GNSS spoofing is a growing concern due to the increasing use of GNSS in safety and economically important applications. The foremost task to manage the GNSS spoofing threat is detection. Indeed, many potential means and measurements have been proposed for spoof detection. However, there exist no panaceas. Rather, we should rely on many different detection means to provide robust detection. One measurement useful for detection is direction of arrival (DOA), which we can get from many sources such as array and dual polarization antenna (DPA). Even with accurate DOA measurements, good monitor tests are needed to make an accurate decision or determination of spoofing. This paper develops and examines monitor tests suitable for DOA based spoof detection. Developed tests aim to have provable and conservative performance levels making them suitable for safety of life applications. Several tests are developed including signal pair comparisons based on statistical hypothesis tests, Bayesian estimates as well as comprehensive all satellites in view comparisons. On-air spoofing results from a DPA are used to validate performance. The developed techniques must detect simple cases such as when all examined signals are from a single spoofer (“all spoof” case) and challenging cases where there is a mix of genuine signals and spoofed signals (“mixed spoof” case). Another consideration is that measurements will typically be relative DOA as platform attitude may or may not be known. Solving the relative DOA problem also captures the simpler case where we have some knowledge of platform attitude (i.e. absolute DOA).
[1]
Per Enge,et al.
Validation of a Controlled Reception Pattern Antenna (CRPA) Receiver Built From Inexpensive General-purpose Elements During Several Live-jamming Test Campaigns
,
2013
.
[2]
Alison Brown,et al.
Miniaturized GPS Antenna Array Technology
,
1999
.
[3]
Todd E. Humphreys,et al.
GNSS Spoofing Detection Using Two-Antenna Differential Carrier Phase
,
2014
.
[4]
Gérard Lachapelle,et al.
Analysis of GNSS Beamforming and Angle of Arrival Estimation in Multipath Environments
,
2011
.
[5]
Andrew O'Brien.
Adaptive Antenna Arrays for Precision GNSS Receivers
,
2009
.
[6]
Dennis M. Akos,et al.
Demonstrating Single Element Null Steering Antenna Direction Finding for Interference Detection
,
2018
.
[7]
Achim Hornbostel,et al.
Performance assessment of antenna array algorithms for multipath and interferers mitigation
,
2007
.
[8]
Andriy Konovaltsev,et al.
Joint Antenna Array Attitude Tracking and Spoofing Detection Based on Phase Difference Measurements
,
2016
.
[9]
Todd E. Humphreys,et al.
Receiver-Autonomous Spoofing Detection: Experimental Results of a Multi-Antenna Receiver Defense against a Portable Civil GPS Spoofer
,
2009
.
[10]
Per Enge,et al.
Towards a Practical Single Element Null Steering Antenna
,
2017
.
[11]
Per Enge,et al.
Navigation accuracy and interference rejection for GPS adaptive antenna arrays
,
2007
.