An Advanced Digital Antenna Control Unit for GPS

J.I.R. Owen and M. Wells

Abstract:	The application of digital technology for anti jamming systems particularly adaptive antenna arrays for GPS provides many advantages compared with the traditional analogue solutions. These include significant improvements in the levels of cancellation particularly against broadband jammers, the capability to steer beams onto individual or group of satellites and a high operating speed required for manoeuvring vehicles. Other functions such as direction finding on the interference or jammer sources can be included. The UK Defence Evaluation and Research Agency in collaboration with Roke Manor Research, Raytheon Electronic Systems (UK) and Trimble Navigation have developed a digital adaptive array demonstrator for GPS. This paper describes the architecture of the demonstrator that has been built. The paper will describe the key aspects of the architecture. The RF design must be optimised to enable the digital signal processing. In the receiver channels the high jamming levels must be handled with very low spurious products and be matched for amplitude and phase. The broadband adaptive processing can be implemented in the time or frequency domain, each has advantages and disadvantages. Finally the integration of the adaptive array with the GPS receiver is examined for this case where beams are individually formed on each satellite.
Published in:	Proceedings of the 2001 National Technical Meeting of The Institute of Navigation January 22 - 24, 2001 Westin Long Beach Hotel Long Beach, CA
Pages:	402 - 407
Cite this article:	Owen, J.I.R., Wells, M., "An Advanced Digital Antenna Control Unit for GPS," Proceedings of the 2001 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2001, pp. 402-407.
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