WO2013027881A1

WO2013027881A1 - Method and device for security of correction information of a dgnss reference station

Info

Publication number: WO2013027881A1
Application number: PCT/KR2011/006961
Authority: WO
Inventors: 조득재; 박상현
Original assignee: 한국해양연구원
Priority date: 2011-08-22
Filing date: 2011-09-21
Publication date: 2013-02-28

Abstract

The present invention relates to a method and device for security of correction information of a differential GNSS (DGNSS) base station, and has the objective of responding to a hostile user using a service of the DGNSS base station that uses public frequencies, signal systems, and data formats. To this end, according to the present invention, a correction information service, which is a major function of the DGNSS base station, is encrypted to stably provide a service to civilian and military users under normal circumstances but to allow access only to military or special-purpose users in emergency situations, thereby preventing hostile usage.

Description

Security method and security device of DGNSS reference station correction information

The present invention encrypts the correction information service, which is the main mission of the DGNSS reference station, to cope with the use of the services of hostile users of the DGNSS (Differential GNSS) reference station using the disclosed frequency, signaling system and data format. The present invention relates to a device and a method for providing stable services to military users and preventing hostile use by allowing access only to military and special purpose users in case of emergency.

The Ministry of Land, Transport and Maritime Affairs operates DGNSS reference stations for maritime and inland voyages for safe operation of port entry / exit routes and narrow channel navigational vessels. This DGNSS service is a system to improve the location accuracy of private GNSS users to 1m level using frequency, signal system and data format designed according to international organization standards. The DGNSS reference station uses the RTCM SC-104 calibration data standard for calibration information service, and uses the radio beacon frequency of 283.5 ~ 325kHz and MSK modulation. However, there is a risk of exposing the coordinates and logistics movements of various facilities throughout the country in the event of a national crisis, so it is necessary to encrypt the current DGNSS reference station system and receivers of special ships and convert them into exhibition operation systems. Therefore, there is a need for an apparatus and method that can provide stable services to military users as well as private users and prevent hostile use by allowing access only to military and special purpose users in case of emergency.

It is an object of the present invention to encrypt the correction information service, which is the main mission of the DGNSS reference station, in order to cope with the use of the services of the hostile user of the DGNSS (Differential GNSS) reference station using the disclosed frequency, signaling system and data format. In addition, to provide a stable service to military users, and to provide access to military and special purpose users in case of emergency in order to provide a security method and security device of the DGNSS reference station correction information that can prevent hostile use.

An object of the present invention as described above, the step of applying the encryption key to the error correction data of the satellite navigation system to generate encrypted error correction data and then transmitting the encrypted error correction data to the user terminal (S100) It is achieved by the security method of the DGNSS reference station correction information, characterized in that made.

The security method of the DGNSS reference station correction information may further include receiving the encrypted error correction data (S200), and decoding the encrypted error correction data to generate normal error correction data (S300). It is characterized by.

In addition, the decryption of the error correction data encrypted in the step (S300), generating the same decryption key as the encryption key (S310), and removes the decryption key from the encrypted error correction data to correct the normal error correction data It characterized in that the production by the step (S320).

In addition, the error correction data of the satellite navigation correction system of the step (S100), the encryption key, and the generation time of the decryption key of (S310) is characterized in that the synchronization.

In addition, the encryption key and decryption key is characterized in that it is updated periodically.

On the other hand, the object of the present invention as described above, DGNSS standard, characterized in that it includes a security device for generating and transmitting encrypted error correction data by applying an encryption key to the error correction data of the satellite navigation correction system; It is also achieved by a security device for station correction information.

The security device for the DGNSS reference station correction information may further include a decoder for receiving and decrypting the encrypted error correction data to generate normal error correction data.

The decryptor may generate a decryption key that is the same as the encryption key of the security unit, and generate normal error correction data by removing the decryption key from the encrypted error correction data.

In addition, the generation time of the error correction data of the satellite navigation correction system, the encryption key of the security device and the decryption key of the decryptor is characterized in that the synchronization.

According to the present invention, it provides a stable service to civilian and military users in everyday times, disseminates redundant receivers (authorized user equipment) to specific ships (military, tolerant, munitions transport) in case of emergency, and also the reference station as an exhibition operation system. It is possible to support the exhibition by reducing the positioning precision in the national territory by disabling public use by converting.

In addition, if the positioning accuracy is low, the coordinates of domestic facilities are not exposed, thereby minimizing damage.

In addition, it can be used as a material transportation and operation support system in case of emergency.

1 to 3 are flowcharts illustrating a security method of DGNSS reference station correction information according to the present invention;

4 and 5 are block diagrams for explaining the security device of the DGNSS reference station correction information according to the present invention.

10: DGNSS reference station GNSS receiver 30: security device

40: decryptor 50: user terminal

51: GNSS receiver

The present invention encrypts the correction information service, which is the main mission of the DGNSS reference station, to cope with the use of the services of hostile users of the DGNSS (Differential GNSS) reference station using the disclosed frequency, signaling system and data format. The present invention relates to a security method and a security device of DGNSS reference station correction information that can provide stable service to military users and prevent hostile use by allowing access only to military and special purpose users in case of emergency.

The security method of the DGNSS reference station correction information,

As shown in FIG. 1, a data encryption key is applied to DGNSS Error Correction Data of a Differential Global Navigation Satellite System (DGNSS) to generate encrypted error correction data, and then a user terminal ( 50) and transmitting the encrypted error correction data (S100).

The step (S100) is not usually made, but only when a situation that corresponds to the exhibition occurs. That is, all the user terminals 50 that normally receive only error correction data are transmitted and receive them, but normally, the user terminal 50 that receives them when the step (S100) is performed in a situation that is in accordance with the exhibition has two forms. Separated by. The first is a user terminal having a function of decrypting the encryption key, and the second is a user terminal which cannot decrypt the encryption key.

Therefore, if it is not equipped with a function to decrypt the encryption key, it will be distorted or cause a malfunction, and if it is equipped with the function to decrypt the encryption key operates normally as usual, it is preferable to further include the following steps.

The security method of the DGNSS reference station correction information may further include receiving the encrypted error correction data (S200), and decoding the encrypted error correction data to generate normal error correction data (S300). .

In addition, the decryption of the error correction data encrypted in the step (S300), generating the same decryption key as the encryption key (S310), and removes the decryption key from the encrypted error correction data to correct the normal error correction data It is made by the step (S320) to generate.

In addition, the generation time of the error correction data of the satellite navigation correction system of the step (S100), the encryption key, and the decryption key of the step (S310) is synchronized, the synchronized generation time is used as a reference during decryption.

To generate the decryption key (same as the encryption key) and to use it to generate the normal error correction data by decrypting the encryption key in step (S300), the device to decrypt is lost This is to make it difficult to know the process of generating the normal error correction data even when the enemy is in the water.

In addition, periodically renewing the encryption key and decryption key further enhances security.

On the other hand, as another category of the present invention, the DGNSS reference station correction information security device,

It includes a security device 30 to generate the encrypted error correction data by transmitting the encryption key to the error correction data of the satellite navigation correction system 30.

The security device for the DGNSS reference station correction information further includes a decoder 40 for receiving and decrypting the encrypted error correction data to generate normal error correction data.

In addition, the decryptor 40 generates the same decryption key as the encryption key of the security unit 30, and removes the decryption key from the encrypted error correction data to generate normal error correction data.

In addition, the generation time of the error correction data of the satellite navigation correction system, the encryption key of the security device 30 and the decryption key of the decryptor 40 are synchronized.

In addition, the encryption key and decryption key are periodically updated.

Such a security device of the DGNSS reference station correction information is similar to the features of the security method, and specific functions are replaced with the above descriptions. Hereinafter, the detailed operation relationship will be described with reference to FIGS. 4 and 5.

The GNSS receiver 10 of the DGNSS reference station of the satellite navigation correction system may receive the GNSS RF signal and the reference station antenna position data to generate error correction data.

The security device 30 includes an encryption device 31 for applying encryption to the error correction data and encrypting the data, and a modulator 32 for converting the encrypted error correction data generated by the encryption device 31 into a wireless transmission signal. It is configured to include, and transmits the encrypted error correction data.

The decryptor 40 includes a demodulator 41 for converting the wireless transmission signal into original encrypted error correction data, and a decryption device 42 for decrypting the encrypted error correction data. Convert to normal error correction data.

Here, the decryption device 42 generates a decryption key that is identical to the encryption key of the encryption device 31 and whose generation time is also synchronized to generate normal error correction data using a decryption key corresponding to the encryption key of the encrypted error correction data. do.

The user terminal 50 receives the normal error correction data and the GNSS RF signal decoded by the decoder 40, and uses the position information indicated by correcting the GNSS RF signal using the normal error correction data.

DGNSS: Differential Global Navigation Satellite System

RTCM: Radio Technical Commission for Maritime Services

SC-104: Special Committee-104

RF: Radio Frequency

-DGNSS Error Correction Data: Error correction data of satellite navigation correction system

-PRC: Pseudorange Correction

-RRC: Range-rate Correction

Navigation Data: Navigation or Positioning Results

Data Encryption Key: Data Encryption Key

Data Encryption Formatter

Modulator

Radio Beacon Transmitter

Demodulator: Demodulator

Although the present invention has been described in connection with the preferred embodiment, those skilled in the art will be able to easily make various changes and modifications without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation, and the true scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent scope are included in the present invention. Should be interpreted as.

Claims

Generating encrypted error correction data by applying an encryption key to the error correction data of the satellite navigation correction system and transmitting the encrypted error correction data to a user terminal (S100);

DGNSS reference station correction information security method characterized in that it comprises a.
The method of claim 1,

Receiving the encrypted error correction data (S200);

Decrypting the encrypted error correction data to generate normal error correction data (S300);

Security method of the DGNSS reference station correction information, characterized in that it further comprises.
The method of claim 2,

Decryption of the error correction data encrypted in the step (S300),

Generating a decryption key identical to the encryption key (S310);

Generating normal error correction data by removing the decryption key from the encrypted error correction data (S320);

DGNSS reference station correction information security method, characterized in that made by.
The method of claim 3,

And the generation time of the error correction data of the satellite navigation correction system of step (S100), the encryption key, and the decryption key of step (S310) are synchronized.
The method according to claim 3 or 4,

And the encryption key and decryption key are periodically updated.
A security device (30) for generating encrypted error correction data by transmitting an encryption key to the error correction data of the satellite navigation correction system and transmitting the encrypted error correction data;

Security device of the DGNSS reference station correction information, characterized in that it comprises a.
The method of claim 6,

A decoder 40 for receiving the encrypted error correction data, decrypting the same, and generating normal error correction data;

Security device of the DGNSS reference station correction information, characterized in that it further comprises.
The method of claim 7, wherein

The decryptor 40 generates the same decryption key as the encryption key of the security device 30, and removes the decryption key from the encrypted error correction data to generate normal error correction data. Information security device.
The method of claim 8,

And the generation time of the error correction data of the satellite navigation correction system, the encryption key of the security device (30) and the decryption key of the decryptor (40) are synchronized.
The method according to claim 8 or 9,

And the encryption key and decryption key are periodically updated.