Re:Lockheed is now tracking phones and walkie-talkies from s...
by 1letterunixname on Saturday November 18, 2023 @04:19PM
(#38324574)
Civilian GPS receivers are passive reception devices.
> Cellular signal from a personal cellphone isn't strong enough to register at satellite altitude.
This isn't entirely true. A primary limiting factor is the frequency-specific gain of satellites' antenna arrays. With a big enough antenna and fast and sensitive enough ADCs, much more is possible. Sifting through TD-SCDMA is the fun part.
> Cellular signal from a personal cellphone isn't strong enough to register at satellite altitude.
This isn't entirely true. A primary limiting factor is the frequency-specific gain of satellites' antenna arrays. With a big enough antenna and fast and sensitive enough ADCs, much more is possible. Sifting through TD-SCDMA is the fun part.