GPS Trackers, Real-Time GPS Tracking Devices
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Once you understand the processing gain of each part of the receiver, it is a small step to understand how to increase that gain and thus increase the sensitivity of the receiver. However, even if you are not designing a receiver, it is still important to understand the relationship between the signal strength at the antenna and the correlation response. This is because the measure of a high-sensitivity receiver is its ability to acquire and track weak signals. The only way to know how weak the signals actually are, in practice, is for the receiver to tell you, and the way the receiver knows is by back-calculating the signal strength from the measured height of the correlation response. The receiver has no way of directly measuring the signal at the antenna or in the front end. Only after the receiver has created the correlation response does it have a measure of what the signal at the antenna was.
Moreover, there is no such thing as a separate signal-strength meter that you can plug into a GPS antenna to measure the strength of the signals. The GPS receiver is the signal strength meter.
The problem of building high-sensitivity receivers and measuring how good they are is analogous to building a fast car and measuring how fast it is going with the speedometer. The carmaker also builds the speedometer. The speedometer actually measures how fast the wheels are turning. Only if the manufacturer correctly calibrates the rotation rate of the wheels to the diameter of the inflated tire will the speed reading actually be correct.