Comment by labcomputer
5 hours ago
Err what?
No, conventional radio broadcasts can be received with a low noise amplifier and a tuned filter.
The received GPS signal, at ground level, is lower than the thermal noise floor. And the 1.023MHz code is modulated on the RF carrier anyway.
> and a tuned filter
So correlating it with a sine wavelet?
No? Old AM radio required only rectification. You can receive it with accidental diodes.
You do generally need a tuned filter before the rectification, unless you have an extremely large signal dominating the local airwaves.