CN108957407A - A kind of narrow pulse signal production method - Google Patents
A kind of narrow pulse signal production method Download PDFInfo
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- CN108957407A CN108957407A CN201810876579.6A CN201810876579A CN108957407A CN 108957407 A CN108957407 A CN 108957407A CN 201810876579 A CN201810876579 A CN 201810876579A CN 108957407 A CN108957407 A CN 108957407A
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- pulse signal
- dac
- narrow pulse
- data
- analogue conversion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/01—Details
- H03K3/017—Adjustment of width or dutycycle of pulses
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention provides a kind of narrow pulse signal production methods, belong to digit pulse and generate design field.The method includes being first depending on demand of the radar system to narrow pulse signal width parameter, and practical digital-to-analogue conversion rate and conversion bit wide according to specifically used DAC chip, the narrow pulse waveform of required several pulsewidths is quantified, every kind of waveform takes the data of a cycle；Later by the storage unit of the data input control circuit of quantization, and pass through DAC circuit and carry out digital-to-analogue conversion, exports narrow pulse signal.The invention is used to generate the narrow pulse signal of radar, and the generation of the narrow pulse signal of ps magnitude may be implemented, and pulse width can be flexibly adjustable according to application needs, and pulsewidth can all be realized from ps magnitude to millisecond magnitude.
Description
Technical field
The invention belongs to digit pulses to generate design field, and in particular to a kind of narrow pulse signal production method.
Background technique
With the continuous expansion of radar application occasion, demand of the user to radar function is in many-sided, synthesization trend,
Thus radar integration and function it is integrated be Radar Technology development one of direction.Such as by Ground Penetrating Radar and ground mapping radar
Function integration, makees integrated design.Ground mapping radar needs the pulse-modulated signal of big time width, big bandwidth, and Ground Penetrating Radar
The pulse-modulated signal of extremely narrow time width is needed, therefore the precondition for integrating both radar functions is when wanting to realize big simultaneously
Wide, bandwidth signal and extremely narrow time width pulse-modulated signal, traditional method are produced respectively using two sets of complete different circuits
Raw above-mentioned signal.Big time width, no further details to be given herein for bandwidth signal production method, the generation of bandwidth signals when introducing extremely narrow
Method.Common burst pulse production method has following several:
1, it is realized using Digital Logic programming device, can be convenient based on programmable logic device, flexibly realizes arteries and veins
The generation of signal is rushed, the usually most narrow generation that 2ns or so burst pulse may be implemented, the disadvantages of the method are as follows being limited to Digital Logic
The width of its pulse of the operating rate of device can only accomplish ns magnitude；
2, narrow pulse signal is generated using the switching characteristic of semiconductor devices, most narrow spaces can accomplish ps magnitude, no
Foot place is that this method is not flexible, and pulse width is determined by device parameters, specifies component, then the width of pulse is just
Depending on therewith, it can not change；
3, it also can produce burst pulse using the avalanche characteristic of bipolar transistor, most narrow spaces can also accomplish ps amount
Grade, disadvantage is the same as method 2.
As radar visits being increasing for ground functional mode, original several ways are no longer able to satisfy application demand, need
The flexible adjustable burst pulse producing method of a kind of pulse width, to support existing radar to visit the expansion of ground function.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of new method, the generation of narrow pulse signal, pulse are realized
Width can be flexibly adjustable from ps magnitude to ns magnitude, and has and implement feature simple, low in cost.
Narrow pulse signal production method of the present invention, mainly comprises the steps that
Step 1 obtains demand of the radar system to narrow pulse signal width parameter；
Step 2 is chosen with specific digital-to-analogue conversion frequency fDACDAC circuit, the selection of the specific digital-to-analogue conversion frequency
Pulsewidth including the narrow pulse signal of demand can be covered by the corresponding pulse width realized of the specific digital-to-analogue conversion frequency；
The cycle T of the narrow pulse signal of step 3, acquisition radar system demand；
Step 4, in any a cycle, determine quantized data number be T*fDAC；
Step 5, by the T*fDACM continuous data in a data is dimensioned to 1~A, wherein A is to choose
The amplitude peak that DAC circuit can generate, remainder data are set to 0；
Step 6, according to the multiple waveforms of radar system demand, according to above-mentioned steps by the corresponding difference of the multiple waveforms
The data of pulsewidth, different cycles and different amplitudes are quantified；
Step 7, will be in the internal storage unit of the data write control circuit after quantization；
Step 8, according to radar system demand, select corresponding waveform, and by corresponding T*fDACA data send DAC to
Circuit completes digital-to-analogue conversion by DAC circuit and exports the narrow pulse signal.
Preferably, the burst pulse that demand can be covered by the corresponding pulse width realized of specific digital-to-analogue conversion frequency
The 80% of all pulsewidths of signal.
It preferably, include M times of specific digital-to-analogue conversion frequency by the corresponding pulse width realized of specific digital-to-analogue conversion frequency
The inverse of rate, wherein M is positive integer.
Preferably, in the step 2, the DAC circuit with specific digital-to-analogue conversion frequency is chosen, including the specific of selection
Digital-to-analogue conversion frequency is reciprocal M times of most narrow spaces in the pulse signal of radar system demand, wherein M is positive integer.
Preferably, in steps of 5, the amplitude peak A=2 that the DAC circuit generatesN-S- 1, wherein N is to choose
The digital-to-analogue conversion bit wide of DAC circuit, when DAC data format is signed number type, S takes 1, otherwise takes 0.
Preferably, in steps of 5, by the T*fDACM continuous data in a data is dimensioned to A.
Key point of the invention is to quantify narrow pulse signal, then quantized result is stored in depositing inside control circuit
In reservoir, high-speed DAC circuit is then transferred data to by high-speed bus circulation, digital-to-analogue conversion is completed by high-speed DAC, i.e., it is complete
At the generation of narrow pulse signal.
The present invention most narrow pulse width determines by the conversion rate of DAC, the DAC chip highest conversion rate of commercialization at present
The pulse signal that pulsewidth is less than 170ps may be implemented at present more than 6GHz, thus using this method, in the future as DAC chip number
The promotion of mould conversion rate can produce more burst pulse using this method accordingly.And the pulse for needing to increase output signal is wide
Degree, it is only necessary to which the number for increasing the corresponding quantized data of high level can.The invention is used to generate the narrow pulse signal of radar,
It is integrated in the original big time width of radar, in big bandwidth signal generation device, it is no increase any additional circuit element and
In the case where hardware cost, chip only is written by quantized data, by the data of quantization, and control and choose suitable quantized data
It is exported by DAC digital-to-analogue conversion, it can realize the generation of the narrow pulse signal of ps magnitude, pulse width can be needed according to application
Flexibly adjustable, pulsewidth can all be realized from ps magnitude to millisecond magnitude.
Detailed description of the invention
Fig. 1 is the circuit connection diagram according to a preferred embodiment of narrow pulse signal production method of the present invention.
Wherein, 1 is clock circuit, and 2 be control circuit, and 3 be DAC circuit, and 4 be parallel-to-serial converter.
Specific embodiment
To keep the purposes, technical schemes and advantages of the invention implemented clearer, below in conjunction in the embodiment of the present invention
Attached drawing, technical solution in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or class
As label indicate same or similar element or element with the same or similar functions.Described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to use
It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.Under
Face is described in detail the embodiment of the present invention in conjunction with attached drawing.
The present invention is integrated in the original big time width of radar, in big bandwidth signal generation device, does not increase any additional
Circuit element and hardware cost, the understanding for convenience of those skilled in the art to embodiment of the present invention are now original by radar
Big time width, big bandwidth signal generation device briefly describe.
As shown in Figure 1, signal generation device includes clock circuit 1, control circuit 2, DAC circuit 3 and parallel-to-serial converter
4.In being described below, the corresponding interface of each module is indicated using module+interface label, such as a of clock circuit 1 connects
Mouthful, it is indicated using 1a.
With reference to Fig. 1, the control circuit output terminal of clock 1a of clock circuit 1 is connected to the input end of clock 2a of control circuit 2,
The DAC output terminal of clock 1b of clock circuit 1 is connected to the input end of clock 3b of DAC circuit 3, and the SPI of control circuit 2 controls signal
Output end 2c is connected to the SPI control signal input 3c of DAC circuit 3, the DAC input data clock output end of control circuit 2
2d is connected to the DAC input data clock input terminal 3d of DAC circuit 3, and the fast output terminal of clock 2g of control circuit 2 is connected to and goes here and there
The fast input end of clock 4a of converter 4, the slow clock that the slow output terminal of clock 2h of control circuit 2 is connected to parallel-to-serial converter 4 are defeated
Enter and hold 4b, the parallel data output end 2b of control circuit 2 is connected to the parallel data input terminal 4c of parallel-to-serial converter 4, and goes here and there and turn
The data output end 4d of parallel operation 4 is connected to 3 data input pin 3g of DAC circuit, the DAC output data output terminal of clock of DAC circuit 3
3e is connected to the DAC output data input end of clock 2e of control circuit 2, and the reset signal output end 2f of control circuit 2 is connected to
The reset signal input terminal 3f of DAC circuit 3, the analog signal output 3a of DAC circuit 3 are final signal output end.
The present invention slightly improves the control circuit of above-mentioned signal generation device, which adapts to complete step of the present invention
8 function, including corresponding data transmission is completed into digital-to-analogue conversion to DAC circuit, clock control and control DAC circuit and exports institute
State the functions such as narrow pulse signal.Technical solution of the present invention is described in detail below.
Based on the connection relationship between foregoing circuit and circuit devcie, narrow pulse signal production method of the present invention is main to wrap
It includes:
Step 1 obtains demand of the radar system to narrow pulse signal width parameter.
In the present embodiment, the narrow pulse signal of radar system demand includes the signal that pulse width W is 0.5ns, and pulse is wide
Spend the signal for being 1.0ns, the signal that pulse width is 1.25ns, pulse width is the signal etc. of 1.5ns, which is mainly
The pulse width of acquisition demand.
Step 2 is chosen with specific digital-to-analogue conversion frequency fDACDAC circuit, the selection of the specific digital-to-analogue conversion frequency
Pulsewidth including the narrow pulse signal of demand can be covered by the corresponding pulse width realized of the specific digital-to-analogue conversion frequency.
In the present embodiment, such as choose digital-to-analogue conversion frequency fDACFor the DAC circuit of 800~2500MHz, therefrom specifies and turn
Frequency is changed so that the signal for covering above-mentioned pulse width can be generated, it is to be understood that digital-to-analogue conversion frequency and narrow pulse width
Relationship be W=M/fDAC, wherein M is positive integer, depending on pulsewidth size, such as above-mentioned specified digital-to-analogue conversion frequency
fDACThe pulse signal of 0.5ns is generated then when M is 1 for 2G, when M is 2, generates the pulse signal of 1.0ns.
It should be noted that for the pulse signal of all pulse widths of the present embodiment can be generated, it may be necessary to higher number
The DAC circuit or the adjustable clock circuit of digital-to-analogue conversion rate dynamic of mould conversion frequency.Such as 0.5ns pulse signal and
The DAC circuit of 4G digital-to-analogue conversion frequency can be used in the pulse signal of 1.25ns, as a result, when M is 2, generates the arteries and veins of 0.5ns
Signal is rushed, when M is 5, generates the pulse signal of 1.25ns；Or it can dynamically be adjusted in DAC digital-to-analogue conversion speed range
The f of clock generation circuit outputDACFrequency, when generate 0.5 pulse signal when, fDACIt is adjusted to 2GHz, M is 1, and is worked as
When generating the pulse signal of 1.25ns, fDACIt is adjusted to 800MHz, M is still 1 at this time.
Since in state of the art, there are digital-to-analogue conversion upper frequency limits for DAC circuit, it is all that covering can not be fully achieved
Pulse signal, at this point, adjustable f in practical applicationsDACAnd M value, a pulsewidth is designed as close possible to desired letter
Number.In alternate embodiment, the corresponding digital-to-analogue conversion frequency of most narrow spaces demand, such as above-mentioned selection 0.5ns can also be chosen
The corresponding 2G digital-to-analogue conversion frequency of pulse width signal selects the DAC circuit of respective model accordingly.
The cycle T of the narrow pulse signal of step 3, acquisition radar system demand.
It is understood that the period of different pulses may be different, the present embodiment is by taking a cycle as an example, it is assumed that needs
The signal to be generated is pulsewidth 1.5ns, period 5000ns, the digital-to-analogue conversion frequency f chosen as a result,DACFor 2G, M 3.
Step 4, in any a cycle, determine quantized data number be T*fDAC。
In the present embodiment, determining quantized data number is 5000 × 2=10000.
Step 5, by the T*fDACM continuous data in a data is dimensioned to 1~A, wherein A is to choose
The amplitude peak that DAC circuit can generate, remainder data are set to 0.
In the present embodiment, in above-mentioned 10000 data, chooses 3 continuous size of data and be set as 1~A, such as this
Three continuous data are A, and remainder data is dimensioned to 0.Thus corresponding radar wave is just generated after DAC digital-to-analogue conversion
Shape.
In the present embodiment, the amplitude peak A=2 of the DAC circuit generationN-S- 1, wherein N is the DAC circuit chosen
Digital-to-analogue conversion bit wide, generally 14 or 16, when DAC data format is signed number type, S takes 1, otherwise takes 0.Example
Such as, when DAC data format is signed number type, then T*fDACHave M consecutive numbers in a data is dimensioned to 2N-1-1；
And when DAC data format is unsigned number type, then T*fDACHaving M consecutive numbers in a data is 2N-1。
Step 6, according to the multiple waveforms of radar system demand, according to above-mentioned steps by the corresponding difference of the multiple waveforms
The data of pulsewidth, different cycles and different amplitudes are quantified.
Step 7 controls the data after quantization together with others in the internal storage units of program write control circuits, it
Afterwards, it is powered on to circuit, powers on rear control circuit under the driving of clock, completed to the initial of the reset of DAC chip and SPI interface
Change.
Step 8, according to radar system (host computer) demand, select corresponding waveform, control circuit circulation is by corresponding T*
fDACA data send DAC circuit to, complete digital-to-analogue conversion by DAC circuit and export the narrow pulse signal.
The present invention most narrow pulse width determines by the conversion rate of DAC, the DAC chip highest conversion rate of commercialization at present
Close to 6GHz, thus the pulsewidth of nearly 160ps may be implemented in use this method at present, in the future as DAC chip digital-to-analogue conversion rate
Promotion, can produce more burst pulse accordingly using this method.And need to increase the pulse width of output signal, it is only necessary to increase
Increase the number of the corresponding quantized data of level.The invention is used to generate the narrow pulse signal of radar, is integrated in radar
In original big time width, big bandwidth signal generation device, in no feelings for increasing any additional circuit element and hardware cost
Under condition, chip only is written by quantized data, by the data of quantization, and controls the suitable quantized data of selection and passes through DAC digital-to-analogue
Conversion output, it can realize the generation of the narrow pulse signal of ps magnitude, pulse width can be flexibly adjustable according to application needs,
Pulsewidth can all be realized from ps magnitude to millisecond magnitude.
Finally it is noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, those skilled in the art should understand that: it is still
It is possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equally replaced
It changes；And these are modified or replaceed, the essence for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution
Mind and range.
Claims (6)
1. a kind of narrow pulse signal production method characterized by comprising
Step 1 obtains demand of the radar system to narrow pulse signal width parameter；
Step 2 is chosen with specific digital-to-analogue conversion frequency fDACDAC circuit, the selection of the specific digital-to-analogue conversion frequency includes
The pulsewidth of the narrow pulse signal of demand can be covered by the corresponding pulse width realized of the specific digital-to-analogue conversion frequency；
The cycle T of the narrow pulse signal of step 3, acquisition radar system demand；
Step 4, in any a cycle, determine quantized data number be T*fDAC；
Step 5, by the T*fDACM continuous data in a data is dimensioned to 1~A, wherein A is the DAC chosen
The amplitude peak that circuit can generate, remainder data are set to 0；
Step 6, according to the multiple waveforms of radar system demand, according to above-mentioned steps by the corresponding different arteries and veins of the multiple waveforms
The data of wide, different cycles and different amplitudes are quantified；
Step 7, will be in the internal storage unit of the data write control circuit after quantization；
Step 8, according to radar system demand, select corresponding waveform, and by corresponding T*fDACA data send DAC circuit to,
Digital-to-analogue conversion is completed by DAC circuit and exports the narrow pulse signal.
2. narrow pulse signal production method as described in claim 1, which is characterized in that described by certain number in the step 2
The corresponding pulse width realized of mould conversion frequency can cover the 80% of all pulsewidths of the narrow pulse signal of demand.
3. narrow pulse signal production method as claimed in claim 2, which is characterized in that corresponding real by specific digital-to-analogue conversion frequency
Existing pulse width includes the inverse of M times of specific digital-to-analogue conversion frequency, wherein M is positive integer.
4. narrow pulse signal production method as described in claim 1, which is characterized in that in the step 2, choose with specific
The DAC circuit of digital-to-analogue conversion frequency, the specific digital-to-analogue conversion frequency including selection be radar system demand pulse signal in most
Reciprocal M times of narrow spaces, wherein M is positive integer.
5. narrow pulse signal production method as described in claim 1, which is characterized in that in steps of 5, the DAC circuit produces
Raw amplitude peak A=2N-S- 1, wherein N is the digital-to-analogue conversion bit wide for the DAC circuit chosen, when DAC data format is to have symbol
When number type, S takes 1, otherwise takes 0.
6. narrow pulse signal production method as described in claim 1, which is characterized in that in steps of 5, by the T*fDACIt is a
M continuous data in data is dimensioned to A.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115130484A (en) * | 2022-06-01 | 2022-09-30 | 广州晨控智能技术有限公司 | Frequency-adaptive electronic tag data decoding method, system, device and medium |
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| US20040075462A1 (en) * | 2002-10-21 | 2004-04-22 | Rambus Inc. | Method and apparatus for digital duty cycle adjustment |
| US7545304B1 (en) * | 2006-09-01 | 2009-06-09 | University Of Rochester | Distributed arbitrary waveform generator |
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Application publication date: 20181207 |