Radar Level Meter and Its Signal Processing Method

A radar level meter and signal technology, which is applied in liquid/fluid solid measurement, engine lubrication, instruments, etc., can solve problems such as slow update rate, slow response output, and failure to achieve data update speed, achieving high-speed update rate, The effect of low power consumption

Inactive Publication Date: 2016-08-03
上海凡宜科技电子有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The known two-wire control (TwoWiresControl, 4-20mA 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 low power consumption requirements of 4-20mA, and cannot achieve 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 Its Signal Processing Method
  • Radar Level Meter and Its Signal Processing Method
  • Radar Level Meter and Its Signal Processing Method

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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 (ProcessAutomation), it is generally known as a level sensor (LevelSensor) for measuring the content of solids, liquids or their mixtures. The radar level gauge is a kind of level sensor (LevelSensor). The general radar level meter uses a frequency of about 3GHz-80GHz. The radar level gauge usually transmits the signal (TransmittingSignal) through the antenna (Antenna), generally it can be a hole wave (Hone), a rod wave (Rod), a spherical wave (Spherical), a plane wave (planartype) and so on. The surface of the substance to be measured; it can also be through a waveguide (Waveguide), such as a rod wave (rod), a cable wave (cable), a wire or a rope wave (wireorrope), and the point where the target is conne...

Claims

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Application Information

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Patent Type & Authority Patents(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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