Bit depth reduction for analog to digital conversion in global positioning system

A system for reducing a bit depth requirement for an A/D converter in a GPS (Global Positioning System) receiver having an antenna for receiving an analog input signal, said input signal having a GPS signal component and a jamming signal component, and a jam suppression processor for suppressing the jamming signal component, comprising:

• a filter/down-conversion module for filtering the received signal about a bandwidth B of a GPS code and centering about a center frequency f0 the frequency of the filtered signal;
• an automatic gain controller (AGC) for setting a set point of the down-converted signal;
• a noise generator for generating noise;
• an adder for adding the generated noise to the gain controlled signal;
• and
• an analog to digital (A/D) converter for converting the added noise signal to a digital signal,
• wherein the noise added to the gain controlled signal reduces the bit depth requirement of the A/D converter.