Multipath Mitigation Techniques for GPS

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-04-M-1673
Agency Tracking Number: F041-234-1590
Amount: $99,993.00
Phase: Phase I
Program: SBIR
Awards Year: 2004
Solicitation Year: 2004
Solicitation Topic Code: AF04-234
Solicitation Number: 2004.1
Small Business Information
SIGTEM TECHNOLOGY, INC.
113 Clover Hill Lane, Harleysville, PA, 19438
DUNS: 869012732
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Chun Yang
 Principal Scientist
 (215) 513-9477
 chunyang@sigtem.com
Business Contact
 Chun Yang
Title: President
Phone: (215) 513-9477
Email: chunyang@sigtem.com
Research Institution
N/A
Abstract
We propose to develop two unconventional techniques to estimate multipath signals and to mitigate their effects on GPS code and carrier measurement accuracy. These two techniques can be applied separately and/or in combination to individual GPS signals and/or to several GPS signals jointly. The first technique will make use of a dual circularly polarized antenna from which the RHCP signal will be used for normal operation while the LHCP signal is for multipath estimation. With a slight increase in hardware, the multipath signals can be strengthened by 10dB. This is significant to obtain more accurate estimation of closely spaced multipath signals. The second technique will estimate the multipath parameters in the frequency domain. This frequency-domain formulation is equivalent to the time-domain deconvolution but it transforms the problem of estimation with nonlinear functional equations in the time domain into one with linear parametric equations in the frequency domain, thus greatly facilitating the solution process. In Phase I, the proposed system concept will be refined and the enabling algorithms developed. We will perform a preliminary design of hardware subsystems and characterize the algorithms performance by means of analytic study and numerical simulation. In Phase II, the recommended architecture and the validated algorithms will be implemented in a breadboard prototype for demonstration.

* information listed above is at the time of submission.

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