| 摘要 |
A self-diagnosing FMCW radar level gauge and a method for providing self- diagnosing with a radar level gauge is provided in a radar level gauge comprising a transceiver, a mixer,a signal propagating device and a signal propagation path connecting the transceiver and the signal propagating device,a filter arrangement and processing circuitry. The filter arrangement provides a filtered intermediate frequency signal. The transceiver outputs either a diagnostic sweep configured such that a reference echo from the signal propagation path is detectable in said filtered intermediate frequency signal, or a measurement sweep configured such that the reference echo is suppressed in the filtered intermediate frequency signal and that a surface echo is detectable. The processing circuitry is configured to self-diagnose the radar level gauge based on the reference echo, and to determine the distance to the surface based on the surface echo. |
