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In this work, we propose an innovation-based INS spoofing monitor that utilizes a tightly-coupled INS-GNSS integration in a Kalman filter. The performance of the monitor is evaluated when a spoofer tracks and estimates the aircraft position. To create the worst case spoofing conditions, we analytically derive a Kalman filter-based worst-case sequence of spoofed GNSS measurements. Utilizing this worst-case...
In this work, we develop, implement, and test a monitor to detect GPS spoofing attacks using residualbased Receiver Autonomous Integrity Monitoring (RAIM) with inertial navigation sensors. Signal spoofing is a critical threat to all navigation applications that utilize GNSS, and is especially hazardous in aviation applications. This work develops a new method to directly detect spoofing using a GPS/INS...
This paper introduces a method to compute an upper bound on the integrity risk of cycle resolution in the presence of bounded measurement errors and faults. In high accuracy applications such as shipboard landing and autonomous airborne refueling, carrier phase cycle ambiguities must be estimated and resolved as integers (or ‘fixed ambiguities’). In applications that also demand high integrity, the...
In this paper, a carrier phase-based monitor is developed to instantaneously detect ionospheric gradients using measurements from multiple, spatially separated ground antennas. Two monitor approaches based on traditional detection and estimation techniques are initially explored, and it is shown that their performance is highly dependent on how receivers' pairs (baselines) are selected for measurement...
This paper introduces new monitors for the detection of orbit ephemeris faults affecting differential carrier phase measurements in a shipboard aircraft landing application. Two shipboard monitors are first designed. While they provide high detection performance against two targeted fault types, they are ineffective against the other types of orbit ephemeris faults. In response, to protect the user...
In this paper, a methodology is developed to evaluate differential carrier phase navigation architectures subject to reference receiver faults. Carrier phase measurements can be used to provide high accuracy estimates of a user's position. But in applications that involve safety-of-life, such as in precision approach for autonomous shipboard landing, integrity also plays a critical role. One source...
In this paper, a methodology is developed to overbound the error in position estimation for carrier phase navigation systems subject to multipath error mis-modeling. In high accuracy and high integrity applications, carrier phase positioning systems with cycle resolution usually rely on time-filtering, in many cases using Kalman filters. Naturally, for a computed integrity risk to be meaningful, it...
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