CN102882624B - PXI/PCI bus-based remote synchronization device of test signal source devices and method thereof - Google Patents
PXI/PCI bus-based remote synchronization device of test signal source devices and method thereof Download PDFInfo
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Abstract
The invention discloses a PXI/PCI bus-based remote synchronization device of test signal source devices and a method thereof. The method comprises the steps as follows: a transmission line with the right type is selected according to the distance between two test devices and the surrounding environment; a proximal signal source device controls a PXI/PCI interface to output a required signal via invoking the simulative output card driving program, and meanwhile outputs a synchronization plus signal; a remote signal source device generates a high-frequency sampling plus signal via a counter on a simulative output card and is equipped with the accouter to work in a plus generation mode via a simulative output card driving program, and a trigger source is a synchronization signal transmitted from a long line; and a synchronization signal transmitted by the proximal signal source device triggers the plus output of the accouter module one time in each period, therefore the proximal source device synchronizes with the remote signal source device one time in each period, and the remote synchronization of test signal source device is achieved. The invention has the advantages of reliability and maturity, the phases of the signals output from the devices are synchronized, and phase error of the signals completely meets satellite test system indexes.
Description
Technical field
The present invention relates to a kind of equipment room remote synchronization method, specifically a kind of testing source equipment room remote synchronization Apparatus and method for based on PXI/PCI bus.
Background technology
Carry out in the imaging test process of large loop, star ground at spin meteorological satellite, when to be set to " in " signal be scan control temporal reference to scan-synchronized device on star, requiring that step signal that the cloud atlas a reference source equipment of ground simulation Nephogram gives satellite exports between earth ripple signal with appearance control station equipment keeps strict phase synchronous, guarantee constant phase difference.This mainly due to: the step signal of each signal period all represents each scan-line data of 2500 row of formation one width cloud atlas, only have each represent scan-line data step signal and ground in signal all keep constant phase relation in each signal period, on star, detection system could export Nephogram data with fixing interval, finally could ensure that the original position of cloud atlas scan line does not misplace, export correct simulation cloud atlas.The step signal sent due to cloud atlas a reference source directly sends into the front-end amplifier of satellite detection system, require that the interference signal comprised in its signal is the least possible, so this equipment distance satellite is very near, and by coaxial cable, signal is sent on star, and appearance control station equipment synchronous is with it arranged between satellite test, both are apart more than 50 meters, and two equipment rooms need to be connected by synchronizing cable, realize synchronous.
The standard synchronisation mechanism provided according to PXI/PCI equipment, mainly the clock reference signal of the equipment needed in two synchronous equipment is imported in other analog output cards or other PXI cabinets by case back plate or aerial lug, this synchronization mechanism, can only realize same PXI control that cabinet internal mold intends between output card synchronous, or the shorter equipment room of distance is synchronous.Synchronous for long distance, because the general frequency of clock signal is all at more than MHz, after Long line transmission, the distortion of clock pulse is very large, causes remote equipment that this clock signal cannot be used to work as its external timing signal, synchronously cannot realize.If reduce the frequency of clock pulse signal on long line, even if signal can pass to remote signaling source device preferably, but due to clock frequency reduction, the hits causing remote signaling source device to output signal must reduce, and the precision of output signal will be had a greatly reduced quality.
Summary of the invention
The present invention is directed to prior art above shortcomings, provide a kind of testing source equipment room remote synchronization Apparatus and method for based on PXI/PCI bus.
The present invention is achieved by the following technical solutions.
Based on a testing source equipment room remote synchronization equipment for PXI/PCI bus, comprise for synchronous near end signal source device and remote signaling source device, connected by signal between described near end signal source device and remote signaling source device;
Preferably, described near end signal source device and remote signaling source device are the virtual instrument equipment adopting standard P XI/PCI bus interface form;
Preferably, described near end signal source device and remote signaling source device are equipped with the standard P XI or pci bus interface analog output card that export for local signal;
Preferably, the analog output card of described remote signaling source device be provided with for generation of high-frequency sampling pulse counter module or be configured with universal counter card.
Preferably, described counter module is the counter card that modulating output clamp carries universal counter or configuration separately; Described counter adopts remote signaling source device plate to carry clock signal as rolling counters forward clock signal.
Preferably, described PXI/PCI highway width is 32, and operating voltage is 3.3V/5.5V, frequency is 33MHz/66MHz, communication between analog output card and main control computer cpu bus is realized by PCI bridge road, and described modulating output is arranged with plate and carries FIFO buffer, and supports DMA transmission mode.
Preferably, described analog output card supporting signal sample frequency is greater than 200KHz, and sampling precision is not less than 12bit, and output voltage range is-10V ~+10V.
Based on a synchronous method for the testing source equipment room remote synchronization equipment of PXI/PCI bus, comprise the following steps:
The first step, selects suitable synchronous transmission of signal line type according to the Distance geometry synchronous transmission line periphery electromagnetic environment between near end signal source device and remote signaling source device;
Second step, the modulating output card driver that near end signal source device calls PXI/PCI interface by programming controls its output near end signal source desired signal, exports the low frequency synchronisation pulse signal of a road and near-end output signal frequency phase-difference integral multiple simultaneously;
3rd step, the synchronizing signal of remote signaling source device with Long line transmission, for external trigger source is by the counter on analog output card or the independent counter card configured, configures counter works in pulse generate pattern by analog output card or counter card driver; Generate the local high-frequency sampling pulse signal needed for analog output card;
4th step, the pulse that synchronizing signal each cycle that near end signal source device is sent into triggers start-stop counter module exports, thus ensure within the signal period, far-end and near-end once synchronously, the signal frequency exported after both sides D/A is changed is consistent, constant phase difference, realizes the remote synchronization of testing source equipment room.
Preferably, in the described first step, the selection principle of synchronous transmission of signal line type is: the distance being less than 50 meters selects ribbon feeder or twisted-pair feeder; The distance being less than 100 meters selects twisted pair transmission line or coaxial shielding line; Be greater than 100 meters and the distance being less than 200 meters uses coaxial shielding line; Described transmission line type is determined by the distortion factor after transmission line with test pulse signal; Touching described originating party formula in described 3rd step is external trigger, and trigger source is the synchronization pulse of Long line transmission.
Preferably, carry out near end signal source device programming procedure in described second step to comprise the steps:
Step 1, according to the maximum sample rate index of analog output card and the upper limit of required generation signal highest frequency determination near end signal source device sampling number, the maximum number of the data point that calculating simulation output card produces, that is:
Wherein, described S
maxfor the maximum sample rate that analog output card has, f
maxfor the highest frequency of required generation signal;
Step 2, according to the maximum number of step 1 established data point, calculates the sampled point data amount check that actual D/A changes, that is:
n
s≤X n
max；
Wherein, described X is sampling number;
Step 3, the sampled point data amount check determined according to step 2 and required generation signal frequency, the sample frequency during work of calculating simulation output card, that is:
f
s＝n
sf
signal；
Wherein, f
signalfor required generation signal frequency;
Step 4, generates signal frequency f according to step 3 is required
signal, determine the frequency of synchronizing signal, make the frequency of synchronizing signal be required generation signal frequency f
signal1/n.
Preferably, in described step 2, sampling number is 70% ~ 80% of the maximum number of data point;
Preferably, described sampling number is 75% of the maximum number of data point;
Preferably, in described step 4, n is for dividing exactly f
signalinteger, and to be determined by actual test according to the distance between synchronizer.
Preferably, carry out near end signal source device programming procedure in described 3rd step to comprise the steps:
Step 1, adopts the sampling number n of the method determination remote signaling source device local signal identical with near end signal source device
s2, and then determine the actual samples frequency f of signal
s2, described n
s2and f
s2meet f
s2=n
s2f
signal, wherein, f
signalfor required generation signal frequency;
Step 2, according to the f determined in step 1
s2determine the parameter of remote signaling source device counter pulse generator; Described parameter is high level time t
hwith low level time t
l, described t
hand t
lmeet T
s=t
h+ t
l=1/f
s2; Meanwhile, by counter pulse, the sampling number generated in timing function used is set to n
s2, what complete between near end signal source device with remote signaling source device is synchronous.
Testing source equipment room remote synchronization Apparatus and method for based on PXI/PCI bus provided by the invention, by means indirectly, the synchronization pulse of a road and the same frequency of local output signal or the low integral multiple of the more local output frequency of frequency is first exported near end signal source device, in the frequency relative device of this signal, the low several magnitude of the frequency of reference clock pulse, then sends to remote signaling source device by long distance synchronous signal transmssion line.The lock-out pulse sent into as control signal, is triggered counter signals in it according to exporting high-frequency clock sampling signal synchronizing cycle by remote signaling source device.Thought that what the method reflected realize and concrete ways well solve the remote synchronous problem based on PXI/PCI bus apparatus.
Accompanying drawing explanation
Fig. 1 is for realizing the overall overview of the testing source equipment room output signal synchronous method of PXI (PCI) bus;
Fig. 2 is for realizing the LabView program of local signal and synchronizing signal output near end signal source device with same analog output card (AO card) different AO passage;
Fig. 3 is for realizing the LabView program user interface of local signal and synchronizing signal output near end signal source device with same analog output card (AO card) different AO passage, can by arranging the value of " synchronizing signal and local signal frequency multiple difference (sync interval) " at interface, the synchronous signal frequency difference integral multiple that near-end is exported, 10 have been set in figure, namely represent a local signal outputting ten signal period, export a lock-out pulse.Near end signal source device local signal is that 1000Hz is sinusoidal wave, and lock-out pulse is 100Hz positive pulse;
Fig. 4 is the another kind of method producing synchronizing signal, near end signal source device, namely produce the LabView program of 100Hz lock-out pulse output near end signal source device with the a-road-through counter " ctr0 " on analog output card (AO card);
The program of LabView shown in Fig. 5 achieves the synchronizing signal imported into by synchronizing cable in the far-end driving source equipment outer triggering signal as universal counter, under the control of outer synchronous signal, produces the sampling pulse signal of required frequency;
The sampling pulse signal that Fig. 6 utilizes Fig. 5 program to produce, the signal required for the analog output card (AO card) controlled on far-end driving source equipment exports.If analog output card does not have universal counter, then need to adopt aerial lug using the sampling pulse signal of other counter card output pulse signals as analog output card;
Fig. 7 is the two-way far-end output signal that sampling pulse D/A that remote signaling source analog output card utilizes universal counter to generate is converted to.
Embodiment
Below embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
Present embodiments provide a kind of testing source equipment room remote synchronization equipment based on PXI/PCI bus, comprise for synchronous near end signal source device and remote signaling source device, connected by signal between described near end signal source device and remote signaling source device; Near end signal source device and remote signaling source device are the virtual instrument equipment adopting standard P XI/PCI bus interface form; Near end signal source device and remote signaling source device are equipped with the standard P XI or pci bus interface analog output card that export for local signal; The analog output card of remote signaling source device be provided with for generation of high-frequency sampling pulse counter module or be configured with universal counter card.
In the present embodiment, counter module is the counter card that modulating output clamp carries universal counter or configuration separately; Counter adopts remote signaling source device plate to carry clock signal as rolling counters forward clock signal; PXI/PCI highway width is 32, operating voltage is 3.3V/5.5V, and frequency is 33MHz/66MHz, and the communication between analog output card and main control computer cpu bus is realized by PCI bridge road, described modulating output is arranged with plate and carries FIFO buffer, and supports DMA transmission mode; Analog output card supporting signal sample frequency is greater than 200KHz, and sampling precision is not less than 12bit, and output voltage range is-10V ~+10V.
Two need synchronous signal source spacing to be less than 50 meters when using ribbon feeder, 100 meters are less than during twisted pair transmission line, coaxial shielding line is less than 150 meters, two-conductor line is adopted to carry out the transmission [5] of synchronization pulse, on wire, distributed capacitance is less than 0.001 microfarad, and conductor resistance is less than 5 ohm.
Embodiment 2
The synchronous method that the present embodiment is the testing source equipment room remote synchronization equipment based on PXI/PCI bus that utilizes embodiment 1 to provide, comprises the following steps:
The first step, selects suitable synchronous transmission of signal line type according to the Distance geometry synchronous transmission line periphery electromagnetic environment between near end signal source device and remote signaling source device;
Second step, the modulating output card driver that near end signal source device calls PXI/PCI interface by programming controls its output near end signal source desired signal, exports the low frequency synchronisation pulse signal of a road and near-end output signal frequency phase-difference integral multiple simultaneously;
3rd step, the synchronizing signal of remote signaling source device with Long line transmission, for external trigger source is by the counter on analog output card or the independent counter card configured, configures counter works in pulse generate pattern by analog output card or counter card driver; Generate the local high-frequency sampling pulse signal needed for analog output card;
4th step, the pulse that synchronizing signal each cycle that near end signal source device is sent into triggers start-stop counter module exports, thus ensure within the signal period, far-end and near-end once synchronously, the signal frequency exported after both sides D/A is changed is consistent, constant phase difference, realizes the remote synchronization of testing source equipment room.
In the first step, the selection principle of synchronous transmission of signal line type is: the distance being less than 50 meters selects ribbon feeder or twisted-pair feeder; The distance being less than 100 meters selects twisted pair transmission line or coaxial shielding line; Be greater than 100 meters and the distance being less than 200 meters uses coaxial shielding line; Described transmission line type is determined by the distortion factor after transmission line with test pulse signal.
Carry out near end signal source device programming procedure in second step to comprise the steps:
Step 1, according to the maximum sample rate index of analog output card and the upper limit of required generation signal highest frequency determination near end signal source device sampling number, the maximum number of the data point that calculating simulation output card produces, that is:
Wherein, described S
maxfor the maximum sample rate that analog output card has, f
maxfor the highest frequency of required generation signal;
Step 2, according to the maximum number of step 1 established data point, calculates the sampled point data amount check that actual D/A changes, that is:
n
s≤X n
max；
Wherein, described X is sampling number;
Step 3, the sampled point data amount check determined according to step 2 and required generation signal frequency, the sample frequency during work of calculating simulation output card, that is:
f
s＝n
sf
signal；
Wherein, f
signalfor required generation signal frequency;
Step 4, generates signal frequency f according to step 3 is required
signal, determine the frequency of synchronizing signal, make the frequency of synchronizing signal be required generation signal frequency f
signal1/n.
In above-mentioned steps 2, sampling number is 70% ~ 80% of the maximum number of data point; Preferably, sampling number is 75% of the maximum number of data point.
In above-mentioned steps 4, n is for dividing exactly f
signalinteger, and to be determined by actual test according to the distance between synchronizer.
Carry out near end signal source device programming procedure in 3rd step to comprise the steps:
Step 1, adopts the sampling number n of the method determination remote signaling source device local signal identical with near end signal source device
s2, and then determine the actual samples frequency f of signal
s2, described n
s2and f
s2meet f
s2=n
s2f
signal, wherein, f
signalfor required generation signal frequency;
Step 2, according to the f determined in step 1
s2determine the parameter of remote signaling source device counter pulse generator; Described parameter is high level time t
hwith low level time t
l, described t
hand t
lmeet T
s=t
h+ t
l=1/f
s2; Meanwhile, by counter pulse, the sampling number generated in timing function used is set to n
s2, what complete between near end signal source device with remote signaling source device is synchronous.
Above-described embodiment 1 and embodiment 2 are specially:
Hardware device needed for embodiment 1 and software as follows:
Each equipment and software are correctly installed according to its operation instruction, configuration, analog output card self-inspection completes.
In embodiment 2, when carrying out " near end signal source device " programming, can determine configuration parameter required in program in the steps below, process is as follows:
According to the maximum sample rate index of analog output card and the upper limit of required generation signal highest frequency determination near end signal source device sampling number, maximum data point calculating method is as follows:
S in above formula
maxfor the maximum sample rate that analog output card has, f
maxfor the highest frequency of required generation signal, n
maxfor the maximum number of the data point that analog output card can produce.
According to the maximum sampled point amount that upper step is determined, consider desired signal precision, maximum data generally can be selected to count 70% ~ 80%, as the sampling number of local signal, is taken as 75% herein.Namely
n
s≤75％n
max
According to data volume and the required generation signal frequency of the sampled point determined, determine sample frequency when analog output card works.Computational methods are as follows:
f
s＝n
sf
signal
F in above formula
sfor sample frequency when analog output card works, n
sfor the sampled point data amount check that actual D/A changes, f
signalfor required generation signal frequency.
The frequency f of the output signal generated needed for two equipment
signal, determine the frequency of synchronizing signal, make the frequency of synchronizing signal be the frequency f outputed signal
signal1/n, n is for dividing exactly f
signalinteger, n should be determined by actual test according to the distance between synchronizer, in the impregnable situation of guarantee output signal, gets the minimum value that it meets the demands as far as possible.In this example when generating the original sample point that analog output card uses, outputing signal in the array of corresponding sampled point and containing 10 periodic output signal, therefore the actual signal generated is f
signal10 times.And the frequency of synchronization pulse is f
signal.
For the generation of near end signal source device signal and synchronizing signal, have multiple implementation method, this realizes routine synchronizing signal and equipment local output signal is all realized by the different analog output channels of same analog output card NI-PXI-6733 analog output card.The program that realizes concrete LabView refers to accompanying drawing 2.In addition, synchronizing signal also can adopt the universal counter on NI-PXI-6733 analog output card to realize, and it realizes program and refers to accompanying drawing 4.And if near end signal source device signal and synchronizing signal generate employing two pieces of different analog output cards, its implementation is similar to accompanying drawing 4 to accompanying drawing 2, only to need by the RTSI bus of PXI case back plate by the clock signal route of one of them plate on another plate, as the clock signal of another plate.
The software of remote signaling source device needs parameter determination process as follows:
First the sampling number n of the method determination remote signaling source device local signal identical with near end signal source device is adopted
s2, and then determine the actual samples frequency f of signal
s2, this sampling number is identical with the parameter that sample frequency can adopt with near end signal source device, also can be different.But the sampling number n selected must be ensured
s2, sample frequency f
s2meet f
s2=n
s2f
signal.
According to the sample frequency f determined
s2determine the parameter of remote signaling source device universal counter pulse generate program: mainly high level time t
hwith low level time t
l, both sums must ensure the cycle of sampled signal needed for modulating output, i.e. T
s=t
h+ t
l=1/f
s2.The sampling number generated by counter pulse in timing function used is n simultaneously
s2.Specific implementation program refers to shown in accompanying drawing 5.Selected n in figure
s2be 2500, sample frequency is f
s2for 250KHz.High level time t
hwith low level time t
lbe 4 microseconds.
Generating routine its implementation for far-end local signal is similar to shown in Fig. 2, when arranging timing function, needs selection reference source to be the pulse output signals of universal counter.Be 250K in this example, concrete methods of realizing refers to shown in accompanying drawing 6.
By above step, what just can complete between near end signal source device with remote signaling source device is synchronous.
Synchronous method shown in embodiment 2 only need at the signal of two equipment room Long line transmission 100Hz, just can reach the same result that conventional synchronization methods needs the time-base signal transmitting 100KHz to reach, and the method applied in the present invention can make sampled point number and sampling pulse signal frequency (data updating rate) difference of the analog output card of near end signal source device and remote signaling source device, and traditional synchronous method, this point cannot realize.Therefore the method for the invention can adapt to the different hardware condition of terminal device, and flexibility greatly strengthens.The reduction of frequency transmission signal in synchronous transmission line, minimizing to the technical requirement of transmission line cable own, more complicated electromagnetic environment can be adapted to, enhance the antijamming capability of whole system entirety, substantially increase synchronization dependability.
First above-described embodiment selects suitable synchronous transmission of signal line type according to the Distance geometry synchronous transmission line periphery electromagnetic environment between near end signal source device and remote signaling source device, can select with reference to following principle: comparatively short distance (being less than 50 meters) can select ribbon feeder or twisted-pair feeder, moderate distance (being less than 100 meters) selects twisted pair transmission line or coaxial shielding line, and longer distance (be greater than 100 meters and be less than 200 meters) needs to use coaxial shielding line.In concrete engineering, should carry out field test experiment, test pulse signal, by the distortion factor after transmission line, determines transmission line type.Ensure that pulse synchronous signal is after transmission, triggers along not being affected, do not occur multiple-pulse or the higher spike of amplitude.Subsequently, control it at analog output card (AO card) driver calling PXI (PCI) interface proximally by programming and export near end signal source desired signal, export a road synchronization pulse simultaneously, if when local signal frequency is higher, the sampled point of the signal in multiple cycle then can be comprised in the sample source data array of local signal, and for the original sampling data array of synchronizing signal, then only comprise the sampled point of one-period, local signal frequency can be made after process like this to be the integral multiple of the frequency of synchronizing signal, on the basis ensureing local signal frequency, reduce the frequency of synchronizing signal.Concrete multiple is determined by test method, but multiple difference is less, and after synchronous, between signal, phase error is less.Therefore, when meeting long range propagation requirement, make synchronization pulse frequency identical with local output signal frequency as far as possible.Accompanying drawing 2 is that a concrete LabView realizes program, and this program, while exporting required local 1KHz sine wave signal for near-end, outputs the synchronizing signal of low 10 times of a frequency ratio local signal.Fig. 3 is output signal and the synchronization waveform figure of this program.If near end signal source device for generation of the analog output card of synchronizing signal be the analog output card being different from generation local signal, the RTSI synchronous bus that theres is provided in PXI (PCI) bus apparatus or PFI output must be provided and the plate of the analog output card for generation of local signal be carried clock signal route to the capture card being used for synchronizing signal and producing, this clock signal be produced the clock source of capture card as synchronizing signal.If synchronizing signal is realized by the universal counter near end signal source device, the clock reference signal also needing guarantee universal counter used and analog output card clock reference signal used are same signal.
For remote signaling source device, need to use the universal counter on analog output card or configure separately counter card to generate local high-frequency sampling pulse signal, and work in pulse generate pattern by analog output card driver deployment universal counter, triggering mode is external trigger, and trigger source is the synchronization pulse of Long line transmission.Coincidence counter is for generation of the impulse sampling pulse signal exported needed for local signal, and its frequency exporting pulse needs the frequency of sampling number and the remote signaling source output signal changed according to remote signaling source device D/A to determine.The pulse that synchronizing signal each cycle that proximally signal source equipment is sent into triggers start-stop counter exports, thus ensures within the signal period, and once, the signal frequency exported after both sides D/A is changed is consistent, constant phase difference synchronously for far-end and near-end.
The testing source equipment room remote synchronization Apparatus and method for based on PXI/PCI bus that above-described embodiment provides, after two device synchronization, with signal in ground for benchmark carries out scanning radiometer analog imaging, become simulation cloud atlas each bar scan line original position close alignment.Equipment is through Acceptance Test and expert's Acceptance Review, and drop into real satellite test more than a year, applicable cases is good, meets completely in the test of Fengyun-II satellite analog imaging requirement synchronous between remote equipment.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (9)
1., based on a synchronous method for the testing source equipment room remote synchronization equipment of PXI/PCI bus, comprise the following steps:
The first step, selects suitable synchronous transmission of signal line type according to the Distance geometry synchronous transmission line periphery electromagnetic environment between near end signal source device and remote signaling source device;
Second step, the modulating output card driver that near end signal source device calls PXI/PCI interface by programming controls its output near end signal source desired signal, exports the low frequency synchronisation pulse signal of a road and near-end output signal frequency phase-difference integral multiple simultaneously;
3rd step, the synchronizing signal of remote signaling source device with Long line transmission, for external trigger source is by the counter on analog output card or the independent counter card configured, configures counter works in pulse generate pattern by analog output card or counter card driver; Generate the local high-frequency sampling pulse signal needed for analog output card;
4th step, the pulse that synchronizing signal each cycle that near end signal source device is sent into triggers start-stop counter module exports, thus ensure within the signal period, far-end and near-end once synchronously, the signal frequency exported after both sides D/A is changed is consistent, constant phase difference, realizes the remote synchronization of testing source equipment room.
2. the synchronous method of the testing source equipment room remote synchronization equipment based on PXI/PCI bus according to claim 1, it is characterized in that, in the described first step, the selection principle of synchronous transmission of signal line type is: the distance being less than 50 meters selects ribbon feeder or twisted-pair feeder; The distance being less than 100 meters selects twisted pair transmission line or coaxial shielding line; Be greater than 100 meters and the distance being less than 200 meters uses coaxial shielding line;
Described transmission line type is determined by the distortion factor after transmission line with test pulse signal;
In described 3rd step, triggering mode is external trigger, and trigger source is the synchronization pulse of Long line transmission.
3. the synchronous method of the testing source equipment room remote synchronization equipment based on PXI/PCI bus according to claim 1, is characterized in that, carry out near end signal source device programming procedure and comprise the steps: in described second step
Step 1, according to the maximum sample rate index of analog output card and the upper limit of required generation signal highest frequency determination near end signal source device sampling number, the maximum number of the data point that calculating simulation output card produces, that is:
Wherein, described S
maxfor the maximum sample rate that analog output card has, f
maxfor the highest frequency of required generation signal;
Step 2, according to the maximum number of step 1 established data point, calculates the sampled point data amount check that actual D/A changes, that is:
Wherein, described X is sampling number;
Step 3, the sampled point data amount check determined according to step 2 and required generation signal frequency, the sample frequency during work of calculating simulation output card, that is:
f
s＝n
sf
signal；
Wherein, f
signalfor required generation signal frequency;
Step 4, generates signal frequency f according to step 3 is required
signal, determine the frequency of synchronizing signal, make the frequency of synchronizing signal be required generation signal frequency f
signal1/n, wherein n is for dividing exactly f
signalinteger, and to be determined by actual test according to the distance between synchronizer.
4. the synchronous method of the testing source equipment room remote synchronization equipment based on PXI/PCI bus according to claim 3, it is characterized in that, in described step 2, sampling number is 70% ~ 80% of the maximum number of data point;
In described step 4, n is for dividing exactly f
signalinteger, and to be determined by actual test according to the distance between synchronizer.
5. the synchronous method of the testing source equipment room remote synchronization equipment based on PXI/PCI bus according to claim 1, is characterized in that, carry out remote signaling source device programming procedure and comprise the steps: in described 3rd step
Step 1, adopts the sampling number n of the method determination remote signaling source device local signal identical with near end signal source device
s2, and then determine the actual samples frequency f of signal
s2, described n
s2and f
s2meet f
s2=n
s2f
signal, wherein, f
signalfor required generation signal frequency;
Step 2, according to the f determined in step 1
s2determine the parameter of remote signaling source device counter pulse generator; Described parameter is high level time t
hwith low level time t
l, described t
hand t
lmeet T
s=t
h+ t
l=1/f
s2, wherein, T
sthe cycle of sampled signal needed for modulating output; Meanwhile, by counter pulse, the sampling number generated in timing function used is set to n
s2, what complete between near end signal source device with remote signaling source device is synchronous.
6. the synchronous method of the testing source equipment room remote synchronization equipment based on PXI/PCI bus according to any one of claim 1 to 5, is characterized in that, by signal cable synchronized links between described near end signal source device and remote signaling source device:
Described near end signal source device and remote signaling source device are the virtual instrument equipment adopting standard P XI/PCI bus interface form;
Described near end signal source device and remote signaling source device are equipped with the standard P XI or pci bus interface analog output card that export for local signal;
The analog output card of described remote signaling source device is provided with counter module or is configured with universal counter card.
7. the synchronous method of the testing source equipment room remote synchronization equipment based on PXI/PCI bus according to claim 6, is characterized in that, described counter module is the counter card that modulating output clamp carries universal counter or configuration separately;
Described counter adopts remote signaling source device plate to carry clock signal as rolling counters forward clock signal.
8. the synchronous method of the testing source equipment room remote synchronization equipment based on PXI/PCI bus according to claim 6, it is characterized in that, described PXI/PCI highway width is 32, operating voltage is 3.3V/5.5V, frequency is 33MHz/66MHz, communication between analog output card and main control computer cpu bus is realized by PCI bridge road, and described modulating output is arranged with plate and carries FIFO buffer, and supports DMA transmission mode.
9. the synchronous method of the testing source equipment room remote synchronization equipment based on PXI/PCI bus according to claim 6, it is characterized in that, described analog output card supporting signal sample frequency is greater than 200KHz, and sampling precision is not less than 12bit, and output voltage range is-10V ~+10V.
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| CN201210285576.8A CN102882624B (en) | 2012-08-10 | 2012-08-10 | PXI/PCI bus-based remote synchronization device of test signal source devices and method thereof |
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| CN108243126B (en) * | 2016-12-26 | 2020-10-09 | 航天信息股份有限公司 | Method and device for determining beat fault site |
| CN110632568B (en) * | 2019-11-05 | 2021-11-16 | 中国科学院电子学研究所 | Test signal source of real-time imaging processor of synthetic aperture radar |
| CN112379396B (en) * | 2020-06-11 | 2021-10-26 | 襄阳达安汽车检测中心有限公司 | System and method for calibrating time and distance parameters of automobile satellite navigation tester |
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