CN101354420A - System for detecting programmed control distance-changing accidental resonance square wave - Google Patents
System for detecting programmed control distance-changing accidental resonance square wave Download PDFInfo
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- CN101354420A CN101354420A CNA2008101512779A CN200810151277A CN101354420A CN 101354420 A CN101354420 A CN 101354420A CN A2008101512779 A CNA2008101512779 A CN A2008101512779A CN 200810151277 A CN200810151277 A CN 200810151277A CN 101354420 A CN101354420 A CN 101354420A
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Abstract
The invention discloses a program-controlled variable distance random resonance square wave detection system which is characterized in that a sensor, a program-controlled frequency variable distance module, a bistable analog circuit, a program-controlled frequency compound determinate distance module, a filter module and an A/D conversion chip are sequentially connected together in series and then connected in parallel to a system bus by taking the A/D conversion chip as the output terminal; a general control and user interaction chip, a memory module, a power clock circuit, a general interface control circuit and a D/A conversion chip are respectively and independently connected in parallel to the system bus; after being connected in series with a DSP co-processor, the CPU is also connected in parallel to the system bus; the signal really measured by the sensor is completely flooded and indiscernible; by processing of variable distance, random resonance and filtrating and the like, the signal/noise ratio of the random resonance signal output by the system is reinforced, therefore, the program-controlled variable distance random resonance square wave detection system solves the fine detection problem of strong noise and middle/weak square wave signal, breaks through the limitation of bistable random resonance system single-frequency signal detection, and can realize the functions such as information recognition of large frequency and multi-component, signal amplification and the like.
Description
Technical field
The invention belongs to detection technique and signal Processing, be specifically related to a kind of programmed control distance-changing accidental resonance technology of utilizing and carry out the technology that square-wave signal detects.
Technical background
Bistable system is meant the system with two different steady state (SS)s, and which steady state (SS) is system be in is decided by its starting condition.The accidental resonance technique functions of bistable system comes from the early eighties in last century, and amplifying, detect aspects such as identification, transmission reduction in the enhancing of signal Processing has special advantages, be widely used in multidisciplinary in.The accidental resonance technology is widely used in engineering aspects such as fault diagnosis, image processing, target following in recent years.
Under the small parameter condition, can produce Stochastic Resonance Phenomenon by input signal, noise and bistable system three coordinative role.Its reason is that bistable system has changed equally distributed white noise spectrum structure, makes most of noise energy concentrate on low frequency region, forms the response spectra feature that Lorenz (Lorentz) distributes.When the frequency of input signal is positioned at the low frequency region that noise energy is concentrated, input signal is selected by an amount of noise and is produced Stochastic Resonance Phenomenon.In case the frequency of input signal is left the low frequency region that noise energy is concentrated, Stochastic Resonance Phenomenon reduction disappearance rapidly so, though can the expansion low-frequency energy area and increase noise intensity, this expansion is not only very limited, and is difficult to reselect to signal and makes it to reach accidental resonance.Therefore comparatively speaking, accidental resonance is more responsive to the frequency of input signal.Because Stochastic Resonance Theory research is the small parameter signal, be that the amplitude of signal and the intensity of frequency and noise all are small parameters, therefore when in the face of the noise of hard intensity or greatly during the signal of frequency, particularly contain the big frequency signal of a plurality of frequency contents, the Stochastic Resonance Theory of small parameter will lose efficacy and can't use.Therefore, how to utilize the accidental resonance technology to detect big frequency, multicomponent weak cycle square wave without distortion (hereinafter to be referred as square wave, be not meant square wave non-periodic) signal, and this signal to be carried out that subsequent analysis uses be the difficult point place of breaking through this technology, also the square-wave signal check and analysis under strong noise background had very strong practical value.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide a kind of system for detecting programmed control distance-changing accidental resonance square wave, for meticulous information analysis and signal Processing provide a kind of new information detection technology.
Below in conjunction with accompanying drawing technical scheme of the present invention is illustrated.System for detecting programmed control distance-changing accidental resonance square wave has sensor 1, programmed control frequency displacement module 2, bistable mimic channel 3, programmed control frequency again apart from module 4,24 A/D conversion chips 5, central 32-bit microprocessor 6, general controls and user interactions chips 7, memory module 8, power supply clock circuit 9, general-purpose interface control circuit 10,24 D/A conversion chips 11, DSP coprocessor 12 and filtration modules 13 etc.Its concrete connectivity scenario is: after being connected in series by described order apart from module 4, filtration module 13 and 24 A/D conversion chips 5 by sensor 1, programmed control frequency displacement module 2, bistable mimic channel 3, programmed control frequency are multiple, be parallel to system bus with 24 A/D conversion chips 5 as output terminal.General controls and user interactions chip 7, memory module 8, power supply clock circuit 9 and 10,24 D/A conversion chips 11 of general-purpose interface control circuit independently are parallel to system bus separately.Central authorities' 32-bit microprocessor 6 with also be parallel to system bus (as Fig. 1) after DSP coprocessor 12 is connected in series.The concrete technical scheme that input is handled is: the signal by sensor 1 actual measurement is sent into programmed control frequency displacement module 2, bistable mimic channel 3, programmed control frequency again apart from module 4 (programmed control frequency is multiple to carry out the adjustment of frequency and amplitude apart from module 4 with this accidental resonance signal), filtration module 13 and 24 A/D conversion chips 5 successively as raw data.Through system bus signal being exported to central microprocessor 6 by 24 A/D conversion chips 5 handles with DSP coprocessor 12.Central authorities' 32-bit microprocessor 6 also carries out message exchange apart from module 4, general controls and user interactions chip 7, memory module 8, power supply clock circuit 9,10,24 D/A conversion chips 11 of general-purpose interface control circuit by system bus and programmed control frequency displacement module 2, programmed control frequency again with the process information of DSP coprocessor 12.Being signal frequency will be according to the frequency decision condition of setting through programmed control frequency displacement module 2, makes the frequency displacement and frequency displacement coefficient is kept in the memory module 8, realizes the requirement of accidental resonances to satisfy follow-up bistable mimic channel 3.The mimic channel that bistable mimic channel 3 is made up of operational amplifier is realized (as shown in Figure 2), and wherein s (t) is the input of bistable system, and x (t) is the output of bistable system.The signal of bistable mimic channel 3 outputs carries out the signal recovery by programmed control frequency is multiple apart from module 4.The accurate processing of all controls of central authorities' 32- bit microprocessor 6 and 12 pairs of internal system of DSP coprocessor and computing signal be by the true(-)running that is parallel to general controls on the system bus and user interactions chip 7, memory module 8, power supply clock circuit 9 and 10,24 D/A conversion chips 11 of general-purpose interface control circuit with coordinate control operation and guaranteed.
Description of drawings
Fig. 1 is the catenation principle figure of system of the present invention.
Fig. 2 is bistable mimic channel figure.
Fig. 3 is that programmed control frequency displacement module is formed schematic block diagram.
Fig. 4 forms schematic block diagram for programmed control frequency is multiple apart from module.
Fig. 5 is a programmed control frequency displacement module controls process flow diagram.
Fig. 6 is multiple apart from the module controls process flow diagram for programmed control frequency.
Fig. 7 is primitive period square-wave curve figure.Among the figure: horizontal ordinate is a time shaft, and its scale is 2ms; Ordinate is a magnitude of voltage, and its scale is 100mV.Amplitude is 0.2V
Fig. 8 is the oscillogram of original very noisy.Among the figure: horizontal ordinate is a time shaft, and its scale is 2ms; Ordinate is a magnitude of voltage, and its scale is 500mV.Noise intensity effective value 0.67V.
Square-wave waveform figure after Fig. 9 and the very noisy stack.Among the figure: horizontal ordinate is a time shaft, and its scale is 2ms; Ordinate is a magnitude of voltage, and its scale is 500mV.
Figure 10 programmed control distance-changing accidental resonance system output state curve map.Among the figure: horizontal ordinate is a time shaft, and its scale is 2ms; Ordinate is a magnitude of voltage, and its scale is 5V.
Figure 11 is through the square-wave curve figure of follow-up filtering system output.Among the figure: horizontal ordinate is a time shaft, and its scale is 2ms; Ordinate is a magnitude of voltage, and its scale is 200mV.
Embodiment
Below in conjunction with accompanying drawing and by embodiment technical scheme of the present invention is described further.Each parts annexation such as Fig. 1.Wherein bistable mimic channel 3 as shown in Figure 2, its parameter is: R=15K Ω, R1=R2=150K Ω, C=180pf, the product of multiplier A, B coefficient is taken as 0.001.The accidental resonance state of signal is regulated generation by voltage divider K1, K2.
Detected original weak square wave characteristic signal inputs to programmed control frequency displacement module 2 and bistable mimic channel 3 through sensor 1, realizes that the accidental resonance of characteristic signal extracts, the multiple recovery of finishing characteristic signal apart from module 4 and follow-up filtration module 13 thereof of programmed control frequency.Feature square-wave signal in sensor 1 measured signal is flooded fully by noise and can not differentiate (as shown in Figure 9), and this measured signal is sent into programmed control frequency displacement module 2 as original sampling data.Programmed control frequency displacement module 2 is mainly formed (as Fig. 3) by 16 D/A conversion chip 15-1 in 16 A/D conversion chip 20-1 in program-controlled frequency-changing device 19, the programmed control frequency displacement module, 8 high speed RISC microprocessing units 14 and the programmed control frequency displacement module, the original sampling data data input to 8 high speed RISC microprocessing units 14 through 16 A/D conversion chip 20-1 and carry out the computing of FFT spectrum, and the frequency content of definite signal maximum amplitude correspondence, preserve the signal maximum amplitude simultaneously and use apart from module 4 in order to follow-up programmed control frequency is multiple.(its frequency decision condition is: by maximum 3/4 reference value for comparison of composing the frequency of peak correspondence of signal amplitude according to the frequency Rule of judgment that presets, if greater than 75Hz, then delimit and be big frequency parameter signal, be less than or equal to 75Hz, then delimit and be the small frequency parameter signal), judge whether this signal is big frequency parameter signal, if be foundation then with the signal frequency parameter, frequency increment is set, and (with the reference value that draws previously is standard, 5 interval selection items are arranged, and its value is for being 4 greater than 75Hz less than 300Hz displacement coefficient; Its value is for being 8 greater than 300Hz less than 600Hz displacement coefficient; Its value is for being 12 greater than 600Hz less than 900Hz displacement coefficient; Its value is for being 16 greater than 900Hz less than 1800Hz displacement coefficient; The above signal displacement of 1800Hz coefficient is 24) program-controlled frequency-changing device 19 is carried out the programmed control distance-changing operation, and frequency displacement parameter is kept in the memory module 8, and changing into simulating signal for follow-up program control call again apart from module 4 by the digital signal of 16 D/A conversion chip 15-1 in the programmed control frequency displacement module after with previous processed, the signal behind the displacement is imported the bistable mimic channel 3 shown in Fig. 5 end subsequently.
Input to bistable mimic channel 3 from the signal of programmed control frequency displacement module 2 outputs, the accidental resonance signal that produces through bistable mimic channel 3 inputs to programmed control frequency again apart from module 4.Programmed control frequency is multiple forms (as Fig. 4) apart from module 4 by multiple 16 A/D conversion chip 20-2, the program control N of presetting system counter 16, phase-locked loop circuit 17,16 8- digit microcontrollers 18 and 16 the D/A conversion chip 15-2 in module of programmed control frequency.Accidental resonance signal through 3 outputs of bistable mimic channel enters multiple 16 the A/D conversion chip 20-2 in module of programmed control frequency also according to the program control variable signal amplitude of signal maximum of storing in advance, satisfy the requirement of 16 A/D conversion chip 20-2,16 8-digit microcontrollers 18 frequency displacement coefficient and the signal maximum reading to store in advance meanwhile, and drive by 16 8-digit microcontrollers 18 and can preset N system counter 16 and phase-locked loop circuit 17 carries out the multiple distance of frequency, and change into simulating signal by the digital signal of multiple 16 the D/A conversion chip 15-2 in module of programmed control frequency after with previous processed, import filtration module 13 subsequently and carry out filtering, 24 the A/D conversion chips 5 that input at last as shown in Figure 6 carry out follow-up further analysis.
Embodiment: suppose that the signal that sensor 1 is surveyed is made up of one-period square-wave curve (as shown in Figure 7) and very noisy curve (as shown in Figure 8), and square-wave signal is flooded fully by noise and can not differentiate (as shown in Figure 9).The amplitude of square wave is 0.2V, and the cycle is 0.002s, and the intensity of noise is 0.67V.Recording its reference frequency value through programmed control frequency displacement module 2 is 375Hz, because of this signal is decided to be big frequency parameter signal through the frequency decision condition, so come into effect displacement, this 375Hz signal meets the condition less than 600Hz greater than 300Hz, its displacement coefficient is 8, and be kept in the memory module 8, the simulating signal of changing through 16 D/A conversion chip 15-1 in the programmed control frequency displacement module behind the displacement enters bistable mimic channel 3 and carries out accidental resonance, import programmed control frequency subsequently and carry out the multiple distance of frequency (N of the program control N of presetting system counter 16 gets 8 among this embodiment) apart from module 4 again, signal input filtration module 13 after the multiple distance carries out filtering obtains a result, as shown in figure 11.The accidental resonance state of programmed control distance-changing accidental resonance system output is as curve (all signals are tested by Tektronix TDS2024 oscillograph) shown in Figure 10.
24 A/D interface chips 5 are mainly used in and will collect central 32-bit microprocessor 6 through system bus by the simulating signal of filtration module 13 output and carry out subsequent analysis for follow-up central 32-bit microprocessor 6 and the meticulous signal analysis software in the DSP coprocessor 12 thereof.
Central authorities' 32-bit microprocessor 6, it is used for the control computing of entire system and the coordination of functional performance, adopt 32 high-performance embedded microcontroller chips to make up, under the working environment of supporting with it embedded real-time operating system, mainly finish entire system control and coordination, and can under the cooperation of the coprocessor 12 that makes up by the high-speed dsp digital signal processing chip, finish the big and high complicated control task of real-time of some calculated amount.
High-speed dsp process chip 12, it cooperates central 32-bit microprocessor 6 to finish the big and high complex task of real-time of some operands as the coprocessor of central 32-bit microprocessor 6, also can be used for the realization of large-scale data processing capacity separately.
General controls and interactive maintenance chip 7 are mainly finished the processing procedure relevant with user's input and output.General controls and user interactions chip 7 are connected with other chips in central 32-bit microprocessor 6 and coprocessor 12 and the system for detecting programmed control distance-changing accidental resonance square wave by system bus, directly control general-purpose interface control circuit 10 produces various output quantities and handles the input quantity that this interface transmits.
Power supply clock circuit 9 mainly act as and offers clock signal and the system time that all chips need in a whole set of system for detecting programmed control distance-changing accidental resonance square wave, belongs to necessary additional device.
24 D/A control chips 11, the control signal that mainly act as central 32-bit microprocessor 6 outputs that will be attached thereto by system bus is carried out digital-to-analog conversion, when outside noise is not too big, produce the white Gaussian noise of any intensity, promote the resonance effect of stochastic resonance system.
Characteristics of the present invention and useful effect are: this detection system has broken through bi-stable stochastic resonance theory system simple signal The limitation that detects has overcome bistable system and has easily made the multiple-frequency signal compression and produce the problem of distortion, has given full play to bistable The signal detection ability of system. Because technique has solved the meticulous test problems of weak square-wave signal in the very noisy, therefore Can realize the functions such as big frequency, the identification of multicomponent information and signal amplification. It is easy to use simultaneously, and output signal has Degree of precision, processing for follow-up more convenient and meticulousr information analysis and signal provides necessary technical guarantee.
Claims (5)
1. system for detecting programmed control distance-changing accidental resonance square wave, by sensor, programmed control frequency displacement module, the bistable mimic channel, programmed control frequency is multiple apart from module, 24 A/D conversion chips, central authorities' 32-bit microprocessor, general controls and user interactions chip, memory module, the power supply clock circuit, the general-purpose interface control circuit, 24 D/A conversion chips, DSP coprocessor and filtration module are formed, it is characterized in that by sensor (1), programmed control frequency displacement module (2), bistable mimic channel (3), programmed control frequency is multiple apart from module (4), filtration module (13) and 24 A/D conversion chips (5) are parallel to system bus with 24 A/D conversion chips (5) as output terminal after being connected in series by described order; General controls and user interactions chip (7), memory module (8), power supply clock circuit (9) and general-purpose interface control circuit (10), 24 D/A conversion chips (11) independently are parallel to system bus separately; Central authorities' 32-bit microprocessors (6) with also be parallel to system bus after DSP coprocessor (12) is connected in series, signal by sensor (1) actual measurement is sent into programmed control frequency displacement module (2) successively as raw data, bistable mimic channel (3), programmed control frequency is multiple apart from module (4), filtration module (13) and 24 A/D conversion chips (5), through system bus signal is exported to central 32-bit microprocessor (6) by 24 A/D conversion chips (5) and handle with DSP coprocessor (12), the process information of central 32-bit microprocessor (6) and DSP coprocessor (12) is also by system bus and programmed control frequency displacement module (2), programmed control frequency is multiple apart from module (4), general controls and user interactions chip (7), memory module (8), power supply clock circuit (9), general-purpose interface control circuit (10), 24 D/A conversion chips (11) carry out message exchange.
2. according to the described system for detecting programmed control distance-changing accidental resonance square wave of claim 1, it is characterized in that described programmed control frequency displacement module (2) is by program-controlled frequency-changing device (19), 16 A/D conversion chips (20-1) in the programmed control frequency displacement module, 16 D/A conversion chips (15-1) in 8 high speed RISC microprocessing units (14) and the programmed control frequency displacement module are formed, measured signal inputs to 8 high speed RISC microprocessing units (14) through 16 A/D conversion chips (20-1), is driven program-controlled frequency-changing device (19) and is imported bistable mimic channel (3) through 16 D/A conversion chips (15-1) by 8 high speed RISC microprocessing units (14).
3. according to the described system for detecting programmed control distance-changing accidental resonance square wave of claim 1, it is characterized in that described programmed control frequency multiple apart from module (4) by multiple 16 the A/D conversion chips (20-2) in module of programmed control frequency, the program control N system counter (16) that presets, phase-locked loop circuit (17), 16 8-digit microcontrollers (18) and 16 D/A conversion chips (15-1) are formed, accidental resonance signal by bistable mimic channel (3) output inputs to 16 8-digit microcontrollers (18) through multiple 16 the A/D conversion chips (20-2) in module of programmed control frequency, drives the program control N of presetting system counter (16) and phase-locked loop circuit (17) and the input filtration modules of 16 the D/A conversion chips (15-1) in programmed control frequency displacement module (13) by 16 8-digit microcontrollers (18) and carries out filtering.
4. according to claim 1 or 2 described system for detecting programmed control distance-changing accidental resonance square wave, it is characterized in that the program-controlled frequency-changing device in the described programmed control frequency displacement module (2) is a low pressure program-control frequency converting device chip; Displacement coefficient in the described programmed control frequency displacement module (2) is stored in the described memory module (8).
5. according to claim 1 or 3 described system for detecting programmed control distance-changing accidental resonance square wave, it is characterized in that N in the multiple program control N of the presetting system counter (16) in module (4) of described programmed control frequency is more than or equal to 32.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226169A (en) * | 2012-06-12 | 2013-07-31 | 嘉兴联星微电子有限公司 | Square wave detector for wireless wake-up circuit |
| CN103454522A (en) * | 2013-08-08 | 2013-12-18 | 中国人民解放军总装备部军械技术研究所 | Electronic replacement part technology state automatic detection system and method based on PXI bus |
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2008
- 2008-09-10 CN CN2008101512779A patent/CN101354420B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226169A (en) * | 2012-06-12 | 2013-07-31 | 嘉兴联星微电子有限公司 | Square wave detector for wireless wake-up circuit |
| CN103226169B (en) * | 2012-06-12 | 2015-07-08 | 殷明 | Square wave detector for wireless wake-up circuit |
| CN103454522A (en) * | 2013-08-08 | 2013-12-18 | 中国人民解放军总装备部军械技术研究所 | Electronic replacement part technology state automatic detection system and method based on PXI bus |
| CN103454522B (en) * | 2013-08-08 | 2016-02-03 | 中国人民解放军总装备部军械技术研究所 | Based on electronics spare part state of the art automatic checkout system and the method for PXI bus |
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