CN109917637A - A kind of data collecting card high precision time service method - Google Patents
A kind of data collecting card high precision time service method Download PDFInfo
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- CN109917637A CN109917637A CN201910188504.3A CN201910188504A CN109917637A CN 109917637 A CN109917637 A CN 109917637A CN 201910188504 A CN201910188504 A CN 201910188504A CN 109917637 A CN109917637 A CN 109917637A
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Abstract
The invention discloses a kind of data collecting card high precision time service methods, and GPS time service module carries out signal connection, transmission absolute time to host computer by serial ports and host computer first, and sends second pulse signal to data collecting card.Then data collecting card carries out signal connection by PCIe bus and host computer, and continuously uploads data to host computer according to the N number of sampled point of every bag data.Host computer calculates the hits between two pulse per second (PPS)s according to the data that data collecting card uploads, deviation caused by eliminating because of Crystal Oscillator Errors, then multiple averaging is carried out, eliminate error caused by being shaken by pulse per second (PPS), accurate sample rate is acquired, the precision time service of every bag data sampled point can be completed.Data collecting card high precision time service method proposed by the present invention provides High Precision Time Stamps especially in high-speed sampling for the collected data waveform of data collecting card, and provides high-precision time dimension information.
Description
Technical field
The invention belongs to digital processing field more particularly to a kind of data collecting card high precision time service methods.
Background technique
Data collecting card is widely used in all types of industries scene at present, simulates sum number from sensor or other Devices to test etc.
Automatic collection non electrical quantity or electric quantity signal in word unit under test are sent to host computer and are analyzed, handled.Data collection system is
In conjunction with realizing flexible, the customized survey of user based on the measurement software and hardware product of computer or other dedicated testing platforms
Amount system.More and more application scenarios need data collecting card data acquisition at present, while providing high-precision for data
Timestamp, part data acquisition fixture having time stabs function, or selects dedicated time service module, and above two mode increases
Hardware cost is added.In addition, having its time precision of the capture card of timestamp function not high currently on the market, it is micro- to can only achieve 5
The precision of second.
Summary of the invention
To solve the above-mentioned problems, the present invention proposes a kind of data collecting card high precision time service method, comprising the following steps:
S1.GPS time service module carries out signal connection by serial ports and host computer, sends absolute time to host computer, concurrently
Send second pulse signal to data collecting card；
S2. data collecting card carries out signal connection by PCIe bus and host computer, and according to the N number of sampled point of every bag data
The continuous data that upload are to host computer；
S3. host computer judges whether the bag data includes pulse per second (PPS) rising edge by the data that data collecting card uploads, when
When the bag data includes pulse per second (PPS) rising edge, its position for being located at the bag data is recorded, is labeled as Pm, then proceed to monitor next
A pulse per second (PPS) rising edge, if not monitoring pulse per second (PPS) rising edge in m bag data, and monitors the second in m+1 bag data
Rising edge of a pulse then records its position for being located at the bag data, is labeled as Pn；
S4. the sampled point S between two pulse per second (PPS)s is calculated, deviation caused by the Crystal Oscillator Errors because of data collecting card is eliminated:
S=N-Pm+N×m+Pn(formula 1)；
S4. error caused by shaking for elimination because of pulse per second (PPS), is averaged multiple sampled point S, its average value can be obtained
Sm:
Sm=(S1+S2+ ... Sm)/m (formula 2)；
S5. the time interval Δ t between each sampled point is calculated:
Δ t=1/Sm(formula 3)；
S6. the nanosecond precise time T of b-th of sampled point in a bag data between two pulse per second (PPS)s is calculated:
T=(N-Pm+ (a-1) × N+b) × Δ t (formula 4)；
S7. second grade absolute time nanosecond precise time T sent with GPS time service module can be obtained with combining
Complete split-second precision realizes the high-precision time service of data collecting card data.
Further, GPS time service module sends the SDI0 interface of second pulse signal to capture card.
Further, judge the bag data whether include pulse per second (PPS) rising edge method are as follows: host computer judges that SDI0 is
No changed by 0 is 1, if variation, which includes pulse per second (PPS) rising edge.
The beneficial effects of the present invention are: for the collected data waveform of data collecting card, especially in high-speed sampling,
High Precision Time Stamps are provided, and provide high-precision time dimension information.The method proposed through the invention, can be obtained height
The nsec of precision, precision were 100 nanoseconds.
Detailed description of the invention
Fig. 1 is the principle of the present invention figure；
Fig. 2 is that the data of data collecting card upload schematic diagram.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, this hair of Detailed description of the invention is now compareed
Bright specific embodiment.
The present invention proposes a kind of data collecting card high precision time service method, as shown in Figure 1, GPS time service module passes through serial ports
Signal connection is carried out with host computer, sends absolute time to host computer, and sends second pulse signal and connects to data collecting card SDI0
Mouthful.Data collecting card carries out signal connection by PCIe bus and host computer, and continuously uploads according to the N number of sampled point of every bag data
Data are to host computer, as shown in Figure 2.Host computer is by judging whether data collecting card SDI0 from 0 becomes 1, to judge the packet number
According to whether including pulse per second (PPS) rising edge, when the bag data includes pulse per second (PPS) rising edge, its position for being located at the bag data is recorded,
Labeled as Pm, it then proceedes to monitor next pulse per second (PPS) rising edge, if not monitoring pulse per second (PPS) rising edge in m bag data,
And pulse per second (PPS) rising edge is monitored in m+1 bag data, then its position for being located at the bag data is recorded, P is labeled asn.First
The sampled point S between two pulse per second (PPS)s is calculated, deviation caused by the Crystal Oscillator Errors because of data collecting card: S=N-P is eliminatedm+N×m
+Pn.Error caused by eliminate because of pulse per second (PPS) shake, is averaged multiple sampled point S, its average value S can be obtainedm=(S1+
S2+…Sm)/m.Then the time interval Δ t=1/S between each sampled point is calculatedm.A between two pulse per second (PPS)s is calculated again
Nanosecond precise time T=(N-Pm+ (a-1) × N+b) × Δ t of b-th of sampled point in bag data.It is finally that nanosecond is accurate
Complete split-second precision, realization number can be obtained with combining in the second grade absolute time that time T is sent with GPS time service module
According to capture card data high-precision time service.
In a specific embodiment of the present invention, data collecting card resolution ratio is 12, occupies the high by 12 of 16 A/D data
Position, D2~D0 connection signal SDI2~SDI0, D3 are unused.Specifically, data collecting card selects Ling Hua PCIe-9814, data are adopted
The Crystal Oscillator Errors of truck are 20ppm, and sample rate 40MHz, every bag data is 1M sampled point, calculate adopting between two pulse per second (PPS)s
Sample number, deviation caused by eliminating because of Crystal Oscillator Errors carry out multiple averaging afterwards, eliminate error caused by being shaken by pulse per second (PPS), acquire
The precision time service of every bag data sampled point can be completed in accurate sample rate.
In a specific embodiment of the present invention, because error caused by the second pulse signal of GPS module is ± 50ns, pulse per second (PPS)
Signal errors is random error, Normal Distribution.Crystal Oscillator Errors are steady-state error, at any time, temperature it is slowly varying, in short-term surely
It is fixed.Assuming that there are error εs by GPS second pulse and UCT (Universal Time Coordinated), and ε obedience is just distributed very much, is taken
Sample number is N, then has:
ε~N (0, ζ2)
Assuming that the system output time is x, then UCT time are as follows:
yi=xi-εi
In formula, yiI-th of pulse per second (PPS) corresponding UCT, time error ε are exported for GPSi。
Time difference δ between two pulse per second (PPS)sTi=yi+1-yi, then it is spaced the time difference of multiple pulse per second (PPS) times are as follows:
δT1+δT2+…δTn=yi+1-yi-εi+1+ε1
Difference after multi collect between pulse per second (PPS) is mainly derived from second pulse signal shake, is excessively arranged standby while adopted
Collect same signal and carry out timestamp comparison, error is within 100ns.
The above is only a preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can be at this
In the text contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art institute into
Capable modifications and changes do not depart from the spirit and scope of the present invention, then all should be in the protection scope of appended claims of the present invention
It is interior.
Claims (3)
1. a kind of method when data collecting card high-precision time service, which comprises the following steps:
S1.GPS time service module carries out signal connection, transmission absolute time to host computer by serial ports and host computer, and sends the second
Pulse signal is to data collecting card；
S2. data collecting card carries out signal connection by PCIe bus and host computer, and continuous according to the N number of sampled point of every bag data
Data are uploaded to host computer；
S3. host computer judges whether the bag data includes pulse per second (PPS) rising edge by the data that data collecting card uploads, when the packet
When data include pulse per second (PPS) rising edge, its position for being located at the bag data is recorded, is labeled as Pm, then proceed to monitor next second
Rising edge of a pulse if not monitoring pulse per second (PPS) rising edge in m bag data, and monitors pulse per second (PPS) in m+1 bag data
Rising edge then records its position for being located at the bag data, is labeled as Pn；
S4. the sampled point S between two pulse per second (PPS)s is calculated, deviation caused by the Crystal Oscillator Errors because of data collecting card is eliminated:
S=N-Pm+N×m+Pn(formula 1)；
S4. error caused by shaking for elimination because of pulse per second (PPS), is averaged multiple sampled point S, its average value S can be obtainedm:
Sm=(S1+S2+ ... Sm)/m (formula 2)；
S5. the time interval Δ t between each sampled point is calculated:
Δ t=1/Sm(formula 3)；
S6. the nanosecond precise time T of b-th of sampled point in a bag data between two pulse per second (PPS)s is calculated:
T=(N-Pm+ (a-1) × N+b) × Δ t (formula 4)；
S7. second grade absolute time nanosecond precise time T sent with GPS time service module can be obtained completely with combining
Split-second precision, realize the high-precision time service of data collecting card data.
2. a kind of GPS timing method according to claim 1, which is characterized in that in the step S1, GPS time service module
Send the SDI0 interface of second pulse signal to capture card.
3. a kind of GPS timing method according to claim 2, which is characterized in that in the step S3, judge the bag data
Whether include pulse per second (PPS) rising edge method are as follows: host computer judge SDI0 whether by 0 variation for 1, if changing, the bag data packet
Rising edge containing pulse per second (PPS).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111336913A (en) * | 2020-03-19 | 2020-06-26 | 苏州华电电气股份有限公司 | Transformer winding deformation live monitoring device |
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