CN105549468B - A kind of grating signal simulative generator - Google Patents
A kind of grating signal simulative generator Download PDFInfo
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- CN105549468B CN105549468B CN201510951621.2A CN201510951621A CN105549468B CN 105549468 B CN105549468 B CN 105549468B CN 201510951621 A CN201510951621 A CN 201510951621A CN 105549468 B CN105549468 B CN 105549468B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25314—Modular structure, modules
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Abstract
The invention discloses a kind of grating signal simulative generator, and it includes control, communication, signal generation, phase offset, direct current offset, noise generation, wave number control and D/A modular converters.Signal produces, phase offset and dc offset module sequentially connect, and produces the signal of Parameter adjustable；Wave number control module is arrived after being superimposed again with noise generation module；Data signal is switched to analog signal output by D/A modular converters；Control module is produced through communication module with signal generation, phase offset, direct current offset, noise and wave number control module is connected, to realize control function.This signal generator energy simulation grating and the actual conditions of laser interferometer displacement measurement, export two-way frequency, amplitude, phase, waveform number and the controllable cosine and sine signal of direct current offset, different degrees of random noise can be loaded with simulating actual conditions, and the displacement value of emulation can be provided, for the analysis of cosine and sine signal computation Diffie-Hellman problem circuit error and rectification building-out research in grating and laser interferometer displacement measurement.
Description
Technical field
The invention belongs to signal source generation technique field, more particularly, to a kind of grating signal simulative generator.
Background technology
Grating and laser interference metering technology are important accurate displacement measurement technologies, be unable to do without cosine and sine signal high accuracy
Computation Diffie-Hellman problem technology.In engineering practice, due to optics, machinery, electric and such environmental effects, it is difficult to ensure actual grating and swash
Interference of light cosine and sine signal has stable amplitude, phase, frequency, waveform number and a dc shift, also inevitable in signal
Noise be present, these can all influence grating and laser interferometer displacement measurement accuracy.To reduce or avoid correlative factor to grating and
The influence of laser interference measuring accuracy is studied sane just remaining, it is necessary to constantly improve cosine and sine signal computation Diffie-Hellman problem circuit system
String signal computation Diffie-Hellman problem circuit and signal errors analysis backoff algorithm.Correlative study and circuit and algorithm in face of various signals because
In the validity test that element influences, the actual cosine and sine signal simulative generator of engineering is essential.
At present, the implementation method of signal generator has a lot.One kind is simulative method, and simulative method is to utilize simulation
The method of circuit realizes signal generator, even if it is sinusoidal to build RC or LC with traditional electronic device such as electric capacity, resistance, amplifier
Signal generator.The change of output frequency is realized by changing the parameter value of component in circuit.Though this mode
Right cost is very low, but because this mode has used substantial amounts of discrete component, is limited by its operation principle, its frequency
Rate stability can reduce；In addition other various modulation functions, which also compare, is difficult to the circuit, it is necessary to very complicated, debugging trouble
And precision is relatively low, the communication with host computer can not be realized.Another kind of is direct digital synthesis technique method, and Direct Digital frequency is closed
It is a kind of new frequency synthesis technique into technology, it goes out to send waveform directly needed for synthesis from the concept of phase.With traditional frequency
Rate synthetic technology is compared, and it has the advantages of a lot, for example, with higher frequency resolution, faster frequency conversion speed, more
Easy programming and total digitalization, and it is more easy of integration, so having obtained more and more extensive application；But this method uses too many core
Piece, not enough succinctly, it is impossible to carry out any adjustment of parameter with the need.It is finally microprocessor control DAC methods, it is led to by MCU
Cross calculating and produce Wave data, then Wave data is converted into analog voltage by DAC, it is continuous to export to realize signal.
Because many functions of the method are realized by software, so the scalability of function is relatively good and reliable and stable.But typically by
The signal generator function of method design is often not comprehensive enough, can not such as realize the strict controllable of initial phase, i.e., can not pass through
Control phase realizes the positive and negative random change in signal output direction, cannot also emulate the direction of displacement；Different journeys can not be loaded
The random noise of degree, i.e., can not simulate the grating signal in actual environment, cannot also realize emulation signal to circuit error school
The checking of normal operation method；The displacement value of emulation can not be provided, i.e., can not realize signal output and the output of given waveform number
The STOCHASTIC CONTROL that process stops and continued, it also can not just complete the checking to counting and displacement measurement function.These result in by
The in general signal generator of method design can not meet the technical requirements of grating signal simulative generator, i.e., can not produce ideal
Emulation grating signal, cannot also be used for well grating and laser interferometer displacement measurement cosine and sine signal computation Diffie-Hellman problem sensing
Circuit error is analyzed and the research of rectification building-out.
The content of the invention
The defects of for prior art, it is an object of the invention to provide a kind of grating and laser interference for producing simulation
The signal generator of orthogonal signalling in displacement measurement.
To achieve the above object, grating signal simulative generator provided by the invention, including control module, communication module,
Signal generator module, phase shift module, dc offset module, wave number control module and D/A modular converters, it is characterised in that：
The signal generator module, phase shift module and dc offset module sequentially connect, and signal generator module produces
Signal divide two-way, through phase shift module and dc offset module, form setting phase and phase difference and setting direct current offset
Two paths of signals, from dc offset module export；
The output signal of the dc offset module is after wave number control module and D/A modular converters, output two-way setting
The sine or cosine signal of output waveform number, phase and phase difference, direct current offset；
The control module by communication module, respectively with signal generator module, phase shift module, dc offset module
It is connected with wave number control module, for setting phase and phase difference, direct current offset, output waveform number.
Further, the grating signal simulative generator also includes noise generation module, and it passes through communication module and control
Molding block is connected, and its running parameter is set by control module；The output of noise generation module exports with the dc offset module
After addition, wave number control module is sent into.
Further, the control module of the grating signal simulative generator is run in computer, by serial ports with leading to
Letter module is connected；Signal generator module, phase shift module, dc offset module, noise generation module and wave number control module
Realized by dsp system；The dsp system refers to DSP devices additional power circuitry, reset circuit, clock circuit, DA conversions
The peripheral circuits such as circuit, USB serial port circuits and jtag interface circuit are formed.
Further, the communication module of the grating signal simulative generator is the SCI mouths of dsp system, passes through USB serial ports
Realize and communicate to connect with computer.
Further, the signal generator module of the grating signal simulative generator produces according to dsp system clock division
The signal of raw different frequency.
Further, the phase shift module of the grating signal simulative generator to signal generator module by exporting
Two paths of signals sets different delays, to realize different phase shifts, for realizing the strict control of two paths of signals phase difference.
Further, the dc offset module of the grating signal simulative generator on the basis of original signal by adding
Add the direct current signal being sized, to realize the control to signal difference direct current offset, and then realize two paths of signals direct current offset
The regulation of amount.
Further, the noise generation module of the grating signal simulative generator is existed by the noise data that prestores
In FLASH modules, by reading noise data during work, realize that noise generates, with the actual grating signal of more real simulation.
Further, the wave number control module of the grating signal simulative generator works as ripple by being counted to signal waveform
When shape number reaches preset value, stop signal output, the waveform output of regulation number is realized, for emulating displacement value.
Further, the D/A conversion module of the grating signal simulative generator is using the D/ for being external in dsp system SPI mouths
A chips are realized.
Grating signal simulative generator proposed by the present invention can simulation grating and laser interferometer displacement measurement reality
Situation, the strict controllable cosine and sine signal of frequency, amplitude, phase, waveform number and direct current offset of two-way independence is exported, can
Different degrees of random noise is loaded with simulating actual conditions, and the displacement value of emulation can be provided, is done for grating and laser
Relate to the analysis of cosine and sine signal computation Diffie-Hellman problem circuit error and the research of rectification building-out in displacement measurement.
Brief description of the drawings
Fig. 1 is the system principle diagram of grating signal simulative generator provided by the invention；
Fig. 2 is the system block diagram of grating signal simulative generator specific embodiment provided by the invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and embodiment, it is right
The present invention is further detailed.It should be appreciated that specific embodiment described herein is only to explain the present invention, and do not have to
It is of the invention in limiting.
Fig. 1 shows the system principle diagram of grating signal simulative generator provided by the invention.It is main to include control mould
Block, communication module, signal generator module, phase shift module, dc offset module, noise generation module, wave number control module
With D/A modular converters.Wherein, signal generator module, phase shift module and dc offset module sequentially connect, by caused letter
Number carry out parameter adjustment；Wave number control is output to after the signal after adjustment is superimposed with noise signal caused by noise generation module again
The waveform for setting quantity can be output to D/A converter module by molding block, wave number control module；D/A converter module believes numeral
Exported after number being converted to analog signal；Control module is produced through communication module and signal generation, phase offset, direct current offset, noise
Raw, wave number control module is connected, and realizes control function.
During work, pass through control module setting signal frequency, amplitude, phase, direct current offset, noise amplitude and waveform number
Each parameter, the state modulator function to other each modules is realized, described control module is run in computer, passes through computer
Transmit signal parameter；Other each modules are then realized by dsp system.Communication module realizes control module and signal generation, phase
Skew, direct current offset, noise produces and the connection of wave number control module, the present embodiment realize computer and DSP by USB serial ports
Chip SCI connection, and then complete parameter transmission.The exportable two-way sine of signal generator module or cosine signal, here according to
Dsp system clock division produces the signal of different frequency, and amplified realizes the setting of different amplitudes.Phase shift module
The strict control of two paths of signals phase can be realized, realizes different phases by setting different delays to two paths of signals here
Potential difference, can so ensure the two paths of signals of output has strict controllable phase difference；Actual grating signal is constantly present change
Phase difference, here can real simulation grating signal, for correcting the phase compensating circuit and algorithm of grating signal.Direct current
Offset module can realize the regulation of two paths of signals DC offset, and it is by being added on the basis of original cosine and sine signal
The signal numerical value that is sized realizes the control of signal difference direct current offset.Noise generation module can produce different degrees of
Random noise, it is to deposit in advance caused noise data in the FLASH inside dsp system, is read when needed corresponding
Noise figure, be output to wave number control module after being superimposed with sinusoidal or cosine signal；Signal now being capable of more real mould
Intend actual grating signal, reach preferably simulated effect.Wave number control module can control the number of the waveform of output, pass through
Control to output waveform number can correspond to the displacement value for providing emulation, and this function can be used for the meter of correction grating signal
Number circuit.D/A modular converters convert digital signals into analog voltage signal output, D/A conversion chips and DSP SPI connections.
In embodiments of the present invention, the system group of grating signal simulative generator specific embodiment is given as shown in Figure 2
Into block diagram.Main to include computer, USB serial ports and dsp system, dsp system includes dsp chip TMS320F2812, DA conversion electricity
Road, power circuit, reset circuit, clock circuit and jtag interface circuit, it is a typical DSP minimum system.
During work, first from computer by the serial ports of USB interface form to DSP send emulation grating signal parameter and
Operational order；After dsp chip receives parameter and operational order, it is carried out accordingly by the program being solidificated in dsp chip
Processing, obtain the two-way sine or cosine signal of setpoint frequency, amplitude, phase, direct current offset, noise level and waveform quantity；
Analog signal is converted digital signals into through D/A modular converters again, finally exports corresponding sine or cosine emulation signal, it is complete
Produced into signal.Power circuit provides required voltage for each module of system；Reset circuit is answered in particular cases DSP's
Position, provides protection, to ensure the normal operation of system for system；Clock circuit provides system clock for DSP；Jtag interface circuit
In-circuit emulation for program is debugged.
During work, the control module of system is run in computer, is mainly used to set waveform parameter and control instruction.It is first
The first frequency, amplitude, phase and the phase difference that set two-way to emulate signal in computer software operation interface, direct current offset, make an uproar
The parameter such as sound and waveform number；Then control instruction is sent to dsp system by USB serial ports.
USB serial communication circuits are mainly used in connecting computer and dsp system, realize the transmission of data.Due to dsp chip
There is no the serial ports of USB interface form, so adjusting chip from PL2303, realize the USB serial ports of computer and DSP SCI mouths
Connection, and then realize communication function.
Dsp chip is the core of whole grating signal generator, for produce frequency, amplitude, phase and phase difference,
Direct current offset, noise and the controllable two-way of output waveform number is sinusoidal or cosine signal.What dsp chip here was selected is
TMS320F2812.TMS320F2812 realizes that signal produces and the principle of parameter adjustment is specific as follows：
Parameter assignment is carried out first, and the parameter value of setting is passed to dsp chip by computer by serial ports, and dsp chip connects
After receiving data, amplitude A, frequency f, initial phase φ, direct current offset Ad, noise amplitude An and periodicity N parameter are carried out first
Transmit.Followed by judging whether timing t reaches, if f is signal frequency, Pn is the sampling number of a signal period, then
Nf is the waveform points of output in 1 second, then t=1/ (Pn*f) is the timing of a sampled point output, so as to realize setting
Sine or the cosine signal output of frequency.Timing to then carry out signal amplitude, initial phase and DC offset calculating and
Set, i.e., output signal is：Vsin=Asin (2 π f+ π φ/180)+Ad, is so achieved that signal amplitude, phase, direct current are inclined
The setting of shifting.Followed by the random number Z of [- 1 ,+1] is produced, being apparent from rand ()/RAND_MAX (being set as 32767) can produce
The random number of [0 ,+1], then through computing Z=2 [rand ()/RAND_MAX] -1, you can [- 1 ,+1] random number Z, and by its
In FLASH inside deposit DSP, it is necessary to when read corresponding noise figure, and be added to above on caused signal, i.e., it is defeated
Going out signal is：Vsin=Asin (2 π n1/n+ π φ/180)+Ad+Z*An.Then waveform is set to export points P1 and waveform output
Periodicity N1 initial value is 0, the sampling number Pn=360 in each cycle, and the points can require according to the difference of signal quality
Suitably adjusted.Then counting, count is incremented by P1, as P1=Pn, sets P1=0, calculates waveform output periodicity N1；Work as N1
During=N, N1=0 is set, the D/A conversions of signal voltage value is at this moment proceeded by, finally exports two-way sine or cosine signal,
This two step is mainly used to realize calculating and the output control of given waveform number.
D/A conversion circuit modules are used to data signal caused by dsp chip being converted to corresponding analog voltage, then according to
Secondary output forms required waveform, and the DAC chip of the system selection is AD5754R.
Power circuit provides required voltage for each module of system；Grating measurement emulation signal generator uses 220V's
AC power is powered, and internal circuit needs 12V, 5V, 3.3V and 1.8V DC voltage, therefore firstly the need of using transformer
220V alternating voltage is changed into 12V DC voltage, then conversion of the 12V voltages to 5V voltages is realized from LM2596,
TPS767D301 chips realize conversion of the 5V voltages to 3.3V and 1.8V voltages, with for whole circuit system provide needed for it is each
Magnitude of voltage.Reset circuit is that dsp chip is directly resetted；So whole circuit can be answered under any circumstance
Position, prevents program fleet or other wrong appearance.Clock circuit is mainly that DSP provides system clock；By to system clock
Frequency dividing just achievable regulation and control to frequency and phase, used herein is 30MHz crystal oscillator；Jtag interface circuit is used
To realize that the in-circuit emulation of program is debugged, by jtag interface by the RAM of download program to dsp chip, facilitate debugging routine
When search mistake；After the completion of debugging, finally by the FLASH of program Solidification to dsp chip.
Grating signal simulative generator proposed by the present invention can export the sine or cosine signal of two-way independence, its amplitude
Adjusting range is ± 10.8V, and frequency adjustment range 0-1000Hz, direct current offset can be adjusted arbitrarily with initial phase, and can be added
Different degrees of random noise is carried with simulating actual conditions, and the quantity of output waveform can be controlled, provides the displacement value of emulation, is used
The analysis of cosine and sine signal computation Diffie-Hellman problem circuit error and the research of rectification building-out in grating and laser interferometer displacement measurement.
The content of above-mentioned embodiment is example of the present invention, and present disclosure is not limited to
Examples detailed above and accompanying drawing disclosure.The structure and thinking of design to the present invention, simple change or change design is done,
Both fall within the scope of protection of the invention.
Claims (9)
1. a kind of grating signal simulative generator, including control module, communication module, signal generator module, phase shift module,
Dc offset module, wave number control module and D/A modular converters, it is characterised in that：
The signal generator module, phase shift module and dc offset module sequentially connect, and believe caused by signal generator module
Number point two-way, through phase shift module and dc offset module, form the two of setting phase and phase difference and setting direct current offset
Road signal, exported from dc offset module；
The output signal of the dc offset module is after wave number control module and D/A modular converters, output two-way setting output
The sine or cosine signal of waveform number, phase and phase difference, direct current offset；
The control module by communication module, respectively with signal generator module, phase shift module, dc offset module and ripple
Number control module is connected, for setting phase and phase difference, direct current offset, output waveform number；
The wave number control module is by the way that to signal waveform counting number, when waveform number reaches preset value, stop signal is defeated
Go out, realize the waveform output of regulation number.
2. a kind of grating signal simulative generator according to claim 1, it is characterised in that it also includes noise and produces mould
Block, it is connected by communication module with control module, and its running parameter is set by control module；The output of noise generation module with
After the dc offset module output is added, wave number control module is sent into.
A kind of 3. grating signal simulative generator according to claim 1 or 2, it is characterised in that：The control module fortune
Row is connected in computer by serial communication port with communication module；Signal generator module, phase shift module, direct current offset
Module, noise generation module and wave number control module are realized by dsp system.
A kind of 4. grating signal simulative generator according to claim 1 or 2, it is characterised in that：The communication module is
The SCI mouths of dsp system, realized and communicated to connect by USB serial ports and computer, or and the signal generator module according to DSP systems
Clock division unite to produce the signal of different frequency.
A kind of 5. grating signal simulative generator according to claim 1 or 2, it is characterised in that：The phase offset mould
Block sets different delays by the two paths of signals exported to signal generator module, to realize different phase shifts, for realizing two
The strict control of road signal phase difference.
A kind of 6. grating signal simulative generator according to claim 1 or 2, it is characterised in that：The direct current offset mould
The direct current signal that block is sized by being added on the basis of original signal, to realize the control to signal difference direct current offset
System, and then realize the regulation of two paths of signals DC offset.
A kind of 7. grating signal simulative generator according to claim 3, it is characterised in that：The noise generation module leads to
Cross and prestore noise data in dsp system, by reading noise data during work, realize that noise generates.
A kind of 8. grating signal simulative generator according to claim 1 or 2, it is characterised in that：The D/A modular converters
Realized using the DA chips for being external in dsp system SPI mouths.
A kind of 9. grating signal simulative generator according to claim 1 or 2, it is characterised in that：The dsp system refers to
DSP minimum systems, it includes dsp chip, power circuit, reset circuit, clock circuit, D/A change-over circuits, USB serial port circuits
With jtag interface circuit.
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| CN107884703B (en) * | 2017-11-20 | 2020-06-09 | 北京空间机电研究所 | Input signal simulation source for noise test of infrared detector video processing circuit |
| CN111045882B (en) * | 2019-12-27 | 2023-09-19 | 深圳市越疆科技有限公司 | 3D printer grating data acquisition card test system and test method |
| CN114543852A (en) * | 2021-12-30 | 2022-05-27 | 江苏集萃微纳自动化系统与装备技术研究所有限公司 | Grating signal conditioning circuit, system and method |
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