Đảm bảo chất lượng dịch vụ vệ tinh của công ty viễn thông quốc tế

H VU YE TINH CUA DHKTQD L V T h S 14588 BO GIAO DUC VA DAO TAO TRUONG DAI HOC KINH TE QUOC DAN NGUYEN THI THANH HUYEN DAM BAO CHAT LUONG DICH VU VE TINH CUA CONG TY VltN THONG QUOC TE Chuven nganh: KINH TE VA QUAN LY THU ONG MAI Ma nganh: 8340410 LU AN VAN THAC SI QUAN LY KINH TE NGUOI HUONG DAN KHOA HOC: TS Dinh Le Hai Ha I )AI i HH ' k EQ.D IT UK AU1IN TIN 'VI! N Ha Noi, 2018 LO’I CAM DOAN Toi da doc va hieu ve cac hanh vi vi pham sir trung thuc hoc thuat Toi cam ket bang danh du ca nhan rang nghien cuu toi tu thuc hien va khong vi pham yeu cau ve su trung thuc hoc thuat Ha Noi, thang nam 2018 Hoc vien Nguyen Thi Thanh Huyen LOI CAM ON Toi xin gui ldi cam cm toi lanh dao, thay co, cac nha khoa hoc cua Truong Dai hoc Kinh te Quoc dan nhat la thay co cua Bo mon Kinh te va Kinh doanh Thuong mai, Vien Thuong mai va Kinh te quoc te da giup va tao dieu kien cho toi hoan luan van Toi xin cam on cac lanh dao va nhan vien cac phong ban cua Cong ty Vien thong Quoc te - noi toi thuc hien nghien cuu de tai nay, da tao dieu kien thuan lpi, ho trp va chia se qua trinh toi nghien cuu Toi xin gui ldi cam on sau sac toi TS.Dinh Le Hai Ha da tan tinh huong dan va giup toi qua trinh hoan luan van Toi dac biet gui ldi cam on toi gia dinh va ban be da luon dong hanh, dong vien khich le toi suot thdi gian qua Xin chan cam on! Hoc vien Nguyen Thi Thanh Huyen YEU CAU CUA HOI HONG DANH GIA LUAN VAN THAC SI • • • Ve: Nhung diem can sua chua bo sung truce nop luan van chinh thuc cho Vien Dao tao Sau dai hoc /tkU - • ' - ' p Lidi A [ Y'y.' 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loi chinh ta A nhieu) thac sy kinh te Ket qua nghien cuu co y nghia thuc tien Tac gia luan van xung r r dang nhan hoc vi thac sy Kinh te, chuyen nganh Kinh te va Quan ly thuong mai Ha Noi, 10 thang 12 nam 2018 Ngiroi nhan xet TRUING DAI HOC KINH TE QUOC DAN HOI DONG DANH GIA LUAN VAN THAC si CONG HOA XA HOI CHU NGHIA VIET NAM Doc lap — Tu — Hanh phuc //d Noi, ngdy 14 thang 12 nam 2018 BAN NHAN XET LUAN VAN THAC SI • • • Cao hoc vien: Nguyen Thi Thanh Huyen De tai luan van: “Dam bao chat luong dich vu vc tinh cua Cong ty Vien thong quoc tg” Chuyen nganh: Quan tri kinh doanh thuong mai Ma so: 34 01 21 Nguoi nhan xet: PGS.TS Ha Van Sir D/vi cong tac: Truong DH Thuong mai Chuc trach Hoi dong: Phan bicn Sau doc ky ban luan van cua cao hoc vien, toi co nhung nhan xet va danh gia nhu sau: / Ve str can thict va tinh khong trung lap cua de tai luan van: Nen kinh te thi truong va hoi nhap quoc te doi hoi cac doanh nghiep phai no luc canh tranh moi co the ton tai va phat trien Trong do, cai thien va nang cao chat luong san pham/dich vu cung cap thi truong la giai phap mau chot va quan nhat de nang cao kha nang canh tranh cho cac doanh nghiep d nuoc ta hien Trong boi canh do, chung toi cho rang viec lua chon de tai: “Dam bao chat luong dich vu ve tinh cua Cong ty Vien thong quoc te” lam de tai Luan van thac kinh te cua CHV Nguyen Thi Thanh Huyen neu thuc hien tot se co y nghia thuc tien va thoi su cap thiet De tai phu hop voi chuyen nganh dao tao la Kinh te va quan ly thuong mai va khong trung lap voi cac cong trinh khoa hoc da duoc cong bo ma toi duoc biet Nhung cong va dong gop chu ycu ve noi dung cua luan van Luan van duoc ket cau lam chuong theo loi truyen thong, cac noi dung nghien cuu dat duoc mot so cong, dong gop chu yeu sau day: Thu nhdt, da he thong hoa va phan nao lam ro duoc mot so ly luan ve dich vu ve tinh va noi dung dam bao chat luong dich vu ve tinh cua doanh nghiep vien thong Thu hai, da phan tich thuc trang dich vu va cac bien phap dam bao chat luong dich vu ve tinh tai Cong ty Vien thong quoc te, qua luan van da neu mot so ket luan ve nhung yeu to dam bao, nhung yeu to chua dam bao va nhung nguyen nhan cua van de Thu ba, luan van da dua mot so giai phap dam bao chat luong dich vu ve tinh cua Cong ty Vien thong quoc te thoi gian toi Phuong phap nghien cuu Ve co' ban luan van co phu'O’ng phap nghien cuu phu hop vdi de tai nghien cuu (Cac phuong phap dupe sir dung chuyeu luan van la Tong quan tai lieu, thong ke, so scinlT) Mot so van cle han che va trao doi them: - phan mo dau, can bo sung phan tong quan cac cong trinh nghien cuu cd lien quan de chi khoang khoa hoc va nhung gia tri khoa hoc dupe ke thira - Can tang cudng tinh logic va hudng muc tieu nghien cuu cua de tai luan van hon Trong do, chuong can lam ro ban chat cua dich vu ve tinh, chat luqng dich vu ve tinh va noi dung dam bao chat lupng dich vu ve tinh, cac dieu kien va chinh sach dam bao chat lupng dich vu ve tinh; Chuong phai di sau lam ro thuc trang dam bao chat lupng dich vu ve tinh theo cac noi dung va chinh sach, dieu kien de dam bao chat lupng cac dich vu tai Doanh nghiep Cac phan tich, danh gia can co minh chung va so sanh vdi cac doi thu canh tranh, cung nhu dat xu hudng phat trien, tien bo khoa hoc ky thuat khu vuc va tren the gidi - Ngoai ra, luan van can khac phuc viec de trung lap giua ten chuong va ten muc chuong (d chuong 2, 3), muc 3.2.2 khong the de trung vdi ten chuong 3, bo sung ghi chu trich dan tai lieu tham khao, khac phuc loi cau chu va ky thuat luan van Danh gia chung Mac du mot so han che, song danh gia chung, luan van da dap ung dupe nhung yeu cau co ban ve noi dung va hinh thuc cua mot luan van thac si kinh te theo qui dinh cua Bo Giao due va Dao tao, va cua Truong Dai hoc Kinh te quoc dan Neu bao ve cong luan van cua minh trudc Hoi dong danh gia luan van si, CHV Nguyen Thi Thanh Huyen xung dang dupe nhan hoc vi thac si kinh te ngVoi nhan xet Cau hoi: Sau tai co cau Tap doan VNPT (vua qua), dieu co tac dong nhu the nao toi cac nguon luc va chinh sach dam bao chat lupng dich vu cung ung thi trudng cua Cong ty Vien thong quoc te hien nay? phap can thiet de dam bao chat luong ve ky thuat - chuc nang cua cac dich vu ve tinh, tu khau thiet ke cau hinh ve tinh de lua chon ve tinh can mua, xay dung cac tram dieu khien mat dat, thiet ke cac tuyen cho cac dich vu cung cap cho cac doi tuong khach hang Cu the cac bien phap da thuc hien la: • Thiet ke cau hinh ve tinh De dam bao cho hoat dong cua ve tinh sau duoc phong cung nhu hoat dong cung cap dich vu ve tinh cho cac khach hang thi viec xac dinh yeu cau ky thuat va cau hinh ve tinh co tam quan dac biet Cac can bo ky thuat cua VNPT_I duoc giao nhiem vu da tham gia tien hanh thiet ke lap cau hinh ve tinh dua tren co so bao cao nghien cuu kha thi cac du an ve tinh VINASAT ve nhu cau su dung ve tinh VINASAT cua cac Bo, nganh; Cac phan tich thi truong va cong nghe ve tinh vien thong noi chung va ve tinh dia tinh noi rieng tren the gidi, khu vuc va dac biet la nhu cau thi truong noi dia cung nhu cac phuong an tai chinh, kinh doanh doi vdi cac ve tinh VINASAT; Ket qua lam viec cua VNPT vdi cac doi tac cung cap ve tinh va tham khao kinh nghiem cua cac nha khai thac ve tinh khu vuc; Ket qua nghien cuu nhu cau thi truong cua hang chuyen nghien cuu thi truong vien thong; Ket qua nghien cuu tinh kha thi va kha nang mo rong vung phu ve tinh tai cac vi tri quy dao xac dinh, xay dung ke hoach phoi hop tan so Telesat thuc hien Tu nghien cuu, bo phan chuc nang duoc giao nhiem vu thiet ke cau hinh ve tinh da xac chi tieu ky thuat co ban cua cac ve tinh VINASAT, bao gdm a) Cac yeu cau cua he thong te tinh: Xac dinh vi tri quy dao: He thong VINASAT-1 se hoat dong tai vi tri quy dao dia tinh 132 Dong; He thong VINASAT-2 se hoat dong tai vi tri quy dao dia tinh 131,8 +/- 0.1 Dong Do on dinh vi tri: dap coin yeu cau on dinli vi tri +/-0,05 so vdi kinh va vi Thoi gian cung cap dich vu tni thieu la 15 nam Hoat dong: Cac ve tinh VINASAT se co kha nang hoat dong moi dieu kien ke ca khoang thoi gian che khuat ldn nhat sudt thoi gian song cua he thdng Mdi truong khong gian: Thiet ke ve tinh dam bao cac yeu cau chat luong ve tinh hoat dong mdi truong buc xa thuc te tren quy dao sudt tuoi tho cua ve tinh Kha nang tuong thich voi ten lua phong Ldi dinh vi: Khung ve tinh cd loi dinh vi tai huu ich khong qua 0,09 Truong hop ldi dinh vi ldn hon gia tri tren thi phai cd cac dieu kien cu the di kern nhung khong qua gia tri 0.12 Do tin cay: Do tin cay cua ve tinh den cuoi thoi gian song ldn hon 0,80 (TBD) Xac xuat cong tuong ung vcri viec khai thac cong tat ca cac bo phat dap cua cac phan tai huu ich, dam bao dat duoc chat luong tuong ung cua chung b) Cac yeu cau tai hieu ich ve tinh Tai huu ich: Cac Ve tinh VINASAT chi bao gom tai huu ich tren bang C va Ku (VINASAT 1) va bang Ku (VINASAT 2) vori cac yeu cau chat luong nhu md ta tung phan tai huu ich tuong ung Phuong thuc duong truyen chinh: Cac phuong thuc duong truyen co the ap dung cho bat ky bo phat dap bang tan C va Ku (VINASAT 1) va Ku (VINASAT 2): - Truyen dan tuong tu dieu che theo tan sd (FM): Don song mang nhu tin hieu thoai Dieu che tan sd / Ghep kenh phan chia theo tan sd (FM/FDM), truyen hinh mau vcri nhieu kenh tieng di kern Da song mang su dung phuong thuc truy nhap mot kenh / mot song mang dieu tan(SCPC/FM) - Truyen dan sd: Don song mang toc cao nhu Ghep kenh phan chia theo thdi gian (TDM) nhieu pha PSK, MF-TDMA PSK; Da song mang nhu FDMA PSK, TDMA PSK, QPSK, 8-PSK; Da song mang su dung phuong thuc truy nhap mot kenh I mot song mang thoai va sd lieu (SCPC) va 16-QAM c) Yeu cau chat luemg tai huu ich Vung phu song: Ve tinh VINASAT se co vung phu song tren bang tan xac dinh Mot vung phu song co dinh (fixed beam) thu va phat lanh tho Viet Nam va cac nuoc lan can; va mot vung phu co the xoay duoc (steerable beam) se phu song tai mot so thi truong tiem nang nhu: Uc, hoac Indonexia, hoac Philipin, hoac An Do So vung phu song cu the se duoc xac dinh bdi nha san xuat ve tinh Bo phat dap: VINASAT la 20 bo phat dap, VINASAT la tir 24 den 30 bo phat dap Phan kenh tan so: Bo phat dap bang tan C va Ku co bang thong la 36MHz Tan so cho dudng len va dudng xuong se duoc xac dinh cu the bdi phan kenh tan so phoi hop tan so va bo tri cua nha san xuat ve tinh Phan cue: Phan tai huu ich se phat va thu bang phuong thuc phan cue tuyen tinh Phan cue cu the cua cac bo phat dap se duoc xac dinh Cong suat phat xa dang hudng tuong duong (EIRP): Muc EIRP doi vdi vung phu song se la 57 dBW He so pham chat (G/T): Muc G/T toi thieu doi vdi vung phu song se la 4.0 dB/K Mat thong luong bao hoa cua ve tinh (SFD): Moi bo phat dap hoan toan co the duoc dieu khien doc lap de hoat dong bang che tang he so khuech dai co dinh (FGM) hoac Dieu khien muc tu dong (ALC) Mach ALC co the ghep vdi bo suy hao mat dat co the dieu khien cho phep dieu chinh cac muc phu hop vdi cac bo khuech dai cong suat cao tuong ung Bo khuech dai cong suat cao du phong: So luong bo khuech dai cong suat du phong toi thieu la 20% (TBD) d) Yeu cau phan khung ve tinh * He thong Dieu khien/Do xa (TT&C) He thong lenh, xa, va cu ly (CT&R) cung cap kha nang giam sat va dieu khien ve tinh can thiet sudt thdi gian song cua no, bao gom qua trinh thu he thong mat dat, tir thdi diem trudc phong, phong, cac qua trinh chuyen tiep quT dao, hoat dong tren qui dao ke ca qui dao da nghieng tdi do, thu cac gian phat xa cua anten phan he thong tin He thong duac thiet ke de dam bao phat hien duac moi su suy giam va nhung hoat dong bat thuong dac tinh ky thuat cua ve tinh moi giai doan cua qua trinh phong ve tinh va hoat dong tren qui dao Tan so TT&C: Tan so phat Lenh va thu du lieu Do xa d bang Ku (TBD) Truyen tin qua anten vo huong duoc su dung suot qua trinh dieu khien ve tinh, tru da on dinh qui dao, he thong TT&C se su dung chinh anten thong tin va anten thu cua he thong TT&C duac thiet ke de cue tieu hoa he so tang ich doi vai tin hieu TT&C ngoai vung phu song cua VINASAT-2 Mat thong lugng tin hieu Lenh: Tren ve tinh, thiet bi nhan Lenh se lam viec vai mot tin hieu Lenh phat len co mat thong lugng tu -100 den -55dBW/m2 He thong nhan lenh se khong co phan hoi neu mat cong suat nho han -125dBW/m2 Cong suat buc xa dang huang tuong duang (EIRP) cua tin hieu Do xa: Tin hieu Do xa truyen tu ve tinh xuong co EIRP toi thieu la 15dBW de dam bao ty le loi bit cua bo giai ma d tram dieu khien BER