CN104568057B - A kind of echo-signal adjusting method and device suitable for guided wave radar - Google Patents
A kind of echo-signal adjusting method and device suitable for guided wave radar Download PDFInfo
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- CN104568057B CN104568057B CN201410848800.9A CN201410848800A CN104568057B CN 104568057 B CN104568057 B CN 104568057B CN 201410848800 A CN201410848800 A CN 201410848800A CN 104568057 B CN104568057 B CN 104568057B
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Abstract
The present invention provides a kind of echo-signal adjusting method and device suitable for guided wave radar, wherein, the method acquires echo amplitude signal, and judge whether the amplitude of the echo amplitude signal is in preset range, the output that digital analog converter and digital regulation resistance are adjusted with this, to make echo-signal be maintained at a zone of reasonableness;In addition, device includes mainly signal amplifier, reference voltage source, digital analog converter, digital regulation resistance and control module, for acquiring the echo amplitude signal through signal amplifier amplification output, and judge whether the amplitude of echo amplitude signal is in preset range:The output that digital analog converter and digital regulation resistance are adjusted with this to make echo-signal be maintained at a zone of reasonableness, and is calculated level distance according to echo amplitude signal and is exported.The present invention makes the echo-signal of acquisition remain at one convenient in the amplitude narrow range of acquisition and processing, guided wave radar being allowed to can adapt to a variety of different work condition environments.
Description
Technical field
The present invention relates to industrial automation, it is primarily related to the guided wave radar for measuring controlling level in tank body
Level meter, more specifically for, more particularly, to a kind of echo-signal adjusting method and device suitable for guided wave radar.
Background technology
Guided wave radar material level gauge is the instrument for measuring height of materials, is usually installed in and needs to measure height of materials
Tank body top, guided wave radar material level gauge is launched electromagnetic impulse by guided wave bar, when electromagnetic wave encounters measured object
After matter, portion of energy is then reflected back, and the time difference by calculating electromagnetic radiation pulse and return pulse can be obtained object
The distance for expecting level meter reference plane can calculate the height of material further according to relevant parameters such as tank body height.
Since measured matter dielectric constant is different, distance is different, and the rangeability of echo-signal generally reaches tens
A dB.Measuring Dielectric Constant is smaller, distance level farther out when, echo-signal is minimum;Measuring Dielectric Constant is larger, distance
When closer, echo-signal is again very big.Guided wave radar material level gauge in engineer application at present, due to being limited by system power dissipation, usually
Using the amplifying circuit of several groups of different gains, processor is according to the size of collected echo-signal, dynamically in several groups of amplifications
Switch between circuit.It is adjusted when echo-signal is larger and arrives smaller amplification factor, echo-signal is adjusted to larger hour and put
Big multiple so that within the scope of the amplitude of echo-signal is in one convenient for late-class circuit detection, be unlikely to excessive or too small.
The range that conference exceeds amplitude detection is crossed, it is too small can not to detect echo-signal.
But in practical applications, between being typically included in 1.5 to 80 due to measured matter dielectric constant, measurement distance packet
It includes between 1 meter to 70 meters, considers further that some Test Cycles are in metal can, echo reflection is relatively large, some measurements are
In open space environment, echo reflection is relatively small, and the dynamic range of echo is very big.In summary factor measures electricity
Road can preset amplification factor, but single amplification factor is difficult to meet gamut model in measurement process according to current working parameter
The measurement enclosed needs the amplifying circuit for switching different gains in measurement process, is put being switched to another grade by level-one amplifying circuit
When big circuit, the saltus step that signal amplitude can be caused larger, microprocessor needs largely to analyze it and confirm to ensure
Collected echo-signal is effectively reliable.
In summary factor can not fully meet the needs of practical application using the method for multigroup amplifying circuit.
Invention content
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of echoes suitable for guided wave radar
Signal Regulation method and device can not fully meet reality using the method for multigroup amplifying circuit in the prior art for solving
The problem of needs of application.
In order to achieve the above objects and other related objects, the present invention provides following technical scheme:
One
A kind of echo-signal adjusting method suitable for guided wave radar, including:Acquire echo amplitude signal;Judge the echo
Whether the amplitude of range signal is in preset range:If it is not, then adjusting digital analog converter with until platform voltage amplitude is in pre-
If range, and digital regulation resistance is adjusted in turn with until the echo amplitude signal is made to be in preset range, and exported;If
It is then to receive the echo amplitude signal and level distance value is calculated according to the echo amplitude signal, and exported.
Secondly
A kind of echo-signal regulating device suitable for guided wave radar, including:Signal amplifier, for receiving echo amplitude letter
Number and exported after being amplified to it;Reference voltage source, for generating a reference voltage and being exported;Digital-to-analogue conversion
Device is connected to the reference voltage source and amplifier, for generating an adjustable reference voltage according to the reference voltage, and
It is exported;Digital regulation resistance connects the amplifier, for adjusting output variable resistance;Control module is connected to
The signal amplifier, digital analog converter and digital regulation resistance, for acquiring the echo through signal amplifier amplification output
Range signal, and judge whether the amplitude of the echo amplitude signal is in preset range:If it is not, then adjusting digital analog converter institute
The reference voltage amplitude of output adjusts the variable resistance that digital regulation resistance is exported with until described in turn to preset range
Echo amplitude signal is in preset range;If so, level distance is calculated according to the echo amplitude signal and gives defeated
Go out.
In above-mentioned second scheme, microprocessor acquires echo-signal, according to echo signal amplitude size, changes number
Potentiometer resistance value, and then change amplifying circuit amplification factor, so that echo-signal is amplified to an amplitude model convenient for detection
Enclose, will not exceed measuring range due to too big, will not be difficult to detect because of too small, but remain at one be convenient for it is micro-
On the amplitude of processor acquisition and processing is narrow.
As described above, the invention has the advantages that:The present invention is by analyzing echo-signal, then right
Digital regulation resistance and digital analog converter are adjusted, and export continuously adjustable reference voltage and resistance value, are put to change signal
The amplification factor of big device, to make acquired echo-signal remain at a narrow model of amplitude convenient for acquisition and processing
It places, to adapt to a variety of different work condition environments.
Description of the drawings
Fig. 1 is shown as the flow chart that the present invention is suitable for the echo-signal adjusting method of guided wave radar.
Fig. 2 is shown as adjusting digital analog converter with until platform voltage amplitude is in the method flow diagram of preset range.
Fig. 3 is shown as adjusting digital regulation resistance with until the method flow for making the echo amplitude signal be in preset range
Figure.
Fig. 4 is shown as a kind of schematic diagram of echo-signal regulating device suitable for guided wave radar of the invention.
Drawing reference numeral explanation
S10-S2022 method and steps
Specific implementation mode
Illustrate that embodiments of the present invention, those skilled in the art can be by this explanations by particular specific embodiment below
Content disclosed by book understands other advantages and effect of the present invention easily.
Embodiment one
See Fig. 1, shows a kind of flow chart of echo-signal adjusting method suitable for guided wave radar provided by the invention, such as
Shown in figure, the echo-signal adjusting method suitable for guided wave radar includes the following steps:
Step S10 acquires echo amplitude signal;
Step S20, judges whether the amplitude of the echo amplitude signal is in preset range:
Step S201, if it is not, then adjusting digital analog converter until platform voltage amplitude is in preset range, and to adjust in turn
Section digital regulation resistance is exported with until the echo amplitude signal is made to be in preset range;
Step S202, if so, receiving the echo amplitude signal and object being calculated according to the echo amplitude signal
Position distance value, and exported.
Above-mentioned echo-signal adjusting method changes digital regulation resistance resistance value, Jin Ergai according to echo signal amplitude size
Become amplifying circuit amplification factor, echo-signal is made to be amplified to an amplitude range convenient for detection, will not exceed due to too big
Measuring range will not be difficult to detect because of too small, but it is narrow to remain at an amplitude convenient for acquisition and processing
On.
Further, Fig. 2 is seen, to adjust digital analog converter with until platform voltage amplitude is in the method stream of preset range
Cheng Tu, as shown, in the step S201, the adjusting digital analog converter is with until platform voltage amplitude is in default model
The specific method step enclosed includes:
Step S201a acquires echo bracket signal;
Step S201b, judges whether the platform voltage amplitude of the echo bracket signal is in preset zone of reasonableness:If
It is no, then digital analog converter is adjusted to adjust exported reference voltage value to zone of reasonableness by control module, and return to step
S201a;Digital regulation resistance step is adjusted if so, entering.
Further, Fig. 3 is seen, to adjust digital regulation resistance with until the echo amplitude signal is made to be in preset range
Method flow diagram, in the step S201, the adjusting digital regulation resistance is with until make the echo amplitude signal be in pre-
If the specific method step of range includes:
Step S202a acquires echo amplitude signal;
Step S201b, judges whether the signal amplitude of the echo amplitude signal is in preset zone of reasonableness:If it is not,
Digital regulation resistance is then adjusted to adjust the echo amplitude signal to preset range by control module, and return to step S202a;
If so, calculating material position step into control module.
Embodiment two
Further, see Fig. 4, the present invention also provides a kind of echo-signal regulating devices suitable for guided wave radar, including:
Signal amplifier, for receiving echo amplitude signal and being exported after being amplified to it;Reference voltage source, for generating one
Reference voltage is simultaneously exported;Digital analog converter is connected to the reference voltage source and amplifier, for according to benchmark electricity
Pressure generates an adjustable reference voltage, and is exported;Digital regulation resistance connects the amplifier, can for adjusting output
Variable resistive value;Control module is connected to the signal amplifier, digital analog converter and digital regulation resistance, for acquiring warp
The echo amplitude signal of the signal amplifier amplification output, and judge the amplitude of the echo amplitude signal whether in default
Range:If it is not, then adjusting reference voltage amplitude that digital analog converter is exported to preset range, and digital regulation resistance is adjusted in turn
The variable resistance exported is with until the echo amplitude signal is in preset range;If so, according to the echo amplitude
Signal is calculated level distance and is exported.
Specifically, the signal amplifier selects low input bias current, offset current and the track to track of temperature drift fortune
It calculates amplifier and establishes amplifying circuit;The reference voltage source selects temperature drift down to the reference voltage source of 15ppm to digital analog converter
Reference voltage is provided;The digital analog converter selects one 16 digital analog converters to press parameter preset output reference voltage;Number
Word potentiometer selects one 8 digital regulation resistances to generate resistance group of the resistance with temperature drift down to 15ppm by parameter preset
At the feedback of amplifying circuit.
Further, the control module is microprocessor (MCU), and microprocessor is big according to echo-signal bracket signal
It is small, the code of digital analog converter output is adjusted, and then change adjustable reference voltage value, the bracket signal for adjusting echo-signal arrives
OK range.
In above-described embodiment two, microprocessor acquires echo-signal, according to echo signal amplitude size, changes number electricity
Potentiometer resistance value, and then change amplifying circuit amplification factor, so that echo-signal is amplified to an amplitude range convenient for detection,
Will not exceed measuring range due to too big, will not be difficult to detect because of too small, but remain at one convenient for micro- place
On the amplitude of the acquisition of reason device and processing is narrow.
In conclusion the present invention is by analyzing echo-signal, then to digital regulation resistance and digital analog converter
Be adjusted, export continuously adjustable reference voltage and resistance value, to change the amplification factor of signal amplifier, to making or
The echo-signal of acquisition remains at one and is convenient in the amplitude narrow range of acquisition and processing, to adapt to a variety of different works
Condition environment.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology can all carry out modifications and changes to above-described embodiment without violating the spirit and scope of the present invention.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should by the present invention claim be covered.
Claims (8)
1. a kind of echo-signal adjusting method suitable for guided wave radar, which is characterized in that including:
Acquire echo amplitude signal;
Judge whether the amplitude of the echo amplitude signal is in preset range:
If it is not, then adjusting digital analog converter until platform voltage amplitude is in preset range, and to adjust digital regulation resistance in turn
With until the echo amplitude signal is made to be in preset range, and exported;If so, receiving the echo amplitude signal simultaneously
Level distance value is calculated according to the echo amplitude signal, and is exported;
Wherein, the digital analog converter that adjusts is with until the specific method that platform voltage amplitude is in preset range includes:
Acquire echo bracket signal;
Judge whether the platform voltage amplitude of the echo bracket signal is in preset zone of reasonableness:If it is not, then passing through control
Module adjusts digital analog converter to adjust exported reference voltage value to zone of reasonableness, and returns to the acquisition echo platform letter
Number step;Digital regulation resistance step is adjusted if so, entering;And
The digital regulation resistance that adjusts is with until the specific method for making the echo amplitude signal be in preset range includes:
Acquire echo amplitude signal;
Judge whether the signal amplitude of the echo amplitude signal is in preset zone of reasonableness:If it is not, then passing through control module
Digital regulation resistance is adjusted to adjust the echo amplitude signal to preset range, and returns to the acquisition echo amplitude signal step
Suddenly;If so, calculating material position step into control module.
2. a kind of echo-signal regulating device suitable for guided wave radar, which is characterized in that including:
Signal amplifier, for receiving echo amplitude signal and being exported after being amplified to it;
Reference voltage source, for generating a reference voltage and being exported;
Digital analog converter is connected to the reference voltage source and amplifier, for adjustable according to reference voltage generation one
Reference voltage, and exported;
Digital regulation resistance connects the amplifier, for adjusting output variable resistance;
Control module is connected to the signal amplifier, digital analog converter and digital regulation resistance, for acquiring through the letter
The echo amplitude signal of number amplifier amplification output, and judge whether the amplitude of the echo amplitude signal is in preset range:
If it is not, reference voltage amplitude that digital analog converter is exported then is adjusted to preset range, and it is defeated to adjust digital regulation resistance institute in turn
The variable resistance gone out is with until the echo amplitude signal is in preset range;If so, according to the echo amplitude signal
Level distance is calculated and is exported.
3. the echo-signal regulating device according to claim 2 suitable for guided wave radar, which is characterized in that the control mould
Block for adjust digital analog converter with until platform voltage amplitude be in preset range when, be additionally operable to acquire echo bracket signal,
And judge whether the platform voltage amplitude of the echo bracket signal is in preset zone of reasonableness:If it is not, then by controlling mould
Block adjusts digital analog converter to adjust exported reference voltage value to zone of reasonableness, and returns to the acquisition echo bracket signal
Step;Digital regulation resistance step is adjusted if so, entering.
4. the echo-signal regulating device according to claim 2 suitable for guided wave radar, which is characterized in that the control mould
Block is for adjusting digital regulation resistance until when the echo amplitude signal being made to be in preset range, to be additionally operable to acquisition echo amplitude
Signal, and judge whether the signal amplitude of the echo amplitude signal is in preset zone of reasonableness:If it is not, then by controlling mould
Block adjusts digital regulation resistance to adjust the echo amplitude signal to preset range, and returns to the acquisition echo amplitude signal step
Suddenly;If so, calculating material position step into control module.
5. the echo-signal regulating device according to claim 2 suitable for guided wave radar, which is characterized in that the control mould
Block is microprocessor.
6. the echo-signal regulating device according to claim 2 suitable for guided wave radar, which is characterized in that the signal is put
Big device is track to track operational amplifier.
7. the echo-signal regulating device according to claim 2 suitable for guided wave radar, which is characterized in that the benchmark electricity
Potential source is reference voltage source of the temperature drift down to 15ppm.
8. the echo-signal regulating device according to claim 2 suitable for guided wave radar, which is characterized in that the digital-to-analogue turns
The digital analog converter that parallel operation is 16, the digital regulation resistance that the digital regulation resistance is 8.
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CN105974387B (en) * | 2016-05-13 | 2019-08-13 | 中国科学院电子学研究所 | A kind of signal gain control method and device |
CN107817484B (en) * | 2016-09-12 | 2020-04-28 | 北京万集科技股份有限公司 | Amplification factor processing method and device of laser radar amplification circuit |
CN108225482A (en) * | 2016-12-15 | 2018-06-29 | 重庆川仪自动化股份有限公司 | Suitable for the gain-adaptive adjusting method and system of guided wave radar |
WO2021056332A1 (en) * | 2019-09-26 | 2021-04-01 | 深圳市速腾聚创科技有限公司 | Laser radar signal processing method and apparatus, and computer device and storage medium |
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