JPH07114404B2 - Remote sensing data distribution system - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a remote sensing data processing and utilization system for observing the earth using artificial satellites, and particularly relates to a system other than that after the processing has received a specific permission. The present invention relates to a data distribution system suitable for preventing illegal use by users.

[Background of the Invention]

Remote sensing, which monitors and investigates the condition of the surface of the earth using satellites, is used in many fields. A typical example is the fishery remote sensing system. The contents of the system are described in the article "Development of fishery remote sensing image processing system" by Honma et al.
Are described in. The system processes the infrared image observed by the meteorological satellite by the image processing system of the center, creates a drawing showing the situation of the temperature distribution on the sea surface, the distribution of the tidal boundary, etc., and uses it to draw a drawing using a wireless facsimile etc. Etc. The received drawings will be used for fishing activities such as exploration of fishing grounds at fishing boats or fishing bases. In this system, data is distributed to subscribers who have wireless facsimile receivers. Here, there is a case where a sea condition drawing is added in which the information of the fishing ground sent from a fishing boat, a research boat, or the interpretation result of the image by an expert of marine fisheries is added at the center. As described above, when the remote sensing data is processed or distributed to the user with additional information added, it is necessary to protect the value of the data and, in some cases, charge a fee for receiving the data. However, the above system has a drawback that a person having a wireless facsimile receiver can intercept the distribution data even if it is not a contractor, and it is difficult to protect the value of the data or make a proper charge.

[Object of the Invention]

An object of the present invention is to provide a remote sensing data distribution system that solves the above-mentioned drawbacks of the conventional system and prevents interception of the distribution data by anyone other than an authorized contractor.

[Outline of Invention]

In order to achieve the above object, the present invention has the following features. That is, an observation satellite, a ground station including an observation data reception device, a reception data processing device, and a processing result data transmission device transmitted from the observation satellite, and a data reception device and reception data display from the ground station. In a remote sensing system including one or more user terminals each including an apparatus, a ground data station is provided with a transmission data encryption apparatus, and a user terminal is provided with a reception data decryption apparatus.

Example of Invention

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a remote sensing data distribution system according to the present invention. The observation satellite 1 captures the radiation 3 from the ground surface 2 by the sensor 4, converts it into an electric signal, and transmits it from the antenna 5 to the ground station 6. The ground station 6 processes and analyzes the received data to create a material such as a sea condition drawing, and transmits the material to the user terminal 7 via a wireless facsimile or the like. The user terminal 7 reproduces materials such as sea condition drawings from the received data and uses them for fishery resource exploration. Here, it is assumed that there are a plurality of user terminals 7 according to the number of users. Ground station 6
Then, the following processing is performed. The observation data sent from the antenna 5 of the observation satellite 1 is received by the antenna 8 and then processed by the processing device 9. The contents of the processing are correction of shape distortion and density distortion included in the observation data, enhancement of density of the image according to the purpose of using the data, conversion to temperature, and creation of an isotherm plot. At this time, an operator such as an expert of marine fisheries conducts interactive processing using the image display 10 and the input device 11, and inputs the interpretation result of the image regarding the tide, etc. or the information about the fishing ground collected from a separate survey ship, fishing boat, etc. May be. As a result, the sea condition drawing is completed in the processing device as a hand-drawn drawing or as digital data. This is transmitted and distributed to the user. When the oceanographic chart is in the form of digital data, it is directly input from the processing device 9 to the encryption machine 12. In the case of a handwritten drawing, the drawing 15 is input to the encryption machine 12 from the facsimile input device 16. The encryption machine 12 encrypts the sea state drawing data according to a separately input encryption key. The encrypted data is sent to the user terminal 7 via the transmitter 13 and the antenna 14. DES (D
ata Encryption Standard) Other methods are used. At the user terminal 7, the oceanographic chart data sent from the ground station is received by the antenna 16 and the receiver 17 and input to the decoder 18.
The decryption device 18 decrypts the input encrypted data by using the separately input key 19 by the process corresponding to the encryption method of the encryption device 12. The decoded data is displayed on the image display 21 or output to the hard copy 22 by the output device 20 as a sea state drawing for use. Here, the key 15 for encryption at the ground station and the key for decryption at the user terminal
It is assumed that 19 are the same and have been sent to the user terminal in advance by any secure transmission means 23.

The above is the basic configuration of the remote sensing data distribution system according to the present invention, which can prevent unauthorized interception and use of data by a third party. In the above embodiment, the case where the same data is distributed to all the user terminals 7 is considered, but for wide area remote sensing data, it may be desired to distribute only different partial areas of the observation range for each user. . The modifications of the embodiment in that case are as follows. The sea state drawing created by the processing device 9 is divided into partial areas. Ground station encryption machine 12
The area code 24, which is the identifier of the partial area, and the key 15 corresponding to the area code are input to. That is, the key is different for each district code. The encryption machine 12 encrypts the sea chart data according to the key 15, and the result has the format shown in FIG. That is, the unencrypted district code 28 is added to the head of the encrypted data 29. This type of data is sent to the user terminal. FIG. 3 is a block diagram of the decoder 18 of the user terminal. The district code 25 and the corresponding encryption key 19 for which the data of each user is desired to be used are entered in the memory 32 in advance. One or more district codes in memory
33 and key 34 are stored. It is assumed that the received data input from the receiver 17 has the format shown in FIG. 2, and the decision circuit 30 makes a collation decision of the district code 28 of the received data. The district code 28 is collated with the district code 33 in the memory 32, and if any one of them matches, it is the data to be received and used, so the key 34 corresponding to the district code 33 is read from the memory 32 and sent to the decryption circuit 31. , Decrypts the encrypted data 29. The decoding result is sent to the output device 20. District code 28 of received data
If does not match any of the district codes 33 in the memory, the received data is read and discarded. By this method, data of different districts can be concealed and sent for each user.

As described above, in the present embodiment, it is possible to prevent the unauthorized use of the data other than the contractor. In particular, according to the method in which the key is changed for each district and divided and distributed, it is possible to finely charge according to use. Although the antenna and the processor are directly connected to each other as the ground station in this embodiment, they may be installed at a remote place to transmit data or be stored in a storage medium for transportation. Further, it goes without saying that it can be used for remote sensing applications other than fishery remote sensing, and the data distribution means can be used for transporting a storage medium other than wireless.

〔The invention's effect〕

According to the present invention, since the content of the distribution data of the remote sensing data can be kept secret by encryption, there is an effect that the value of the data can be protected and the abuse can be prevented.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a remote sensing data distribution system according to the present invention, FIG. 2 is a configuration diagram of distribution data,
FIG. 3 is a block diagram of the decoder. 1 …… observation satellite, 6 …… ground station, 7 …… user terminal, 9 …… processor, 12 …… encryptor, 18 …… decoder, 28 …… district code,
29 …… Cryptographic data.

Claims (1)

[Claims] 1. A ground station comprising an observation satellite, an observation data reception device, a reception data processing device, and a processing result data transmission device sent from the satellite, and a data reception device and reception data sent from the ground station. One or more user terminals consisting of
A remote processing data distribution system, wherein the ground station is provided with a transmission data encryption device, and the user terminal is provided with a reception data decryption device, wherein the transmission device transmits the processing result data to an observation target area. The encrypted data is divided by each area, and encrypted data encrypted with different keys for each area is sent together with the area identification code. The user terminal uses the area identification code of one or more observation areas that the user of the user terminal wants to use. And a memory for storing an encryption key corresponding to each area identification code, a determination means for determining whether or not the area identification code transmitted from the transmitter is included in the area identification code stored in the memory, Decryption means for decrypting the encrypted data of the area identification code determined to be included in the memory by the determination means with the key stored in the memory Distribution system of the remote sensing data, wherein.