Engineering:S-GPS
Simultaneous GPS or S-GPS is a method to allow a GPS reception and CDMA communications to operate simultaneously in a mobile phone. Ordinarily, cellular geolocation and a built-in GPS receiver is used to determine the location of an E911 call made from CDMA phones. By using a time-multiplexed scheme called TM-GPS, the reception of the telephone call and the GPS signal are alternated one after the other, requiring only one radio receiver.
Simultaneous GPS allows a cellphone to receive both GPS and voice data at the same time, which improves sensitivity and allows service providers to offer location-based services.[1] The use of two radios with a single antenna imparts new design challenges, such as leakage of the voice transmitter signal into the GPS receiver circuitry.[2] The commercial availability of S-GPS chipsets from manufacturers such as Qualcomm, has led to adoption of the method in newer handsets.[3]
See also
References
- ↑ Milette, Greg; Stroud, Adam (2012-05-18) (in en). Professional Android Sensor Programming. John Wiley & Sons. p. 6. ISBN 9781118240458. https://books.google.com/books?id=dZjo-254FucC&dq=%22simultaneous+GPS%22&pg=PA5.
- ↑ Xu, Y.; Wang, K.; Pals, T.; Hadjichristos, A.; Sahota, K.; Persico, C. (1 September 2007). "A Low-IF CMOS Simultaneous GPS Receiver Integrated in a Multimode Transceiver". 2007 IEEE Custom Integrated Circuits Conference. pp. 107–110. doi:10.1109/CICC.2007.4405692. ISBN 978-1-4244-0786-6.
- ↑ "Improving S-GPS sensitivity". Avago Technologies. Archived from the original on 2012-07-22. https://web.archive.org/web/20120722093231/http://www2.electronicproducts.com/Improving_S_GPS_sensitivity-article-farr_avago_jun2008-html.aspx.
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