Spatial and Polarization Domain-Based GNSS Processing for Multipath Mitigation using a Dual-Polarized Antenna Array


Eric M. Hahn

Date of Award


Document Type


Degree Name

Master of Science

First Advisor

Chris G. Bartone, PhD

Second Advisor

Sanjeev Gunawardena, PhD


This thesis demonstrates an antenna manifold calibration method for a dual polarized antenna array and RF front-end for use in GNSS applications. The process described in this thesis uses a two-step process to characterize the RF receiver front-end and the antenna array. A GNSS signal simulator is used to generate a reference signal for calibration of a multi-channel RF front-end. An anechoic chamber is used to characterize the phase and gain biases of the dual-polarized phased antenna array. The results are then verified in a live-sky known environment. These combined results can then be used to characterize and compensate for the biases of the RF receiving system in a live-sky operational environment for beamforming and direction of arrival GNSS applications to mitigate interference from multipath. The antenna array and front-end, along with the calibration parameters, are then used in a live multipath environment to show polarization and spatial observability of multipath. The multipath environment consists of positive elevation angle multipath, reflected from a conductive surface. Polarization observability is shown by tracking a received signal coherently using both a RHCP and LHCP receiver channel. Spatial observability is shown by implementing a deterministic beamformer receiver channel. The results presented show that the polarization and spatial domains can be used simultaneously to mitigate multipath.


© 2022 Eric M. Hahn.

Ohio University Masters thesis sponsored by the ANT Center.

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