Processor for a passive ranger
OwnerDaniel E. Fisherinventor
Life of this patent
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Abstract
A receiver includes an RF bridge and a processor coupled to the RF bridge to receive an information signal from the RF bridge. The processor includes a clock source and a processor front end. The processor front end includes first and second frequency sources, a processor down converter and an analog to digital converter. The first frequency source generates a reference signal based on a signal from the clock source. The reference signal is coupled to the RF bridge. The second frequency source generates a first local oscillator signal based on the signal from the clock source. The processor down converter heterodynes the first local oscillator signal and the information signal. The analog to digital converter is coupled to the processor down converter and provides a digitized down converted signal.
Claims25
A receiver comprising an RF bridge and a processor coupled to the RF bridge to receive an information signal from the RF bridge, the processor including a clock source and a processor front end, the processor front end comprising:
- a first frequency source operable to generate a reference signal at a predetermined reference frequency based on a signal from the clock source, the reference signal being coupled to the RF bridge, the RF bridge being operable to provide the information signal at the predetermined reference frequency with a frequency difference modulated thereon, the frequency difference being a difference between frequencies of first and second RF signals received at respective first and second antennas;
- a second frequency source operable to generate a first local oscillator signal based on the signal from the clock source;
- a processor down converter operable to heterodyne the first local oscillator signal and the information signal;
- and
- an analog to digital converter coupled to the processor down converter and operable to provide a digitized down converted signal.
A method comprising:
- generating a reference signal at a predetermined reference frequency based on a signal from a clock source, the reference signal being coupled to an RF bridge;
- generating an information signal in the RF bridge at the predetermined reference frequency with a frequency difference modulated thereon, the frequency difference being a difference between frequencies of first and second RF signals received at respective first and second antennas;
- generating a first local oscillator signal based on the signal from the clock source;
- heterodyning the first local oscillator signal and the information signal to provide a heterodyned signal;
- and
- sampling the heterodyned signal in an analog to digital converter to provide a digitized down converted signal.
A receiver comprising an RF bridge and a processor coupled to the RF bridge to receive an information signal from the RF bridge, the processor including a digital clock source and a processor front end, the processor front end comprising:
- a first frequency source operable to generate a reference signal based on a signal from the digital clock source, the reference signal being coupled to the RF bridge;
- a second frequency source operable to generate a first local oscillator signal based on the signal from the digital clock source;
- a processor down converter operable to heterodyne the first local oscillator signal and the information signal;
- and
- an analog to digital converter coupled to the processor down converter and operable to provide a digitized down converted signal at a sample rate derived from the digital clock source.
Dependencies are inferred from the claim text.