Patent ID: 7880665
Filing Date: 2011-02-01
Classification: G01S,Y02A

Abstract:
1. In a weather radar system having a transmission source, a signal port for extracting a reference transmission signal from said transmission source and a receiver circuit for receiving reflectivity signals for processing, a transmission frequency fluctuation compensating circuit comprising: a. a stable local oscillator wherein said stable local oscillator is established at a single, non-fluctuating frequency; b. a mixer for mixing the output of said stable local oscillator with said received reflectivity signal to form an intermediate frequency reflectivity signal; c. a mixer for mixing the output of said stable local oscillator with the reference transmission signal to form an intermediate frequency transmission signal; d. an intermediate frequency digitizer for digitizing said intermediate frequency reflectivity signal and said intermediate frequency transmission signal; e. a signal processing module for converting said digitized intermediate frequency reflectivity signal into in phase and quadrature signals; and f. wherein said signal processing module includes a digital down converter circuit configured to alter said digitized intermediate frequency reflectivity signal to compensate for transmission signal frequency fluctuations.