The main motivation of this work is to introduce the criteria and to present an exemplary design of an acquisition aiding signal and to discuss the benefits of adding such a signal to the current GNSS baselines. First of all the main specifications that have to be satisfied by the design are identified, in order to improve the analyzed figures of merit and obtain the desired performance. Following the identified specifications and requirements, a design is proposed. The investigation starts from the spreading modulation and is followed by design of the navigation message. The aspects related to the message coding are discussed as well. Another essential problem is how the acquisition aiding signal can be transmitted with the legacy signal baseline. Also the issue of multiplexing is therefore discussed and analyzed. The design is realized by means of a trade-off of the identified specifications and solutions. The paper is closed with a comprehensive performance analysis of the newly defined signal acting together with the baseline signals. In particular the improved performance in terms of sensitivity and first position fix is highlighted. Also, a standard SDR receiver is used to process the obtained signals and to proof that the employed multiplexing algorithm are backward compatible with the legacy signal and receiver.

PAONNI Matteo;  BAVARO Michele;  ANGHILERI Marco;  EISSFELLER Bernd; 

2014-08-26

The Institute of Navigation

JRC86686

2331-5911,   

http://www.ion.org/publications/abstract.cfm?jp=p&articleID=11330,    https://publications.jrc.ec.europa.eu/repository/handle/JRC86686,