High sensitivity frequency modulated radar level gauge system
一种雷达物位计、频率变换器的技术，应用在无线电波测量系统、利用再辐射、液体/流体固体测量等方向，能够解决灵敏度达不到要求等问题，达到提高灵敏度、降低泄漏通道数、信号隔离降低的效果
Inactive Publication Date: 2011-05-04
ROSEMOUNT TANK RADAR
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[0007] Given the requirements of applications such as the examples above, currently available radar level gauge systems often fall short in terms of sensitivity
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[0035] In this specification, embodiments of the invention are described primarily with reference to a frequency modulated continuous wave (FMCW) type radar level gauge system having a single patch antenna for radiating and capturing electromagnetic signals. It should be noted that this in no way limits the scope of protection of the present invention, which also applies to other frequency-modulated radar level gauge systems, such as RLG systems in which pulses are modulated on a carrier wave for determining the fill level.
[0036] Furthermore, the radar level gauge system of the invention can be equipped with any other type of propagation device, such as horn antenna, whip antenna, array antenna, or probes, such as single-wire probes (including so-called Goubau probes), double-wire probes or a coaxial probe.
[0037] figure 1 It is a schematic diagram of a radar level gauge system 1 according to an embodiment of the present invention, including: a measuring electronic unit ...
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A radar level gauge system for determining a filling level of a product contained in a tank, comprising: a transceiver for generating, transmitting and receiving frequency-modulated electromagnetic signals; a transmitting propagating device electrically connected to the transceiver and arranged to propagate transmitted electromagnetic signals towards a surface of the product contained in the tank; and a receiving propagating device electrically connected to the transceiver and arranged to return echo signals resulting from reflections at impedance transitions encountered by the transmitted electromagnetic signals, including a surface echo signal resulting from reflection at the surface, back to the transceiver. A signal isolation between the transmitting propagating device and the receiving propagating device is at least 30dB, and the transceiver comprises: a signal generator for generating a frequency-modulated signal having a predetermined center frequency; a transmitter branch connecting an output of the signal generator with the transmitting propagating device via a first frequency converter for converting the frequency of the frequency-modulated signal to provide the transmitted electromagnetic signal; a receiver branch connected to the receiving propagating device for receiving the surface echo signal; and a mixer having a first input connected to the signal generator via a second frequency converter for converting the frequency of the frequency-modulated signal and a second input connected to the receiver branch, for forming an intermediate frequency signal indicative of a phase difference between the transmitted electromagnetic signal and the surface echo signal. The radar level gauge system further comprising processing circuitry connected to the transceiver for determining the filling level based on the intermediate frequency signal.
Description
technical field [0001] The present invention relates to frequency modulated radar level gauge systems. Background technique [0002] Currently, radar level gauge systems are used in various fields of application for the precise determination of filling levels. In order to determine the fill level of a product by means of a radar level gauge system, an electromagnetic signal is often emitted and propagated by means of an antenna to the product surface, where the signal is reflected by the product surface. The reflected signal is received by the radar level gauge system, and the transmitted signal is compared with the reflected signal when passing through to determine the distance between the reference position and the product surface. Based on this distance the filling level can be determined. [0003] Most radar level gauge systems on the market today are either based on the time difference between the transmission of a pulse and the reception of the reflection of that pul...
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IPC IPC(8): G01S13/34G01F23/284
CPCG01F23/284G01S7/038G01S13/34
Inventor A·吉思考格
Owner ROSEMOUNT TANK RADAR