CN107884755A - A kind of method and analogue means that analog signal is provided for radar meter - Google Patents

A kind of method and analogue means that analog signal is provided for radar meter Download PDF

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Publication number
CN107884755A
CN107884755A CN201711082927.4A CN201711082927A CN107884755A CN 107884755 A CN107884755 A CN 107884755A CN 201711082927 A CN201711082927 A CN 201711082927A CN 107884755 A CN107884755 A CN 107884755A
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CN
China
Prior art keywords
frequency
signal
radar
frequency signal
unit
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CN201711082927.4A
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Chinese (zh)
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CN107884755B (en
Inventor
贾西平
卫延昌
曹妮妮
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Shenzhen Huayi Scientific Instrument Co Ltd
Guangdong Polytechnic Normal University
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Shenzhen Huayi Scientific Instrument Co Ltd
Guangdong Polytechnic Normal University
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Priority to CN201711082927.4A priority Critical patent/CN107884755B/en
Publication of CN107884755A publication Critical patent/CN107884755A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40Means for monitoring or calibrating
    • G01S7/4052Means for monitoring or calibrating by simulation of echoes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P21/00Testing or calibrating of apparatus or devices covered by the preceding groups
    • G01P21/02Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
    • G01P21/025Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers for measuring speed of fluids; for measuring speed of bodies relative to fluids
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40Means for monitoring or calibrating
    • G01S7/4052Means for monitoring or calibrating by simulation of echoes
    • G01S7/406Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention provides a kind of method and analogue means that analog signal is provided for radar meter.The analogue means includes:Radar wave Transmit-Receive Unit, for launching radar frequency signal and receiving the radar frequency signal reflected;Mixting circuit unit, for being carried out the frequency signal of the frequency signal launched from radar meter and radar wave Transmit-Receive Unit transmitting at mixing and exporting the difference frequency signal of the two frequency signals;Signal processing unit, for receiving the difference frequency signal and carrying out bandpass filtering and amplification to it;Constant-temperature crystal oscillator unit, for providing reference frequency signal;Frequency processing unit, for receiving the reference frequency signal and amplified difference frequency signal and the two signals being handled, obtain the frequency values of difference frequency signal;Input block, for inputting the velocity amplitude for the target for needing to simulate;Control unit, for calculating required expected frequency value, it is compared with the frequency values of the difference frequency signal from frequency processing unit and does respective handling.

Description

A kind of method and analogue means that analog signal is provided for radar meter
Technical field
The present invention relates to microwave electron technical field, and analog signal is provided for radar meter in particular to a kind of Method and analogue means.
Background technology
Current meter is that one kind aims at hydrologic monitoring, rivers flow monitoring, agricultural irrigation, municipal plumbing, trade effluent etc. The measuring instrumentss of industry open channel flow velocity measurement.It is common to have machinery, electrical measurement and ultrasonic three types.Mechanical type based on rotator type, There are rotary propeller type and cup-type current meter;Electrical measurement type has electromagnetic type current meter;Ultrasonic-type has time difference method and Doppler method current meter.But The instrument of above-mentioned three types will directly contact with current, therefore in extraodinary flood, flow measurement work is extremely difficult, so that warp High flow velocities data often are not detected, or even go back entail dangers to personal safety, have to approx measure river with buoy is launched sometimes Section surface flow velocity;And radar surveying flow velocity can then overcome above-mentioned disadvantage, therefore contactless radar flow velocity to a certain extent Instrument begins to be widely deployed out.
And researched and developed, in production process to radar current meter, essential link is to developing and giving birth to The flow velocity measurement accuracy of the radar current meter of production measures checking, it is therefore an objective to ensure that measurement accuracy meets design objective requirement, And examine whether current meter reaches the quality index requirement dispatched from the factory.Thus the rate of flow of fluid target of offer standard is needed with convection current Fast instrument is detected.
In order to simulate actual rate of flow of fluid, current way has following several:
1) the qualified coherent detection mechanism that the radar current meter sample developed or dispatched from the factory is taken to authorized by state is carried out Measurement checking, such mechanism typically have large-scale current meter identification tank;
2) strong Development and Production enterprise meeting designed, designed or customization produce the tank of water velocity, real by controlling The water velocity on border, the measurement object as radar current meter.
For the purpose for wanting quickly to launch the radar current meter product produced, the method for inspection of the above highlights Go out the drawbacks of a lot, such as:The way tested using the testing agency that radar current meter is taken to authorized by state qualification, is deposited It is costly, the cycle is long, can not solve batch production routine check requirement, also virtually extend new product in development Construction cycle, it is unfavorable for the competitiveness of product;And use self-control tank or guide rail band moving-target to move, to accomplish to simulate water body The precision of flow velocity in addition to system complex, is built and safeguarded, it is necessary to self-developing or customization is a set of is accurately controlled system Cost it is also very high, it is necessary to which special messenger safeguards and periodic calibration, this virtually improves product cost, too high research and development and generation into Originally it is unfavorable for the competition in market and like product.
The rate of flow of fluid of example from above can be not only measured using Doppler effect principle, can also be measured much The speed of mobile object, the radar in broad sense for being used to measure object speed based on the exploitation of Doppler effect principle are surveyed Fast instrument is equally faced with detected before product dispatches from the factory in development phase and manufacture to quality the problem of.
The content of the invention
It is an object of the invention to provide a kind of method and analogue means that analog signal is provided for radar meter, to change The problem of kind above-mentioned.
First embodiment of the invention provides a kind of analogue means that analog signal is provided for radar meter, and it includes:
Radar wave Transmit-Receive Unit, for launching radar frequency signal and receiving the radar frequency signal reflected;
Mixting circuit unit, radar frequency signal and the radar wave for will launch from the radar meter are received The radar frequency signal of bill member transmitting carries out Frequency mixing processing, and exports the difference frequency signal of the two frequency signals;
Signal processing unit, for receiving the difference frequency signal and bandpass filtering being carried out to it and amplifies and exports to frequency Rate processing unit;
Constant-temperature crystal oscillator unit, for providing reference frequency signal;
Frequency processing unit, for receiving the reference frequency signal and the amplified difference frequency signal and to the two Signal is handled, and is obtained the frequency values of difference frequency signal and is exported to control unit;
Input block, for inputting the velocity amplitude for the target motion for needing to simulate;
Control unit, for the calculation formula based on doppler frequency, according to required for being calculated the velocity amplitude of input Expected frequency value, the expected frequency value is compared with the frequency values of the difference frequency signal from frequency processing unit, if The two is identical, does not process;Closed if different according to the expected frequency value and the size of the frequency values of the difference frequency signal It is to send control signal to the radar wave Transmit-Receive Unit to change the frequency size of the radar wave signal of its transmitting.
Wherein, when the expected frequency value is more than the frequency values of the difference frequency signal, described control unit sends control letter Number give the radar wave Transmit-Receive Unit so that its launch higher frequency radar wave signal;Described in being less than when the expected frequency value The frequency values of difference frequency signal, described control unit sends control signal to the radar wave Transmit-Receive Unit so that it launches more low frequency The radar wave signal of rate.
Wherein, in addition to:Frequency reference unit, for send reference frequency signal to the radar wave Transmit-Receive Unit so as to Realize the self-calibrating to the analogue means.
Wherein, the radar meter is as detected outside radar meter.
Second embodiment of the invention provides one kind and provides analog signal using above-mentioned analogue means for radar meter Method, methods described includes:
Believed using the radar wave Transmit-Receive Unit of analogue means to obtain the radar wave frequency rate launched from the radar meter Number;
Using the mixting circuit unit of analogue means by the radar frequency signal from the radar meter with simulating The radar frequency signal of the radar wave Transmit-Receive Unit its own transmission of device carries out Frequency mixing processing, and provides the two frequency signals Difference frequency signal;
Bandpass filtering and enhanced processing are carried out to difference frequency signal this described using the signal processing unit of analogue means;
There is provided using the frequency processing unit of analogue means to the amplified difference frequency signal and by constant-temperature crystal oscillator unit Reference frequency signal handled to obtain the frequency values of the difference frequency signal;
The velocity amplitude that a target for needing to simulate is moved is inputted using the input block of analogue means;
Using the control unit of analogue means come the calculation formula based on doppler frequency, calculated according to the velocity amplitude of input Required expected frequency value is drawn, the frequency values of the expected frequency value and the difference frequency signal from frequency processing unit are carried out Compare, do not processed if the two is equal, the radar frequency signal that now the radar wave Transmit-Receive Unit is launched is exactly The radar frequency signal corresponding with the speed required for obtaining;According to the target frequency value and the difference if different The magnitude relationship of the frequency values of frequency signal come send control signal to the radar wave Transmit-Receive Unit with change its transmitting radar The frequency size of ripple signal, until the expected frequency value is equal with the frequency values of the difference frequency signal from frequency processing unit.
Wherein, when the expected frequency value is more than the frequency values of the difference frequency signal, described control unit sends control letter Number give the radar wave Transmit-Receive Unit so that its launch higher frequency radar wave signal;Described in being less than when the expected frequency value The frequency values of difference frequency signal, described control unit sends control signal to the radar wave Transmit-Receive Unit so that it launches more low frequency The radar wave signal of rate.
Wherein, also received including the use of the frequency reference unit of analogue means to send reference frequency signal to the radar wave Bill member is to realize the self-calibrating to the analogue means.
Wherein, the radar meter is as detected outside radar meter.
According to the method and analogue means that analog signal is provided for radar meter of the present invention, by receiving and handling quilt The radar frequency signal that the radar meter of detection is sent, for accurate radar corresponding to the goal pace calculating of target motion Frequency signal, the radar of the radar wave Transmit-Receive Unit transmitting of analogue means is controlled on the basis of the accurate radar frequency signal The size of frequency signal is so that the difference frequency signal obtained after processing is equal with the accurate radar frequency signal, thunder now Radar frequency signal up to the transmitting of ripple Transmit-Receive Unit can serve as the radar meter transmitting radar frequency signal extremely The analog signal for the radar frequency signal that target object back reflection is returned, using the analog signal can to radar meter Service behaviour detected.
Brief description of the drawings
Fig. 1 is the schematic block diagram of the device that analog signal is provided for radar meter of first embodiment of the invention;
Fig. 2 is the schematic block diagram of the device that analog signal is provided for radar meter of second embodiment of the invention.
Embodiment
Below in conjunction with the embodiment of the present invention and accompanying drawing, the technical scheme in the embodiment of the present invention is carried out clear, complete Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Generally herein The component of the embodiment of the present invention described and illustrated in place's accompanying drawing can be configured to arrange and design with a variety of.Therefore, The detailed description of the embodiments of the invention to providing in the accompanying drawings is not intended to limit the model of claimed invention below Enclose, but be merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not making The every other embodiment obtained on the premise of creative work, belongs to the scope of protection of the invention.
Below in conjunction with the drawings and specific embodiments of the present invention, technical scheme is carried out clearly and completely Description.
Fig. 1 is the schematic block diagram of the device that analog signal is provided for radar meter of the present invention.As shown in figure 1, this The device that analog signal is provided for radar meter of invention includes:Radar wave Transmit-Receive Unit, mixting circuit unit, signal transacting Unit, constant-temperature crystal oscillator unit, frequency processing unit, control unit and input block, wherein:
The radar wave Transmit-Receive Unit is used to launch radar frequency signal and receives the radar wave frequency rate letter reflected Number;
The mixting circuit unit is used for the radar frequency signal that will launch from the radar meter and the radar The radar frequency signal of ripple Transmit-Receive Unit transmitting carries out Frequency mixing processing, and exports the difference frequency signal of the two frequency signals;
The signal processing unit is used to receive the difference frequency signal and bandpass filtering is carried out to it and amplifies and will put Big difference frequency signal is exported to frequency processing unit;
The constant-temperature crystal oscillator unit is also referred to as constant-temperature crystal oscillator, for providing reference frequency signal;
The frequency processing unit is used to receive the reference frequency signal and the amplified difference frequency signal and to this Two signals are handled, and are obtained the frequency values of difference frequency signal and are exported to control unit;
The input block is used for the velocity amplitude for inputting the target motion for needing to simulate;
Described control unit is used for the calculation formula based on doppler frequency, according to needed for being calculated the velocity amplitude of input The expected frequency value wanted, the expected frequency value is compared with the frequency values of the difference frequency signal from frequency processing unit, such as Both fruits are identical, do not process;According to the expected frequency value and the size of the frequency values of the difference frequency signal if different Relation come send control signal to the radar wave Transmit-Receive Unit with change its transmitting radar wave signal frequency size.
Wherein, when the expected frequency value is more than the frequency values of the difference frequency signal, described control unit sends control letter Number give the radar wave Transmit-Receive Unit so that its launch higher frequency radar wave signal;Described in being less than when the expected frequency value The frequency values of difference frequency signal, described control unit sends control signal to the radar wave Transmit-Receive Unit so that it launches more low frequency The radar wave signal of rate.
When the radar frequency signal of radar wave Transmit-Receive Unit transmitting is adjusted to the difference of frequency processing unit transmission When the frequency values of frequency signal are equal with the expected frequency value being calculated, the radar wave frequency rate of the radar wave Transmit-Receive Unit transmitting Signal can send the radar wave frequency rate that radar frequency signal to target object back reflection is returned as the radar meter The analog signal of signal, now the translational speed of target object is the speed from the target object of input block input.
Herein, the work of the radar wave Transmit-Receive Unit and the mixting circuit unit is all the routine using this area Technological means, how grasp radar knowledge one skilled in the art that realize the radar wave Transmit-Receive Unit and described mixed Frequency circuit unit, including can commercially corresponding finished product.
The bandpass filtering and amplification that the signal processing unit performs also all are to use ordinary skill in the art means, example Bandpass filtering such as is performed using existing bandpass filter, designs basic amplifying circuit to realize signal amplification etc..
The constant-temperature crystal oscillator unit is also referred to as constant-temperature crystal oscillator, makes quartz crystal in crystal oscillator using thermostat The temperature of resonator keeps constant, will be changed as environment temperature caused by oscillator output frequencies variable quantity be cut to the crystalline substance of minimum Oscillation body device.The constant-temperature crystal oscillator of any model on the market, such as the constant-temperature crystal oscillator of Seiko Epson Corporation's production can be used.
The method that the frequency processing unit obtains the frequency values of difference frequency signal can use a variety of known methods, be situated between here Continue by approximatioss to obtain the frequency values of difference frequency signal.
Can be with the power of estimated frequency signal using Fourier transformation (Fast Fourier Transform (FFT) or discrete Fourier transform) Spectrum density valuation, and interested in actual applications is a very narrow frequency band range in whole frequency spectrum, improves narrow band signal Frequency discrimination thus target frequency, Ran Houtong can be estimated using the algorithm of Frequence zooming with the frequency of accurate measurement signal Cross with the difference comparsion of actual frequency to correct the target frequency of estimation, so can just be estimated by Frequence zooming, difference comparsion Go out the minimum target frequency value of error.It is that difference frequency signal is received by sample circuit in frequency processing unit, due to sampling The when base of circuit accurately and may not might have temperature drift, it is necessary to be obtained using the reference frequency of constant-temperature crystal oscillator offer to calculating very Target frequency value be corrected, using reference frequency come to be corrected the method for frequency that sampling obtains be the normal of this area Rule technology, is repeated no more here.
The input block can be keyboard, touch-screen etc., as long as the speed for the target motion for needing to simulate can be inputted The equipment of angle value.
Calculation formula of the described control unit based on doppler frequency, according to required for being calculated the velocity amplitude of input The method of expected frequency value is as follows:
The calculation formula of doppler frequency is
Wherein:
fD--- Doppler frequency is poor, corresponds to the radar wave frequency rate f of the radar meter transmitting in the present invention0And institute State the radar wave frequency rate f of analogue means transmitting1Difference;
f0--- the radar wave frequency rate of the radar meter transmitting;
f1--- the radar wave frequency rate of the analogue means transmitting;
V --- need the velocity amplitude of target motion simulated;
c0--- the light velocity;
Angle between the target of α --- motion and the line of radar meter and speed actual direction.
The velocity amplitude and setting angle α moved by the target of input, and the known radar meter transmitting Radar wave frequency rate, it is possible to the frequency values of desired difference frequency signal are calculated.
In the frequency values difference of the frequency values and the difference frequency signal from frequency processing unit of desired difference frequency signal, institute State control unit and send control signal to the radar wave Transmit-Receive Unit to change the frequency size of the radar wave signal of its transmitting. When the expected frequency value is more than the frequency values of the difference frequency signal, described control unit sends control signal to the radar wave Transmit-Receive Unit is so as to control the voltage of its transmitter unit to raise, so as to realize the radar wave signal of transmitting higher frequency;When described Expected frequency value is less than the frequency values of the difference frequency signal, and it is single to radar wave transmitting-receiving that described control unit sends control signal Member is so that controlling the voltage of its transmitter unit reduces, so as to realize the more low-frequency radar wave signal of transmitting.
In addition, the analogue means has also needed to self-calibrating function, thus the analogue means can also include:Frequency Reference unit, for sending reference frequency signal to the radar wave Transmit-Receive Unit to realize self school to the analogue means Standard, as shown in Fig. 2 the schematic frame of the device that analog signal is provided for radar meter of Fig. 2 second embodiment of the invention Figure.The process of self-calibrating is exactly the reference frequency signal for sending frequency reference unit when as the radar wave Transmit-Receive Unit The reflection echo frequency signal of reception, as stated above step be operated, realize self-calibrating and the detection of analogue means.
In addition, radar meter described here is as detected outside radar meter.
It is detected by receiving and handling according to the analogue means that analog signal is provided for radar meter of the present invention The radar frequency signal that radar meter is sent, for accurate radar wave frequency rate corresponding to the goal pace calculating of target motion Signal, the radar wave frequency rate of the radar wave Transmit-Receive Unit transmitting of analogue means is controlled on the basis of the accurate radar frequency signal The size of signal so that the difference frequency signal obtained after processing is equal with the accurate radar frequency signal, receive by radar wave now The radar frequency signal of bill member transmitting can serve as the radar meter and launch radar frequency signal to object The analog signal for the radar frequency signal that body back reflection is returned, use the work of the analog signal can to radar meter Performance is detected..
In addition, present invention also offers 3rd embodiment, which depict the worked of the analogue means with first embodiment The corresponding analogy method of journey.I.e. third embodiment of the invention additionally provides a kind of side that analog signal is provided for radar meter Method, it is come for thunder using the analogue means described by the combination of first embodiment above or first embodiment and preferred embodiment The method that analog signal is provided up to tachymeter, methods described include:
Believed using the radar wave Transmit-Receive Unit of analogue means to obtain the radar wave frequency rate launched from the radar meter Number;
Using the mixting circuit unit of analogue means by the radar frequency signal from the radar meter with simulating The radar frequency signal of the radar wave Transmit-Receive Unit its own transmission of device carries out Frequency mixing processing, and provides the two frequency signals Difference frequency signal;
Bandpass filtering and enhanced processing are carried out to difference frequency signal this described using the signal processing unit of analogue means;
There is provided using the frequency processing unit of analogue means to the amplified difference frequency signal and by constant-temperature crystal oscillator unit Reference frequency signal handled to obtain the frequency values of the difference frequency signal;
The velocity amplitude that a target for needing to simulate is moved is inputted using the input block of analogue means;
Using the control unit of analogue means come the calculation formula based on doppler frequency, calculated according to the velocity amplitude of input Required expected frequency value is drawn, the frequency values of the expected frequency value and the difference frequency signal from frequency processing unit are carried out Compare, do not processed if the two is equal, the radar frequency signal that now the radar wave Transmit-Receive Unit is launched is exactly The radar frequency signal corresponding with the speed required for obtaining;According to the target frequency value and the difference if different The magnitude relationship of the frequency values of frequency signal come send control signal to the radar wave Transmit-Receive Unit with change its transmitting radar The frequency size of ripple signal, until the expected frequency value is equal with the frequency values of the difference frequency signal from frequency processing unit, will The radar wave frequency rate that the radar frequency signal that the radar wave Transmit-Receive Unit is now launched is launched as the radar current meter Signal runs into the radar frequency signal that target reflects.
Wherein when the expected frequency value is more than the frequency values of the difference frequency signal, described control unit sends control signal To the radar wave Transmit-Receive Unit so that it launches the radar wave signal of higher frequency;When the expected frequency value is less than the difference The frequency values of frequency signal, described control unit sends control signal to the radar wave Transmit-Receive Unit so that it launches more low frequency Radar wave signal.
When the radar frequency signal of radar wave Transmit-Receive Unit transmitting is adjusted to the difference of frequency processing unit transmission When the frequency values of frequency signal are equal with the expected frequency value being calculated, the radar wave frequency rate of the radar wave Transmit-Receive Unit transmitting Signal can send the radar wave frequency rate that radar frequency signal to target object back reflection is returned as the radar meter The analog signal of signal, now the translational speed of target object is the speed from the target object of input block input.
Corresponding with the course of work of the analogue means of second embodiment, the method for providing analog signal is also wrapped Include:Reference frequency signal is sent to the radar wave Transmit-Receive Unit to realize pair using the frequency reference unit of analogue means The self-calibrating of the analogue means.The process of self-calibrating be exactly the reference frequency signal for sending frequency reference unit work as The reflection echo frequency signal that the radar wave Transmit-Receive Unit receives, as stated above step be operated, realize analogue means Self-calibrating and detection.
Wherein described radar meter is as detected outside radar meter.
Described in the 3rd embodiment for radar meter provide analog signal method be used first embodiment or Analogue means described by the combination of first embodiment and preferred embodiment provides the method and step of analog signal, here every The implementation of one step all be use analogue means in relevant work unit, therefore first embodiment description operation principle, Step and process are equally applicable to this.Equally, operation principle, step and the process of second embodiment description are equally applicable to this.
According to the method that analog signal is provided for radar meter of the present invention, by receiving and handling detected radar The radar frequency signal that tachymeter is sent, for accurate radar wave frequency rate letter corresponding to the goal pace calculating of target motion Number, control the radar wave frequency rate of the radar wave Transmit-Receive Unit transmitting of analogue means to believe on the basis of the accurate radar frequency signal Number size so that the difference frequency signal obtained after processing is equal with the accurate radar frequency signal, radar wave transmitting-receiving now The radar frequency signal of unit transmitting can serve as the radar meter and launch radar frequency signal to target object The analog signal for the radar frequency signal that back reflection is returned, the workability using the analog signal can to radar meter It can be detected.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (8)

1. a kind of analogue means that analog signal is provided for radar meter, it includes:
Radar wave Transmit-Receive Unit, for launching radar frequency signal and receiving the radar frequency signal reflected;
Mixting circuit unit, it is single for the radar frequency signal that will launch from the radar meter and radar wave transmitting-receiving The radar frequency signal of member transmitting carries out Frequency mixing processing, and exports the difference frequency signal of the two frequency signals;
Signal processing unit, for receiving the difference frequency signal and bandpass filtering being carried out to it and amplifies and exports to frequency Manage unit;
Constant-temperature crystal oscillator unit, for providing reference frequency signal;
Frequency processing unit, for receiving the reference frequency signal and the amplified difference frequency signal and to the two signals Handled, obtain the frequency values of difference frequency signal and export to control unit;
Input block, for inputting the velocity amplitude for the target motion for needing to simulate;
Control unit, for the calculation formula based on doppler frequency, the required phase is calculated according to the velocity amplitude of input Frequency values are hoped, the expected frequency value is compared with the frequency values of the difference frequency signal from frequency processing unit, if the two It is identical, do not process;If different according to the expected frequency value and the magnitude relationship of the frequency values of the difference frequency signal come Control signal is sent to the radar wave Transmit-Receive Unit to change the frequency size of the radar wave signal of its transmitting.
2. analogue means according to claim 1, wherein when the expected frequency value is more than the frequency of the difference frequency signal Value, described control unit sends control signal to the radar wave Transmit-Receive Unit so that it launches the radar wave letter of higher frequency Number;When the expected frequency value is less than the frequency values of the difference frequency signal, described control unit sends control signal to the thunder Up to ripple Transmit-Receive Unit so that it launches more low-frequency radar wave signal.
3. analogue means according to claim 1, it also includes:Frequency reference unit, for sending reference frequency signal To the radar wave Transmit-Receive Unit to realize the self-calibrating to the analogue means.
4. analogue means according to claim 1, wherein the radar meter is as detected outside radar survey Fast instrument.
5. a kind of use provides the side of analog signal for radar meter according to one of the claim 1-3 analogue means Method, methods described include:
The radar frequency signal launched from the radar meter is obtained using the radar wave Transmit-Receive Unit of analogue means;
Using the mixting circuit unit of analogue means by radar frequency signal and analogue means from the radar meter The radar frequency signal of radar wave Transmit-Receive Unit its own transmission carry out Frequency mixing processing, and provide the difference of the two frequency signals Frequency signal;
Bandpass filtering and enhanced processing are carried out to difference frequency signal this described using the signal processing unit of analogue means;
Using the frequency processing unit of analogue means to the amplified difference frequency signal and the base provided by constant-temperature crystal oscillator unit Quasi- frequency signal is handled to obtain the frequency values of the difference frequency signal;
The velocity amplitude that a target for needing to simulate is moved is inputted using the input block of analogue means;
Using the control unit of analogue means come the calculation formula based on doppler frequency, it is calculated according to the velocity amplitude of input Required expected frequency value, the expected frequency value and the frequency values of the difference frequency signal from frequency processing unit are compared It is right, do not processed if the two is equal, the radar frequency signal that now the radar wave Transmit-Receive Unit is launched be exactly with Obtain the corresponding radar frequency signal of required speed;According to the target frequency value and the difference frequency if different The magnitude relationship of the frequency values of signal come send control signal to the radar wave Transmit-Receive Unit with change its transmitting radar wave The frequency size of signal, until the expected frequency value is equal with the frequency values of the difference frequency signal from frequency processing unit.
6. according to the method for claim 5, wherein when the expected frequency value is more than the frequency values of the difference frequency signal, institute State control unit and send control signal to the radar wave Transmit-Receive Unit so that it launches the radar wave signal of higher frequency;Work as institute The frequency values that expected frequency value is less than the difference frequency signal are stated, described control unit sends control signal and received and dispatched to the radar wave Unit is so that it launches more low-frequency radar wave signal.
7. according to the method for claim 5, also send reference frequency including the use of the frequency reference unit of analogue means Signal gives the radar wave Transmit-Receive Unit to realize the self-calibrating to the analogue means.
8. according to the method for claim 5, wherein the radar meter is as detected outside radar meter.
CN201711082927.4A 2017-11-07 2017-11-07 Method and simulation device for providing simulation signal for radar velocimeter Active CN107884755B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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CN109001723A (en) * 2018-06-29 2018-12-14 薛志勇 Radar current meter
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