STUDIES OF EMERGENCY COMMUNICATION APPLICATION OF INTEGRATED COMMUNICATION NETWORK AND COMPARISON OF AVAILABILITY IMPROVEMENT METHODS

综合通信网应急通信应用研究及可用性改进方法比较

• 批准号: 09650420
• 负责人: HATSUDA Takeshi
• 金额: $ 2.18万
• 依托单位: HOKKAIDO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650420/
• 关键词: Satellite communication; Propagation characteristics; Sat.D characteristics; Geostationary satellite; Urban propagation characteristics; GPS signals; Propagation characteristics measurements; パケット通信; サイトダイバーシティ方式; サテライトダイバーシティ方式; 災害対策通信; 衛生通信 /

For the aspects of a new minimum cost, high reliability system strategy for the Hokkaido Integrated Telecommunication (HIT) network, system designs and propagation experiments for site diversity and satellite diversity characteristics were examined.[1] HIT Network system design for emergency use.Three aspects of a new system strategy for the Hokkaido Integrated Telecommunication (HIT) network are examined, i.e., (1) network construction by using MS Windows 2000 Server, (2) A packet communication ultra small aperture terminal (PC-USAT) system, which contains a method for overcoming the satellite links rain attenuation discontinuities, (3) An optimum rain margin technique and the 14/12 GHz band rain, snow attenuation and satellite diversity (Sat.D) experiments.[2] Sat.D experiments using plural satellitesThe possibilities of the satellite diversity (Sat.D) system for VSAT earth station in snowing climates are examined by using plural satellites. Six satellite down-link signals are measur … More ed in experiments, i.e., JCSAT-1, JCSAT-3 and Broadcasting Satellite (BS) etc. and diversity gains are obtained by the Sat.D simulation program. From the obtained Sat.D results for snowing attenuation in snowing climates, it becomes clear that the Sat.D would be utilized effectively for the VSAT system, rather than conventional site diversity (SD) system.[3] Site diversity experiments using JCSAT transponderAs for the system design of the HIT network, it must first overcome rain attenuation discontinuity of satellite links. To resolve some of these problems, site diversity (SD) is another candidate. To clarify the SD characteristics for introduction possibility, SD experiments were continued for medium distance earth stations[4] Propagation characteristics and satellite-diversity (Sat.D) characteristics of mobile broadcast geostationary satellite systemThis study deals with the urban propagation characteristics and satellite-diversity (Sat.D) characteristics of mobile broadcast geostationary satellite system by using the GPS (Global Positioning System) signals. For designing digital broadcast from geostationary satellite, it must be clarified the shadowing characteristics by urban building, electrical light poles and trees etc. Southern orbital arc GPS satellite signals with elevation angle between 40〜50 degrees data are used for propagation characteristics, rather than actual geostationary satellite, e.g., the N-STAR.This new measuring method has several merits, i.e., low measuring equipment cost, easy data accumulation (i.e., satellite position, receiver position ard height, received signal levels etc.). A receiving system on a vehicle measured signals fades caused by shadowing building etc. As a result, west to east urban roads are heavily attenuated.Furthermore, to overcome this attenuation, the Sat.D characteristics are processed from measured data. From processing results, more than 90 % satellite visibility percentage can be achieved in urban city by selecting two diversity satellites with separation angles more than about 45 degrees. Less

针对北海道综合电信（HIT）网络最小成本、高可靠性的新系统策略，研究了站点分集和卫星分集特性的系统设计和传播实验应急使用HIT网络系统设计。本文从三个方面研究了北海道综合电信（HIT）网络的新系统策略，即：(1)利用MS Windows 2000 Server构建网络；(2)包通信超小孔径终端（PC-USAT）系统，该系统包含克服卫星链路雨衰减不连续的方法；(3)最佳雨裕度技术和14/12 GHz频段雨雪衰减和卫星分集（Sat.D）实验多卫星卫星分集试验研究了多卫星卫星分集（Sat.D）系统在降雪气候条件下应用于VSAT地面站的可能性。实验中对JCSAT-1、JCSAT-3、广播卫星（BS）等6颗卫星下行信号进行了测量，并通过Sat.D仿真程序获得了分集增益。从获得的在降雪气候下的降雪衰减的Sat.D结果可以清楚地看出，Sat.D将被有效地用于VSAT系统，而不是传统的站点分集（SD）系统在系统设计中，首先要克服卫星链路的雨衰减不连续问题。为了解决这些问题，站点多样性（SD）是另一个候选。为明确SD特性，为引入提供可能，本文对移动广播地球静止卫星系统的传播特性和卫星分集（Sat.D）特性进行了研究。本研究利用GPS（全球定位系统）信号对移动广播地球静止卫星系统的城市传播特性和卫星分集（Sat.D）特性进行了研究。在设计地球同步卫星数字广播时，必须明确城市建筑、电线杆、树木等遮挡的特点。南轨道弧GPS卫星信号的仰角在40 ~ 50度之间的数据用于传播特性，而不是实际的地球同步卫星，例如N-STAR。该测量方法具有测量设备成本低、数据积累方便（卫星位置、接收机位置和高度、接收信号电平等）等优点。车辆上的接收系统测量了由于建筑物等遮挡引起的信号衰减。因此，从西到东的城市道路严重衰减。此外，为了克服这种衰减，对实测数据进行了Sat.D特征处理。从处理结果来看，选择两颗分离角度大于45度的分集卫星，在城市区域内卫星能见度可达90%以上。少

项目成果

初田健,山田芳伸、村上幹幸、加藤忠義: "静止光ファイバーテザー衛星(F-GTS)と低軌道衛星を組合せた超高速ハイブリッド衛星網の設計"北海道工業大学研究紀要. 27号. 143-150 (1999)

Ken Hatsuda、Yoshinobu Yamada、Mikiyuki Murakami、Tadayoshi Kato：“结合地球静止光纤系链卫星（F-GTS）和低轨道卫星的超高速混合卫星网络的设计”北海道工业学院研究通报第 27 期，第 143 期。 -150 (1999)

T.Hatsuda,Y.Yamada,M.Murakami and T.Katoh: "Availability Improvement of F-GTS Hybrid Satellite network by Introducing Satellite-Diversity (Sat. D) /Site-Diversity (SD) Systems"Proc.18th AIAA Communications Satellite Systems Conference. Session 26-SVC-1. 3

T.Hatsuda、Y.Yamada、M.Murakami 和 T.Katoh：“通过引入卫星分集（Sat. D）/站点分集（SD）系统提高 F-GTS 混合卫星网络的可用性”Proc.18th AIAA Communications

初田健、山田芳伸,長田絢悟,小林強志、加藤忠義、青木由直: "移動体衛星通信用静止衛星信号の都市内遮蔽特性のGPS利用測定法"北海道工業大学研究紀要. 29号(印刷中). (2001)

Ken Hatsuda、Yoshinobu Yamada、Kengo Osada、Tsuyoshi Kobayashi、Tadayoshi Kato、Yunao Aoki：“基于 GPS 的移动卫星通信对地静止卫星信号的城市屏蔽特性测量方法”北海道工业大学研究通报第 29 号（印刷版）。 (2001)

T.Hatsuda and T.Katoh: "Ultra High Bit-rate Satellite Network with Combination of GSO and LEO Satellites"21st International Symposium on Space Technology and Science, Session h, 98-h-12. (1998)

T.Hatsuda 和 T.Katoh：“结合 GSO 和 LEO 卫星的超高比特率卫星网络”第 21 届国际空间技术与科学研讨会，h 会议，98-h-12。

T.Hatsuda,S.Yonedda,M.Murakami and T.Katoh: "Optimum Satallite Arrangement of F-GTS Hybrid Satellite Neetwork by Using Genetic Algorithm"Proc.19th AIAA Communications Satellite Systems Conference. N114(To be published). (2000)

T.Hatsuda、S.Yonedda、M.Murakami 和 T.Katoh：“利用遗传算法实现 F-GTS 混合卫星网络的最优卫星排列”Proc.19th AIAA 通信卫星系统会议。