KR20130001860A - Network time protocol server using standard frequency signal and global positioning system signal and methdo for providing network time of the same - Google Patents

Network time protocol server using standard frequency signal and global positioning system signal and methdo for providing network time of the same Download PDF

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Publication number
KR20130001860A
KR20130001860A KR1020110062760A KR20110062760A KR20130001860A KR 20130001860 A KR20130001860 A KR 20130001860A KR 1020110062760 A KR1020110062760 A KR 1020110062760A KR 20110062760 A KR20110062760 A KR 20110062760A KR 20130001860 A KR20130001860 A KR 20130001860A
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South Korea
Prior art keywords
power supply
signal
standard
frequency signal
gps
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KR1020110062760A
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Korean (ko)
Inventor
나상철
이택수
임명혁
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(주)에버트랜드
이택수
나상철
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Priority to KR1020110062760A priority Critical patent/KR20130001860A/en
Publication of KR20130001860A publication Critical patent/KR20130001860A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
    • G01S19/05—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing aiding data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/06—Speed or phase control by synchronisation signals the synchronisation signals differing from the information signals in amplitude, polarity or frequency or length

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

A GPS signal receiving module for receiving a GPS signal including GPS time information, a standard signal receiving module for receiving a standard frequency signal including standard time information, and a GPS time information included in the received GPS signal in a receiving rate mode; Among the standard time information included in the received standard frequency signal, time information included in a signal having a high reception rate is selected and provided as network time, and in average mode, the average time information of the GPS time information and standard time information is used as network time. Configure the control module to calculate and provide. According to the NTP server and the network time providing method using the standard frequency signal and the GPS signal as described above, by using not only the GPS time information but also the signal having a high reception rate among the standard time information included in the standard frequency signal or the average thereof as the network time. This guarantees the accuracy of network time and reduces the error rate. In addition, there is an effect that can be prepared for the interruption of the regular power supply by providing a separate charging power. In each detailed circuit of the power supply module, a power supply terminal and a ground are separately provided to effect noise interference between the detailed circuits.

Description

Entity server using standard frequency signal and GPS signal and its network time providing method

The present invention relates to an NTP server and a method for providing network time using the same, and more particularly, to an NTP server and a method for providing network time using a standard frequency signal and a GPS signal.

NTP server (network time protocol server) is a configuration for providing accurate time to the client and support synchronization. NTP servers provide their own time information only for synchronization, but in order to provide more accurate time information, the NTP server may provide the time information by embedding an atomic clock or use GPS time information.

It is very important for NTP server to provide accurate time information at all times. However, the method of embedding atomic clock has a disadvantage that the unit price is too expensive, and when receiving and providing external time information, radio reception rate is not completely guaranteed. have.

On the other hand, the conventional NTP server does not have any countermeasures against an operation interruption or an error due to the interruption of the power supply at all times. Due to the operational nature of the server, poor time provision can have fatal consequences, leading to operational failure of the entire system.

An object of the present invention is to provide an NTP server using a standard frequency signal and a GPS signal.

Another object of the present invention is to provide a network time providing method of an NTP server using a standard frequency signal and a GPS signal.

NTP server using a standard frequency signal and a GPS signal according to the object of the present invention described above, GPS signal receiving module for receiving a GPS signal including GPS time information, and a standard frequency signal containing standard time information In the signal receiving module and the reception rate mode, time information included in a signal having a high reception rate among the GPS time information included in the received GPS signal or the standard time information included in the received standard frequency signal is selected and provided as network time. The average mode may include a control module that calculates and provides average time information of the GPS time information and standard time information as network time. The control module may be configured to operate in one of the reception rate mode and the average mode according to a user's selection, or the reception rate of any one of the GPS signal and the standard frequency signal may not reach a predetermined reference value. In this case, the reception rate mode may be set, and the reception rate of the GPS signal and the standard frequency signal may be set to the average mode when both of the reception rates are greater than or equal to the predetermined reference value. Here, it is preferable that the control module selects and operates any one of the reception rate mode and the average mode every predetermined time. And in order to increase the reception rate of the standard frequency signal, it may be configured to further include an external standard signal receiving module spaced apart further including an additional external antenna. The control module may be configured to receive a standard frequency signal through the standard signal receiving module in an internal mode and to receive a standard frequency signal through the external standard signal receiving module in an external mode according to a user's selection. In the mode, when the reception ratio of the standard frequency signal does not reach a predetermined reference value, the control unit may be configured to change to the external mode to receive a standard frequency signal through the external standard signal reception module. And an EL module configured as a backlight unit. The power supply module may further include a power supply module supplying a power supply voltage through an external power supply and precharging and supplying a power supply voltage for use in case of power failure. The power supply module may include an input power supply circuit receiving a power supply voltage from the external power supply, a control module power supply circuit converting the power supply voltage supplied from the power supply input circuit to the control module, and the power supply input. An RF module power circuit for converting the power supply voltage supplied from the circuit to the standard signal receiving module and the GPS signal receiving module, and an EL module for converting the power supply voltage supplied from the power supply input circuit to the EL module. And a power supply circuit for charging the power supply voltage supplied from the power supply input circuit and supplying the power supply voltage charged to the control module power supply circuit, the RF module power supply circuit, and the EL module power supply circuit during power failure. It may be configured to include. At this time, the control module power supply circuit, the RF module power supply circuit, and the EL module power supply circuit are preferably configured to have independent power supply voltage terminals and grounds to prevent noise interference between each other. Do.

According to another aspect of the present invention, there is provided a method for providing a network time of an NTP server using a standard frequency signal and a GPS signal, the method comprising: receiving a GPS signal including GPS time information and a standard frequency signal including standard time information, respectively; Calculating a reception ratio of the received GPS signal and a standard frequency signal, determining whether the calculated reception ratio is less than a predetermined reference value, and, as a result of the determination, any one of the calculated reception ratios is predetermined. If the reference value is not met, time information included in a signal having a higher reception rate is selected and provided as network time. If all of the calculated reception rates are higher than or equal to a predetermined reference value, average time information of the GPS time information and standard time information is provided. And calculating and providing network time. . At this time, in the step of determining whether each of the calculated reception ratio is less than a predetermined reference value, when the reception ratio of the calculated standard frequency signal is less than a predetermined reference value, by using an external standard signal receiving module to re-receive the standard frequency signal To calculate the reception rate, and determine whether the calculated reception rate is below a predetermined reference value.

According to the NTP server and the network time providing method using the standard frequency signal and the GPS signal as described above, by using not only the GPS time information but also the signal having a high reception rate among the standard time information included in the standard frequency signal or the average thereof as the network time. This guarantees the accuracy of network time and reduces the error rate. In addition, there is an effect that can be prepared for the interruption of the regular power supply by providing a separate charging power. In each detailed circuit of the power supply module, a power supply terminal and a ground are separately provided to effect noise interference between the detailed circuits.

1 is a block diagram of an NTP server using a standard frequency signal and a GPS signal according to an embodiment of the present invention.
2 is a block diagram of a power module of an NTP server using a standard frequency signal and a GPS signal according to an embodiment of the present invention.
3A is a circuit diagram of an input power circuit of an NTP server using a standard frequency signal and a GPS signal according to an embodiment of the present invention.
3B is a circuit diagram of a power supply circuit for a control module of an NTP server using a standard frequency signal and a GPS signal according to an embodiment of the present invention.
3C is a circuit diagram of a power supply circuit for an RF module of an NTP server using a standard frequency signal and a GPS signal according to an embodiment of the present invention.
3D is a circuit diagram of a power supply circuit for an EL module of an NTP server using a standard frequency signal and a GPS signal according to an embodiment of the present invention.
3E is a circuit diagram of a charging power circuit of an NTP server using a standard frequency signal and a GPS signal according to an embodiment of the present invention.
4 is a flowchart of an NTP server and a network time providing method using a standard frequency signal and a GPS signal according to another embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an NTP server using a standard frequency signal and a GPS signal according to an embodiment of the present invention.

Referring to FIG. 1, an NTP server 100 (hereinafter, referred to as an NTP server) using a standard frequency signal and a GPS signal according to an embodiment of the present invention may include a GPS signal receiving module 110, It may be configured to include a standard signal receiving module 120, a control module 130, an external standard signal receiving module 140, an EP module 150, and a power module 160.

NTP server 100 is characterized by improving the accuracy and reliability of the network time by using any one of the time information with a high reception rate or the average time information of the GPS time information and the standard time information included in the standard frequency signal. In addition, it is possible to prevent the operation interruption even when the supply of the continuous power is stopped by charging the power at all times in advance. Hereinafter, the detailed configuration will be described.

The GPS signal receiving module 110 is configured to receive a GPS signal including GPS time information. GPS signals contain accurate GPS time information from atomic clocks built into GPS satellites. Of course, the NTP server 100 provides network time by compensating for errors due to GPS signal receiving distance or distance to the client.

The standard signal receiving module 120 is configured to receive a standard frequency signal including standard time information. Here, the standard frequency signal (standard frequency signal) is a signal that is radiated in time by the standard maintenance agency of each country. In the United States, the National Institute of Standards / Technology (NIST) emits, and in Japan, the Japanese call sign JJY is emitted at a frequency of 40 kHz / 60 kHz. The standard signal module 120 may be configured to receive standard frequency signals of any kind and use them at network time.

The control module 130 selects and provides the time information included in the signal having the high reception rate among the GPS time information included in the GPS signal or the standard time information included in the standard frequency signal as the network time in the reception rate mode, and the GPS in the average mode. It may be configured to calculate and provide average time information of the time information and standard time information as network time. As such, the control module 130 may be operated in one of a reception rate mode and an average mode. The control module 130 may be operated to operate in any one mode according to a user's selection, or may be operated to operate while changing a mode according to a predetermined criterion.

More specifically, the control module 130 may be configured to operate by setting to one of the reception rate mode or the average mode according to the user's selection. If the reception rate of any one of the GPS signal and the standard frequency signal does not meet the predetermined reference value, the reception rate mode is set. If the reception rate of the GPS signal and the standard frequency signal is higher than the predetermined reference value, the operation is set to the average mode. Can be. That is, if a signal has a bad reception rate, only one signal having a high reception rate may be used for network time. If both signals have a good reception rate, the average time of two signals may be used as network time.

Herein, the control module 130 may receive a signal at least 10 times and determine a reception rate to operate in a reception rate mode or an average mode. In addition, the control module 130 may obtain and synchronize an average using, for example, a signal received at least 10 times.

In addition, the control module 130 periodically checks the reception rate of both signals, and selects and operates one of the reception rate mode and the average mode every predetermined time. This is because it is necessary to provide a more accurate time in a radio wave environment that is constantly changing.

The external standard signal receiving module 140 may further include an additional external antenna to increase the reception rate of the standard frequency signal, and may be configured to be spaced apart from the outdoor. Especially for standard frequency signals, the JJY call sign uses low frequencies of 40 kHz and 60 kHz, which is weak against ambient interference. Since the level of the received signal is usually only a few microvolts, it is preferable to further include a separate external standard signal receiving module 140 equipped with an external antenna in order to increase the reception rate. In this case, only one of the external standard signal receiving module 140 and the standard signal receiving module 120 should be operated. Therefore, either the internal mode or the external mode is operated. Such a mode change may also be configured to change according to a user's selection or automatically change according to a predetermined criterion.

More specifically, the control module 130 controls to receive the standard frequency signal through the standard signal receiving module in the internal mode and the external standard signal receiving module in the external mode according to the user's selection or When the reception rate of the standard frequency signal in the internal mode does not reach a predetermined reference value, the control unit may be configured to change to the external mode to receive the standard frequency signal through the external standard signal reception module.

The EL module 150 may be configured as a backlight unit, and information, such as a current mode or a reception rate network time, may be displayed on an LCD (liquid crystal display) through the EL module 150.

The power supply module 160 may be configured to supply a power supply voltage through an external constant power supply and to charge and supply a power supply voltage for use in case of power failure. That is, it can be configured to maintain network time without interruption even in the event of power failure. 2 to 3E, the power supply module 160 will be described in more detail.

2 is a block diagram of a power module of an NTP server using a standard frequency signal and a GPS signal according to an embodiment of the present invention. 3A is an input power supply circuit, FIG. 3B is a control module power supply circuit, FIG. 3C is an RF module power supply circuit, FIG. 3D is an EL module power supply circuit, and FIG. 3E is a circuit diagram of a charging power supply circuit.

First, referring to FIG. 2, the power supply module 160 includes an input power supply circuit 161, a control module power supply circuit 162, an RF module power supply circuit 163, an EL module power supply circuit 164, and a charging power supply circuit. 165 may be configured to include. As described above, the power supply module 160 includes a power supply circuit that receives a power supply voltage from a constant power supply voltage, a power supply circuit for charging, and a power supply circuit for driving each module. It has a feature to reduce noise. Hereinafter, the detailed structure is further demonstrated.

Here, the input power supply circuit 161 is configured to receive a power supply voltage from an external power supply. Referring to FIG. 3A, the input power supply circuit 161 may be configured to receive a DC voltage of 5V by converting a constant power supply voltage or to receive a power supply voltage through a USB. Here, diodes D2 and D3 prevent the reverse voltage between such a 5 V power supply voltage of the VCC5 terminal and the USB power supply voltage of the VCC5_USB terminal. The diode D7 prevents reverse voltage with the charging power supply circuit 165.

The power supply circuit 162 for the control module is configured to convert the power supply voltage supplied from the power input circuit 161 to supply the control module 130. 3B, the power supply circuit 162 for the control module is particularly noisy in the Ethernet chipset. In particular, it is excessively generated during clock generation for high speed communication.

The power supply circuit 163 for the RF module of FIG. 3C is configured to convert a power supply voltage supplied from the power input circuit 161 to supply the standard signal receiving module 120 and the GPS signal receiving module 110.

The EL module power supply circuit 164 of FIG. 3D is configured to convert the power supply voltage supplied from the power supply input circuit 161 and to supply it to the EL module 150. At this time, the EL module power supply circuit 164 also generates excessive noise in the process of generating the frequencies of 190 V and 205 Hz in the process of driving the backlight unit.

Here, the aforementioned power supply circuit 162 for the control module, the power supply circuit 163 for the RF module, and the power supply circuit 164 for the EL module are independent of each other in order to prevent noise interference from each other. And is configured to have a ground. In particular, certain noise can cause a lot of constant current consumption, which can result in unstable voltage supply. To prevent this, use the XC6225 to set a limit of 100 mA current limit and cut off the supply of excessive current in a certain part. Maintain stable voltage supply.

The charging power supply circuit 165 charges the power supply voltage supplied from the power supply input circuit 161 to the control module power supply circuit 162, the RF module power supply circuit 163, and the EL module power supply circuit 164 in case of power failure. And to supply a charged power supply voltage. Here, the capacitor C43 attenuates the overall noise of the power supply voltage coming from the input power supply circuit 161. Capacitor C101 attenuates the noise in the supply branch. On the other hand, diode D4 serves to prevent the reverse voltage of the battery.

4 is a flowchart of an NTP server and a network time providing method using a standard frequency signal and a GPS signal according to another embodiment of the present invention.

Referring to FIG. 4, the GPS signal receiving module 110 receives a GPS signal including GPS time information, and the standard signal receiving module 120 receives a standard frequency signal including standard time information, respectively (S110). .

Next, the control module 130 calculates the reception rates of the previously received GPS signal and the standard frequency signal, respectively (S120). For example, the reception ratio may be calculated based on the number of signal reception times of about 10 times.

In addition, the control module 130 determines whether each of the calculated reception rates falls below a predetermined reference value (S130). More specifically:

The control module 130 determines each reception rate of the GPS signal and the standard frequency signal (S131). In this case, the control module 130 may be particularly configured to determine whether the reception rate of the standard frequency signal is less than the predetermined reference value (S132). This is because the standard signal receiving module 120 can be set to receive again through the external standard signal receiving module 140 when the reception rate is less than. Accordingly, when the reception ratio of the standard frequency signal is less than that, the standard frequency signal is re-received using the external standard signal reception module 9140 (S133). In addition, the reception rates of the GPS signal and the standard frequency signal may be calculated again (S120).

As a result of the determination of step S130, the control module 130 selects and provides time information included in a signal having a higher reception rate as a network time when any one of the reception rates does not reach a predetermined reference value (S140). If all of the reception rates are above a predetermined reference value, average time information of GPS time information and standard time information is calculated and provided as network time (S141).

Here, the reception rate is determined periodically based on a predetermined time, and it is preferable to change the mode periodically.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

110: GPS signal receiving module
120: standard signal receiving module
130: control module
140: external standard signal receiving module
150: EL module
160: power supply module
161: input power circuit
162: power supply circuit for the control module
163: power supply circuit for the RF module
164: power supply circuit for EL module
165: charging power circuit

Claims (11)

A GPS signal receiving module for receiving a GPS signal including GPS time information;
A standard signal receiving module for receiving a standard frequency signal including standard time information;
In the reception rate mode, the GPS time information included in the received GPS signal or the standard time information included in the received standard frequency signal is selected and provided as network time, and in the average mode, the time information included in the received signal is provided. An NTP server using a standard frequency signal and a GPS signal, including a control module that calculates and provides GPS time information and average time information of standard time information as network time. The method of claim 1, wherein the control module,
According to a user's selection, the receiver is set to one of the reception rate mode and the average mode, or is set to the reception rate mode when the reception rate of any one of the GPS signal and the standard frequency signal does not reach a predetermined reference value. And when both the reception ratios of the GPS signal and the standard frequency signal are greater than or equal to the predetermined reference value, the NTP server using the standard frequency signal and the GPS signal. The method of claim 2, wherein the control module,
NTP server using a standard frequency signal and a GPS signal, characterized in that for setting a predetermined mode of any one of the reception rate mode or the average mode for operation. The method of claim 1,
In order to increase the reception rate of the standard frequency signal, NTP server using a standard frequency signal and a GPS signal further comprising an external standard signal receiving module that is further spaced apart including an additional external antenna. The method of claim 1, wherein the control module,
According to the user's selection, the control unit is configured to receive the standard frequency signal through the standard signal receiving module in the built-in mode and the standard frequency signal through the external standard signal receiving module in the external mode, or to control the standard frequency signal in the built-in mode. If the reception rate is less than a predetermined reference value NTP server using a standard frequency signal and a GPS signal to change to the external mode to control to receive a standard frequency signal through the external standard signal receiving module. The method of claim 1,
NTP server using a GPS signal and a standard frequency signal further comprising an EL module consisting of a backlight unit. The method according to claim 6,
An NTP server using a standard frequency signal and a GPS signal further comprising a power supply module supplying a supply voltage through an external power supply and pre-charging the supply voltage for use in case of a power failure. The method of claim 7, wherein the power module,
An input power supply circuit receiving a power supply voltage from the external power supply;
A control module power supply circuit for converting a power supply voltage supplied from the power supply input circuit and supplying the converted power supply to the control module;
A power supply circuit for an RF module that converts a power supply voltage supplied from the power input circuit and supplies the converted power to the standard signal receiving module and the GPS signal receiving module;
EL module power supply circuit for converting the power supply voltage supplied from the power input circuit to supply to the EL module
And a charging power supply circuit configured to charge the power supply voltage supplied from the power supply input circuit and supply the power supply voltage charged to the control module power supply circuit, the RF module power supply circuit, and the EL module power supply circuit during power failure. NTP server using standard frequency signals and GPS signals. The power supply circuit for the control module, the power supply circuit for the RF module, and the power supply circuit for the EL module according to claim 8,
An NTP server using a standard frequency signal and a GPS signal, each configured to have independent power supply voltage terminals and grounds to prevent noise interference between each other. Receiving a GPS signal including GPS time information and a standard frequency signal including standard time information, respectively;
Calculating reception rates of the received GPS signal and standard frequency signal, respectively;
Determining whether each of the calculated reception rates falls below a predetermined reference value; and
As a result of the determination, when any one of the calculated reception rates does not reach a predetermined reference value, time information included in a signal having a higher reception rate is selected and provided as network time, and the calculated reception rates are all equal to or greater than a predetermined reference value. The network time providing method of an NTP server using a standard frequency signal and a GPS signal, comprising calculating and providing average time information of the GPS time information and standard time information as network time. 11. The method of claim 10, wherein in the step of determining whether each of the calculated reception ratio is less than a predetermined reference value,
If the calculated reception rate of the standard frequency signal is less than the predetermined reference value, the external standard signal receiving module is used to re-receive the standard frequency signal to calculate the reception rate, and determining whether the calculated reception rate is less than the predetermined reference value. Method of providing network time of NTP server using standard frequency signal and GPS signal.
KR1020110062760A 2011-06-28 2011-06-28 Network time protocol server using standard frequency signal and global positioning system signal and methdo for providing network time of the same KR20130001860A (en)

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KR1020110062760A KR20130001860A (en) 2011-06-28 2011-06-28 Network time protocol server using standard frequency signal and global positioning system signal and methdo for providing network time of the same

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