WO2013027882A1

WO2013027882A1 - Method and device for security of correction information of a dgnss reference station using encrypted intentional error information

Info

Publication number: WO2013027882A1
Application number: PCT/KR2011/006964
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) reference station for preventing a hostile user from using a service of the DGNSS reference station that uses public frequencies, signal systems, and data formats. To this end, according to the present invention, a correction information service that is a major function of the DGNSS reference station is encrypted to stably provide a service to civilian and military users under normal circumstances but to allow access only to military users or special-purpose users in an emergency situation, thereby preventing hostile usage.

Description

Security method and security device of DGNSS reference station correction information using encrypted intentional error 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, to provide security method and security device of DGNSS reference station correction information using encrypted intentional error information that can prevent hostile use. There is.

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

The security method of the DGNSS reference station correction information includes: receiving the distorted error correction data (S200); The method may further include generating normal error correction data by removing the intentional error data from the distorted error correction data (S300).

In addition, intentional error data removal in step S300 may include generating decoding error data identical to the intentional error data (S310); And generating the normal error correction data by removing the decoding error data from the distorted error correction data (S320).

In addition, the intentional error data of the step (S100) and the decryption error data of the step (S310) is a step of encrypting by applying an encryption key (S110, S311); characterized in that it further comprises.

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

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

On the other hand, the object of the present invention is another category, the encrypted intentional error information comprising a; security device for transmitting the error correction data by applying the error data to the error correction data of the satellite navigation correction system; It is also achieved by the security device of the DGNSS reference station correction information.

The DGNSS reference station correction information security device may include: a dedicated receiver configured to receive the distorted error correction data; And a decoder for generating normal error correction data by removing intentional error data from the distorted error correction data.

The decryptor may generate decryption error data identical to intentional error data of the security device, and generate normal error correction data by removing the decryption error data from the distorted error correction data.

In addition, the intentional error data of the security device and the decryption error data of the decryptor is characterized in that the encryption key is given and encrypted.

In addition, the generation time of the error correction data of the satellite navigation correction system, the intentional error data of the security device, the decryption error data of the decoder 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 5 are a flow chart illustrating a security method of DGNSS reference station correction information using encrypted intentional error information according to the present invention;

6 and 7 are block diagrams illustrating a security device of DGNSS reference station correction information using encrypted intentional error information according to the present invention.

10: DGNSS reference station GNSS receiver 30: security device

31: error acceptance module 32, 43: encrypted error generation module

40: Decryptor 41: Dedicated Receiver

42: error elimination module 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 for DGNSS reference station correction information using encrypted intentional error information that can provide stable service to military users and allow only access to military and special-purpose users in case of emergency.

Security method of the DGNSS reference station correction information using the encrypted intentional error information,

As shown in FIG. 1, intentional error data is applied to DGNSS Error Correction Data (DGNSS) of the Differential Global Navigation Satellite System (DGNSS) to generate distorted error correction data, and then And transmitting the error correction data (S100).

Intentional error data in the step (S100) is useful when decoding in synchronization with the generation time of the error correction data.

In addition, the step (S100) is not usually made, but is made only when a situation occurs in accordance with the exhibition. 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 removing the intentional error data, and the second is a user terminal having no function of removing the intentional error data.

Therefore, the function of removing the intentional error data is normally operated as usual, but the user terminal without the function of removing the intentional error data is weighted and the position of the user terminal is severely distorted. It is preferable to further include.

The security method of the DGNSS reference station correction information using the encrypted intentional error information may include receiving the distorted error correction data as shown in FIG. 2 (S200); The method may further include generating normal error correction data by removing intentional error data from the distorted error correction data (S300).

In addition, intentional error data removal in step S300 may include generating decoding error data identical to the intentional error data as shown in FIG. 3; And generating the normal error correction data by removing the readout error data from the distorted error correction data (S320).

The generation time of the error correction data, the intentional error data and the decoding error data of the step S310 of the satellite navigation correction system of step (S100) are synchronized, and this synchronized generation time is used as a reference at the time of decoding. .

In addition, if the intentional error data of the step (S100) and the decryption error data of the step (S310) is performed by applying encryption keys (S110, S311) as shown in FIGS. 4 and 5, only specific users are used. This is possible so security is enhanced.

Then, in operation S300, the intentional error data may be decrypted to generate normal error correction data, and separate encrypted decryption error data (same as the intentional error data) may be generated, and normal error correction data may be generated using the same. The reason for this is that the process of generating the normal error correction data cannot be easily understood even if the decoding device is lost and enters the enemy's hand.

In addition, if the encryption key is periodically updated, security is further enhanced.

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

And a security device 30 transmitting intentional error data to the error correction data of the satellite navigation correction system and transmitting the distorted error correction data.

The security device of the DGNSS reference station correction information using the encrypted intentional error information includes: a dedicated receiver (41) for receiving the distorted error correction data; And a decoder 40 for generating normal error correction data by removing intentional error data from the distorted error correction data.

In addition, the decryptor 40 generates decryption error data identical to the intentional error data of the security device 30 and removes the decryption error data from the distorted error correction data to generate normal error correction data. It is done.

In addition, the intentional error data of the security device 30 and the decryption error data of the decryptor are encrypted with an encryption key.

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

The security device of the DGNSS reference station correction information using such intentional error information differs only in categories, and is substantially the same as the security method, so that the specific functions are replaced with the above descriptions, and the detailed operation relations with reference to FIGS. 6 and 7. To explain,

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.

On the other hand, the security device 30 is composed of an error applying module 31 and the encrypted error generating module 32, the encrypted error generating module 32 is intentional error data generated in synchronization with the generation time of the error correction data And encrypting the encryption key.

The error application module 31 inserts the intentional error data into the error correction data and transmits the error data to the user terminal 50.

Before the user terminal 50 receives the error correction data including the intentional error data, the intentional error data included in the error correction data is removed through the dedicated receiver 41 and the decoder 40.

Specifically, the dedicated receiver 41 receives error correction data including intentional error data.

The decryptor 40 is composed of an error removal module 42 and an encrypted error generation module 43. The darkened error generation module 42 is generated in synchronization with the generation time of the error correction data as in the security device 30. Encrypted decryption error data and encryption key are collected and encrypted.

The error removing module 42 removes the decoding error data from the error correction data including the intentional error data by using the decoding error data, that is, removes the intentional error data.

The user terminal 50 receives the normal error correction data and the GNSS RF signal from which the intentional error data has been removed from 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

-Modified Z-Count: Error correction data generation time tag

-PRC: Pseudorange Correction

-RRC: Range-rate Correction

Navigation Data: Navigation or Positioning Results

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

Transmitting intentionally error data to error correction data of the satellite navigation correction system to generate distorted error correction data, and then transmitting the distorted error correction data to a user terminal (S100);

Security method of the DGNSS reference station correction information using the encrypted intentional error information, characterized in that comprises a.
The method of claim 1,

Receiving the distorted error correction data (S200);

Generating normal error correction data by removing intentional error data from the distorted error correction data (S300);

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

Intentionally removing the error data in the step (S300),

Generating the same decoding error data as the intentional error data (S310);

Generating normal error correction data by removing the readout error data from the distorted error correction data (S320);

Security method of the DGNSS reference station correction information using the encrypted intentional error information, characterized in that made by.
The method of claim 3,

Encrypting the intentional error data of step S100 and the decryption error data of step S310 by applying an encryption key (S110 and S311);

Security method of the DGNSS reference station correction information using the encrypted intentional error information, characterized in that it further comprises.
The method of claim 3,

The generation time of the error correction data, the intentional error data of the satellite navigation correction system of step (S100) and the decryption error data of the step (S310) is synchronized DGNSS reference station using encrypted intentional error information Security method of correction information.
The method of claim 4, wherein

And encrypting the encryption key periodically. The method of claim 1, wherein the encryption key is periodically updated.
A security device (30) for applying intentional error data to the error correction data of the satellite navigation correction system to transmit the distorted error correction data;

Security device of the DGNSS reference station correction information using the encrypted intentional error information, characterized in that it comprises a.
The method of claim 7, wherein

A dedicated receiver 41 for receiving the distorted error correction data;

A decoder 40 for generating normal error correction data by removing intentional error data from the distorted error correction data;

Security device of the DGNSS reference station correction information using the encrypted intentional error information, characterized in that it further comprises.
The method of claim 8,

The decryptor 40 generates decryption error data that is identical to the intentional error data of the security device 30, and generates normal error correction data by removing the decryption error data from the distorted error correction data. Security device of DGNSS reference station correction information using encrypted intentional error information.
The method of claim 9,

The intentional error data of the security device (30) and the decryption error data of the decryptor (40) is secured to the DGNSS reference station correction information using the encrypted intentional error information, characterized in that the encryption key is given.
The method of claim 9,

The generation time of the error correction data of the satellite navigation correction system, the intentional error data of the security device 30, the decryption error data of the decryptor 40 is synchronized, DGNSS reference station correction using encrypted intentional error information Information security device.
The method of claim 10,

And the encryption key is periodically updated to secure the DGNSS reference station correction information using encrypted intentional error information.