JPH08304557A - Level zero-conversion processing equipment - Google Patents

Abstract

PURPOSE: To execute the conversion of level 0 data containing a track predicted value into level 0 data containing a track determined value in a short time with minimum hardware used. CONSTITUTION: Level 0 data containing a track predicted value are assumed to be recorded on a magnetic tape in an ANSI DI format, for instance. A computer 5 holding a track determined value, a data recorder 1 controlled by the computer 5, a data recorder interface 2 executing input/output of data for the data recorder 1 and a memory 3 storing the data to be inputted to or outputted from the data recorder 1 through the intermediary of the data recorder interface 2 are provided. The magnetic tape being reproduced first, information containing the track predicted value is read in the memory 3, this track predicted value is updated by the track determined value held by the computer and an updated track determined value is written in the part on the magnetic tape wherein the track predicted value has been written.

Description

Detailed Description of the Invention

The present invention relates to a recording / processing system in an earth station for receiving and processing data from artificial satellites such as remote sensing satellites and earth observation satellites, and more particularly to level 0 conversion processing for processing level 0 data. Regarding the device.

[0002]

2. Description of the Related Art When receiving mission data obtained by observation with artificial satellites such as remote sensing satellites and performing processing (higher-order processing) such as image processing and data analysis, the transmitted mission data remains unchanged. First, it is necessary to execute the level 0 processing for converting this data into a data form or format suitable for the processing in the computer. Information about the satellite orbit is added to the data obtained by the level 0 processing. By the way, the exact orbit (orbit determination value) of the satellite is determined separately by observation, so only the orbit prediction value can be obtained when the mission data from the satellite is received. To make it extremely small,
It is necessary to use the definite trajectory value.

FIG. 2 (a) is a block diagram showing an example of a conventional device for obtaining level 0 data to which a definite trajectory value is added. In this device, when the mission data from the satellite is received, the raw data is recorded on the tape by the high-density digital recording device 91 as it is. Then, when the orbit of the satellite is confirmed, the raw data tape is played back and converted to synchronized mission data by the synchronizing board 92,
The formatter 93 converts the level 0 format data in the specified format. No information about satellite orbits is added at the level 0 format data stage. Then, the trajectory determination value information is transferred from the computer 97 to the memory 96 and temporarily stored. When the level 0 format data is input from the formatter 93 to the data recorder interface (data recorder I / F) 94 and the trajectory determination value information is input from the memory 96, the data recorder I / F
94 produces | generates the level 0 data which added the orbit determination value, and outputs it to the data recorder 95. As a result, the level 0 data including the orbit determination value is recorded by the data recorder 95. The computer 97 also executes reproduction control for the high-density digital recording device 91, recording control for the data recorder 95, and control for the formatter 93.

Further, when the mission data is received from the satellite, it is possible to prepare the level 0 data having the prescribed format format with the orbit prediction value added thereto in real time and record it on the tape. In this case, when the definite value of the orbit orbit is determined at a later date, the process of rewriting the orbit predicted value to the orbit determination value is executed. Conventionally, this processing is performed by first using a device as shown in FIG.
The data recorder 95a reproduces the tape on which the level 0 data having the orbit prediction value is recorded, and the level 0
The data is input to the data recorder I / F 94. The data recorder I / F 94 extracts information including the trajectory prediction value from the input level 0 data and stores it in the memory 96.
Then, the computer 97 replaces the trajectory predicted value on the memory 96 with the trajectory determined value, and the information including the trajectory determined value is transferred from the memory 96 to the data recorder I / F 94. As a result, the level 0 data in which the orbit determination value is added and in the specified format is output from the data recorder I / F 94 and recorded on another tape in the second data recorder 95b.

[0005]

The conventional level 0 processing requires a time equal to or longer than the reception time from the satellite,
Moreover, two data recorders (or high-density digital recording devices) and an interface device are required. In addition, since the mission data is copied from one tape to another tape, the data also deteriorates. Furthermore, although the level 0 processing itself is automatically executed by the computer software, it is necessary for this software to control one of the two data recorders while reproducing the other and synchronizing the other for recording. There is software and operational complexity.

The object of the present invention is to reduce the hardware resources by shortening the time required for the level 0 processing by reducing the number of data recorders required for the conventional level 0 processing to one. Level 0 that can eliminate data deterioration due to copying of mission data at the time and can simplify software for Level 0 processing
It is to provide a conversion processing device.

[0007]

The level 0 conversion processing apparatus of the present invention is intended for a magnetic tape in which level 0 data in which the orbit prediction value of the artificial satellite is added to the mission data from the artificial satellite is recorded. A level 0 conversion processing device for converting the predicted trajectory value into a trajectory determination value, the computer retaining the trajectory determination value, and recording and reproducing from the magnetic tape under the control of the computer. A data recorder that performs data, a data recorder interface that inputs and outputs data to and from the data recorder in synchronization with a clock, and a memory that is connected to the computer and that stores data that is input to and output from the data recorder via the data recorder interface. And the information including the predicted trajectory value is read into the memory to determine the trajectory. By being updated by,
The orbit determination value is written in the portion of the magnetic tape where the orbit prediction value was written.

[0008]

In the conventional high-density digital recording device or data recorder, a specific location on the magnetic tape can be designated and data can be recorded or reproduced from the location, or a location on the magnetic tape can be recorded. It was difficult to recognize accurately. However, for example, in a data recorder according to the ANSI D1 standard, it is possible to specify a recording / reproducing position on the magnetic tape and write / read data to / from the position. In the present invention, the data recorder capable of designating the recording / reproducing position on the magnetic tape and the recording format for the corresponding magnetic tape (for example, ANS) are used in the present invention.
ANSI D for the ID1 standard data recorder
1 format), by rewriting only the portion of the orbit prediction value of the level 0 data recorded on the magnetic tape with the orbit determination value, the mission data can be simply copied without being copied. The apparatus and the software can convert the level 0 data of the predicted value of the trajectory into the level 0 data of the determined value of the trajectory in a short time.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a level 0 conversion processing apparatus according to an embodiment of the present invention.

This level 0 conversion processing device is based on ANSI.
The data recorder 1 according to the D1 standard, the data recorder interface 2 for inputting / outputting data to / from the data recorder 1 in synchronization with a clock, and the data input / output from the data recorder 1 via the data recorder interface 2 are temporarily stored. The memory 3, the computer 5 for holding the orbit determination value and performing the recording / reproducing control for the data recorder 1, and the memory 3 and the computer 5 are connected so that the computer 5 can instruct reading / writing and control of the memory 3. And a general-purpose interface 4 for In addition to this, the computer 5 is also equipped with software for monitoring and controlling each of these parts.

Next, the operation of this device will be described. In advance
It is assumed that the level 0 data including the orbit prediction value is recorded on the magnetic tape in the ANSI D1 format. First,
This magnetic tape is reproduced by the data recorder 1, and only the portion of the data of the trajectory prediction value on the tape is taken into the memory 3 via the data recorder interface 2. As a result, the information including the trajectory prediction value loaded in the memory 3 is
By the control of the computer 5, the trajectory determination value 5 held by the computer is updated via the general-purpose interface 4. The updated information including the orbit determination value on the memory 3 is written in the same portion of the reproduced magnetic tape in the data recorder 1 via the data recorder interface 2. As a result, the magnetic tape of the level 0 data of the predicted trajectory value is converted into the level 0 data tape of the determined trajectory value.

[0012]

As described above, according to the present invention, a magnetic tape equivalent to that produced by the conventional level 0 processing is produced with the minimum necessary hardware configuration as compared with the level 0 processing up to now. It is possible to reduce the frequency of failures due to the reduction in the number of devices. Further, by using the level-0 conversion processing device of the present invention, the level-0 processing time, which was conventionally required to be equal to or longer than the reception time from the satellite, can be greatly reduced. Since only one data recorder is used, it is not necessary to synchronize the two data recorders, and software processing can be simplified. Further, since the operability is also improved, there is also an effect that operation mistakes are reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a level-0 conversion processing device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional level 0 processing method,
(a) is a figure which shows the level 0 conversion process from raw data to a trajectory decision value, (b) is a figure which shows the conversion process from a trajectory prediction value level 0 data to a trajectory decision value level 0 data.

[Explanation of symbols]

 1 data recorder 2 data recorder interface 3 memory 4 general-purpose interface 5 computer

Claims (2)

[Claims] 1. A level 0 conversion for converting a predicted orbit value into an orbit determination value for a magnetic tape in which level 0 data in which a predicted satellite value of the artificial satellite is added to mission data from the artificial satellite is recorded. A processing device, a computer that holds the orbit determination value, a data recorder that records on the magnetic tape and reproduces from the magnetic tape under the control of the computer, and a data recorder that synchronizes with a clock. A data recorder interface that inputs and outputs data, and a memory that is connected to the computer and stores data that is input to and output from the data recorder via the data recorder interface, and the information including the trajectory prediction value is the The magnetic tape is read by being read into a memory and updated by the orbit determination value. In Level 0 transform processing device the orbit determination value in the portion where the trajectory predicted value is written is written. 2. The level 0 data is recorded on the magnetic tape in ANSI D1 format.
The level 0 conversion processing device described in 1.