| 主权项 |
1. A radar level gauge system for determining a filling level of a product in a tank, comprising:
a signal propagation device arranged to propagate an electromagnetic transmit signal towards a surface of the product and to return an electromagnetic reflection signal resulting from reflection of the electromagnetic transmit signal at impedance discontinuities encountered by said transmit signal; transmitter circuitry coupled to said signal propagation device and configured to generate and transmit said transmit signal during a measurement cycle; receiver circuitry coupled to said signal propagation device and configured to receive said reflection signal during said measurement cycle, said receiver circuitry comprising: a first receiver branch configured to transform said reflection signal to a digital first measurement signal being indicative of a phase relation between the transmit signal and the reflection signal received during said measurement cycle, the first measurement signal being amplitude-modulated according to a first gain function in relation to said reflection signal; and a second receiver branch configured to transform said reflection signal to a digital second measurement signal being indicative of a phase relation between the transmit signal and the reflection signal received during said measurement cycle, the second measurement signal being amplitude-modulated according to a second gain function, different from said first gain function, in relation to said reflection signal; and processing circuitry coupled to said first receiver branch and said second receiver branch, and configured to determine said filling level based on said first measurement signal and said second measurement signal. |
