GPS Principles
I am studying for the Navigation ATPL and I am curious about some aspects of GPS principles.
The reader I have says that the GPS signal is weaker than the radio background noise. Knowing what to look for, the receiver can find the signal amongst the noise. This makes the antennae smaller than otherwise.
I am wondering;
why make the signal psuedo-random?
Is it for security?
So if you dont know what youre looking for, you wont find it?
Why is the same principle not applied to other satcomms (making all dishes smaller) ?
Thanks for any discussion