KR101394630B1 - Autonomous Command Execution System and Method according to Execution Time Order in Satellites - Google Patents

Abstract

The present invention relates to a system and method for automating the execution of satellite commands according to the execution time order, and more particularly, to a system and method for automating the execution of satellite commands, An execution time determiner for comparing the execution time of the storage command converted into the absolute time of the OBT format with the current OBT of the satellite to determine whether to execute the storage command, An instruction execution unit for executing a storage instruction judged to be performed by the execution time determination unit when the time and the current OBT of the satellite coincide with each other and the execution time of the storage instruction has not reached the current OBT of the satellite And a storage command scheduling unit for storing the storage command. According to the present invention, it is possible to sequentially execute necessary commands at a precise time, rather than transmitting real-time commands directly to the satellites on the ground. In addition, it is possible to predict the abnormal situation that can occur in the satellite, to store the command necessary for the recovery procedure by designating the execution time, and to automatically perform the recovery procedure command sequence when the abnormal situation is detected, have.

Description

Technical Field [0001] The present invention relates to a system and a method for automating satellite command execution according to execution time order,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and a method for automating satellite command execution according to execution time order, and more particularly, to a system and an apparatus in which commands to be executed in a satellite are automatically executed according to the execution time order.

Geostationary satellites can always communicate with the ground, so they can control the satellites by sending commands from the ground at a specified time so that they can perform their mission. However, when a command transmitted from the ground is executed on a satellite, a program such as IP (Internet Protocol) is used, and an IP program is different from a satellite command processing logic transmitted on the ground, And development time is required.

In addition, low orbit satellites, which seem to move relatively faster than the earth's rotating speed, have a short communication time with the ground, which makes it difficult to transmit commands to the satellites accurately on the ground within a limited time. Even if an emergency situation such as a satellite failure occurs in a low earth orbit satellite during a time when ground and communication can not be performed, it is inconvenient to control the satellite because it is impossible to transmit an instruction for restoring the abnormal situation on the ground.

KR 0224563 B

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a method and system for performing a satellite command according to an execution time order, An automation system and method.

According to an embodiment of the present invention, there is provided an automation system for executing a satellite command according to an execution time order, comprising: extracting execution time information of a storage command and outputting the extracted execution time information to an OBT on-board time format; an execution time determination unit for comparing the execution time of the storage command converted into the absolute time of the OBT format with the current OBT of the satellite to determine whether to execute the storage command; An execution unit for executing a save command determined as a target of execution by the execution time determination unit when the execution time of the storage command coincides with the current OBT of the satellite, And a storage command scheduling unit for storing a storage command that has not yet reached the current OBT and has not yet been executed.

The storage command scheduler may map the unexecuted storage command to the execution order pointer according to the execution time order and store the stored execution command in the storage table, and the first storage command to be executed first may be located at the first position of the storage table .

The execution time determiner may determine whether to execute the first storage command by comparing the execution time of the first storage command stored in the first location of the storage table with the current OBT of the satellite every predetermined period.

The storage command scheduler may move the second storage command having the pointer value corresponding to the next execution order of the first storage command to the first position of the storage table when the first storage command is executed.

The relative time command set includes a plurality of storage commands whose execution time is relatively defined, and the execution time determiner defines, when the relative time command set is activated, the plurality of storage commands based on the current time of the satellite The relative execution time can be converted into an absolute time.

According to another aspect of the present invention, there is provided a method for automating satellite command execution according to an execution time order, the method comprising: extracting execution time information of a storage command and transmitting the extracted execution time information to an OBT comparing the execution time of the storage command converted into the absolute time of the OBT format with the current OBT of the satellite to determine whether to execute the storage command;

Executing a storage command determined to be performed when the execution time of the storage command coincides with a current OBT of the satellite, and if the execution time of the storage command does not reach the current OBT of the satellite, And storing the command.

Wherein the step of storing the unexecuted store instruction stores the unexecuted store instruction in an execution sequence pointer according to an execution time order and stores the unexecuted store instruction in a store table, Th position.

Comparing the execution time of the first storage command stored in the first location of the storage table with the current OBT of the satellite every predetermined period to determine whether to execute the first storage command, When the execution time and the current OBT of the satellite coincide with each other and the first storage command is executed, a second storage command having a pointer value corresponding to the next execution order of the first storage command is moved to the first position of the storage table .

According to the present invention, a system and method are provided in which a corresponding command is automatically performed according to an execution order when an execution time arrives by using a satellite command having an execution time defined. Therefore, So that necessary commands can be sequentially executed at the correct time.

Also, during the time when the ground and communication are impossible, the satellite can automatically execute the storage command at the predetermined execution time to carry out its assigned tasks, so that the low-orbit satellite can be easily performed and operated.

In addition, it is possible to predict the abnormal situations that can occur in the satellite and to store the commands necessary for the recovery procedure by designating and storing the execution time, so that if the abnormal situation is detected, the recovery procedure command sequence is automatically executed. have.

FIG. 1 is a block diagram illustrating a system for automating satellite command execution according to an execution time order according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a method of automating satellite command execution according to an execution time order according to an embodiment of the present invention; and FIG.
3 is a flowchart illustrating a method of automating satellite command execution according to an execution time order according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

1 is a block diagram illustrating a system for automating satellite command execution according to an execution time order according to an embodiment of the present invention.

1, the storage command processing system 1 includes an execution time determination unit 100, an execution time determination unit 200, a storage instruction scheduling unit 300, and a storage instruction execution unit 400 .

A store command is a satellite command in which commands necessary for carrying out a series of procedures on a satellite are stored in a satellite store. The store command is mapped to the execution time of the satellite command and stored in the satellite store, and includes an absolute time storage command (a) and a relative time storage command (b).

The absolute time storage command (a) is a storage command in which the execution time of a corresponding storage command is expressed in an absolute-time form. When the absolute time is reached at a specified time, the command is immediately executed in the satellite.

The relative time storage command (b) is a storage command in which the execution time is expressed in the form of a relative time (delta-time) having a relative execution time interval between each command. When the execution time is activated at a specific point in time in the satellite, . The corresponding command is executed corresponding to the absolute time converted from the satellite.

The on-board time (OBT) used in satellites is the time information used by the satellites and can be displayed in various formats depending on the satellites, and the satellite OBT generally uses a counter value incremented every time the satellite flight software is executed . According to the satellite, the size of 6-12 bytes is allocated to the satellite OBT, and the absolute time or relative time mapped to the storage command can represent the satellite OBT with a smaller value.

When a command is transmitted from the ground to a satellite, it is required to minimize the length of the command due to the communication speed restriction as well as the communication time with the ground. Therefore, the execution time mapped to the storage command can be represented in the form of absolute time or relative time, which occupies a smaller size than the satellite OBT. However, in order to determine the time at which the absolute time storage command (a) or the relative time storage command (b) is executed in the satellite, the execution time expressed in absolute time or relative time form must be converted into the OBT time type used in the satellite .

On the other hand, an absolute time storage command (a) transmitted from the ground or a relative time storage command (b) activated by satellite flight software is input to the storage command processing system (1).

The execution time determining unit 100 may extract the execution time and convert the execution time into the absolute time of the OBT format used in the satellite when the storage command is input. When the extracted execution time is expressed in an absolute time format, the execution time determination unit 100 converts the execution time information into the absolute time of the OBT format used in the satellite, and transmits the absolute time to the execution time determination unit 200.

 When the relative time storage instruction (b) is input and the execution time is expressed in the relative time type, the execution time determining unit (100) converts the relative time into the absolute time type and outputs the converted absolute time storing instruction (a) To the determination unit (200).

Meanwhile, the relative time storage command (b) may be composed of one or more Relative-Timed Commands Sequence (RTCS). The storage commands belonging to one storage command group (RTCS) form one chain in the order to be executed, and each storage command has a relative time, and the next command is executed after the previous command is executed, .

For example, when one RTCS is activated at the time of the satellite OBT 100, the time at which the OBT is added to the relative time of the command to be performed first becomes the absolute time at which the command is to be executed, The absolute time at which each command should be executed is calculated based on the absolute time calculated in step S6.

That is, the three relative time storage instructions (b)

RTC_01: delta-time = 10 /

RTC_02: delta-time = 12 /

RTC_03: delta-time = 15 /

If one set of representations (RTCS) is activated at the time of the satellite OBT 100,

RTC_01: Instruction execution time = 110 /

RTC_02: Instruction execution time = 122 /

RTC_03: Instruction execution time = 137 /

Can be converted into an absolute time storage instruction (a). Since the converted instructions have absolute time to be executed, the command execution procedure can be performed when the absolute time arrives.

In particular, since the relative time storage command (b) has a relatively long execution time interval between each instruction on a series of instruction sequences, it is possible to execute an instruction execution procedure requiring execution at an accurate time interval.

That is, when the corresponding sequence is activated by a separate instruction at a required time, the relative time storage instruction (b) can be automatically performed at a precise time. Accordingly, when a problem is issued to the satellite during a period in which communication with the ground is impossible, the procedure for recovering the problem situation can be performed automatically and accurately.

The execution time determination unit 200 determines whether the execution time of the received storage command is reached. That is, the absolute time of the OBT format included in the storage command is compared with the current OBT of the satellite to determine whether or not the storage command is performed.

When the execution time coincides with the current OBT of the satellite, the execution time determination unit 200 delivers the storage command to the storage command execution unit 400, and the storage command execution unit 400 executes the received storage command.

When the execution time does not reach the current OBT of the satellite and the storage command can not be executed, the execution time determination unit 200 transmits the storage command to the storage command scheduling unit 300 and stores the storage command.

Then, the execution time determination unit 200 requests the storage command scheduling unit 300 to compare the execution time of the first storage command located at the first position in the storage table with the current OBT of the satellite to determine whether to execute the first storage command do. Whether or not the first storage command is executed may be repeatedly performed at predetermined intervals.

The storage command scheduling unit 300 receives a storage command that has not yet reached the execution time from the execution time determination unit 200 and stores the received storage command in the storage table. The store instruction is mapped to an execution order pointer value indicating a store instruction to be executed next, and is stored in a storage table in a linked-list form according to the execution order.

Therefore, when the save command is transmitted, the save command scheduler 300 changes the execution order pointer value in accordance with the execution time order, and stores the save command to be performed first in the first storage in the storage table.

The execution time of the first storage command located in the first storage is compared with the current OBT of the satellite in the execution time determination unit 200, and the first storage command can be determined whether or not the command is executed for each system internal cycle.

When the execution time of the first storage command arrives and the first storage command is executed, the storage command scheduler 300 stores the second storage command having the pointer value corresponding to the next execution order of the first storage command in the storage table To the first position, and to change the execution order pointer value according to the execution order of the storage instructions, thereby scheduling the storage instructions stored in the storage table.

2 is a flowchart illustrating a method of automating satellite command execution according to an execution time order according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, the execution time determining unit 100 extracts the execution time from the input storage command (S100). When the extracted execution time is expressed in an absolute time format, the execution time determination unit 100 converts the execution time information into the absolute time in the satellite OBT format and transfers the absolute time to the execution time determination unit 200.

On the other hand, when the relative time storage instruction (b) is input and the execution time is expressed in the relative time type, the execution time determining unit 100 converts the relative time into the absolute time type and outputs the converted absolute time storing instruction (a) To the execution time determination unit (200).

Next, the execution time determination unit 200 compares the execution time of the received storage command with the current OBT of the satellite to determine whether to execute the storage command (S120). If it is determined that the execution time and the current OBT of the satellite coincide with each other (S120-Y), the execution time determination unit 200 transmits the storage command to the storage command execution unit 400 so that the storage command is executed (S140) .

If it is determined that the execution time does not reach the current OBT of the satellite (S120-N), the execution time determination unit 200 transmits the storage command to the storage command scheduling unit 300 and stores it (S160).

Accordingly, when an unexecuted store instruction is transmitted, the store instruction scheduler 300 maps the store instruction to the execution order pointer value and stores it in the storage table in the linked-list form in the execution order.

The plurality of storage commands may be stored in the storage table irrespective of the execution order, but the storage command scheduler 300 stores the first storage command to be performed first in the storage in the first storage in the storage table.

3 is a flowchart illustrating a method of automating satellite command execution according to an execution time order according to another embodiment of the present invention.

Referring to FIGS. 1 and 3, the execution time determination unit 200 compares the first storage command of the storage table with the current OBT of the satellite (S200). The execution time determination unit 200 may request the storage command scheduling unit 300 to compare the execution time of the first storage command with the current OBT of the satellite to determine whether or not to execute the storage command.

If it is determined that the execution time of the first storage command coincides with the current OBT of the satellite (S200-Y), the execution time determination unit 200 transmits the first storage command to the storage command execution unit 400, The instruction is executed in the storage instruction execution unit 400 (S220).

When the first storage command is executed, the storage command scheduler 300 moves the second storage command having the pointer value corresponding to the next execution order of the first storage command to the first position of the storage table, It is possible to schedule stored stored instructions by changing the execution order pointer value according to the execution order.

Embodiments of the present invention include a computer-readable medium having program instructions for performing various computer-implemented operations. This medium records a program for executing a satellite command execution automation system and method according to the execution time order described so far. The medium may include program instructions, data files, data structures, etc., alone or in combination. Examples of such media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD and DVD, programmed instructions such as floptical disk and magneto-optical media, ROM, RAM, And a hardware device configured to store and execute the program. Or such medium may be a transmission medium, such as optical or metal lines, waveguides, etc., including a carrier wave that transmits a signal specifying a program command, data structure, or the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

Storage command processing system: 1 Execution time determination part: 100
Execution time determining unit: 200: Instruction for storing instruction: 300
Executing the store instruction execution part: 400

Claims (8)

delete An execution time determination unit for extracting execution time information of a storage command and converting the extracted execution time information into an absolute time of an OBT (on-board time) format used in a satellite,
An execution time determiner for comparing the execution time of the storage command converted into the absolute time of the OBT format with the current OBT of the satellite to determine whether to execute the storage command,
An instruction execution unit for executing a storage instruction determined to be executed by the execution time determination unit when the execution time of the storage instruction coincides with the current OBT of the satellite,
A storage command scheduling unit for storing a storage command that has not yet been executed because the execution time of the storage command has not reached the current OBT of the satellite;
Lt; / RTI >
Wherein the storage command scheduler comprises:
A first storage instruction to be executed first is stored in the storage table, and a first storage instruction to be executed first is stored in the storage table, Performance automation system. 3. The method of claim 2,
The execution-
And comparing the execution time of the first storage command stored in the first location of the storage table with the current OBT of the satellite for each predetermined period to determine whether to execute the first storage command, system. 4. The method of claim 3,
Wherein the storage command scheduler comprises:
When the first storage command is executed, moving a second storage command having a pointer value corresponding to a next execution order of the first storage command to a first position of the storage table, Performance automation system. An execution time determination unit for extracting execution time information of a storage command and converting the extracted execution time information into an absolute time of an OBT (on-board time) format used in a satellite,
An execution time determiner for comparing the execution time of the storage command converted into the absolute time of the OBT format with the current OBT of the satellite to determine whether to execute the storage command,
An instruction execution unit for executing a storage instruction determined to be executed by the execution time determination unit when the execution time of the storage instruction coincides with the current OBT of the satellite,
A storage command scheduling unit for storing a storage command that has not yet been executed because the execution time of the storage command has not reached the current OBT of the satellite;
Lt; / RTI >
The relative time instruction set includes a plurality of store instructions whose execution time is relatively defined,
Wherein the execution time determination unit
And converting the relative execution time defined in each of the plurality of storage commands into an absolute time based on the current time of the satellite when the relative time command set is activated. delete Extracting execution time information of a storage command and converting the extracted execution time information into an absolute time of an OBT (on-board time) format used in a satellite,
Comparing the execution time of the storage command converted to the absolute time of the OBT format with the current OBT of the satellite to determine whether to execute the storage command,
Executing a save command determined to be performed when the execution time of the save command matches the current OBT of the satellite; and
Storing an unexecuted save command if the execution time of the save command does not reach the current OBT of the satellite
Lt; / RTI >
Wherein the step of storing the non-
A first storage instruction to be executed first is stored in the storage table, and a first storage instruction to be executed first is stored in the storage table, How to automate performance. 8. The method of claim 7,
Comparing the execution time of the first storage command stored in the first location of the storage table with the current OBT of the satellite every predetermined period to determine whether to perform the first storage command,
And a second storage command having a pointer value corresponding to a next execution order of the first storage command when the execution time of the first storage command coincides with the current OBT of the satellite, To the first position
Further comprising the steps of:

Images