CN101303377A - Parameter acquisition method of discharging radiation pulse - Google Patents
Parameter acquisition method of discharging radiation pulse Download PDFInfo
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- CN101303377A CN101303377A CNA2008100446727A CN200810044672A CN101303377A CN 101303377 A CN101303377 A CN 101303377A CN A2008100446727 A CNA2008100446727 A CN A2008100446727A CN 200810044672 A CN200810044672 A CN 200810044672A CN 101303377 A CN101303377 A CN 101303377A
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Abstract
The invention disclosed a parametric acquisition method of discharging radiation pulse, which relates to a digital parameter extraction method of pulse signals and aims at solving a contradiction between high speed sampling rate and large sampling data quantity in the current pulse acquisition technique. The method comprises the steps that: pulse detection signals are carried out high speed analog-digital conversion to be conversed into continuous digital pulse signals; the digital signals are compared with a trigger level, and pulse capture is started if the digital signals are higher than the trigger level and stopped later if the digital signals are lower than the trigger level and a latched pulse parametric data group is output; in order to reduce effective output flow rate and maintain a maximum dynamic range, the trigger level automatically adjusts according to the frequency of output pulse in a unit adjustment period and under the control of negative feedback algorithm; the pulse parameter values output comprises peak value, peak value time and pulse width. The method of the invention can be applicable to parametric acquisition of thunderbolt or local discharging pulse signals and pulse signal acquisition at other occasions.
Description
Technical field
The present invention relates to a kind of parameter acquisition method of pulse signal, the parameter acquisition method of particularly a kind of thunder and lightning and shelf depreciation pulses of radiation signal.
Background technology
In engineering survey and scientific research field, often demand side to continuously, at random pulse event.These impulse type incidents have several common characteristic:
One, the moment completely random of Chu Xianing is subjected to complicated multiple reason control in other words, does not have tangible pests occurrence rule;
Two, the dutycycle of pulse signal is very little, and a large amount of Noise Background " remainder certificate " is to measuring and study without any being worth contribution;
Three, the effective bandwidth of pulse is very wide, and energy is very concentrated on the time distributes;
Four, the disturbing pulse signal that has many other reasonses to cause on measuring-signal, the resolution of these undesired signals and target pulse signal be difficulty relatively;
Five, the amplitude of pulse signal has bigger dynamic range;
Type signal with These characteristics is exactly the partial discharge pulse of nature lightning and high voltage electric equipment.
A kind of pulse data acquisition method based on the A/D conversion is disclosed in volume in " University Of Science and Technology Of Shandong's journal " Dec in 2006 the 25th the 4th interim " based on the design of the multiplex pulse data acquisition unit of the A/D conversion " literary composition, it gathers mechanism is in the duration of a pulse it to be carried out the continuous several times sampling, calculate minimum sampling number in the pulse according to minimum period of pulse signal and sample rate, thereby judge whether to occur the rising edge or the negative edge of pulse, calculate pulse data according to the number of rising edge or negative edge.The shortcoming of this acquisition method is that sampling rate is lower, and when the disturbing pulse signal is arranged on the measuring-signal, is difficult to undesired signal and target pulse signal resolution are opened, and is not suitable for the collection of lightening pulse.
A kind of pulse collection technology is disclosed in " electronic measurement technique " magazine the 29th volume the 4th interim " Pulse signal acquisition system " August in 2006 literary composition, it isolates pulse signal strength control that sensor is transmitted in the dynamic range of high-speed collection card by photoelectricity, has adopted the independent analog-to-digital conversion device (ADC) of 4 12 20MHz to sample.When all channel data total amounts of single triggering collection were no more than FIFO (First In First Out, the first in first out data buffer) buffer memory of 32K, every passage can be sampled by the AD sample rate of the highest 20MHz.When the data total amount surpasses the FIFO buffer area of 32K, transmit the data directly to calculator memory in DMA (Direct Memory Access, direct memory access) mode, speed will be subjected to the pci bus bandwidth constraints.The weak point of this pulse collection mode is that high sampling rate and the port number of sampling, the data volume of collection and the bandwidth of pci bus that it can reach all has relation, when being used for the collection of thunder and lightning or shelf depreciation pulses of radiation, will so just probably can miss the thunder and lightning signal of a lot of keys because of its huge data volume greatly reduces sampling rate.
Summary of the invention
It is low to the objective of the invention is to solve the sampling rate that prior art exists, undesired signal and echo signal are difficult for differentiating or reducing sampling rate because of data volume is huge and cause the problem of missing discharge pulse signal, to solve high-speed sampling speed that existing pulse collection technology exists and the contradiction between the huge sampled data output, provide a kind of can the continuous recording thunder and lightning or the high speed acquisition method of shelf depreciation radiation randomly pulsed phase signal parameter, real-time by digital signal to the sign discharge pulse of high speed analog-digital conversion converter output, the dynamic examination and Parametric Analysis, realization is to discharge pulse key message (pulse signal peak value, peak value constantly, pulse width) record, avoid the storage and the transmission of a large amount of gibberishes, thereby realize the high speed parametrization record and the analysis of high-speed and continuous pulse information, statistics.
Purpose of the present invention realizes by following technical proposals:
The parameter acquisition method of discharging radiation pulse comprises the steps:
A. the discharging radiation pulse signal that receives is carried out detection and is converted to continuous digital pulse signal, then digital pulse signal and triggering level are compared, be higher than the acquisition procedure that triggering level then begins a pulse, be lower than triggering level and then stop this process, and export the pulse parameter values that the pulse capture process record arrives simultaneously;
B. triggering level is carried out negative feedback according to the pulse generation frequency in the unit adjustment cycle and is adjusted automatically.
Among the described step a, the pulsatile once acquisition procedure starts from the digital pulse signal amplitude and is higher than triggering level, ends at the digital pulse signal amplitude and is lower than triggering level; The pulse parameter values of output is meant peak amplitude, the peak value moment and the pulse width of this pulse; In each pulse capture process, each data and the current data in the peak value register of continuous digital pulse signal are compared, if data then latch current data as peak value greater than the peak value register data, simultaneously the current moment being deposited is the peak value moment, and this operation lasts till this pulse capture process end always; Pulse width is a sampling period number in the pulse capture process, pulse width register zero clearing when pulse capture begins, in acquisition procedure, the sampling period is counted, end is caught in pulse when digital pulse signal is lower than triggering level, the pulse width that the value of latch pulse width register is obtained as this acquisition procedure; The negative feedback self-regulating process of triggering level is among the described step b: according to the pulse number that records in each adjustment cycle current triggering level is adjusted, even pulse number reaches upper limit threshold, and then triggering level improves a numerical value unit; If pulse number is less than lower threshold, then triggering level reduces a numerical value unit, and each adjustment cycle carries out this set-up procedure when finishing, and adjusted triggering level is as the triggering level numerical value in new cycle.
The present invention adopts the method that comprises above-mentioned steps, continuously write down the pulse signal of thunder and lightning or shelf depreciation by the high speed analog-digital conversion conversion process, and the pulse signal of gathering is screened by triggering level being carried out the self-adjusting method of negative feedback, quantity according to recording impulse, the fluctuate numerical value of triggering level of amplitude, both guaranteed the rationality of image data amount, avoid occurring the phenomenon of data congestion, between data acquisition validity and collecting device ability, reach rational balance, can reduce triggering level in due course automatically again, so that can monitor littler discharge signal, for lightning in the early stage local discharge signal of scope and the early stage cloud in the nature lightning and be used for the thunder and lightning disaster alarm and have very important significance.
As seen, adopt method of the present invention, compared with prior art, both had higher sampling rate, can differentiate undesired signal and echo signal again, avoid missing the discharge pulse signal that gather, between data volume and sampling rate, realized more rational balance, to realize to discharge pulse key message (pulse signal peak value, peak value constantly and pulse width) record, avoid the storage and the transmission of a large amount of gibberishes, thereby realize the parametrization identification of high-speed and continuous pulse information and gather, provide decision-making foundation for lightning in the early stage local discharge signal of scope and the early stage cloud in the nature lightning is used for the thunder and lightning disaster alarm.The present invention is applicable to the parametric acquisition of the pulse signal of thunder and lightning or shelf depreciation.
Description of drawings
Fig. 1 is the synoptic diagram of the pulse capture among the present invention.
Embodiment
The present invention is further illustrated below in conjunction with specific embodiments and the drawings.
The parameter acquisition method of discharging radiation pulse comprises the steps:
A. antenna and VHF or UHF receiver are the conversion of signals of the assigned frequency band of the discharge pulse of space radiation base band pulse signal after the detection, for maximum dynamic range record discharge pulse signal, the output stage of receiver is designed to the logarithmic detector characteristic, effectively the recording impulse dynamic range reaches 80dB, by VHF or UHF receiver discharge pulse signal is amplified, obtain the pulse detection signal;
B. the pulse detection signal that receives is amplified and filtering, and the pulse detection signal is converted into digital pulse signal by the high-speed AD converter (ADC) of 50Msps/12 position;
C. digital pulse signal and triggering level are compared, be higher than triggering level and then begin a pulse capture process; Be lower than triggering level and then stop this subpulse acquisition procedure, and export the pulse parameter values that the pulse capture process record arrives simultaneously;
The acquisition procedure of pulse parameterization is: the peak value register is locked current pulse amplitude as peak value when acquisition procedure begins; The zero clearing of pulse width register; Peak value is used to preserve current pulse generation constantly constantly, current sampling period count value in the latched system when catching end.
And in each pulse capture process, the logical operation of peak value register is: each data of continuous digital pulse signal and the current data of peak value register are compared, if data then latch current data as peak value greater than register data, simultaneously, the current time register also is updated to the current sampling period count value of system.
For reducing the effective output speed of pulse parameter data stream, can keep the maximum dynamic range of system works simultaneously again, the frequency that triggering level takes place in the unit adjustment cycle time by the output pulse carries out negative feedback and adjusts automatically.
Concrete regulating step is as follows: according to the pulse number that records in each cycle current triggering level is regulated, if pulse number reaches the 80%FIFO degree of depth, then triggering level numerical value adds one; If pulse number less than the 5%FIFO degree of depth, is then thought pulse number seldom, triggering level numerical value subtracts one.Each end cycle carries out this regulating step, and the triggering level after the adjusting is carried out pulse parameterization and caught as the triggering level numerical value in new cycle.
The clock generator of acquisition system that this method is used need produce two frequency reference signals simultaneously: low frequency signal is as triggering level adjustment cycle and system cycle counting, typical way is to adopt 1PPS in the lightning monitoring, and in the high-tension apparatus measurement of partial discharge, be typically and adopt work frequency 50PPS or 60PPS.High-frequency signal and low frequency signal homology produce, and strict synchronism and relevant decide according to using required pulse signal frequency scope, and generally press the wave detector bandwidth 3～5 times, typically frequency is 10M～50MHz, is used for analog-to-digital frequency and system time reference.
In the lightning monitoring system, owing to need distributed multistation synchronous, generally adopt GPS to export clock reference synchronously and make clock generator, other need the synchronous occasion of multistation also when so design.
The triggering level of dynamic auto rising can prevent effectively that pulse data stream is saturated, and the triggering level that reduces can guarantee that then system monitoring arrives littler discharge signal automatically.This method is to lightning in the early stage local discharge signal of scope and the early stage cloud in the nature lightning and be used for the thunder and lightning disaster alarm and have very important significance.
In the present embodiment, the output pulse parameter values is meant peak value, the peak value moment and the pulse width of this pulse.
Fig. 1 has illustrated the process of pulse capture as shown in it, to capture the peak amplitude B of pulse
0The time, can earlier this peak lock be existed in the latch.When continuing to capture pulse B peak amplitude, latch can be automatically with this peak value and the peak amplitude B that latchs
0Relatively, find that pulse B peak amplitude is greater than peak amplitude B
0The time, will abandon peak amplitude B
0Again latch pulse B peak amplitude (promptly replaces peak amplitude B with pulse B peak amplitude in latch
0), and the peak value moment B of while recording impulse B peak amplitude correspondence.Pulse width is in the process that pulsatile once is caught the AD clock to be counted gained by pulse width counter.Data begin counting when surpassing triggering level, last till that the last data finish when being lower than triggering level.The triggering level adjustment cycle then is by period counter the 1PPS of clock generator output or the signal-count of 50PPS to be obtained.In each pulse capture process, the automatic adjustment of triggering level all is the finish times that betide adjustment cycle.As shown in Figure 1, because the frequency of pulse generation is higher than upper limit threshold in the unit adjustment cycle time, triggering level was raised automatically in the finish time of adjustment cycle N.And the frequency of N+1 interior pulse generation of unit adjustment cycle time is lower than lower threshold, and then triggering level reduced automatically in the finish time of adjustment cycle N+1.
Claims (6)
1, the parameter acquisition method of discharging radiation pulse is characterized in that, comprises the steps:
A. the discharging radiation pulse signal that receives is carried out detection and is converted to continuous digital pulse signal, then digital pulse signal and triggering level are compared, be higher than the acquisition procedure that triggering level then begins a pulse, be lower than triggering level and then stop this process, and export the pulse parameter values that the pulse capture process record arrives simultaneously;
B. triggering level is carried out negative feedback according to the pulse generation frequency in the unit adjustment cycle and is adjusted automatically.
2, the parameter acquisition method of discharging radiation pulse according to claim 1 is characterized in that, among the described step a, the pulse parameter values of output is meant that the peak amplitude of this pulse, peak value are constantly and pulse width.
3, the parameter acquisition method of discharging radiation pulse according to claim 1, it is characterized in that, among the described step a, in each pulse capture process, each data and the current data in the peak value register of continuous digital pulse signal are compared, then latch current data as peak value as if data greater than the peak value register data, simultaneously the current moment being deposited is the peak value moment.
4, the parameter acquisition method of discharging radiation pulse according to claim 1, it is characterized in that, among the described step a, pulse width register zero clearing when pulse capture begins, in acquisition procedure, the sampling period is counted, end is caught in pulse when digital pulse signal is lower than triggering level, the pulse width that the value of latch pulse width register is obtained as this acquisition procedure.
5, the parameter acquisition method of discharging radiation pulse according to claim 1, it is characterized in that, the negative feedback self-regulating process of triggering level is among the described step b: according to the pulse number that records in each adjustment cycle current triggering level is adjusted, even pulse number reaches upper limit threshold, and then triggering level improves a numerical value unit; If pulse number is less than lower threshold, then triggering level reduces a numerical value unit, and each adjustment cycle carries out this set-up procedure when finishing, and adjusted triggering level is as the triggering level numerical value in new cycle.
6, the parameter acquisition method of discharging radiation pulse according to claim 1 is characterized in that, among the described step a, the pulse parameter values of output is meant that the peak amplitude of this pulse, peak value are constantly and pulse width; The zero clearing of pulse width register was counted the sampling period in acquisition procedure when pulse capture began, and end is caught in pulse when digital pulse signal is lower than triggering level, the pulse width that the value of latch pulse width register is obtained as this acquisition procedure; In each pulse capture process, with each data and the comparison of the current data in the peak value register of continuous digital pulse signal, if data then latch current data as peak value greater than the peak value register data, simultaneously the current moment being deposited is the peak value moment;
The negative feedback self-regulating process of triggering level is among the described step step b: according to the pulse number that records in each adjustment cycle current triggering level is adjusted, even pulse number reaches upper limit threshold, and then triggering level improves a numerical value unit; If pulse number is less than lower threshold, then triggering level reduces a numerical value unit, and each adjustment cycle carries out this set-up procedure when finishing, and adjusted triggering level is as the triggering level numerical value in new cycle.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103869123A (en) * | 2012-12-14 | 2014-06-18 | 北京普源精电科技有限公司 | Oscilloscope with pulse width measurement function |
| CN103941104A (en) * | 2014-04-11 | 2014-07-23 | 北京中铭恒盛科技有限公司 | Method for recognizing symmetric waveform crests |
| CN105229478A (en) * | 2013-05-21 | 2016-01-06 | Zf腓德烈斯哈芬股份公司 | For assessment of the Method and circuits of pulse-width signal |
| WO2016004687A1 (en) * | 2014-07-07 | 2016-01-14 | 国家电网公司 | Method for distinguishing initial time point of ultra-high-frequency partial discharge signal |
| CN107272049A (en) * | 2017-07-13 | 2017-10-20 | 成都理工大学 | Digital n γ discriminating methods based on pulse width |
| CN107544005A (en) * | 2017-07-19 | 2018-01-05 | 华北电力大学 | A kind of determination method and apparatus of high pressure IGBT shelf depreciation electric current time domain parameter |
| CN108627743A (en) * | 2018-05-15 | 2018-10-09 | 国网江苏省电力有限公司电力科学研究院 | A kind of lossless method for catching of shelf depreciation nanosecond narrow pulse sequence |
| CN108732398A (en) * | 2017-04-14 | 2018-11-02 | 特克特朗尼克公司 | Simulation transformation storage |
| CN109765434A (en) * | 2019-02-22 | 2019-05-17 | 北京遥感设备研究所 | A kind of pulse signal pulse width measure device using ratio threshold judgement |
| CN112636721A (en) * | 2020-12-01 | 2021-04-09 | 西安现代控制技术研究所 | Variable interval laser narrow pulse combined capturing system and method |
| CN116473662A (en) * | 2023-04-18 | 2023-07-25 | 上海玮启医疗器械有限公司 | Pulse ablation impedance detection method based on FPGA |
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- 2008-06-11 CN CN2008100446727A patent/CN101303377B/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103869123A (en) * | 2012-12-14 | 2014-06-18 | 北京普源精电科技有限公司 | Oscilloscope with pulse width measurement function |
| CN105229478A (en) * | 2013-05-21 | 2016-01-06 | Zf腓德烈斯哈芬股份公司 | For assessment of the Method and circuits of pulse-width signal |
| CN103941104A (en) * | 2014-04-11 | 2014-07-23 | 北京中铭恒盛科技有限公司 | Method for recognizing symmetric waveform crests |
| WO2016004687A1 (en) * | 2014-07-07 | 2016-01-14 | 国家电网公司 | Method for distinguishing initial time point of ultra-high-frequency partial discharge signal |
| CN108732398A (en) * | 2017-04-14 | 2018-11-02 | 特克特朗尼克公司 | Simulation transformation storage |
| CN108732398B (en) * | 2017-04-14 | 2022-04-26 | 特克特朗尼克公司 | Analog transition storage |
| CN107272049A (en) * | 2017-07-13 | 2017-10-20 | 成都理工大学 | Digital n γ discriminating methods based on pulse width |
| CN107544005B (en) * | 2017-07-19 | 2020-07-10 | 华北电力大学 | Method and device for determining time domain parameters of partial discharge current of high-voltage IGBT (insulated Gate Bipolar transistor) |
| CN107544005A (en) * | 2017-07-19 | 2018-01-05 | 华北电力大学 | A kind of determination method and apparatus of high pressure IGBT shelf depreciation electric current time domain parameter |
| CN108627743A (en) * | 2018-05-15 | 2018-10-09 | 国网江苏省电力有限公司电力科学研究院 | A kind of lossless method for catching of shelf depreciation nanosecond narrow pulse sequence |
| CN109765434A (en) * | 2019-02-22 | 2019-05-17 | 北京遥感设备研究所 | A kind of pulse signal pulse width measure device using ratio threshold judgement |
| CN112636721A (en) * | 2020-12-01 | 2021-04-09 | 西安现代控制技术研究所 | Variable interval laser narrow pulse combined capturing system and method |
| CN112636721B (en) * | 2020-12-01 | 2024-03-15 | 西安现代控制技术研究所 | Variable-interval laser narrow pulse combined capturing system and method |
| CN116473662A (en) * | 2023-04-18 | 2023-07-25 | 上海玮启医疗器械有限公司 | Pulse ablation impedance detection method based on FPGA |
| CN116473662B (en) * | 2023-04-18 | 2024-04-09 | 上海玮启医疗器械有限公司 | Pulse ablation impedance detection method based on FPGA |
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