| 摘要 |
In fill-level measuring devices according to the pulse-transit-time method, a reflection that is generated internally in a microwave module is used as a reference for transit time measuring. For generating the reference pulse, the microwave module comprises its own sampling mixer or its own oscillator. Subsequently, the echo signal and the reference pulse can be further processed separately or together. No delay line is necessary on the transmission frequency of the radar sensor. Interference as a result of leakage signals is largely prevented.
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