KR102186315B1 - Method and apparatus for fast sampling of data of satellite state variables - Google Patents

Abstract

Provided are a method and apparatus for efficiently sampling data of satellite state variables to quickly transmit state variable information transmitted by telemetry without omission. According to an embodiment of the present invention, a telemetry transmission method performed in a minor cycle sampling (MCS) mode by a satellite computing device comprises the steps of: receiving a satellite command including information on a target state variable and minor cycle (MC) time information respectively designating a sampling target and an MC time to perform sampling from a satellite control system; acquiring data of the target state variable at the MC time; and transmitting telemetry including an information frame including an address, the length, and the MC time information of the target state variable, and a data frame configured according to the information frame.

Description

Method and apparatus for sampling data of satellite state variables {METHOD AND APPARATUS FOR FAST SAMPLING OF DATA OF SATELLITE STATE VARIABLES}

The present invention relates to a method and apparatus for sampling data of a satellite state variable. In more detail, it relates to a method and apparatus for sampling data of a state variable transmitted through satellite telemetry.

Since the transmission period of the telemetry transmitted from the satellite to the satellite control system is slower than the operation period of the satellite software, it is not possible to completely observe the change of the state variables of the satellite in the satellite control system by the general telemetry transmission method.

Particularly, when a satellite is required to collect state information in units of a minor cycle (MC) and transmit state information to the ground, conventionally, state variable sampling is performed for each MC, so that the sampling is performed for an MC that does not need to perform sampling. Accordingly, when the size of the sampled state variable data exceeds 198 bytes, which is the maximum size of the telemetry data frame, there is a problem that some of the sampled state variable data cannot be transmitted through telemetry. Accordingly, there is a need to provide a technology capable of efficiently transmitting sampled data using a limited-sized telemetry data frame space.

The technical problem to be solved by the present invention is to provide a method and an apparatus for efficiently performing sampling of state variables in order to quickly transmit state variable information transmitted by telemetry without omission.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above technical problem, a telemetry transmission method performed in a minor cycle sampling (MCS) mode by a satellite computing device according to an embodiment of the present invention includes a sampling target and an MC to perform sampling from a satellite control system. (minor cycle) receiving a satellite command including information on a target state variable specifying a time and information on an MC time, acquiring data on the target state variable at the MC time, and an address of the target state variable, It may include transmitting a telemetry including a length, an information frame including the MC time information, and a data frame configured according to the information frame.

The MC time according to an embodiment has a unit of a minimum operation period obtained by dividing 1 second, which is a period for transmitting the telemetry, by a preset frequency, and is defined as an offset for a time for transmitting the telemetry, and the The MCS mode may be a mode capable of sampling at least one target state variable at at least one MC time by the satellite computing device.

The satellite according to an embodiment includes a memory that is accessible by the computing device and stores data of a plurality of state variables, and the obtaining step comprises: at the address of the target state variable of the memory at the MC time. And acquiring data of the target state variable by the length of the target state variable.

In the data frame according to an embodiment, data of the target state variable may be stored according to an order of the target state variable included in the information frame.

The data frame according to an embodiment includes data of a first number of state variables sampled at a first MC time, and data of a second number of state variables sampled at a second MC time, and the satellite control system The MC time information received from may include the first MC time information and the second MC time information.

According to an embodiment, a first number of state variables sampled at the first MC time and a second number of state variables sampled at the second MC time may be set by the satellite command to be independent of each other.

In order to solve the above technical problem, a satellite computing device according to another embodiment of the present invention monitors state variables of a memory and a satellite in a minor cycle sampling (MCS) mode and stores the data of the state variables into a preset address of the memory. A monitoring unit stored in the satellite control system, a receiving unit receiving a satellite command including information on a target state variable and MC time information that respectively designate a sampling target and an MC (minor cycle) time to perform sampling from the satellite control system, and at the MC time Transmitting a telemetry including an acquisition unit acquiring the data of the target state variable, an information frame including the address, length, and MC time information of the target state variable, and a data frame configured according to the information frame It may include a transmission unit to.

1 is an exemplary diagram illustrating a process of transmitting a state variable of a sampled satellite through telemetry according to an embodiment.
2 is a flowchart illustrating a method of sampling state variable data of a satellite according to an exemplary embodiment.
3 to 4 are exemplary diagrams illustrating a method of storing sampled state variable data.
5 is an exemplary diagram showing the configuration of a telemetry frame including an information frame and a data frame according to an embodiment.
6 is a block diagram illustrating a configuration and operation of a satellite computing device that performs sampling of state variable data according to an exemplary embodiment.

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

The embodiments of the present invention are provided to more completely describe the present invention to those of ordinary skill in the art, and the following embodiments may be modified in various other forms, and the scope of the present invention is It is not limited to the following examples. Rather, these embodiments are provided to make the present disclosure more faithful and complete, and to fully convey the spirit of the present invention to those skilled in the art.

The terms used in this specification are used to describe specific embodiments, and are not intended to limit the present invention. As used herein, the singular form may include a plural form unless the context clearly indicates another case. Further, as used herein, "comprise" and/or "comprising" specifies the presence of the mentioned shapes, numbers, steps, actions, members, elements and/or groups thereof. And does not exclude the presence or addition of one or more other shapes, numbers, actions, members, elements, and/or groups. As used herein, the term "and/or" includes any and all combinations of one or more of the corresponding listed items.

In the present specification, terms such as first and second are used to describe various members, regions, and/or parts, but it is obvious that these members, parts, regions, layers and/or parts should not be limited by these terms. Do. These terms do not imply any particular order, top or bottom, or superiority, and are only used to distinguish one member, region, or region from another member, region, or region. Accordingly, the first member, region, or region to be described below may refer to the second member, region, or region without departing from the teachings of the present invention.

Hereinafter, a process of transmitting telemetry by sampling a satellite state variable according to an embodiment will be described in detail with reference to FIG. 1.

When information on the state variable of the satellite is to be acquired in units of a minor cycle (MC), the computing device 20 of the satellite may perform a minor cycle sampling (MCS) mode to perform sampling of the state variable. In this case, the satellite computing device 20 may transmit the telemetry 21 including the sampled state variable data to the satellite control system 10 while continuously orbiting around the earth. The satellite control system 10 may include a device that is located outside the satellite and monitors the computing device of the satellite.

In one embodiment, the satellite command 22 including information on the state variable to be sampled and MC time information may be transmitted from the satellite control system 10 to the computing device 20 of the satellite, and the computing device 20 of the satellite ), the telemetry 21 transmitted to the satellite control system 10 may include an information frame including the address, length, and MC time information of the state variable of the satellite, and a data frame configured according to the information frame.

In one embodiment, the satellite computing device 20 is based on the information of the target state variable and the MC time information included in the satellite command 22 received from the satellite control system 10, at least one state at a specified MC time. Variable sampling can be performed. Since it is not necessary to sample the data of the satellite's target state variable every MC time, it is possible to efficiently use the storage space of the telemetry in which the data of the target state variable is stored. Detailed description will be given later in FIGS. 3 to 4.

In an embodiment, a telemetry 21 including an information frame in which information of the sampled target state variable is stored and a data frame in which data of the sampled target state variable is stored may be transmitted. Detailed description will be given later in FIG. 5.

Hereinafter, a method of sampling satellite state variable data according to an embodiment will be described in detail with reference to FIG. 2.

In step S101, when the MCS mode is performed by the satellite computing device, a satellite command including information on a target state variable and MC time information may be received from the satellite control system.

The target state variable is a state variable that needs to perform sampling among the state variables of the satellite. In addition, the information of the target state variable is an identification value of the target state variable, for example, the information of the target state variable is an address value of a target state variable stored in a memory of a computing device of a satellite or an identification value unique to a state variable. I can.

The MC time information is information on the MC time at which each target state variable is sampled. The MC time may have a unit of a minimum operation period obtained by dividing 1 second, which is a period for transmitting telemetry, by a preset frequency. For example, when the preset frequency is 8 Hz, the minimum operation period of the MC time may be 1/8 second.

In addition, the MC time may be defined including offset information for the minimum operation period and the time for transmitting the telemetry. For example, if the minimum operation period of the MC time is 1/4 second and the offset is 2, the sampling operation is 0 seconds, the 0th operation time, and the 1st operation time, 0.25 seconds among 0 seconds, 0.25 seconds, 0.5 seconds and 0.75 seconds. It is not performed in seconds, but can be performed in 0.5 seconds. However, note that this is an example of defining the MC time, and the method of defining the MC time is not limited thereto.

In step S102, data of the target state variable may be obtained at MC time. The data of the target relative variable is accessible by the satellite computing device and can be obtained from a memory storing data of a plurality of state variables.

In an embodiment, a first number of state variables may be sampled at a first MC time and a second number of state variables may be sampled at a second MC time based on the state variable information and MC time information received from the satellite control system. have. In addition, the first number of state variables sampled at the first MC time and the second number of state variables sampled at the second MC time may be independent of each other. That is, sampling for each state variable is performed independently, and sampling for one state variable may not be affected by sampling for another state variable.

In an embodiment, data of the target state variable may be obtained from the address of the target state variable by the length of the target state variable. The acquired data of the target state variable may be stored in a data frame and transmitted through telemetry.

In step S103, an information frame including the address, length and MC time information of the target state variable and telemetry including a data frame may be transmitted.

Telemetry may include information frames and data frames. In the information frame, data used to interpret data of a state variable to be transmitted through a data frame may be stored.

The information frame may include the address of the target state variable to be sampled, the length of the target state variable data, and MC time information in which the target state variable is sampled.

The data frame may store state variable data based on an order of the target state variable in which the information frame is stored. Detailed description will be given later in FIG. 5.

Hereinafter, a method of sampling and storing data of a state variable will be described in detail with reference to FIGS. 3 to 4.

Referring to FIG. 3, when the state variable is sampled every MC time, unnecessary sampling may be performed. For example, if there is a state variable having the same data value as the data of the state variable at the previous MC time, the duplicated data may be sampled after the sampling at the first MC time is performed. When duplicated data is sampled, there arises a problem that computing resources for performing sampling and a storage space for storing duplicated data are wasted.

For example, as shown in FIG. 3, if the MC time period is 1/8 second and the number of satellite state variables is 3, if 3 state variables are sampled every MC time, 24 state variable data are converted into telemetry ( 200) and transmitted.

On the other hand, referring to FIG. 4, when only a specified state variable is sampled at a specified MC time according to an embodiment, unnecessary sampling may not be performed. For example, even if there is a state variable having the same data value as the data of the state variable at the previous MC time, sampling is performed on the data of the redundant state variable after sampling is performed at the first MC time according to this embodiment. May not be. In this way, when sampling state variables having duplicate data values is not performed, waste of computing resources and storage space can be minimized.

For example, as illustrated in FIG. 4, when the MC time period is 1/8 second and the number of state variables of the satellite is 3, the frequency and sampling period at which the state variables are sampled may be different according to the importance of the state variables. When referring to the state variable 0 to the state variable 2 shown in Fig. 4, the data of the state variable 0 and the state variable 1 are sampled at MC time 00, the state variable 0 is sampled at MC time 01, and the state variable 0 at MC time 02. , State variable 1 and state variable 2 can be sampled. By not performing sampling on the state variables of low importance, the data frame storage space 210 as large as the data size of 10 state variables may be used. That is, compared to the data frame storage space 200 shown in FIG. 3 used as much as 24 state variable data sizes, the storage space may be saved as much as 14 state variable data sizes. However, the fact that the sampling frequency and period of the state variable may be different depending on the importance of the state variable is only an example of a method of selectively performing sampling, and the sampling frequency and period of the state variable according to the command of various satellite control systems Be aware that it can be different.

Also, in an embodiment, each state variable may be independent. Data of a first number of state variables may be sampled at a first MC time, and data of a second number of state variables may be sampled at a second MC time. In this case, a satellite command including information on the first number of target state variables to be sampled at the first MC time, and the second number of target state variables to be sampled at the second MC time from the satellite control system Receive That is, whether one state variable is sampled may not affect the other state variable's sampling.

For example, referring to FIG. 4, even if the state variable 0 is sampled at the MC time O4 and the MC time O6, the state variable 1 may not be sampled. Similarly, even if the state variable 1 is sampled at the MC time O1, the state variable 0 and the state variable 2 may not be sampled.

Hereinafter, a configuration of a telemetry frame including an information frame and a data frame according to an embodiment will be described in detail with reference to FIG. 5.

In one embodiment, the telemetry 300 of a frame composed of an information frame 310 in which information of a target state variable is stored and a data frame 320 in which data of a target state variable is stored may be transmitted.

The information frame 310 may include information related to a target state variable to be sampled. The information related to the target state variable may be information used when analyzing the target state variable by a satellite control system that has received telemetry afterwards. For example, the information related to the target state variable may include the address of the target state variable, the length of the target state variable data, and MC time information in which the target state variable is sampled.

The data frame 320 may include data of the target state variable based on the order of the target state variable in which the information frame is stored. In an exemplary embodiment, when information of state variables is stored in the order of 1 to N in the information frame 310, data from the first state variable to the Nth state variable may be stored in the data frame 320. In addition, the state variable data included in the data frame 320 may be data obtained from a memory by the length of the state variable at the address of the state variable included in the information frame 310.

6 is a block diagram illustrating a configuration and operation of a satellite state variable data sampling apparatus according to an exemplary embodiment.

In one embodiment, the satellite computing device 100 for sampling satellite state variable data includes a receiving unit 110, an acquisition unit 120, a memory 130, and a transmission unit 150, and in some embodiments, a storage unit ( 140) may be further included.

In an embodiment, the receiving unit 110 may receive a command transmitted from a satellite control system on the ground. The satellite control system may include a device that is located outside the satellite and monitors the computing device of the satellite. The command transmitted from the satellite control system may include a target state variable and MC time information. In addition, when there is no available space for sampling in the satellite computing device, the receiver 110 may transmit information indicating that the available space is insufficient to the satellite control system. For example, when the size of the data of the state variable to be sampled exceeds the maximum size (192 bytes) of the telemetry data frame, the receiver 110 is a satellite control system, and the data size of the state variable and the data of the telemetry Information on the size of the available space of the frame can be transmitted.

In an embodiment, the acquisition unit 120 may acquire state variable data from the memory 130 of the satellite computing device. The acquisition unit 120 may compare the MC time received from the satellite control system with the current time point and obtain data of the target state variable from the memory 130 at the sampling time point. In this case, the acquisition unit 120 may acquire data corresponding to the length of the target state variable from the target state variable address of the memory 130.

In an embodiment, the memory 130 may store data of state variables of a satellite. The memory 130 may acquire data of the state variables from a monitoring unit (not shown) that monitors state variables of a satellite, and may store the data of the acquired state variables in a preset address. In addition, the memory 130 may transmit the data of the stored state variable to the acquisition unit 120.

In one embodiment, the storage unit 140 stores the information of the target state variable received from the satellite control system by the receiving unit 110 and the data of the state variable obtained by the acquisition unit 120 from the memory 130 as telemetry information. It can be stored in a frame or data frame. The telemetry frame may include an information frame in which information of a target state variable is stored and a data frame in which data of a target state variable is stored.

In an embodiment, the transmission unit 150 may transmit the telemetry frame stored in the storage unit 140 to the satellite control system using telemetry. In an embodiment, the transmission unit 150 may transmit the information frame included in the telemetry frame before the data frame. The satellite control system receives the information frame before the data frame, so that a method of analyzing data to be received through the data frame can be established early.

Each of the steps of the method according to the present invention may be performed in an appropriate order, provided that the order is not explicitly stated or contradicted. The present invention is not limited to being performed according to the described order of each step. In the present invention, the use of all examples or illustrative terms (for example, etc.) is only for describing the present invention in detail, and the use of the examples or illustrative terms is not limited by the claims of the present invention. The scope is not limited. In addition, one of ordinary skill in the art may recognize that design conditions and factors may be modified within the scope of the claims or their equivalents.

Therefore, the spirit of the present invention should not be limited to the above-described embodiments, and not only the claims to be described later, but also all ranges equivalent to or equivalently changed from the scope of the present invention. It will be said to belong to the category.

Claims (13)

In the telemetry transmission method performed in a minor cycle sampling (MCS) mode by a satellite computing device,
Receiving a satellite command including information on a target state variable and MC time information respectively designating a sampling target and an MC (minor cycle) time to perform the sampling from a satellite control system;
Acquiring data of the target state variable only at the MC time; And
Transmitting telemetry including an information frame including the address, length, and MC time information of the target state variable, and a data frame configured according to the information frame;
Telemetry transmission method comprising a. The method of claim 1,
The MC time has a unit of a minimum operation period obtained by dividing 1 second, which is a period of transmitting the telemetry, by a preset frequency, and is defined as an offset to the time of transmitting the telemetry,
The MCS mode,
A telemetry transmission method in a mode capable of sampling at least one target state variable at at least one MC time by the satellite computing device. The method of claim 1,
The satellite is accessible by the computing device and includes a memory for storing data of a plurality of state variables,
The obtaining step,
And acquiring data of the target state variable by the length of the target state variable from the address of the target state variable in the memory at the MC time. The method of claim 1,
The data frame,
Telemetry transmission method in which the data of the target state variable is stored according to the order of the target state variable included in the information frame. The method of claim 1,
The data frame,
Including data of a first number of state variables sampled at a first MC time, and data of a second number of state variables sampled at a second MC time,
The MC time information received from the satellite control system,
Telemetry transmission method including the first MC time information and the second MC time information. The method of claim 5,
A telemetry transmission method in which a first number of state variables sampled at the first MC time and a second number of state variables sampled at the second MC time are set by the satellite command to be independent of each other. In a satellite computing device that transmits telemetry in a minor cycle sampling (MCS) mode,
Memory;
A monitoring unit for monitoring state variables of the satellite and storing data of the state variables in a preset address of the memory;
A receiver configured to receive a satellite command including information on a target state variable and MC time information respectively designating a sampling target and a minor cycle (MC) time to perform sampling from the satellite control system;
An acquisition unit that acquires data of the target state variable only at the MC time; And
A transmission unit for transmitting a telemetry including an information frame including the address, length, and MC time information of the target state variable, and a data frame configured according to the information frame;
Satellite computing device comprising a. The method of claim 7,
The MC time has a unit of a minimum operation period obtained by dividing 1 second, which is a period of transmitting the telemetry, by a preset frequency, and is defined as an offset to the time of transmitting the telemetry,
The MCS mode,
A satellite computing device in a mode capable of sampling at least one target state variable at at least one MC time by the satellite computing device. The method of claim 7,
The memory,
The satellite is accessible by the computing device and data of a plurality of state variables are stored,
The acquisition unit,
A satellite computing device that acquires data of the target state variable by the length of the target state variable from the address of the target state variable in the memory at the MC time. The method of claim 7,
The data frame,
A satellite computing device in which data of the target state variable is stored according to the order of the target state variable included in the information frame. The method of claim 7,
The data frame,
Including data of a first number of state variables sampled at a first MC time, and data of a second number of state variables sampled at a second MC time,
The MC time information received from the satellite control system,
Satellite computing device including the first MC time information and the second MC time information. The method of claim 11,
A satellite computing device that is set by the satellite command so that a first number of state variables sampled at the first MC time and a second number of state variables sampled at the second MC time are independent of each other. A computer-readable recording medium on which a program for performing the method according to any one of claims 1 to 6 is recorded.

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