PRF Frequency Generator for a Fill Level Measuring Device

摘要

The invention relates to a frequency generator for generating two pulse repetition frequency signals with slightly different frequencies for a radar measuring device. The frequency generator comprises an oscillator, which generates an oscillator signal, a first signal path for generating a first pulse repetition frequency signal from the oscillator signal, and a second signal path for generating a second pulse repetition frequency signal from the oscillator signal. The first signal path comprises a frequency divider or a first DDS module which is designed to generate a first frequency signal on the basis of the oscillator signal, a first mixer which is designed to upmix the first frequency signal or a signal derived therefrom to an intermediate frequency band and to generate a first intermediate frequency signal, and a first ceramic bandpass filter which is designed to filter out a selected frequency component of the first intermediate frequency signal and to generate a bandpass-filtered first intermediate frequency signal. The second signal path comprises a second DDS component which is designed to generate a second frequency signal on the basis of the oscillator signal, said second frequency signal differing from the first frequency signal by a specified frequency offset, a second mixer which is designed to upmix the second frequency signal or a signal derived therefrom to an intermediate frequency band and to generate a second intermediate frequency signal, and a second ceramic bandpass filter which is designed to filter out a selected frequency component of the second intermediate frequency signal and to generate a bandpass-filtered second intermediate frequency signal.

主权项

1. Frequency generator for generating two pulse repetition frequency signals with slightly different frequencies for a radar measuring device that functions according to the pulse correlation principle, wherein the frequency generator has: an oscillator (400) that generates an oscillator signal, a first signal path for generating a first pulse repetition frequency signal from the oscillator signal, wherein the first signal path comprises:
a frequency divider (401) or a first DDS module, which is designed to generate a first frequency signal based upon the oscillator signal, a first mixer (403) that is designed to upmix the first frequency signal or a signal derived therefrom to an intermediate frequency band and to generate a first intermediate frequency signal, a first ceramic bandpass filter (405) that is designed to filter out a selected frequency component of the first intermediate frequency signal and to generate a first bandpass-filtered intermediate frequency signal, a second signal path for generating a second pulse repetition frequency signal from the oscillator signal, wherein the second signal path comprises: a second DDS module (408) that is designed to generate a second frequency signal based upon the oscillator signal, which second frequency signal differs from the first frequency signal by a specified frequency offset, a second mixer (410) that is designed to upmix the second frequency signal or a signal derived therefrom to an intermediate frequency band and to generate a second intermediate frequency signal, a second ceramic bandpass filter (411) that is designed to filter out a selected frequency component of the second intermediate frequency signal and to generate a second bandpass-filtered intermediate frequency signal.