Patent ID: 7508339

Claim:
An anti-jam system for use with a normal L1 Only Global Positioning System (GPS) receiver, comprising: a) a switchable L1/L2 RF downconverter for receiving L1 and L2 RF signals from an RF signal source and converting a selected one of said L1 or L2 RF signals to a low frequency analog signal; b) an analog-to-digital converter (ADC) for converting said low frequency analog signal to a digital signal; c) a digital anti-jam processor for processing said digital signal to enhance anti-jam performance; d) a digital-to-analog converter (DAC) for converting said processed digital signal to an enhanced analog signal; and, e) an RF upconverter for always converting said enhanced analog signal to an L1-based RF signal regardless as to whether said selected RF signal was an L1 or L2 RF signal, said L1-based RF signal for use by a normal L1 Only GPS receiver.