Re:IPhone 4S has GLONASS in addition to GPS
by dfox on Wednesday October 19, 2011 @10:28AM
(#3130276)
There probably is some general statistical explanation of why you can get worse accuracy from combining multiple sources than each source by itself, but it seems irrelevant.
In actual receiver implementation you really get worse accuracy for simpler reason: most of the hardware resources (ie. receiver channels) are same between GPS and GLONASS, so using GLONASS ties up resources for GPS and vice versa.
Re:IPhone 4S has GLONASS in addition to GPS
by jrockway on Wednesday October 19, 2011 @07:17PM
(#3132578)
I don't think this is true. Most of the cheap GPS chips I see on sparkfun can track 60 satellites at once, and you're not going to be seeing that many at one time anyway.
In actual receiver implementation you really get worse accuracy for simpler reason: most of the hardware resources (ie. receiver channels) are same between GPS and GLONASS, so using GLONASS ties up resources for GPS and vice versa.