CN108427039A - Pulse-amplitude modulation signal pulse width measurement method based on ratio thresholding - Google Patents
Pulse-amplitude modulation signal pulse width measurement method based on ratio thresholding Download PDFInfo
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- CN108427039A CN108427039A CN201810524684.3A CN201810524684A CN108427039A CN 108427039 A CN108427039 A CN 108427039A CN 201810524684 A CN201810524684 A CN 201810524684A CN 108427039 A CN108427039 A CN 108427039A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
- G01R29/023—Measuring pulse width
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Abstract
The pulse-amplitude modulation signal pulse width measurement method based on ratio thresholding that the present invention is to provide a kind of.One：Determine the initial threshold u of initial measurement pulsewidthk1；Two：From initial threshold uk1Start search for non-coherent demodulation after signal envelope maximum value umax；Three：By signal envelope maximum value umaxIt is multiplied by the result u of ratio thresholding δk2As the optimum thresholding for measuring pulsewidth；Four：Use calculated optimum measurement thresholding uk2To measure pulse width；Five：Compared with the pulsewidth of baseband digital signal, judge whether to meet termination criteria, if meeting termination criteria, stops measuring, export optimal measurement result；Otherwise, the numerical value of thresholding of more rescaling repeats step 2 to step 5.The present invention can be avoided the not precipitous influence brought of porch to the greatest extent, can rapidly and accurately be measured the pulse width of ASK modulated signals with the size of dynamic adjusted threshold ratio.
Description
Technical field
The present invention relates to a kind of specifically a kind of modulated signal pulse width measuring methods of signal processing method.
Background technology
Pulse width parameter tool has very important significance, and in the environment of becoming increasingly complex, it not only reflects radar sheet
The Range resolution performance of body, also reflects whether radar itself implies complicated modulation, meanwhile, pulsewidth is also Discrimination Radar
One-dimensional important parameter.In actual measurement, due to being influenced by sample frequency and measurement method, lead to the measurement essence of pulsewidth
It spends poor.Currently, the measurement for pulsewidth mainly uses following three kinds of methods：
(1) maximum value of pulse width measure value is chosen；
(2) second largest value of pulse width measure value is chosen；
(3) average value of pulsewidth is chosen.
Three of the above method only on relative meaning for be stable, but in current signal processing technology field
In, it is undesirable according to the above criterion measurement accuracy by the constraint of time of measuring.
When measuring the pulsewidth of ASK signals using non-coherent demodulation method, there are sides for the signal envelope exported due to filter
Along not precipitous problem, lead to pulse width measure low precision.
Invention content
Porch can be avoided not precipitous with the size of dynamic adjusted threshold ratio the purpose of the present invention is to provide a kind of
The pulse-amplitude modulation signal pulse width measurement method based on ratio thresholding of the influence brought.
The object of the present invention is achieved like this：
Step 1：Determine the initial threshold u of initial measurement pulsewidthk1；
Step 2：From initial threshold uk1Start search for non-coherent demodulation after signal envelope maximum value umax；
Step 3：By signal envelope maximum value umaxIt is multiplied by the result u of ratio thresholding δk2As the best door for measuring pulsewidth
Limit；
Step 4：Use calculated optimum measurement thresholding uk2To measure pulse width；
Step 5：Compared with the pulsewidth of baseband digital signal, judge whether to meet termination criteria, if meeting termination criteria,
Then stop measuring, exports optimal measurement result；Otherwise, the numerical value of thresholding of more rescaling repeats step 2 to step 5.
The present invention can also include：
1, described from from initial threshold uk1Start search for non-coherent demodulation after signal envelope maximum value umaxSpecific packet
It includes：From initial threshold uk1In a pulse width, the envelope increment Delta y using signal divided by corresponding sampling interval increment
Δ x obtains the slope k of a signal envelope herein, constantly reduces with the value of slope k, when the numerical value of k level off to 0 when, then recognize
Maximum value is reached approximately for signal envelope at this time, several sampled points when by slope approach 0 are averaged, with this average value
Maximum value u as demodulated signal envelopemax。
2, the value that should initially choose ratio thresholding δ is 0.5.
When measuring the pulsewidth of ASK signals using non-coherent demodulation method, there are sides for the signal envelope exported due to filter
Along not precipitous problem, lead to pulse width measure low precision.Therefore it is directed to this problem, the present invention proposes a kind of based on ratio door
The ASK modulated signal pulse width measuring methods of limit, can avoid pulse to the greatest extent with the size of dynamic adjusted threshold ratio
The not precipitous influence brought in edge, can rapidly and accurately measure the pulse width of ASK modulated signals.
The ASK modulated signal pulse width measuring methods based on ratio thresholding of the present invention, for using non-coherent demodulation
Method being based on ratio to the pulse width measuring of pulse-amplitude modulation (ASK) signal by founding mathematical models and using a kind of
The method of thresholding measures pulse width.
The invention has the advantages that：(1) edge of pulse caused by the non-coherent demodulation mode of ASK modulated signals can be overcome
The influence measured along not precipitous pulse-width, effectively increases measurement accuracy；(2) signal envelope after non-coherent demodulation is utilized
Maximum value is multiplied by ratio thresholding and finds out the optimum thresholding for measuring pulsewidth, with measuring speed is fast, precision is high, avoids being absorbed in part most
Excellent many advantages；(3) overcoming traditional multiple measurement takes arithmetic mean method precision low, while needing a large amount of memory spaces
A series of problems, such as.
Description of the drawings
Fig. 1 is the ASK modulated signal pulse width measuring method flow schematic diagrams based on ratio thresholding of the present invention.
Fig. 2 be how to search for non-coherent demodulation after signal envelope maximum value schematic diagram.
Fig. 3 is the signal that the present invention measures proportion of utilization thresholding after ASK modulated signal non-coherent demodulations pulsewidth
Figure.
Specific implementation mode
It illustrates below and the present invention is described in more detail.
The present invention provides a kind of measurement method of the ASK modulated signal non-coherent demodulation pulse widths based on ratio thresholding,
Realization rapidly and accurately measures ASK modulated signal pulse widths in engineering field.Since traditional method is to utilize repeatedly survey
Amount is averaging or takes the second largest value of measurement data, needs a large amount of memory spaces, and generate delay.And at present in actual work
It needs fast and accurately to carry out pulse width measure in journey field, requirement of real-time is high.The present invention proposes only to need storing initial door thus
Limit value uk1, ratio threshold delta, signal envelope maximum value umaxMethod to measure, by the way that measurement pulsewidth is calculated
Required optimum thresholding realizes the fast and accurately pulse width measure in engineering to measure.
Holistic approach schematic diagram is as shown in Figure 1, specifically include following steps：
Step 1：Determine the initial threshold u of initial measurement pulsewidthk1。
First, the initial threshold u of initial measurement pulsewidth is determinedk1.In ASK modulation demodulation systems, due to using non-phase
Dry demodulation mode leads to the not precipitous of porch, to influence the measurement of pulse width.Therefore, we choose a letter first
Number range value as initial measurement thresholding uk1.Although pulse width can be measured at this time, missed compared with actual numerical value
Difference is larger.
Step 2：From uk1Start search for non-coherent demodulation after signal envelope maximum value umax。
The initial threshold u of initial measurement pulsewidthk1Size has determined.From initial threshold uk1In a pulse width
It is interior, it can then obtain a signal envelope herein using the envelope increment Delta y divided by corresponding sampling interval increment Delta x of signal
Slope k.Constantly reduce with the value of slope k, when the numerical value of k level off to 0 when, it may be considered that signal envelope approximation at this time reaches
To maximum value.But since the concussion near signal envelope maximum value is floated, several sampled points when by slope approach 0 are made even
Mean value, using this average value as the maximum value u of demodulated signal envelopemax.Specific signal is as shown in Figure 3.
Step 3：By signal envelope maximum value umaxIt is multiplied by the result u of ratio thresholding δk2As the best door for measuring pulsewidth
Limit.
Measurement thresholding corresponding to the actual pulse width of signal, it should in uk1With the maximum value u of signal envelopemaxBetween.
Therefore the present invention devises ratio threshold delta this parameter.Selection for ratio threshold value should initially choose 0.5 or so.It will
The demodulated signal envelope maximum value u found out in step 2maxRatio threshold delta is multiplied by as the optimum thresholding u for measuring pulsewidthk2。
Step 4：Use optimum measurement thresholding u calculated in step 3k2The pulse width of measuring signal.
According to optimum measurement thresholding u calculated in step 3k2To measure the pulse after ASK modulated signal non-coherent demodulations
Width, two sampled point M can be obtained in a pulse width by thus measuring thresholding1、M2.Then (M2-M1) * μ obtain be exactly
The pulse width of signal, wherein μ are the sampling interval.Specific instrumentation plan is as shown in Figure 3.
Step 5：Judge whether measurement result meets condition.
Measurement result judges whether to meet termination criteria compared with the pulsewidth of baseband digital signal, if meeting termination criteria,
Then stop measuring and exports optimal measurement result；Otherwise, the size for readjusting ratio thresholding measures, and repeats step 3 and arrives
Step 5.
Claims (3)
1. a kind of pulse-amplitude modulation signal pulse width measurement method based on ratio thresholding, it is characterized in that：
Step 1：Determine the initial threshold u of initial measurement pulsewidthk1；
Step 2：From initial threshold uk1Start search for non-coherent demodulation after signal envelope maximum value umax；
Step 3：By signal envelope maximum value umaxIt is multiplied by the result u of ratio thresholding δk2As the optimum thresholding for measuring pulsewidth；
Step 4：Use calculated optimum measurement thresholding uk2To measure pulse width；
Step 5：Compared with the pulsewidth of baseband digital signal, judge whether to meet termination criteria, if meeting termination criteria, stop
It only measures, exports optimal measurement result；Otherwise, the numerical value of thresholding of more rescaling repeats step 2 to step 5.
2. the pulse-amplitude modulation signal pulse width measurement method according to claim 1 based on ratio thresholding, special
Sign is described from from initial threshold uk1Start search for non-coherent demodulation after signal envelope maximum value umaxIt specifically includes：From first
Beginning threshold value uk1In a pulse width, obtained using the envelope increment Delta y divided by corresponding sampling interval increment Delta x of signal
The slope k of one signal envelope herein, constantly reduces with the value of slope k, when the numerical value of k level off to 0 when, then it is assumed that at this time
Signal envelope reaches approximately maximum value, several sampled points when by slope approach 0 are averaged, using this average value as having solved
Adjust the maximum value u of signal envelopemax。
3. the pulse-amplitude modulation signal pulse width measurement method according to claim 1 or 2 based on ratio thresholding,
It is characterized in：The value that ratio thresholding δ should initially be chosen is 0.5.
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| CN112255467A (en) * | 2019-07-22 | 2021-01-22 | 苏州普镭辰光光电有限公司 | Device and method for measuring arrival time of pulse signal |
| CN114113786A (en) * | 2021-11-19 | 2022-03-01 | 许昌许继软件技术有限公司 | Adaptive key phase pulse acquisition method and system and electronic equipment |
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Cited By (3)
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| CN110082808A (en) * | 2018-11-29 | 2019-08-02 | 绵阳市维博电子有限责任公司 | One kind is based on core pulse signal quick detection and recognition methods under complex background |
| CN112255467A (en) * | 2019-07-22 | 2021-01-22 | 苏州普镭辰光光电有限公司 | Device and method for measuring arrival time of pulse signal |
| CN114113786A (en) * | 2021-11-19 | 2022-03-01 | 许昌许继软件技术有限公司 | Adaptive key phase pulse acquisition method and system and electronic equipment |
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