Abstract
Vulnerability of Global Navigation Satellite System (GNSS) signals to strong radio frequency (RF) signals has resulted in new research needs. Based on the type of interference various mitigation schemes have been proposed. Antenna array processing is one of the powerful methods for interference mitigation. However, data collection using real antenna arrays to develop and test array processing methods is considerably complex. Therefore, it is very useful to develop a simpler way of obtaining array data using a simulation platform. This paper introduces a new approach to simulate GNSS signals for an antenna array. Employing the user trajectory information recorded using a single antenna hardware simulator and the known physical configuration of the antenna array, GNSS signals are simulated for each antenna element. Additionally, directional interference signals can be generated and added to the GNSS signals. Fidelity of single antenna simulations is evaluated by comparing the tracking parameters from this simulator with two commercially available GNSS simulators, namely the Spirent’s GSS-7700 and Rohde & Schwarz’s SMBV-100. Simulations are verified by evaluating C/N0 values, carrier Doppler and code phase. Two approaches of array signal generation i.e. one based on a reference antenna and another based on independent antenna’s signal parameters, are compared. Capability of the simulator to generate interference scenarios is demonstrated with several examples and comparisons in acquisition metrics, position errors and beam patterns.
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