4 ms·
If the wavelength at 700Mhz is 43cm, wouldn't this have to track the position of the phone to within ~5-10cm to get a benefit? Or at least relative distance be
by cookingrobot 13y ago
If the wavelength at 700Mhz is 43cm, wouldn't this have to track the position of the phone to within ~5-10cm to get a benefit? Or at least relative distance between antennas.
- lutusp 13y agoThe present cell system can locate a cell device within the same limits using time delay and phase detection of the received signal (this requires three antennas for a 2D fix). Many cell phones that claim to have GPS actually rely on the cell network to locate them, and the location method is reasonably accurate. That means the system already knows where each device is located using the same wavelength constraints required to make this idea work. Link: http://en.wikipedia.org/wiki/Mobile_phone_tracking http://en.wikipedia.org/wiki/Mobile_phone_tracking Quote: "Mobile phone tracking refers to the attaining of the current position of a mobile phone, stationary or moving. Localization may occur either via multilateration of radio signals between (several) radio towers of the network and the phone, or simply via GPS."