Proposed NAV Data Signal Design for Optimal TTFF in a Single Frequency IRNSS Receiver

Vyasaraj Guru Rao, Sumadhva B Pappu, Gerard Lachapelle

Abstract:	India is planning to deploy an autonomous regional satellite based navigation system to cover its territorial footprint and surrounding areas. The purpose of this system as any other existing GNSS is to cater to the needs of both specific users (Precision Service (PS)) and civilian users (Standard Positioning Service (SPS)). The overall constellation consists of seven satellites, of which three will be in geostationary and four in geosynchronous orbits. This system will be used for surveying, telecommunication, transport, identifying disaster locations and public safety, along with a host of other applications (Vyasaraj et al 2011). Time To First Fix (TTFF) is an important parameter used to assess a receiver’s performance. As a part of this research, attempt is made to understand this component in detail, namely its effect in various types of receivers and associated limitations. Subsequently, an optimal NAV data transmission method is deduced for single frequency application. A hardware simulator developed to generate this signal is described. To test this proposed signal, new receiver software is developed. Finally, the test methodology and the results are presented.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	2956 - 2967
Cite this article:	Rao, Vyasaraj Guru, Pappu, Sumadhva B, Lachapelle, Gerard, "Proposed NAV Data Signal Design for Optimal TTFF in a Single Frequency IRNSS Receiver," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 2956-2967.
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