KR20010019094A - Apparatus and method for generating data using satellites in time and frequency transmission system - Google Patents

Abstract

PURPOSE: The apparatus and method for generating data in a time and frequency transmission system using a satellite is provided to collect and convert satellite orbital data, satellite location compensation data and time data and to transmit them to a base band in a transmitting station. CONSTITUTION: A data generator(210) is comprised of a compensation data receiving part(211), a compensation data conversion and generation part(212), a satellite orbital data receiving part(213), a satellite orbital data conversion and generation part(214), a compensation data and satellite orbital data integrating/transmitting part(215) and a user interface processing part(216). The compensation data receiving part(211) receives a compensation value for the orbit of a satellite from a compensation station(220). The compensation data conversion and generation part(212) generates an integral compensation value from the received compensation data according to a reference value previously set in each field. The satellite orbital data receiving part(213) receives satellite orbital data from a satellite control center(230). The satellite orbital data conversion and generation part(214) generates an integral satellite orbital value from the received satellite data, based on the preset reference value of each field. The compensation data and satellite orbital data integrating/transmitting part(215) integrates compensation data and satellite data in a data structure and transmits them according to the request of a base band(240). The user interface processing part(216) dynamically displays the transmission status of compensation data satellite data to a user.

Description

Apparatus and method for generating data in time and frequency transmission system using satellites {APPARATUS AND METHOD FOR GENERATING DATA USING SATELLITES IN TIME AND FREQUENCY TRANSMISSION SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a data generating apparatus and a method for generating a data using a satellite, and a computer readable recording medium recording a program for realizing the same, and in particular, satellite orbit data, satellite position correction data and visual data. The present invention relates to a data generating apparatus and method for collecting, converting, and transmitting the data to a baseband of a transmitting station, and a computer-readable recording medium having recorded thereon a program for realizing the same.

In general, a time and frequency transmission system is a system for distributing time and frequency necessary for synchronization of wired and wireless communication networks to each level of the communication network, which is composed of a transmitting station, a satellite, a receiver, and a compensating station. It transmits orbital data, satellite position correction data and visual data to satellite. Therefore, a data generator that collects, converts, and transmits the data to the baseband in this transmitting station is essential.

Such a data generator receives and processes satellite position trajectory data, correction data, and visual data from several satellite control stations. At this time, data should be continuously transmitted. In this case, since the satellite control station and the transmitting station are separated from each other, a technology that needs to be transmitted on-line through a network is required to transmit data. In addition, there is a need for a technique for converting the transmitted data into a predetermined format, converting the transmitted data to the baseband.

In addition, the data generated by the data generator is transmitted to the baseband, which transmits the data to the satellite via the antenna. At this time, the baseband determines the accuracy of the received data and should request retransmission to the data generator when an error occurs. Therefore, a technology for smooth and stable data transmission and reception between the data generator and the bass band is required.

The present invention, which is designed to meet the above requirements, collects and converts satellite orbit data, satellite position correction data, and time data in a time and frequency transmission system using satellites and sends them to the baseband of the transmitting station. It is an object of the present invention to provide a computer-readable recording medium that records a generating device, a method thereof, and a program for realizing the same.

1 is an exemplary configuration diagram of a time and frequency transmission system using a satellite to which the present invention is applied.

2 is a block diagram of an embodiment of a data generator in a time and frequency transmission system using a satellite according to the present invention;

3 is a flow chart of an embodiment of a data generation method in a time and frequency transmission system using a satellite according to the present invention;

4 is a flowchart illustrating an embodiment of an on-line processing process of data transmitted from a satellite control station and a correction station in a data generation method according to the present invention.

5 is a flowchart illustrating a data transmission process between a data generator and a baseband in the data generation method according to the present invention.

6 is an explanatory diagram of a data structure sent from the data generator to the baseband in the data generation method according to the present invention;

* Explanation of symbols for the main parts of the drawings

210: data generator 220: correction station

230: satellite control station 240: baseband

In order to achieve the above object, the present invention provides a data generating apparatus in a time and frequency transmission system using a satellite, wherein the correction data for a satellite orbit is received from an external correction station and received at a first predetermined reference value set in each field. Correction data generating means for generating a correction value accordingly; Satellite data generating means for receiving satellite orbit data from an external satellite control station and generating satellite orbit values according to a second predetermined reference value set in each field; Data integrating and transmitting means for integrating correction and satellite data for transmission upon request of the baseband; And user interfacing means for displaying the correction and transmission status of the satellite data to the user.

In addition, the present invention provides a data generating method in a data generating apparatus of a time and frequency transmission system using a satellite, wherein the satellite orbit data and correction data received from a satellite control station and a correction station are processed in real time by the data generating apparatus. A first step of making; And a second step of transmitting satellite orbit data, satellite position correction data, and visual data generated by the data generator according to a request of the baseband.

In addition, the present invention provides a time and frequency transmission system having a processor, comprising: a function of processing satellite orbit data and correction data received from a satellite control station and a correction station in real time by the data generator; And a computer-readable recording medium having recorded thereon a program for realizing a function of transmitting satellite orbit data, satellite position correction data and visual data generated by the data generator in response to a request of a baseband.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a time and frequency transmission system using a satellite to which the present invention is applied, and includes a satellite 110, a receiving station 120, a transmitting station 130, a correction and integrity monitoring station 140, and a satellite control station ( 150).

Here, the transmitting station 130 is composed of a baseband 131, a data generator 132.

First, the data generator 132 of the transmitting station 110 on-line the satellite orbit data sent from the satellite control station 150 and the correction signal and integrity monitoring data sent from the calibration and integrity monitoring station 140. -line), and then processed into a format required by the system and transmitted to the baseband 131 by RS-232C. The baseband 131 performs channel encoding and time encoding on satellite orbit data (position, velocity, acceleration vector) for each x, y, and z coordinates, visual data, and satellite orbit correction data received from the data generator 132. time encoding) and transmits to the satellite 110 over a wireless section through an antenna.

Here, the satellite 110 receives a signal transmitted from the transmitting station 130 as a simple repeater and broadcasts it to the ground.

Meanwhile, the terrestrial receiving station 120 receives data from the satellite 110 and utilizes it as data for synchronizing the communication network, and the calibration and integrity monitoring station 140 compares the satellite orbit data and the correction data with the actual satellite data. To generate the correction data of the satellite position and send it to the data generator 132 of the transmitting station 130.

2 is a configuration diagram of an apparatus for generating data in a time and frequency transmission system using a satellite according to the present invention.

The data generator 210 includes a correction data receiver 211, a correction data converter and generator 212, a satellite orbit data receiver 213, a satellite orbit data converter and generator 214, and correction data and The satellite orbit data integration / transmitter 215 and the user interface processor 216 are provided.

The function of the data generating device of the present invention as described above will be described in detail as follows.

First, the correction data receiver 211 receives a correction value for the satellite orbit from the correction station 220, and the correction data conversion and generation unit 212 corrects the correction value as an integer according to the reference value set in each field in the received correction data. Create

Meanwhile, the satellite orbit data receiving unit 213 receives satellite orbit data from the satellite control station 230, and the satellite orbit data converting and generating unit 214 refers to a predetermined reference value set in each field in the received satellite data to be an integer. Generate satellite orbit values.

Finally, the correction data and the satellite orbit data integration / transmission unit 215 integrates the correction and satellite data in one data structure and serves to transmit at the request of the baseband 240. The user interface processing unit 216 functions to dynamically display the state of correction and transmission of satellite data to the user.

3 is a flowchart illustrating a data generation method in a time and frequency transmission system using a satellite according to the present invention.

As shown in FIG. 3, the data coming from the satellite control station 230 and the correction station 220 is processed in real time by the data generator 210 (301), and the satellite orbit data generated by the data generator 210, satellites. The position correction data and the time data are smoothly transmitted to the baseband 240 (302).

4 is a flowchart illustrating an embodiment of an on-line processing process of data transmitted from a satellite control station and a correction station in a data generation method according to the present invention.

In the present invention, since data is periodically transmitted from the satellite control station 230 and the correction station 220, it is essential to process on-line.

As shown in FIG. 4, if the data generator 210 is started during system initialization, port 1 of the computer assigned to the satellite control station 230 and the port of the computer assigned to the correction station 220. Open Port 2 (401). The initial state of the ports 1 and 2 is sleep, and does not operate until data enters the port from the outside (402, 407).

It is checked whether data has arrived from the satellite control station 230 at port 1 (403).

As a result of the check, if the data does not arrive, port 1 goes to the sleep state 402 which is the initial state, and if the data arrives, the suitability of the satellite data format is verified (404).

As a result of the verification, if the satellite data format is not appropriate, port 1 goes to sleep 402 which is the initial state, and if the format of the satellite data is appropriate, the integer value of the field is extracted according to the reference value set in each field of the satellite orbit data. The data is stored in a file according to the data structure for transmission to the baseband 240 (406).

It is checked whether data has arrived from the correction station 220 at the port 2 (408).

As a result of the check, if no data arrives, port 2 goes to sleep 407 in an initial state, and if data arrives, the suitability of the correction data format is verified (409).

As a result of the verification, if the satellite data format is not appropriate, port 2 goes to the initial sleep 407. If the format of the correction data is appropriate, the integer value of the field is extracted according to the reference value set in each field of the calibration trajectory data. The data is stored in a file according to the data structure for transmission to the baseband 240 (406).

5 is a flowchart illustrating a data transmission process between a data generator and a baseband in the data generation method according to the present invention.

As shown in FIG. 5, the data generator 210 once enters a standby mode (501).

Next, it is checked whether an inquiry character (ENQ) signal requesting data transmission is received from the baseband 240 (502).

As a result of the check, if the inquiry character (ENQ) signal is not received, the process goes to the process of entering the standby mode (501). When the inquiry character (ENQ) signal is received, the operation (SUBF_FLAG) is checked to see if there is any data that can be sent. Check whether it is on (503).

As a result of the check, if the state of checking whether there is data (SUBF_FLAG) is not on, a subframe is generated (504) and the process proceeds to step 503 of checking whether there is data again.

If the status of the operation to check whether there is data (SUBF_FLAG) is on, the value of the variable (Bytecount) that counts the number of bytes sent when sending data and the number of errors (ERROR) that count the number of errors are 0. 505.

Subsequently, after transmitting one byte (506), it is checked whether the received signal from the baseband 240 is a positive signal (ACK) (507).

As a result of the check, if the received signal is the positive signal ACK, the byte count is increased by 1 (508), and then it is checked whether the byte count is 91 (509).

As a result of the check, if the byte count (Bytecount) is 91, the process returns to the standby mode 501 and waits for the baseband 240 signal.

If the byte count is not 91, the process proceeds to step 506 of transmitting 1 byte.

The reason for checking whether the byte count is 91 is that one subframe includes 91 bytes.

As a result of the test, if the received signal is not the positive signal ACK, it is checked whether the received signal is the negative signal NAK (510).

As a result of the check, if the received signal is a negative signal (NAK), the baseband 240 is a signal that the data is not properly received. Then, after retransmitting the previously transmitted byte (511), a process of checking whether the received signal is a positive signal (ACK) ( Go to 507).

As a result of the check, if the received signal is not the negative signal NAK, the controller waits for a predetermined time to increase the error variable value by 1 (512) and checks whether the error variable value is 3 (513).

As a result of the check, if the value of the ERROR variable is 3, it is determined that an abnormality has occurred in the data generator 210 or the baseband 240, and after the warning sound is generated (514), the process proceeds to the process (501) of entering the standby mode.

As a result of the check, if the error parameter value is not 3, the process proceeds to step 507, in which it is determined whether the received signal is the positive signal ACK.

6 is an explanatory diagram for a data structure sent from the data generator to the baseband in the data generation method according to the present invention.

As shown in FIG. 6A, the structure of a string is shown in the data structure sent from the data generator 210 to the baseband 240.

Here, if the transmission unit sent in 1 second is defined as a string, one string is composed of 72 bits, the first 8 bits are identifiers (IDs), and the remaining 64 bits are data.

One bit of preamble is an indication of the beginning of a string, subframe # (subframe number) 3 bits represents the number of subframes, and string number # (string number) 4 bits represents a string in one subframe. Indicates the order of

As shown in FIG. 6B, the content of information is shown in the subframe structure. The subframe is an actual transmission unit including track information, correction information, and the like, and ten strings are combined to form one subframe. The time information and the trajectory information are contained in the strings # 1, 2, and 3, and the correction information is contained in the strings # 4 to 7. In string # 9, Integrity is system integrity determination information, and SNR is data transmission environment determination information between a satellite and a transceiver station. String # 10 contains the transmitting station identifier (ID) and location information. The scattered blanks are empty for future data structures.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

As described above, the present invention can be used as a performance test tool for continuous systems by transmitting data on-line through a network between a satellite control station and a transmitting station and transmitting and receiving smooth and stable data between a data generator and a baseband. However, there is a visible effect of system performance on system demonstration.

In addition, it can be implemented as a core component system of the visual synchronization system, and there is an effect that can accumulate the underlying technology in the operation management system in the future.

Claims (9)

A data generating apparatus in a time and frequency transmission system using a satellite, Correction data generating means for receiving correction data on the satellite orbit from an external correction station and generating a correction value according to a first predetermined reference value set in each field; Satellite data generating means for receiving satellite orbit data from an external satellite control station and generating satellite orbit values according to a second predetermined reference value set in each field; Data integrating and transmitting means for integrating correction and satellite data for transmission upon request of the baseband; User interfacing means for showing the calibration and transmission of satellite data to the user Apparatus for generating data in a time and frequency transmission system using a satellite comprising a. The method of claim 1, The correction data generating means, A correction data receiver for receiving correction data on satellite orbits from the correction station; And Correction data conversion and generation unit for generating a correction value by converting into an integer according to the first predetermined reference value set in each field of the correction data received through the correction data receiving unit Apparatus for generating data in a time and frequency transmission system using a satellite comprising a. The method according to claim 1 or 2, The satellite data generating means, A satellite orbit data receiver for receiving satellite orbit data from the satellite control station; And Satellite orbit data conversion and generation unit for generating a satellite orbit value by converting the second predetermined reference value preset in each field of satellite data received from the satellite orbit data receiver to an integer Apparatus for generating data in a time and frequency transmission system using a satellite comprising a. A data generating method in a data generating apparatus of a time and frequency transmission system using a satellite, A first step of processing the satellite orbit data and correction data received from the satellite control station and the correction station in real time in the data generator; And A second step of transmitting satellite orbit data, satellite position correction data, and visual data generated by the data generator according to a request of the baseband; Data generation method in a data generator of a time and frequency transmission system using a satellite comprising a. The method of claim 4, wherein The first step is, A third step of opening each port assigned to the satellite control station and the correction station; A fourth step of confirming whether data has arrived from the satellite control station or the correction station; A fifth step of verifying suitability of the satellite data format when data arrives from the satellite control station, and verifying suitability of the correction data format when data arrives from the correction station; And A sixth step of extracting an integer value according to a predetermined reference value set in each field of the satellite orbit data and correction data and storing it in a file according to a predetermined format; Data generation method in a data generator of a time and frequency transmission system using a satellite comprising a. The method according to claim 4 or 5, The second step, A seventh step of checking whether there is data that can be sent when the data request signal is received from the baseband; An eighth step of generating a subframe if there is no result of the seventh step; And A ninth step of transmitting data to the baseband if the seventh step is confirmed Data generation method in a data generator of a time and frequency transmission system using a satellite comprising a. The method of claim 6, The seventh step, A tenth step in which the data generator enters a standby mode; An eleventh step of confirming whether an inquiry character (ENQ) signal is received from the baseband requesting transmission of data; A twelfth step of transitioning to a standby mode if an inquiry text signal is not received as a result of the eleventh step check; And As a result of the eleventh step check, a thirteenth step of checking whether a state (SUBF_FLAG) for checking whether there is data to be sent when an inquiry text signal is received is ON. Data generation method in a data generator of a time and frequency transmission system using a satellite comprising a. The method of claim 6, The ninth step, A tenth step of initializing a variable for counting the number of bytes and an error if the state of the job SUBF_FLAG is ON; An eleventh step of transmitting a predetermined byte after performing the tenth step; A twelfth step of checking whether the signal received from the baseband is an acknowledgment signal (ACK); A thirteenth step of checking whether the byte count has reached the first predetermined value after increasing the byte count when the positive signal is received as a result of the twelfth step; A fourteenth step of, if the byte count is the first predetermined value, goes to the seventh step; and if the count is not the first predetermined value, the fourteenth step; A fifteenth step of checking whether the received signal is a negative signal (NAK) when a positive signal is not received as a result of the twelfth step check; A sixteenth step of transiting to the twelfth step after retransmitting the predetermined byte when a negative signal is received as a result of the fifteenth step; As a result of the checking of the fifteenth step, if no negative signal is received, waiting for a predetermined time to increase the error variable value and then checking whether the error variable value reaches the second predetermined value; And As a result of the checking of the seventeenth step, if the error variable value does not reach the second predetermined value, the process proceeds to the twelfth step. If the error variable value reaches the second predetermined value, an alarm sounds and then the procedure goes to the seventh step. The 18th step Data generation method in a data generator of a time and frequency transmission system using a satellite comprising a. In a time and frequency transmission system with a processor, A function of processing satellite orbit data and correction data received from a satellite control station and a correction station in real time in the data generator; And A function of transmitting satellite orbit data, satellite position correction data and visual data generated by the data generator according to the request of the baseband. A computer-readable recording medium having recorded thereon a program for realizing this.