CN110824897A

CN110824897A - Synchronous time service system among various collectors

Info

Publication number: CN110824897A
Application number: CN201911155728.0A
Authority: CN
Inventors: 汲云涛; 郭彦双; 刘力强
Original assignee: INSTITUTE OF GEOLOGY CHINA EARTHQUAKE ADMINISTRATION
Current assignee: INSTITUTE OF GEOLOGY CHINA EARTHQUAKE ADMINISTRATION
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-02-21
Anticipated expiration: 2039-11-22
Also published as: CN110824897B

Abstract

The invention discloses a synchronous time service system among a plurality of collectors, which comprises: the system comprises a first receiver, a repeater, a plurality of second receivers and a plurality of collectors; the first receiver is connected with the repeater, the repeater is respectively connected with the second receivers, the number of the second receivers is the same as that of the collectors, and the second receivers are connected with the collectors; the first receiver is used for receiving outdoor GPS signals; the repeater is used for forwarding and broadcasting the GPS signal indoors; and each second receiver is used for sending the received broadcasted GPS signal to the collector corresponding to the second receiver for time service and time calibration. The invention not only can realize convenient synchronous recording of time calibration signals, but also can regularly modify the system time of each collector, and the process is fully automatic, does not need human intervention and is very convenient.

Description

Synchronous time service system among various collectors

Technical Field

The invention relates to the technical field of synchronous time service, in particular to a synchronous time service system among various collectors.

Background

With the progress of computer technology and data acquisition technology and the reduction of the cost of data storage media, a single collector has been unable to meet the requirements of scientific research and technical observation. The development of scientific research also requires more comprehensive observation and description of certain experimental phenomena, which means that the following functions need to be realized: 1) more data collectors and data recording channels are required to record different spatial positions of an experimental sample or an observation target under the condition of high spatial resolution; 2) different physical sensors are adopted to observe various physical properties and parameters of an experimental sample or an observation target, such as temperature, pressure, speed, strain, acoustic emission and the like; 3) higher sampling frequencies were used to obtain a more comprehensive time response of the experimental samples. However, the problem with this is also apparent, as is the problem of time synchronization of the different collectors. The different collectors record the time for the data using their respective clocks. Firstly, the clock precision and the initial value of different collectors are different; secondly, for different physical sensors, the impedance characteristics are often very different, collectors with different performances must be adopted, and the observation frequencies of different physical quantities are different, for example, acoustic emission often requires MHz sampling, and pressure generally uses dozens of Hz; third, if the experiment time is long, the respective temperature drifts of the clocks are different. This all makes time synchronization between multiple collectors more difficult.

The traditional laboratory time proofreading technology mainly has two types:

as the name implies, the switch pair is made artificially by using a physical switch to make and break so as to cause a rising edge and a falling edge in a voltage signal. Through the on-off switch for multiple times, the rising edges and the falling edges of multiple groups of voltages are synchronously manufactured in the data signals of multiple channels and multiple collectors, and therefore in the post-processing process, the rising edges and the falling edges are used as synchronous signals to carry out time calibration on the multiple channels and the multiple collectors. The disadvantages of this method are: 1) the precision is not enough and is unstable, the precision depends on the speed of switching on and off the switch each time, the rising edge and the falling edge of the voltage are steeper the switching is faster, however, the switching speed depends on the manual speed of an operator, and the switching is very unstable; 2) manual operation is needed, and the effect has a plurality of unstable factors; 3) the artificially manufactured voltage rise and fall can cause interference on signals, so that the on-off of the switch can be operated only twice, namely, the experiment is started, and the experiment is close to the end, because no obvious experiment signal exists at the moment. 4) The post-processing workload is large, the time of the rising edge and the falling edge of the artificially manufactured voltage is not fixed, experimenters are required to artificially search the rising edge and the falling edge in each recording channel in the data processing stage after the experiment, and the workload is very large.

Another conventional method is to allow all the collectors to simultaneously collect signals of the same sensor, so that in the data post-processing stage, the signals of the channel are used to perform time calibration on each collector. The method has the disadvantages that 1) one path of signal needs to be divided into multiple paths, so that synchronous acquisition of multiple collectors is realized, but one path of signal is divided into multiple paths, so that a large amount of noise can be introduced, and later-stage matching and time calibration are not facilitated; 2) this approach is not necessarily feasible because the individual sensors and the acquired impedance are not necessarily matched; 3) the signal originating from the sensor is not necessarily suitable for time matching, since the signal from the sensor is the true signal of the experiment, which does not necessarily have steep voltage rising and falling edges. For example, if the sensors are flat signals or relatively random signals, even if all sensors record the same path of sensor, effective and highly accurate time calibration cannot be performed.

Disclosure of Invention

Based on this, the invention aims to provide a synchronous time service system among a plurality of collectors so as to realize synchronous time service among the plurality of collectors.

In order to achieve the above object, the present invention provides a synchronous time service system among a plurality of collectors, the synchronous time service system comprising:

the system comprises a first receiver, a repeater, a plurality of second receivers and a plurality of collectors;

the first receiver is connected with the repeater, the repeater is respectively connected with the second receivers, the number of the second receivers is the same as that of the collectors, and the second receivers are connected with the collectors;

the first receiver is used for receiving outdoor GPS signals; the repeater is used for forwarding and broadcasting the GPS signal indoors; and each second receiver is used for sending the received broadcasted GPS signal to the collector corresponding to the second receiver for time service and time calibration.

Optionally, the GPS signal includes time information and a pulse per second signal.

Optionally, the second receiver is connected to the collectors through digital signal data lines, and is configured to transmit received digital time signals to the collectors through the digital signal data lines, where the digital time signals are used to modify system time of each of the collectors at regular time;

the second receiver is connected with the collectors through analog signal data lines and used for transmitting received analog pulse-per-second signals to the collectors through the analog signal data lines, and the analog pulse-per-second signals serve as synchronous signals and are used for time calibration of the collectors.

Optionally, the first receiver is connected to the repeater through a signal line.

Optionally, the repeaters are respectively connected to the second receivers wirelessly.

Optionally, the first receiver and the second receiver are both GPS receivers, and the repeater is a GPS repeater.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects:

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a diagram illustrating an overall structure of a synchronous time service system according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a connection between a second receiver and a collector according to an embodiment of the present invention;

1. a first receiver, 2, a repeater, 3, a second receiver, 4 and a collector.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Fig. 1 is an overall structure diagram of a synchronous time service system according to an embodiment of the present invention, and as shown in fig. 1, the present invention discloses a synchronous time service system among a plurality of collectors 4, where the synchronous time service system includes: a first receiver 1, a transponder 2, a plurality of second receivers 3 and a plurality of collectors 4.

The first receiver 1 is connected with the repeater 2, the repeater 2 is respectively connected with the second receivers 3, the number of the second receivers 3 is the same as that of the collectors 4, and the second receivers 3 are connected with the collectors 4;

the first receiver 1 is used for receiving outdoor GPS signals; the transponder 2 is used for forwarding and broadcasting the GPS signal indoors; each second receiver 3 is configured to send the received broadcast GPS signal to the collector 4 corresponding to the second receiver 3 for time service and time calibration.

In one embodiment, the GPS signal of the present invention includes time information and a pulse per second signal.

As an implementation manner, the second receiver 3 and the collectors 4 are connected by a digital signal data line, and configured to transmit a received digital time signal to the collectors 4 through the digital signal data line, where the digital time signal is used to modify the system time of each collector 4 at regular time; the second receiver 3 is connected to the collector 4 through an analog signal data line, and is configured to transmit a received analog pulse-per-second signal to the collector 4 through the analog signal data line, where the analog pulse-per-second signal is used as a synchronization signal for time calibration of each collector 4, as shown in fig. 2 in detail.

In one embodiment, the first receiver 1 is connected to the repeater 2 through a signal line, and the repeater 2 is connected to the second receiver 3 through a wireless connection.

In one embodiment, the first receiver 1 and the second receiver 3 are both GPS receivers, and the repeater 2 is a GPS repeater 2.

The invention utilizes GPS signals to synchronously time various and multiple collectors 4 in a laboratory, and has the following specific advantages:

firstly, the invention makes full use of GPS signals, and has high time service precision and resolution. Because the analog pulse per second signal of the GPS is broadcasted in a laboratory through the GPS transponder 2, the noise caused by the division of the signal into multiple paths does not exist, and the rising edge and the falling edge of the pulse per second signal are steep, thereby being beneficial to high-precision time synchronization.

1) The time service precision and the resolution are high; the GPS geostationary satellite transmits 1 sync signal per second to the earth, and the GPS receiver can provide a pulse signal 1PPS at intervals of 1s with an accuracy of not less than 1 μ s. Therefore, the first receiver 1 is arranged for receiving the GPS signals, and because the indoor environment is not favorable for receiving stable GPS signals, the GPS signal is broadcasted in a laboratory by adding the GPS transponder 2, so that synchronous time service among the plurality of collectors 4 is realized; in conclusion, the invention realizes synchronous pollination among a plurality of collectors 4 by using GPS signals, thereby improving the time service precision and the resolution ratio.

2) The two-stage time service is convenient to use and convenient to automate; the two-stage time service method adopted by the invention also fully utilizes the time signals of the GPS, namely the digital time signals and the analog pulse per second signals of the GPS signals, wherein the digital time signals are used for regularly modifying the system time of each collector 4. The analog pulse-per-second signal is recorded as a synchronization signal by each collector 4 for high-precision time calibration in the post-processing phase.

3) The number of the collectors 4 for synchronous time service is not limited; because the indoor is not beneficial to receiving GPS signals, the analog pulse-per-second signals of the GPS are broadcasted again in a laboratory through the transponder 2, as long as the indoor second receiver 3 is installed, the system can be used for synchronously recording time calibration signals, the expansion is easy, and the number of the collectors 4 participating in synchronous time service is not limited.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. The synchronous time service system among the various collectors is characterized by comprising:

2. The system of claim 1, wherein the GPS signals include time information and pulse-per-second signals.

3. The system for synchronous time service among a plurality of collectors according to claim 2, wherein the second receiver is connected with the collectors through digital signal data lines, and is configured to transmit received digital time signals to the collectors through the digital signal data lines, and the digital time signals are configured to modify the system time of each collector at regular time;

4. The system of claim 1, wherein the first receiver is connected to the repeater via a signal line.

5. The system of claim 1, wherein the repeaters are wirelessly connected to the second receiver.

6. The system of claim 1, wherein the first receiver and the second receiver are both GPS receivers and the repeater is a GPS repeater.