4 ms·
There are two frequencies (sometimes three) transmitted by the satellites. Using two frequencies allows certain atmospheric delays to be accurately estimated. T
by salty_biscuits 5y ago
There are two frequencies (sometimes three) transmitted by the satellites. Using two frequencies allows certain atmospheric delays to be accurately estimated. Trouble is only one code is available for civilian applications. The trick with two receivers is to solve for the phase of secret signal (rather than decode it) by solving an integer least squares problem. This allows accuracy of the order of +/- 5cm
- myself248 5y agoThere are multiple civilian frequencies available now, and cheap receivers for 'em. I have a pair of F9P's running at present, and just received some GT-U12's for testing.
- sorenjan 5y agoMobile phones use dual frequencies now. Some use the Broadcom BCM47755 chip, but the most common ones are various Qualcomm Snapdragon SoCs. https://www.broadcom.com/products/wireless/gnss-gps-socs/bcm47755 https://www.broadcom.com/products/wireless/gnss-gps-socs/bcm... https://www.euspa.europa.eu/newsroom/news/qualcomm-launches-snapdragon-dual-frequency-and-5g https://www.euspa.europa.eu/newsroom/news/qualcomm-launches-... https://www.gpsworld.com/qualcomm-launches-3-dual-frequency-navic-smartphone-modules/ https://www.gpsworld.com/qualcomm-launches-3-dual-frequency-...