| 主权项 |
1. A radar level gauge for determine a distance to a surface of a product in a tank, said radar level gauge comprising:
transceiver circuitry configured to transmit an electromagnetic transmit signal and receive an electromagnetic return signal reflected from said surface, said transceiver circuitry comprising a frequency stabilizing feedback loop configured to generate said electromagnetic transmit signal in the form of a frequency sweep, wherein said frequency stabilizing feedback loop is intentionally configured to generate an oscillation, causing a modulation of said frequency sweep, a signal propagation device arranged to guide said transmit signal towards said surface, and to guide said return signal to said transceiver circuitry, a first mixer configured to mix said transmit signal and said return signal to provide a first intermediate frequency signal, a second mixer configured to mix said intermediate frequency signal with a signal having a frequency which is an integer multiple of the frequency of said modulation to provide a second intermediate frequency signal, and processing circuitry configured to determine said distance based on said second intermediate frequency signal. |
