CN108512722A - A kind of multi-stage digital bus control system phase-frequency characteristic measurement optimization method - Google Patents
A kind of multi-stage digital bus control system phase-frequency characteristic measurement optimization method Download PDFInfo
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- CN108512722A CN108512722A CN201810204385.1A CN201810204385A CN108512722A CN 108512722 A CN108512722 A CN 108512722A CN 201810204385 A CN201810204385 A CN 201810204385A CN 108512722 A CN108512722 A CN 108512722A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
- H04L43/0847—Transmission error
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40241—Flexray
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Abstract
The invention discloses a kind of multi-stage digital bus control system phase-frequency characteristics to measure optimization method.This method includes：The pumping signal transmitted by multi-stage digital bus communication and the corresponding response signal of the pumping signal are obtained, and calculates the time warping value Δ t of the pumping signal and response signal；Using correlation analysis algorithm, pumping signal and response signal are handled, obtain preliminary phase-frequency characteristic of the control system to be measured at preset angular frequency point wAccording to time warping value Δ t and angular frequency point w, preliminary phase-frequency characteristic is calculatedErrorUtilize preliminary phase-frequency characteristicAnd errorCalculate the phase-frequency characteristic of control system to be measuredThe present invention realizes the purpose for improving multi-stage digital bus control system phase-frequency characteristic accuracy of measurement.
Description
Technical field
The present invention relates to phase-frequency characteristic measuring technique more particularly to a kind of multi-stage digital bus control system phase frequency are special
Property measure optimization method.
Background technology
With being constantly progressive for China's Aerospace Products Development Level, Mechatronic control system is gradually to digitlization, module
Change and web development, form open electromechanical network control system architecture, promote number bus control system
And its development of measuring technique.When testing digital bus control system, because digital bus transfer time delay, control layer with
The reasons such as communication layers asynchronous controlling will produce the timing skew of pumping signal and feedback signal.Currently, number bus control system
When carrying out phase-frequency characteristic measurement, the timing skew of pumping signal and response signal is had ignored, to which phase frequency can be influenced
The measurement accuracy of rate characteristic.When number bus control system level quantity gradually increases, deposited between pumping signal and response signal
Influence of the timing skew to phase-frequency characteristic measurement accuracy also can gradually aggravate.
Invention content
Present invention solves the technical problem that being：Compared with the prior art, a kind of multi-stage digital bus control system is provided
Phase-frequency characteristic measures optimization method, realizes and improves multi-stage digital bus control system phase-frequency characteristic accuracy of measurement
Purpose.
The above-mentioned purpose of the present invention is achieved by the following technical programs：
A kind of multi-stage digital bus control system phase-frequency characteristic measurement optimization method, including：
It obtains the pumping signal transmitted by multi-stage digital bus communication and the corresponding response of the pumping signal is believed
Number, and calculate the time warping value Δ t of the pumping signal and response signal；
Using correlation analysis algorithm, pumping signal and response signal are handled, obtain control system to be measured default
Angular frequency point w at preliminary phase-frequency characteristic
According to time warping value Δ t and angular frequency point w, preliminary phase-frequency characteristic is calculatedError
Utilize preliminary phase-frequency characteristicAnd errorCalculate the phase-frequency characteristic of control system to be measured
Further, the time warping value Δ t of the pumping signal and response signal is calculated, including：
Setting moment of the TT＆C system within i-th of frame period, by multi-stage digital bus communication by pumping signal x (i)
It is issued to control system to be measured；The corresponding numerical value of frame count flag bit of the pumping signal x (i) is i, wherein i is just whole
Number；
Obtain the frame cycle T of TT＆C systemIt surveysWith the sampling period T of control system to be measuredIt adopts, according to the frame cycle TIt surveysAnd institute
State sampling period TIt adopts, calculate pumping signal x (i) and repeat number K in control system to be measured；
After control system to be measured receives pumping signal x (i), the corresponding response signal y of the pumping signal x (i) is generated
(i+k/K), and by the record flag bit of the response signal y (i+k/K) it is set as the numerical value i, and the response is believed
The setting value of the number flag bit of number y (i+k/K) is k；Then the sound of record flag bit and the setting of number flag bit will be completed
Induction signal y (i+k/K) is back to TT＆C system；
TT＆C system receives the response signal y for completing record flag bit and the setting of number flag bit j-th of frame period
(i+k/K), the record mark bit value i and number mark bit value k of the response signal y (i+k/K) are identified, and transfers jth
The corresponding numerical value j of frame count flag bit of the pumping signal x (j) generated in a frame period；Wherein, i<i+k/K<j；
The record mark bit value i of signal y (i+k/K), number mark bit value k, pumping signal x (j) according to response
The corresponding numerical value j of frame count flag bit and it is described repeat number K, calculate the response signal y in j-th of frame period
(i+k/K) and the timing skew value n of pumping signal x (j)；
According to the frame cycle T of timing skew value n and TT＆C systemIt surveys, calculate response signal y (i+k/K) and pumping signal x
(j) time warping value Δ t.
Further, the calculation formula for repeating number K is：
K=TIt surveys/TIt adopts。
Further, the calculation formula of the timing skew value n is：
N=j-i-k/K.
Further, the calculation formula of the time warping value Δ t is：
Δ t=n × TIt surveys。
Further, the preliminary phase-frequency characteristicErrorCalculation formula be：
Further, the phase-frequency characteristicCalculation formula be：
The present invention has the advantages that compared with prior art：
(1) present invention is encouraged when being measured to multi-stage digital bus control system phase-frequency characteristic by calculating
The time warping value Δ t of signal and response signal, fully considers time warping value Δ t for phase-frequency characteristic accuracy of measurement
Influence, to improve multi-stage digital bus control system phase-frequency characteristic accuracy of measurement.
(2) present invention is not increasing any hardware when calculating the time warping value Δ t of pumping signal and response signal
In the case of, it, can On-line sampling system difference response message and excitation by the way that flag bit is added in stimulus messages and response message
The time warping value of message, so as to carry out different accurate compensation to different test objects.
(3) present invention is eliminated by the time warping value of calculating pumping signal and response signal in the prior art because of number
Network transfer delay, control layer and communication layers asynchronous controlling that bus communication is brought and cause between pumping signal and response signal
Timing skew realizes the accurate compensation of frequency characteristic, improves the measuring accuracy of frequency characteristic.
Description of the drawings
Fig. 1 is that a kind of multi-stage digital bus control system phase-frequency characteristic in the embodiment of the present invention measures optimization method
Flow chart.
Fig. 2 is the two-stage digital bus control system data transmission flow schematic diagram in the embodiment of the present invention.
Fig. 3 is the two-stage digital bus control system signal sequence instance graph in the embodiment of the present invention.
Specific implementation mode
Invention is further described in detail with reference to the accompanying drawings and examples.It is understood that described herein
Specific embodiment be used only for explain the present invention rather than limitation of the invention.It also should be noted that for the ease of
It describes, only the parts related to the present invention are shown rather than entire infrastructure in attached drawing.
Fig. 1 is that a kind of multi-stage digital bus control system phase-frequency characteristic in the embodiment of the present invention measures optimization method
Flow chart.With reference to figure 1, multi-stage digital bus control system phase-frequency characteristic provided in this embodiment measures optimization method tool
Body may include steps of：
S110, the pumping signal transmitted by multi-stage digital bus communication and the corresponding sound of the pumping signal are obtained
Induction signal, and calculate the time warping value Δ t of the pumping signal and response signal.
Specifically, calculating the time warping value Δ t of the pumping signal and response signal, may include：
Setting moment of the TT＆C system within i-th of frame period, by multi-stage digital bus communication by pumping signal x (i)
It is issued to control system to be measured；The corresponding numerical value of frame count flag bit of the pumping signal x (i) is i, wherein i is just whole
Number.
Obtain the frame cycle T of TT＆C systemIt surveysWith the sampling period T of control system to be measuredIt adopts, according to the frame cycle TIt surveysAnd institute
State sampling period TIt adopts, calculate pumping signal x (i) and repeat number K in control system to be measured.Wherein, the repetition is held
The calculation formula of places number K is：
K=TIt surveys/TIt adopts。
After control system to be measured receives pumping signal x (i), the corresponding response signal y of the pumping signal x (i) is generated
(i+k/K), and by the record flag bit of the response signal y (i+k/K) it is set as the numerical value i, and the response is believed
The setting value of the number flag bit of number y (i+k/K) is k；Then the sound of record flag bit and the setting of number flag bit will be completed
Induction signal y (i+k/K) is back to TT＆C system；
TT＆C system receives the response signal y for completing record flag bit and the setting of number flag bit j-th of frame period
(i+k/K), the record mark bit value i and number mark bit value k of the response signal y (i+k/K) are identified, and transfers jth
The corresponding numerical value j of frame count flag bit of the pumping signal x (j) generated in a frame period；Wherein, i<i+k/K<j；
The record mark bit value i of signal y (i+k/K), number mark bit value k, pumping signal x (j) according to response
The corresponding numerical value j of frame count flag bit and it is described repeat number K, calculate the response signal y in j-th of frame period
(i+k/K) and the timing skew value n of pumping signal x (j).Wherein, the calculation formula of the timing skew value n is：
N=j-i-k/K.
According to the frame cycle T of timing skew value n and TT＆C systemIt surveys, calculate response signal y (i+k/K) and pumping signal x
(j) time warping value Δ t.Wherein, the calculation formula of the time warping value Δ t is：
Δ t=n × TIt surveys。
It is illustrated by taking two-stage digital bus control system as an example.Fig. 2 is the two-stage digital bus in the embodiment of the present invention
Control system data transmission flow schematic diagram.Whole system is divided into three external bus layer, internal bus layer, control layer functional layers, outside
Bus layer completes the information exchange of two-stage digital bus control system and TT＆C system, and internal bus layer completes the total line traffic control of two-stage digital
Main control unit carries out motor closed-loop control with multiple information exchanges from control unit, control layer in system processed, completes mechanism action.
External bus described in this implementation use-case uses 1553B buses, the internal bus to use Flexray buses, wherein two-stage digital total
Main control unit in line control system is provided simultaneously with 1553B interfaces and Flexray interfaces, has Flexray interfaces from control unit
With drive and control of electric machine ability.
Using above-mentioned two-stage digital bus control system as test object, TT＆C system mainly complete pumping signal issue and
Two class of passback of response signal is periodically transmitted.The data transmission procedure that pumping signal issues is as shown in Fig. 2, TT＆C system is given birth to
Pumping signal is broadcasted to the 1553B interfaces of main control unit at pumping signal, and by the 1553B interfaces of TT＆C system；Master control
After the 1553B interfaces to pumping signal of unit, the transmission variable of its Flexray interface is updated；The Flexray of main control unit
Interface waits until planning call duration time, and newer pumping signal is broadcasted to the Flexray interfaces from control unit；From control unit
Flexray interfaces update the excitation variable of control winding after receiving pumping signal, carry out closed-loop control, have been finally completed excitation
Signal issues.
The data transmission procedure of response signal passback from control unit as shown in Fig. 2, respectively complete the acquisition of response signal, and more
The transmission variable of new Flexray interfaces；Respectively respective planning call duration time is waited until from control unit F lexray interfaces, pass through
Newer response signal is sent to the Flexray interfaces of main control unit by Flexray interfaces；The Flexray interfaces of main control unit
The transmission variable in its 1553B interface is updated after receiving response signal；The 1553B interfaces of main control unit wait until planning communication
Newer response signal is sent to the 1553B interfaces of TT＆C system, is finally completed the passback of response signal by the time.
Because of digital bus transfer time delay, control layer and communication layers asynchronous controlling so that pumping signal is generated with its correspondence
Response signal produces timing skew.Existing timing skew measures essence to phase-frequency characteristic between pumping signal and response signal
Degree produces influence.The embodiment of the present invention calculates pumping signal and response signal on the basis of any hardware of no increase
Time warping value Δ t.The message for carrying pumping signal is known as stimulus messages, and the message referred to as response for carrying response signal disappears
Breath.
Fig. 3 is the two-stage digital bus control system signal sequence instance graph in the embodiment of the present invention.In stimulus messages
Choosing one of data word as flag bit i, this flag bit i there is the meaning of frame count, i.e. TT＆C system to generate simultaneously
When pumping signal, gradually increase since 1, records the sequence of pumping signal in each message.Meanwhile it choosing in the response message
Two data words, one of data word is as record flag bit, by recording in control layer based on the frame of implemented pumping signal
Number flag bit i, the number that another data word is executed as number flag bit k, for recording pumping signal in control layer.
Obtain the frame cycle T of TT＆C systemIt surveysFor the sampling period T of 1ms and secondary bus control system to be measuredIt adoptsFor 0.2ms,
According to the frame cycle TIt surveysWith the sampling period TIt adopts, calculate pumping signal x (i) repeating time in control system to be measured
Number K is 5.
Setting moment of the TT＆C system within i-th of frame period, i.e. t0Moment passes through pumping signal x (i) successively
1553B bus layers, the transmission of Flexray bus layers, are issued to the control layer of secondary bus control system to be measured；The pumping signal
The corresponding numerical value of frame count flag bit of x (i) is i, wherein i is positive integer.
Secondary bus control system to be measured from control unit in t1To pumping signal x (i), control layer waits for reception
To nearest controlling cycle moment, i.e. t2Moment implements received pumping signal x (i), and in sampling instant life later
At corresponding response signal sequences y (i+k/K) (k=0,1...K-1).By the record flag bit of the response signal y (i+k/K)
It is set as the numerical value i, and by the setting value of the number flag bit of the response signal y (i+k/K) is k.
Secondary bus control system waits until Flexray bus layer network planning moment t4It is advised with 1553B bus layer networks
Draw moment t5, the response signal y (i+k/K) for completing record flag bit and the setting of number flag bit is back to TT＆C system；Institute
It is distance passback t to return response signal y (i+k/K)4Response signal, i.e. response signal caused by nearest sampling period at moment
y(i+3/5)。
TT＆C system receives the response signal y for completing record flag bit and the setting of number flag bit j-th of frame period
(i+3/5), wherein j=i+2 identifies the record mark bit value i and number mark bit value k of the response signal y (i+3/5)
=3, and transfer the corresponding numerical value j of frame count flag bit of the pumping signal x (j) generated in j-th of frame period；Wherein, i<i+
k/K<j。
The record mark bit value i of signal y (i+3/5), number mark bit value k=3, pumping signal x (j) according to response
The corresponding numerical value j=i+2 of frame count flag bit and it is described repeat number K=5, calculate in j-th of frame period
The timing skew value n=1.4 of response signal y (i+k/K) and pumping signal x (j).
According to the frame cycle T of timing skew value n and TT＆C systemIt surveys, calculate response signal y (i+k/K) and pumping signal x
(j) time warping value Δ t=nTIt surveys=1.4ms.
S120, using correlation analysis algorithm, pumping signal and response signal are handled, control system to be measured is obtained and exists
Preliminary phase-frequency characteristic at preset angular frequency point w
S130, according to time warping value Δ t and angular frequency point w, calculate preliminary phase-frequency characteristicError
Specifically, the preliminary phase-frequency characteristicErrorCalculation formula be：
Time warping value Δ t=based on the calculated response signal y (i+k/K) of step S110 and pumping signal x (j)
nTIt surveys=1.4ms, it can be deduced that angular frequency point w and errorCorrespondence situation, as described in Table 1.
Table 1：Angular frequency point w and errorCorresponding table
S140, preliminary phase-frequency characteristic is utilizedAnd errorCalculate the phase frequency of control system to be measured
Characteristic
Specifically, the phase-frequency characteristicCalculation formula be：
The technical solution of the present embodiment, can be real online by way of flag bit is added in stimulus messages and response message
When measure the time warping values of different response messages and stimulus messages, to solve in the prior art because digital bus communications bring net
Network propagation delay time, control layer and communication layers asynchronous controlling and cause signal sequence to misplace, realize the accurate compensation of frequency characteristic,
Improve the measuring accuracy of frequency characteristic.
Note that above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiments described here, can carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out to the present invention by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
May include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (7)
1. a kind of multi-stage digital bus control system phase-frequency characteristic measures optimization method, which is characterized in that including：
The pumping signal transmitted by multi-stage digital bus communication and the corresponding response signal of the pumping signal are obtained, and
Calculate the time warping value Δ t of the pumping signal and response signal；
Using correlation analysis algorithm, pumping signal and response signal are handled, obtain control system to be measured at preset angle
Preliminary phase-frequency characteristic at Frequency point w
According to time warping value Δ t and angular frequency point w, preliminary phase-frequency characteristic is calculatedError
Utilize preliminary phase-frequency characteristicAnd errorCalculate the phase-frequency characteristic of control system to be measured
2. multi-stage digital bus control system phase-frequency characteristic according to claim 1 measures optimization method, feature
It is, calculates the time warping value Δ t of the pumping signal and response signal, including：
Setting moment of the TT＆C system within i-th of frame period is issued pumping signal x (i) by multi-stage digital bus communication
To control system to be measured；The corresponding numerical value of frame count flag bit of the pumping signal x (i) is i, wherein i is positive integer；
Obtain the frame cycle T of TT＆C systemIt surveysWith the sampling period T of control system to be measuredIt adopts, according to the frame cycle TIt surveysIt is adopted with described
Sample cycle TIt adopts, calculate pumping signal x (i) and repeat number K in control system to be measured；
After control system to be measured receives pumping signal x (i), the corresponding response signal y (i+k/ of the pumping signal x (i) are generated
K), and by the record flag bit of the response signal y (i+k/K) it is set as the numerical value i, and by the response signal y (i+
K/K the setting value of number flag bit) is k；Then the response signal y of record flag bit and the setting of number flag bit will be completed
(i+k/K) it is back to TT＆C system；
TT＆C system receives the response signal y (i+k/ for completing record flag bit and the setting of number flag bit j-th of frame period
K), identify the record mark bit value i and number mark bit value k of the response signal y (i+k/K), and transfer j-th of frame week
The corresponding numerical value j of frame count flag bit of the pumping signal x (j) generated in phase；Wherein, i<i+k/K<j；
The frame meter of the record mark bit value i of signal y (i+k/K), number mark bit value k, pumping signal x (j) according to response
The corresponding numerical value j of number flag bit and it is described repeat number K, calculate the response signal y (i+k/ in j-th of frame period
) and the timing skew value n of pumping signal x (j) K；
According to the frame cycle T of timing skew value n and TT＆C systemIt surveys, calculate response signal y's (i+k/K) and pumping signal x (j)
Time warping value Δ t.
3. multi-stage digital bus control system phase-frequency characteristic according to claim 2 measures optimization method, feature
It is, the calculation formula for repeating number K is：
K=TIt surveys/TIt adopts。
4. multi-stage digital bus control system phase-frequency characteristic according to claim 2 measures optimization method, feature
It is, the calculation formula of the timing skew value n is：
N=j-i-k/K.
5. multi-stage digital bus control system phase-frequency characteristic according to claim 2 measures optimization method, feature
It is, the calculation formula of the time warping value Δ t is：
Δ t=n × TIt surveys。
6. multi-stage digital bus control system phase-frequency characteristic according to claim 1 measures optimization method, feature
It is, the preliminary phase-frequency characteristicErrorCalculation formula be：
7. multi-stage digital bus control system phase-frequency characteristic according to claim 1 measures optimization method, feature
It is, the phase-frequency characteristicCalculation formula be：
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