead of having multiple stationary beacons, a single antenna array rotates to sweep through different angular positions, dynamically collecting signal data from multiple directions. This dynamic approach eliminates the need for multiple stationary beacons while maintaining the ability to determine precise angular directions to the jamming source.
Solution Approach 2:
The rotating antenna array effectively creates multiple virtual beacons at different angular positions without physically deploying multiple actual beacons. By rotating a single antenna array through different angles, the system copies the functional effect of having multiple stationary beacons distributed in space, thereby reducing installation and maintenance requirements while preserving location precision.
2Measurement precision
If the number of beacons is increased to improve location accuracy, then measurement precision improves, but cost of installation and maintenance increases
Solution Approach 1:
The patent uses a rotating antenna array that dynamically assumes multiple positions during operation. A single physical antenna array replaces multiple stationary beacons by rotating through different angular positions and collecting signal data at each position. This dynamic reuse of a single resource eliminates the need to deploy and maintain multiple physical beacons while achieving the same measurement precision through temporal multiplexing of the antenna array's position.
Solution Approach 2:
The single rotating antenna array performs the function of multiple beacons simultaneously. By rotating through different angular positions, one antenna array universalizes the beacon function across multiple spatial locations and time points, thereby achieving multi-functionality with a single device. This reduces the quantity of physical beacons needed from multiple to just one.
3Measurement precision
If stationary beacons are used, then angular sector crossing can determine jamming source position, but ambiguity removal requires multiple beacons increasing device complexity
Solution Approach 1:
The rotating antenna array dynamically sweeps through angular sectors and continuously tracks the jamming source. By rotating and measuring phase differences at multiple angular positions, the system dynamically builds up angular information that uniquely identifies the jamming source direction. This dynamic angular sampling eliminates the ambiguity that would require multiple stationary beacons to resolve, as the temporal sequence of measurements from a rotating array provides unambiguous directional information.
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 and cost-effective localization of GNSS jamming sources by eliminating the need for stationary beacons, reducing installation and maintenance costs while maintaining precision.
Implementation Method 1
computation of a phase shift between the jamming signals acquired
Implementation Method 2
computation of a complex coefficient of cross-correlation between the samples of the GNSS signals acquired in the corresponding position
Data Source
AI summary
A method for locating a GNSS signal-jamming source, including setting two antennas in rotation about a common axis of rotation so as to form N different respective positions corresponding to various angles of rotation, in each of the N positions, using each antenna to acquire a GNSS signal including a payload signal and a jamming signal, computing a phase offset between the acquired jamming signals, and determining a direction of the jamming source using a maximum value of the N computed phase shifts.