KR200233038Y1 - Accurate Clock Operated by the Signal from Global Positioning System - Google Patents

Abstract

The present invention receives the time information radiated from the GPS satellites of the Global Positioning System (GPS) and compensates for the time delay that occurs during the transmission to accurately display the current time within one thousandth of a second. The present invention relates to a precision watch using a GPS receiver, comprising: a GPS receiver configured to receive and output position and time information radiated from a GPS satellite 10 through an antenna 11 in a precision watch driven by using time information of a position measuring system ( 12); A microcontroller (13) connected to the output side of the GPS receiver (12) and outputting compensated time data by compensating for time delays occurring during extraction of time signals and receiving time information among the received data; An output port 14 for transmitting the output signal of the microcontroller 13 to the time display 15; And a visual indicator 15 for displaying a precise time based on the compensated visual data output from the microcontroller 13.

Therefore, the present invention does not require any additional time adjustment, and always provides accurate time within one thousandth of a second, and can be used without special management by being installed in railway history, government offices, churches, etc. It is.

Description

Accurate Clock Operated by the Signal from Global Positioning System

The present invention relates to a precision clock using a global positioning system (GPS), and more particularly, to compensate for the time delay generated during reception by receiving visual information radiated from a GPS satellite of the positioning system. The present invention relates to a precision clock using a position measuring system that can display high-precision time to users through a precision watch installed in a public place or a specific place by displaying time data with a time indicator.

The Global Positioning System (GPS) is able to locate anywhere in the world with 24 GPS satellites orbiting three (3 reserves) at altitudes of 20,200 km. On the ground, the control station control center collects and synchronizes GPS satellite information, and the user knows the current position through a separate GPS receiver.

The GPS receiver calculates an accurate position, a moving speed, and a time of the GPS receiver based on a signal received from a GPS satellite, and uses a triangulation method to determine the position of the GPS system. Three satellites are required for triangulation, and a global positioning system as a positioning system using satellites covering a total of four GPS satellites including all observation satellites for visual error. It is also called a global positioning system.

On the other hand, since the time signal can be accurately synchronized using the time signal emitted through the GPS satellites, it is widely used in a wide range of fields where synchronization is essential, for example, it is used as a network synchronization means in the base station of the mobile phone.

However, the clock displayed for the public in public and specific places does not need to be as precise as the network synchronization means used in the base station of the mobile phone, and it is required to display the correct time within, for example, one hundredth of a second.

The present invention was conceived in consideration of the above situation, and receives the time information radiated from the GPS satellites of the GPS system, compensates for the time delay generated at the time of receiving the current time of 1000 seconds The purpose of the present invention is to provide a precision clock using a position measuring system that can accurately display the time within a thousandth of a second to the general public using a public place or a specific place.

1 is a block diagram schematically showing the internal configuration of a precision watch using a position measuring system according to the present invention,

2 is a flowchart of a firmware program of the microcontroller according to the present invention;

3 is a main circuit diagram of a precision watch according to the present invention,

4 is a circuit diagram for driving a six-digit seven-segment visual indicator according to the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

10: GPS satellite 11: antenna

12: GPS receiver 13: microcontroller

14: output port 15: time indicator

In order to achieve the above object, the present invention provides a precision clock driven by using the time information of the positioning system, GPS receiver for receiving and outputting the position and time information radiated from the GPS satellite through the antenna; A microcontroller connected to an output side of the GPS receiver and outputting compensated time data by compensating for time delays occurring during extraction of time signals and receiving time information among the received data; An output port for transmitting the output signal of the microcontroller to a visual indicator; And a visual indicator configured to display the precise time based on the compensated visual data output from the microcontroller.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention in more detail as follows.

1 is a block diagram schematically showing the internal configuration of a precision watch using a position measuring system according to the present invention, Figure 2 is a firmware program flow chart of the microcontroller according to the present invention, Figure 3 is the present invention 4 is a circuit diagram for driving a six-digit 7-segment time indicator according to the present invention.

Referring to this, as shown in FIG. 1, the precision watch using the positioning system according to the present invention has a GPS receiver 12 that receives and outputs position and time information radiated from the GPS satellite 10 through the antenna 10. And a microcontroller 13 connected to an output side of the GPS receiver 12 and outputting compensated visual data by extracting and compensating a visual signal among the received data, and outputting the output signal of the microcontroller 13 to a visual indicator. An output port 14 for transmitting to (15) and a time indicator 15 for displaying a high precision time in 7-segment based on the compensated time data output from the microcontroller 13.

The GPS receiver 12 receives position and time information radiated from the GPS satellite 10 every second and outputs it to other equipment through a communication port, and a signal is provided to notify the start of time every second. For example, in case of using Navicom's GP1200, which is currently commercially available in Korea, the time is transmitted in sequence of hours, minutes, and seconds in binary form after the letter 'H5'.The 7-segment time indicator receives this data. (15) and the microcontroller 13 is required to display the time on the analog type clock, and simply use PB-2S or PB-2H from Compiler, and PIC16F877 from Microchip to reduce the unit cost. do. The start of data reception uses the signal coming out of the GPS receiver 12 every second as an interrupt.

Since it is difficult to drive the visual indicator 5 while receiving the visual data, the visual data is output to the output pin of the microcontroller 13, and automatically displayed sequentially by 4 bits. For example, in case of using PICBASIC, Binary Coded (BCD) command is used to represent binary data of position and visual information emitted from GPS satellite 10 by BCD code, and the ten digits are in the upper nibble and the jobs are lower. Stored in nibble.

The output visual data may be transmitted to the visual indicator 15 by another electronic circuit, for example by a multiplexer circuit with another microcontroller or oscillator.

2 is a flowchart of a firmware program of the microcontroller according to the present invention, when the operator who manages and maintains a precision watch installed in a public place or a specific place operates a power switch (not shown) to drive the micro watch ( 13) is initialized (S11).

When the interruption is generated from the GPS receiver 12 in the standby state (S12), the firmware program increases the number of seconds by 1 unconditionally, and when the value reaches 60, it becomes 0, and then outputs an output pin indicating the value of seconds. Through the time display 15 is output to the time display 15 connected to the output port 14 through the (S13). This is for minimizing the reception time delay by displaying the expected time on the time indicator 15 before the time information is received.

When using the GPS receiver 12, for example, the GPCORE 1200, the microcontroller 13 receives the time information of the character 'H5', and then receives 3 bytes in sequence and stores them in the memory (S14). The received data represents each hour / minute / second, which is converted into a binary code (BCD) and output from the output pin of the microcontroller 13 and applied to the visual indicator 15 through the output port 14. . As a result, the time in seconds is displayed on the time display 15 immediately after the interrupt is generated, and the hour / minute data is received from the GPS satellites 10 and displayed.

In addition, the firmware program of the microcontroller 13 checks the error of the received time information (S15), if an error occurs, performs the step of detecting the interrupt again (S12), and if the error does not occur, The time data is output and displayed through the time indicator 15 connected to the output port 14 (S16).

3 is a main circuit diagram of a precision watch according to the present invention, wherein the microcontroller 13 receives time data from the GPS receiver 12 and uses three ports to display six digits of hours / minutes / seconds. The 4-bit data representing each digit is multiplexed onto the data bus using, for example, 74244. The multiplexing control signal is generated by another microcontroller, not shown, and a signal for determining whether to display 4-bit data on a predetermined 7-segment time indicator 15 is also generated at the same time.

4 is a circuit diagram for driving a six-digit 7-segment visual indicator according to the present invention. Such a precision clock is implemented to accurately display within one thousandth of a second, considering the error of the GPS receiver 12 used and considering the time taken to display visual data.

Therefore, as described above, the present invention receives time information radiated from a GPS satellite of a positioning system (GPS), compensates for the time delay generated during reception, and accurately displays the current time within one thousandth of a second. In other words, it is possible to provide the public with accurate time within a thousandth of a second to the public in public or specific places.

In addition, the precision watch using the position measuring system according to the present invention is not limited to the above-described embodiment, and various modifications and changes can be made without departing from the technical gist of the invention.

As described above, according to the present invention, a time signal is extracted by receiving the position and time information radiated from the GPS satellite of the positioning system, and the time is corrected by minimizing the time delay caused by the time information transmission. By displaying, no additional time adjustment is required, and it provides accurate time at all times within one thousandth of a second, and can be used without special management by being installed in railway history, government offices, churches, etc. It works.

Claims (1)

In the precision clock driven by using the time information of the positioning system, A GPS receiver 12 for receiving and outputting position and time information radiated from the GPS satellites 10 through the antenna 11; A microcontroller (13) connected to the output side of the GPS receiver (12) and outputting compensated time data by compensating for time delays occurring during extraction of time signals and receiving time information among the received data; An output port 14 for transmitting the output signal of the microcontroller 13 to the time display 15; And And a visual indicator (15) for displaying a precise time based on the compensated visual data output from the microcontroller (13).