Title: A Collaborative Technique for Spatial Interference Reduction in Multi-Node Antenna Arrays with Antenna Diversity
Author(s): Kenneth L. Collier Jr., Laurie L. Joiner
Published in: Proceedings of IEEE/ION PLANS 2018
April 23 - 26, 2018
Hyatt Regency Hotel
Monterey, CA
Pages: 92 - 101
Cite this article: Collier, Kenneth L., Jr., Joiner, Laurie L., "A Collaborative Technique for Spatial Interference Reduction in Multi-Node Antenna Arrays with Antenna Diversity," Proceedings of IEEE/ION PLANS 2018, Monterey, CA, April 2018, pp. 92-101.
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Abstract: It is well known that civilian Global Positioning System (GPS) receivers are vulnerable to interference. Robust interference reduction can be accomplished through a combination of temporal and spatial filtering using antenna arrays; however, current solutions absorb surface area and add weight to the host platform. These rigid fixed arrays are impractical for systems whose mobility and portability are distinguishing qualities such as smartphones, smart sensors and autonomous vehicles. Research is needed to expand the interference mitigation options available to GPS-dependent platforms constrained by size, weight and power (SWAP) while maintaining their mobility. This paper formulates a collaborative solution where independent receiver nodes behave as antennas in a multi-node antenna (MNA) array. Wideband interference mitigation is accomplished through spatial null-steering with space-time adaptive processing (STAP). Selection-combining diversity is proposed to circumvent grating nulls which reduce the usable beamspace (UBS) of the MNA array. A modeling and simulation (M&S) tool is leveraged to show that the MNA array with antenna diversity scheme achieves interference mitigation and conserves UBS while introducing bias into the navigation solution. Position bias may be acceptable in many civilian applications when the only alternative is to navigate without GPS.