Spatial and Polarization Domain-Based GNSS Processing for Multipath Mitigation using a Dual-Polarized Antenna Array
Date of Award
Master of Science
Chris G. Bartone, PhD
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.
Hahn, Eric M., "Spatial and Polarization Domain-Based GNSS Processing for Multipath Mitigation using a Dual-Polarized Antenna Array" (2022). Theses and Dissertations. 5556.