On the Security of LEO Satellite Communication Systems: Vulnerabilities, Countermeasures, and Future Trends

<div>In view of the development status of the security of LEO satellite communication system, a comprehensive review, induction, and summary is carried out.<br></div>

On the Security of LEO Satellite Communication Systems: Vulnerabilities, Countermeasures, and Future Trends

<div>In view of the development status of the security of LEO satellite communication system, a comprehensive review, induction, and summary is carried out.<br></div>

Effectiveness Evaluation Method of Constellation Satellite Communication System with Acceptable Consistency and Consensus Under Probability Hesitant Intuitionistic Fuzzy Preference Relationship

System effectiveness evaluation is an important part of constellation satellite communication system research, with applications in project verification and optimization as well as tactical and technical measurement argumentation. This paper presents a systematic and comprehensive effectiveness evaluation method for a constellation satellite communication system under a probabilistic hesitant intuitionistic fuzzy preference relationship (PHIFPR), aiming to better address the fuzziness and uncertainty in effectiveness evaluation. First, a proposed definition of PHIFPR describes the hesitancy of evaluators, provides hesitancy distribution information, and depicts the worst negative information and risk preferences in effectiveness evaluation. Then, we deduce the approximate consistency index of PHIFPR and establish a mathematical programming model to increase individual consistency when the approximate consistency index does not reach a predetermined level. In the sequel, a proposed group consensus index uses the PHIFPR-based Hausdorff distance to measure the closeness between evaluators' judgements. Afterwards, a consistency and consensus improvement model is designed to retain the original opinions of evaluators to make the consistency and consensus of PHIFPRs acceptable. Moreover, a goal programming model is established to gain the reliable scheme priority weights by regarding the approximate consistency condition of a PHIFPR as a fuzzy constraint. Finally, an experimental example is offered to highlight the practicability and feasibility of the proposed method, and some comparative analyses with other methods offer insights into the designed method.

SOFTWARE AND HARDWARE FOR MODELING A BROADBAND SATELLITE COMMUNICATION SYSTEM

The paper presents the results of the development of a software and hardware complex for simulating a satellite communication channel. Shown is a block diagram, composition and results of experimental studies.

One Early Warning and Traffic Control Method for Satellite Communication System and the Implement of Time Prediction Algorithm

This article introduces an early warning and control method of user satellite communication traffic applied to satellite communication system. Due to the high communication cost of transportation satellites, in order to avoid high communication bills, the full-service ability to collect call data records (CDR) by Transportation Satellite Business Support System is required to provide early warning and business control over the four dimensions of voice, data, text messages, and package fees for satellite communications. At the same time, the system predicts the typical user behavior through the time series prediction Prophet algorithm, which serves as the default reminder rule to achieve full coverage of users.