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A Survey on Satellite Communication System Security [PDF]

open access: yesSensors
In recent years, satellite communication systems (SCSs) have rapidly developed in terms of their role and capabilities, promoted by advancements in space launch technologies.
Minjae Kang, Sungbin Park, Yeonjoon Lee
doaj   +4 more sources

MBSE for Satellite Communication System Architecting

open access: yesIEEE Access, 2019
The risk of failure for aerospace missions can be reduced if architects model the product in a systematic way and make decisions for physical implementation based on stakeholder needs.
Su Gao, Wei Cao, Luhai Fan, Jihong Liu
doaj   +3 more sources

Modeling and Throughput Optimization of Multi-Gateway LoRaWAN

open access: yesIEEE Access, 2023
Low power wide area network (LPWAN) technologies have become an integral part of Internet-of-Things (IoT) applications due to their ability to meet key requirements such as long range, low cost, massive device numbers, and low energy consumption.
Baoguo Yu   +4 more
doaj   +1 more source

A Novel Weighted KNN Algorithm Based on RSS Similarity and Position Distance for Wi-Fi Fingerprint Positioning

open access: yesIEEE Access, 2020
In Wi-Fi fingerprint positioning, what we should most care about is the distance relationship between the user and the reference points (RP). However, most of the existing weighted k-nearest neighbor (WKNN) algorithms use the Euclidean distance of ...
Boyuan Wang   +6 more
doaj   +1 more source

Analysis of Quasi-Zenith Satellite System Signal Acquisition and Multiplexing Characteristics in China Area

open access: yesSensors, 2020
On the basis of realizing regional navigation, the Quasi-Zenith Satellite System (QZSS) has advanced navigation function, which leads to the broadcasting of more signals in a single frequency of QZSS signals. Current signal transmission technology cannot
Hongjun Ye   +6 more
doaj   +1 more source

Tracking systems for satellite communications

open access: yesIEE Proceedings F Communications, Radar and Signal Processing, 1988
During the past twenty years or so a considerable amount of work has gone into the development of tracking schemes for satellite communication systems. Here a review of the various techniques is presented. For each method used the principle of operation is described and the various salient features extracted.
Hawkins, GJ, Edwards, DJ, McGeehan, JP
openaire   +3 more sources

Pedestrian Dead Reckoning Based on Motion Mode Recognition Using a Smartphone

open access: yesSensors, 2018
This paper presents a pedestrian dead reckoning (PDR) approach based on motion mode recognition using a smartphone. The motion mode consists of pedestrian movement state and phone pose.
Boyuan Wang   +4 more
doaj   +1 more source

An Improved WiFi Positioning Method Based on Fingerprint Clustering and Signal Weighted Euclidean Distance

open access: yesSensors, 2019
WiFi fingerprint positioning has been widely used in the indoor positioning field. The weighed K-nearest neighbor (WKNN) algorithm is one of the most widely used deterministic algorithms.
Boyuan Wang   +4 more
doaj   +1 more source

Advanced Communications Satellite Systems [PDF]

open access: yesIEEE Journal on Selected Areas in Communications, 1983
Demand for in-orbit capacity through the use of satellite systems will continue throughout the next two decades. The potential of the 30/20 GHz frequency band for fixed satellite services will be exploited. However, many technology questions must be answered if the band is to be used commercially because of the high rain fades that can occur at these ...
openaire   +1 more source

Comparison of Satellite Repeat Shift Time for GPS, BDS, and Galileo Navigation Systems by Three Methods

open access: yesAlgorithms, 2019
The characteristic of the satellite repeat shift time can reflect the status of the satellite operation, and is also one of the key factors of the sidereal filtering multipath correction.
Yanxi Yang, Jinguang Jiang, Mingkun Su
doaj   +1 more source

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