Simultaneous GPS or S-GPS is a method to enhance a mobile phone's satellite-based position reporting ability.
Ordinarily, a built-in, multi- dimensional GPS device 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. 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. The commercial availability of S-GPS chipsets from manufacturers such as Qualcomm, has led to adoption of the method in newer handsets.
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- 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: 107–110. doi:10.1109/CICC.2007.4405692. ISBN 978-1-4244-0786-6. Retrieved 18 June 2016.
- "Improving S-GPS sensitivity". Avago Technologies. Archived from the original on 2012-08-13.
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