Universal measurement data acquisition in water
In order to determine a level and the flow speed of a medium, FMCW transmission signals and CW transmission signals are emitted alternately. Using the Doppler effect, the flow speed of the medium can be determined from the reflected CW signal. The level is determined from the reflected FMCW signal.
1. A fill level measurement device for determining a distance from a medium and a flow speed of the medium by evaluating a transmission signal emitted by the fill level measurement device and reflected by the medium, comprising:
a signal generator module generating the transmission signal, which has an amplitude modulation or a frequency modulation during a first time interval and which has no modulation during a second time interval;
an antenna arrangement emitting the transmission signal in a first direction oblique to the flow direction of the medium; and
a processor unit determining the distance from the medium and the flow speed of the medium by evaluating the transmission signal reflected by the medium and received by the antenna arrangement,
wherein the antenna arrangement is configured to emit the transmission signal in a second direction which is perpendicular to the flow direction of the medium.
2. The fill level measuring device according to claim 1 , wherein the antenna arrangement is a single antenna having two or more radiation directions.
3. The fill level measuring device according to claim 1 , wherein the antenna arrangement comprises a first antenna and a second antenna, wherein the first antenna is configured to emit the transmission signal in the first direction and the second antenna is configured to emit the transmission signal in the second direction.
4. The fill level measurement device according to claim 3 , wherein the two antennas are both connected to the signal generator module via a directional coupler, a switch or a power splitter.
5. The fill level measurement device according to claim 1 , wherein the antenna arrangement comprises a planar antenna array.
6. The fill level measurement device according to claim 1 , wherein the signal generator module is an FMCW module, which generates the frequency-modulated transmission signal in the form of an FMCW signal during the first time interval, and which generates the unmodulated transmission signal in the form of a CW signal during the second time interval.
7. The fill level measurement device according to claim 6 , wherein the fill level measurement device is configured to transmit the transmission signal only in the first direction during the first time interval and to transmit the transmission signal only in the second direction during the second time interval.
8. The fill level measurement device according to claim 1 , wherein the processor unit is configured to determine the distance from the medium and the flow speed of the medium within a single measurement cycle.
9. The fill level measurement device according to claim 1 , wherein the fill level measuring device is a fill level radar.
10. The fill level measurement device according to claim 1 , wherein the fill level measuring device is a 2-wire line sensor.
11. A method for determining a distance from a medium and a flow speed of the medium by evaluating a transmission signal emitted by a measurement device and reflected by the medium, comprising:
generating a transmission signal which has an amplitude modulation or a frequency modulation during a first time interval and which has no modulation during a second time interval;
emitting the transmission signal in a first direction oblique to the flow direction of the medium; and
determining the distance from the medium and the flow speed of the medium by evaluating the transmission signal reflected by the medium and received by the antenna arrangement,
wherein the antenna arrangement is configured to emit the transmission signal in a second direction which is perpendicular to the flow direction of the medium.
12. A non-transitory computer-readable medium on which a program element is stored which, when executed on a processor unit of a fill level measurement device, causes the fill level measurement device to carry out the steps according to claim 11 .