초록 ▼

A GPS frequency converter is provided, according to the present invention, to down-convert the frequency of an incoming GPS signal. The converter includes first and second mixers, the former of which receives the incoming RF signal and a signal from a local oscillator. The local oscillator signal is

A GPS frequency converter is provided, according to the present invention, to down-convert the frequency of an incoming GPS signal. The converter includes first and second mixers, the former of which receives the incoming RF signal and a signal from a local oscillator. The local oscillator signal is increased by a factor of 98 and then subtracted from the incoming RF signal to produce a first intermediate frequency signal (IF). The first IF signal is then passed to the second mixer which subtracts the frequency of the local oscillator therefrom to produce a second intermediate frequency signal (IF). The second IF signal is passed through a limiter and output as the frequency converted signal.

대표청구항 ▼

[ What is claimed is:] [1.] A GPS frequency converter comprising:input means for receiving an input signal having an RF frequency and modulated by a code at a preset code rate, said RF frequency being greater than 1000 MHz;means for producing a first LO signal having a LO frequency, said LO frequenc

[ What is claimed is:] [1.] A GPS frequency converter comprising:input means for receiving an input signal having an RF frequency and modulated by a code at a preset code rate, said RF frequency being greater than 1000 MHz;means for producing a first LO signal having a LO frequency, said LO frequency being greater than said RF frequency by a non-zero multiple of a sampling rate, at which said input signal is sampled, plus or minus a non-zero multiple of said code rate; andfirst mixer means for receiving said input and first LO signals and for outputting a first intermediate signal having a first IF frequency equaling a difference between said LO and RF frequencies, said difference being less than 30 MHz.