Transdigitizer for relaying signals from global positioning system (GPS) satellites
First Claim
1. A transdigitizer for receiving, downconverting and relaying signals from a satellite to a receiving station, said transdigitizer comprising:
- a first antenna receiving and relaying said signals from said satellite;
a radio frequency means receiving said signals from said first antenna, said radio frequency means filtering and amplifying said signal, said radio frequency means outputting a filtered signal;
a converter means receiving and converting said filtered signal from said radio frequency means into an intermediate frequency signal;
an intermediate frequency means receiving, filtering and amplifying said intermediate frequency signal from said converted means, said intermediate frequency means outputting a filtered intermediate frequency signal;
a downconverter means receiving and downconverting said intermediate frequency signal into a base band frequency signal;
transmitter means receiving said base band frequency signal from said downconverter means and transmitting a transmit signal to said receiving station; and
a frequency control means coordinating said receiving, downconverting and relaying of signals by said transdigitizer by sending;
a first clocking signal to said converter means, a second clocking signal to said intermediate frequency means, a third clocking signal to said downconverter means, and fourth and fifth clocking signals to said transmitter means.
1 Assignment
0 Petitions
Accused Products
Abstract
The reception, downconversion and retransmission of the 1575.42 MHz Global Positioning System (GPS) satellite signal is accomplished by the following. First, an RF stage comprising of an antenna, filter and preamplifier receiver, filters and amplifies the 1575.42 MHz signals. Following the RF stage, a converter stage, consisting of a bandpass filter, converts the GPS signal to a lower frequency. Then, an Intermediate Frequency (IF), comprising an IF amplifier, multiplier, bandpass filter and limiter further amplifies and filters the signals to remove the effects of the signals. A final downconverter converts the signal to a base band frequency and in a zero crossing detector the signal is amplified and 1 bit quantized. Finally, a local oscillator controls a frequency synthesizer to latch the signal from the zero crossing detector in a flip flop, which in turn is used to control a quadraphase monitor, whose signals are amplified and transmitted out the transmit antenna.
-
Citations
6 Claims
-
1. A transdigitizer for receiving, downconverting and relaying signals from a satellite to a receiving station, said transdigitizer comprising:
-
a first antenna receiving and relaying said signals from said satellite; a radio frequency means receiving said signals from said first antenna, said radio frequency means filtering and amplifying said signal, said radio frequency means outputting a filtered signal; a converter means receiving and converting said filtered signal from said radio frequency means into an intermediate frequency signal; an intermediate frequency means receiving, filtering and amplifying said intermediate frequency signal from said converted means, said intermediate frequency means outputting a filtered intermediate frequency signal; a downconverter means receiving and downconverting said intermediate frequency signal into a base band frequency signal; transmitter means receiving said base band frequency signal from said downconverter means and transmitting a transmit signal to said receiving station; and a frequency control means coordinating said receiving, downconverting and relaying of signals by said transdigitizer by sending;
a first clocking signal to said converter means, a second clocking signal to said intermediate frequency means, a third clocking signal to said downconverter means, and fourth and fifth clocking signals to said transmitter means. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification