Beamforming GNSS Antenna Authentication for GPS Spoofing Detection
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Solution Overview
Problem
Existing GPS and GNSS systems face challenges in authenticating signals to detect spoofing, which can deceive navigation systems into misidentifying signal sources or locations, particularly in aerospace applications where accuracy and integrity are critical.
Innovation Solution
A system comprising antenna electronics, a digital signal processor, and a GPS or GNSS receiver that determines signal authenticity by comparing measured signal power with expected power based on expected satellite locations and antenna gain patterns, using beamforming techniques to direct gain towards authentic satellites and null out falsified signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal authentication techniques are implemented to detect spoofing, then signal integrity and accuracy are improved, but device complexity and resource requirements increase
Solution Approach 1:
The system uses its own existing antenna electronics and beamforming capabilities to perform authentication, rather than requiring separate dedicated authentication hardware. The antenna electronics already present in the device are utilized to measure signal power and compare against expected values, making the authentication process self-service and avoiding additional complexity
Solution Approach 2:
The existing antenna electronics are made multi-functional by using them for both primary navigation signal reception and authentication verification. The same hardware components perform dual purposes: receiving GPS/GNSS signals for navigation and simultaneously measuring signal characteristics for spoofing detection, thereby avoiding additional dedicated authentication hardware
2Difficulty of detecting and measuring
If dedicated authentication hardware is added to detect spoofed signals, then detection capability is improved, but resource requirements and system complexity increase
Solution Approach 1:
The system leverages existing antenna electronics already present in GPS/GNSS receivers to perform authentication measurements. No separate dedicated authentication hardware is required - the existing antenna elements and beamforming capabilities are reused for both navigation and authentication functions
Solution Approach 2:
The antenna electronics serve dual purposes: primary navigation signal reception and authentication verification. The same hardware resources are utilized for both functions, eliminating the need for additional dedicated authentication components and reducing overall resource requirements
3Measurement precision
If beamforming techniques are used to direct gain towards authentic satellites, then signal authentication accuracy is improved, but sensitivity to phase errors increases
Solution Approach 1:
The system measures signal power in multiple directions including off-beam directions where authentic signals should be attenuated. By checking that signals are properly suppressed in directions where they shouldn't be present, the system gains authentication capability without requiring perfect beamforming precision, thus reducing sensitivity to phase errors
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
This approach maintains primary navigation functions while detecting spoofed signals, reducing resource requirements and being tolerant to phase errors, thus ensuring accurate and secure Positioning, Navigation, and Timing (PNT) in RF-challenged environments.
Implementation Method 1
using beamforming techniques to direct gain towards authentic satellites and null out falsified signals
Implementation Method 2
The GPS or GNSS receiver can be configured to receive the signals from the antenna electronics, and measure a power of the respective signal
Data Source
AI summary
Techniques for satellite signal authentication. In an example, a Global Positioning System (GPS) or global navigation satellite system (GNSS) includes antenna electronics, a processor, and a GPS or GNSS receiver. The antenna electronics is configured to provide, to the GPS or GNSS receiver, signals, wherein the signals comprise GPS or GNSS satellite signals received from a set of GPS or GNSS satellites and/or one or more falsified signals, such as spoofer signals (falsified). The processor is configured to determine, based on an expected location of a respective GPS or GNSS satellite of the set of GPS or GNSS satellites, an expected gain or expected power for a respective signal of the signals. The GPS or GNSS receiver is configured to measure a power of the respective signal, compare the measured power to the expected gain or expected power, and determine whether the respective signal is falsified based on the comparison.