Radar level meter and method for processing signals thereof

A radar level meter and signal technology, applied in liquid/fluid solid measurement, engine lubrication, instruments, etc., can solve the problems of slow response output, slow update rate, unable to achieve data update speed, etc., to achieve low power consumption, The effect of high update rates

Inactive Publication Date: 2013-05-08
上海凡宜科技电子有限公司 +1
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  • Application Information

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Problems solved by technology

[0003] The known two-wire control (Two Wires Control, 4-20 mA transmission) of the radar level gauge has the disadvantage that the update rate is too slow
The known two-wire radar level gauge is limited by the high-energy excitation pulse wave requirements and the 4-20mA must be maintained at low power consumption requirements, and cannot achieve a fast data update speed. Therefore, for the position of the measured substance ( Level) response to changes in the output is slower

Method used

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  • Radar level meter and method for processing signals thereof
  • Radar level meter and method for processing signals thereof
  • Radar level meter and method for processing signals thereof

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Embodiment Construction

[0073] see figure 1 as shown, figure 1 It is a schematic diagram of the system architecture of the ranging radar device of the present invention, which includes:

[0074] A transmitter 10 is mainly composed of a phase-locked loop frequency synthesizer 11, a power amplifier 12, an adjustable attenuator 13, a frequency multiplier 14, etc.; wherein: the phase-locked loop frequency synthesizer 11 includes a lock The phase loop, a voltage-controlled oscillator and a digital frequency synthesis control circuit (not shown in the figure) are used to generate a sine wave transmission signal that can precisely control the digital modulation frequency; and the power amplifier 12 is used for signal amplification to increase the frequency of transmission. Signal strength; the adjustable attenuator 13 can attenuate the strength of the sending signal according to the needs of use; the frequency multiplier amplifier 14 is used to double the signal frequency and amplify its signal strength; ...

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Abstract

Disclosed are a radar level meter and a method for processing signals thereof. The radar level meter is provided with a micro control unit architecture, the architecture comprises a high-speed microprocessor, a low-speed microprocessor and a power charging and discharging circuit, and requirements on low power consumption and high update rate can be met. The method for processing the signals is a method for modulating the signals of the frequency-modulated continuous-wave radar level meter, and includes generating a high-frequency beat signal and feeding the high-frequency beat signal into a down-conversion mixer; converting the high-frequency signal into an intermediate-frequency periodic signal; converting the intermediate-frequency periodic signals into spectrum characteristics via fast Fourier transfer to obtain an FFT (fast Fourier transfer) signal; performing digital filtering transfer for the FFT signal for at least once to obtain final frequency characteristics; and finally acquiring the level distance by a physical value conversion program to obtain a high-precision distance relation.

Description

technical field [0001] The invention relates to a radar level gauge and a signal processing method thereof, in particular to a signal modulation method for a frequency modulation continuous wave (FMCW) radar level gauge. Background technique [0002] In Process Automation, the measurement of the substance content of solids, liquids or their mixtures is generally called Level Sensor. Radar level gauge is a kind of Level Sensor. The frequency of general radar level gauge is about 3GHz-80GHz. The radar level gauge usually transmits the signal (Transmitting Signal) through the antenna (Antenna), generally it can be a hole wave (Hone), a rod wave (Rod), a spherical wave (Spherical), a plane wave (planar type) and other direct non-contact Launched to the surface of the substance to be measured; it can also be connected to the target through a waveguide, such as rod, cable, wire or rope as signal conduction. [0003] The known two-wire control (Two Wires Control, 4-20 mA tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/284
Inventor 吴定国
Owner 上海凡宜科技电子有限公司
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