Satellite measurement and control link communication key on-orbit updating and management method

Abstract

The invention discloses a satellite measurement and control link communication secret key on-orbit updating and management method. The method is characterized by comprising the following steps: step 1, a ground station sends a measurement and control link intermediate secret key updating data packet through a remote control link; step 2, the measurement and control communication machine identifies and analyzes an intermediate key update data packet sent by the ground station by analyzing remote control link data; after the measurement and control communication machine correctly analyzes the intermediate key update data packet, the intermediate key and the key number are extracted; step 3, the satellite service computer feeds back a result of analyzing the secret key updating data packet by the measurement and control responder to the ground station through a downlink telemetering link; and step 4, the ground station receives the feedback telemetry information. According to the method, on the premise of ensuring the reliability of the satellite measurement and control link, the security of the satellite measurement and control link can be improved by performing on-orbit updating and management on the communication secret key of the satellite measurement and control link.

Description

technical field [0001] The invention relates to satellite measurement and control technology, in particular to a method for on-orbit update and management of a satellite measurement and control link communication key. Background technique [0002] The measurement and control link of the satellite is divided into an uplink remote control link and a downlink telemetry link. The uplink remote control link is used for the monitoring and control station to control and manage the satellite. It is the only communication link for the ground to control the satellite when the satellite is in orbit. The telemetry link feeds back the status information of the in-orbit satellite to the ground station. Therefore, , the measurement and control link is a very important communication link for satellites, and the reliability and safety of the link must be ensured in the actual application process. [0003] However, in the actual application process, there is a certain contradiction between r...

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Problems solved by technology

[0004] First, use the mechanism of non-coherent spread spectrum, scrambling or special frame structure to provide relatively simple security guarantee for communication, but the security protection provided by these measures is very limited, and it is very easy to be cracked;

[0005] Second, satellites preset secret keys directly on the ground during design, and use the same secret key for communication when the satellite is in orbit. This method will rapidly reduce communication security over time.

[0006] It can be seen that satellites have high requirements on the reliability and security of the TT&C link, but in the actual application process, there is a certain contradiction between reliability and security, and an overly complicated security mechanism can easily lead to link failure. Reduced reliability

Therefore, in the remote control link, more emphasis is placed on reliability, and security generally uses mechanisms such as non-coherent spread spectrum, scrambling, or special frame structures to provide relatively simple security guarantees for communication, but the security protection that these measures can provide Very limited, very easy to be cracked; or when the satellite is designed with a preset secret key on the ground, and the satellite uses encryption technology to encrypt the communication link when the satellite is in orbit, but the secret key will not be updated or secreted in orbit. Key switching, this method will rapidly decrease the communication security as time goes by

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