Tài liệu Thiết kế tuyến vi ba số, chương 7 ppt

... CHƯƠNG 7: SẮP XẾP BẢO TRÌĐối với một hệ thống Viba điểm nối điểm mỗi tuyến chỉ có hai trạm đầu cuối liên lạc với nhau ... bảo đảm xác suất gián đoạn mạch là thấp nhất nó thường được áp dụng cho các tuyến Viba.Mỗi đường truyền Viba xác đònh đều có một BER xác đònh phụ thuộc vào chỉ tiêu phục vụ và loại tín hiệu ... thu hoặc nguồn pin ).5.Kiểm tra các thiết bò và dụng cụ6.Công vi c lắp đặt.- Tình trạng công vi c.- Giám sát công vi c. 7. Độ lệch tần số.Theo đề nghò của CCIR cho ta các giá trò tiêu chuẩn...

... lạc điểm nối điểm.Khoản cách các đường truyền VibaBảng 2-5-1 cho ta các khoảng cách đường truyền Viba cho các mạch trung kế các hệ thống Viba điểm nối điểm. Các giá trò trong bản là các giá ... dưới 47 dBw cho bất kỳ anten nào chỉ thẳng đến q đạo vệ tinh 0.50 , từ 47 đến 55 dBw khi góc này từ 0.50 - 1.50.2. sự kiểm tra tuyến viba:Trong khi chọn vò trí của các hệ thống Viba điểm ... nhiều nơi.Băng RF (MHz) Khoản cách đường Viba tiêu chuẩn (Km)20004000600011000 70 20%5020%5020%3020%Bảng 2-5-1: Khoản cách các đường truyền Viba tiêu chuẩn Khi vẽ một đường thiết kế...

... 1504 2M71421- Module khuếch đại công suất 1B71424- Module kích thích 2B71426Board mạch in tập hợp các băng gốc phát 2B71430- Máy thu RMD1504 2B71431Bộ chuyển đổi (Module chuyển đổi 1B71434)- ... chuyển đổi 1B71434)- Module trung tần 2B714 37 - Board mạch in tập hợp các băng gốc thu 2B71440- Board mạch in tập hợp hiển thò 1B71444- Bộ trộn 1B71445- Các phụ kiệnThiết bò RMD 1504 có ... CHƯƠNG 8: GIỚI THIỆU THIẾT BỊ SỬ DỤNG RMD1504 Thiết bò sử dụng cho tuyến Viba số là RMD1504 (Radio Microware Digital 1504) hiện nay...

... sinh vi n theo học nghành Viba, dự kiến trong tương lai do sự phát triển mạnh mẽ của lónh vực bưu chính Vi n thông. Nói chung yêu cầu đào tạo sinh vi n của nghành Viba sẽ tăng mạnh. Số sinh vi n ... các sinh vi n theo học nghành Viba ở hai trung tâm. Đây cũng là một cơ hội giúp nhóm thực hiện tiếp cận khảo sát với các thiết bò Viba số. Hiện nay theo tài liệu của trung tâm mỗi khóa học ... tuyến Viba cần thực hiện là 30 kênh làm vi c. Ta dùng thông số này kết hợp với các yếu tố khác để chọn băng tần làm vi c cho hệ thống. Một số vấn đề có ảnh hưởng đến vi c chọn băng tần làm vi c...

... 20.142800 9000 20. 67 3000 8800 21.153200 8600 21.603400 8400 22.003600 8200 22. 37 3800 8000 22 .70 4000 78 00 23.004200 76 00 23.264400 74 00 23.494600 72 00 23.694800 70 00 23.865000 6800 ... 1.483000 8800 1.553200 8600 1.623400 8400 1.683600 8200 1 .74 3800 8000 1 .79 4000 78 00 1.844200 76 00 1.884400 74 00 1.924600 72 00 1.954800 70 00 1.985000 6800 2.005200 6600 2.025400 6400 2.035600 ... 24 -1.501600 10200 24 -3. 17 3400 8400 24 -2.613600 8200 24 -2. 57 3800 8000 24 -2.534000 78 00 24 -2.504200 76 00 24 -2.484400 74 00 24 -2.464600 72 00 24 -2.445100 670 0 23 -3.425400 6400 23...

... = 10,3 dTa = 10,3*11,8*10-0,5*20 ,78 /10 (1,5)-0,5 ,BER>10-3Ta = 7, 206sTb = 10,3*11,8*10-0,5*20 ,78 /10 (1,5)-0,5 ,BER>10-6Tb = 9, 071 s4. Xác suất fading dài hơn 10s và ... đạt các mức ngưỡng RXa và RXb.Pa = 101FMa/10Pa = 10 –2, 278 = 5, 27* 10-3 dBPb = 101FMb/10Pb = 10 –2, 078 = 8,36*10-3 dB3.Khoảng thời gian Fading: TTa = C210-a2Fma/10 ... BER>10-6 do Fading chọn lựa = 9, 37* 10 -7 *9,82 = 9,210*10-613.Tổng BER>10-6.Tổng gián đoạn thông tin BER>10-6 = ,210*10-6+4,49*10-5 = 5,41*10-5CHƯƠNG 12: CÁC TÍNH TOÁN KHẢ NĂNG...

... do đó công vi c bảo trì trong thực tế cũng rất quan trọng.Công vi c bảo trì được chia thành hai loại:a/ Bảo trì đònh kỳ.Công vi c bảo trì đònh kỳ cho hệ thống thường gồm các công vi c sau:- ... CHƯƠNG 13: CẤU HÌNH HỆ THỐNG1.Dạng cơ bảnDạng cơ bản của một hệ thống Viba điểm nối điểm có cấu hình đơn giản không dùng hệ thống ... có phẫm chât tương đương hoặc tốt hơn. Bảng liệt kê này bao gồm các thiết bò đo trường và các thiết bò thêm có thể được yêu cầu cho vi c mô phỏng kiểm tra liên lạc ở trạm sửa chữa. Giả đònh...

... CHƯƠNG 14: CHƯƠNG TRÌNH TÍNH TOÁNTUYẾN VIBAGIẢI THUẬT CHƯƠNG TRÌNHf: là tần số trung tâm của sóng mang (GHz)d: là độ dài...

... erfdr[260]={1.000000,0.994358,0.98 871 7,0.983 076 ,0. 977 435,0. 971 976 ,0.961590,0.960523,0.954889,0.9492 57, 0.943628,0.938002,0.932 378 ,0.92 675 9,0.921142,0.915530,0.909922,0.904318,0.89 871 9,0.893126,0.8 875 37, 0.881954,0. 876 377 ,0. 870 806,0.965242,0.859684,0.854133,0.848589,0.843053,0.8 375 24,0.832004,0.826492,0.820988,0.815493,0.810008,0.804531,0 .79 9064,0 .79 36 07, 0 .78 8160,0 .78 272 3,0 .77 72 97, 0 .77 1882,0 .76 6 478 ,0 .76 1085,0 .75 570 4,0 .75 0335,0 .74 4 977 ,0 .73 9632,0 .73 4300,0 .72 8980,0 .72 3 674 ,0 .71 8380,0 .71 3100,0 .70 7834,0 .70 2582,0.6 973 44,0.692120,0.686911,0.68 171 7,0. 676 5 37, 0. 671 730,0.666225,0.661092,0.655 975 ,0.650 874 ,0.64 578 9,0.64 072 1,0.635 670 ,0.630635,0.625618,0.615635,0.6106 07, 0.60 572 3,0.60 079 4,0.595883,0.590990,0.5861 17, 0.581261,0. 576 425,0. 571 608,0.566810,0.562031,0.5 572 72,0.552532,0.5 478 13,0.543113,0.538434,0.53 377 3,0.529136,0.524518,0.519921,.51 078 9,0.506255,0.50 174 2,0. 479 250,0.49 278 0,0.488332,0.483905,0. 479 500,0. 475 1 17, 0. 470 756,0.466418,0.462101,0. 475 8 07, 0.453536,0.4492 87, 0.445061,0.4408 57, 0.436 677 ,0.432519,0.428384,0.424 273 ,0.420184,0.411619,0.412 077 ,0.408059,0.404063,0.400092,0.396144,0.392220,0.388319,0.384442,0.380589,0. 376 759,0. 372 954,0.369 172 ,0.635414,0.361680,0.3 579 71,0.354285,0.350623,0.346986,0.343 372 ,0.33 978 3,0.336248,0.332 677 ,0.329600,0.3256 67, 0.332199,0.31 875 5,0.315334,0.311939,0.3085 67, 0.305219,0.315896,0.2985 97, 0.295322,0.292 071 ,0.288844,0.285642,0.282463,0. 279 309,0. 276 178 ,0. 273 072 ,0.269990,0.266931,0.2638 97, 0.260886,0.2 578 99,0.254936,0.251996,0.249081,0.246189,0.243321,0.240 476 ,0.2 376 55,0.2348 57, 0.232083,0.229332,0.226604,0.223900,0.221218,0.218560,0.215925,0.213313,0.21 072 3,0.2081 57, 0.205613,0.203092,0.200593,0.1981 17, 0.195664,0.193232,0.190823,0.188436,0.186 072 ,0.18 372 9,0.181408,0. 179 109,0. 176 832,0. 174 576 ,0. 172 342,0. 179 130,0.1 679 38,0.16 576 8,0.163620,0.161492,0.159385,0.1 572 99,0.1 375 64,0.11 979 5,0.103 876 ,0.089686,0. 077 100,0.065992,0.56238,0.0 477 15,0.040305,0.033895,0.028 377 ,0.023652,0.019624,0.016210,0.013328,0.010901,0.0088889,0.0 072 096,0.00582 07, 0.004 677 8,0.00 374 19,0.002 979 5,0.0023614,0.0018629,0.00146 27, 0.0011432,0.00088929,0.00068853,0.00053060,0.000406 97, 0.00031068,0.00023605,0.000 178 50,0.00013434,0.00010062,0.000 075 0 17, 0.000055658,0.000041100,0.000030205,0.000022092,0.000016081,0.00000011649,0.00000839 87, 0.00000602 47, 0.0000043040,0.0000030593,0.00000216 37, 0.0000015200,0.0000010 673 ,0.00000 074 37, 0.0000005163,0.0000003563,0.0000002433,0.0000001683,0.00000011 37, 0.000000 076 ,0.00000005 27, 0.0000000353,0.00000002 27} ; ... erfd[260]={0.000,0.005,0.010,0.015,0.020,0.025,0.030,0.035,0.040,0.045,0.050,0.055,0.060,0.065,0. 070 ,0. 075 ,0.080,0.085,0.090,0.095,0.100,0.105,0.110,0.115,0.120,0.125,0.130,0.135,0.140,0.145,0.150,0.155,0.160,0.165,0. 170 ,0. 175 ,0.180,0.185,0.190,0.195,0.200,0.205,0.210,0.215,0.220,0.225,0.230,0.235,0.240,0.245,0.250,0.255,0.260,0.265,0. 270 ,0. 275 ,0.280,0.285,0.290,0.295,0.300,0.305,0.310,0.315,0.320,0.325,0.330,0.335,0.340,0.345,0.350,0.355,0.360,0.365,0. 370 ,0. 375 ,0.380,0.385,0.390,0.395,0.400,0.405,0.410,0.415,0.420,0.425,0.430,0.435,0.440,0.445,0.450,0.455,0.460,0.465,0. 470 ,0. 475 ,0.480,0.485,0.490,0.495,0.500,0.505,0.510,0.515,0.520,0.525,0.530,0.535,0.540,0.545,0.550,0.555,0.560,0.565,0. 570 ,0. 575 ,0.580,0.585,0.590,0.595,0.600,0.605,0.610,0.615,0.620,0.625,0.630,0.635,0.640,0.645,0.650,0.655,0.660,0.665,0. 670 ,0. 675 ,0.680,0.685,0.690,0.695,0 .70 0,0 .70 5,0 .71 0,0 .71 5,0 .72 0,0 .72 5,0 .73 0,0 .7 35,0 .74 0,0 .74 5,0 .75 0,0 .75 5,0 .76 0,0 .76 5,0 .77 0,0 .77 5,0 .78 0,0 .78 5,0 .79 0,0 .79 5,0.800,0.805,0.810,0.815,0.820,0.825,0.830,0.835,0.840,0.845,0.850,0.855,0.860,0.865,0. 870 ,0. 875 ,0.880,0.885,0.890,0.895,0.900,0.905,0.910,0.915,0.920,0.925,0.930,0.935,0.940,0.945,0.950,0.955,0.960,0.965,0. 970 ,0. 975 ,0.980,0.985,0.990,0.995,1.000,1.050,1.100,1.150,1.200,1.250,1.300,1.350,1.400,1.450,1.500,1.550,1.600,1.650,1 .70 0,1 .75 0,1.800,1.850,1.900,1.950,2.000,2.050,2.100,2.150,2.200,2.250,2.300,2.350,2.400,2.450,2.500,2.550,2.600,2.650,2 .70 0,2 .75 0,2.800,2.850,2.900,2.950,3.000,3.050,3.100,3.150,3.200,3.250,3.300,3.350,3.400,3.450,3.500,3.550,3.600,3.650,3 .70 0,3 .75 0,3.800,3.850,3.900,3.950,}; ... erfdr[260]={1.000000,0.994358,0.98 871 7,0.983 076 ,0. 977 435,0. 971 976 ,0.961590,0.960523,0.954889,0.9492 57, 0.943628,0.938002,0.932 378 ,0.92 675 9,0.921142,0.915530,0.909922,0.904318,0.89 871 9,0.893126,0.8 875 37, 0.881954,0. 876 377 ,0. 870 806,0.965242,0.859684,0.854133,0.848589,0.843053,0.8 375 24,0.832004,0.826492,0.820988,0.815493,0.810008,0.804531,0 .79 9064,0 .79 36 07, 0 .78 8160,0 .78 272 3,0 .77 72 97, 0 .77 1882,0 .76 6 478 ,0 .76 1085,0 .75 570 4,0 .75 0335,0 .74 4 977 ,0 .73 9632,0 .73 4300,0 .72 8980,0 .72 3 674 ,0 .71 8380,0 .71 3100,0 .70 7834,0 .70 2582,0.6 973 44,0.692120,0.686911,0.68 171 7,0. 676 5 37, 0. 671 730,0.666225,0.661092,0.655 975 ,0.650 874 ,0.64 578 9,0.64 072 1,0.635 670 ,0.630635,0.625618,0.615635,0.6106 07, 0.60 572 3,0.60 079 4,0.595883,0.590990,0.5861 17, 0.581261,0. 576 425,0. 571 608,0.566810,0.562031,0.5 572 72,0.552532,0.5 478 13,0.543113,0.538434,0.53 377 3,0.529136,0.524518,0.519921,.51 078 9,0.506255,0.50 174 2,0. 479 250,0.49 278 0,0.488332,0.483905,0. 479 500,0. 475 1 17, 0. 470 756,0.466418,0.462101,0. 475 8 07, 0.453536,0.4492 87, 0.445061,0.4408 57, 0.436 677 ,0.432519,0.428384,0.424 273 ,0.420184,0.411619,0.412 077 ,0.408059,0.404063,0.400092,0.396144,0.392220,0.388319,0.384442,0.380589,0. 376 759,0. 372 954,0.369 172 ,0.635414,0.361680,0.3 579 71,0.354285,0.350623,0.346986,0.343 372 ,0.33 978 3,0.336248,0.332 677 ,0.329600,0.3256 67, 0.332199,0.31 875 5,0.315334,0.311939,0.3085 67, 0.305219,0.315896,0.2985 97, 0.295322,0.292 071 ,0.288844,0.285642,0.282463,0. 279 309,0. 276 178 ,0. 273 072 ,0.269990,0.266931,0.2638 97, 0.260886,0.2 578 99,0.254936,0.251996,0.249081,0.246189,0.243321,0.240 476 ,0.2 376 55,0.2348 57, 0.232083,0.229332,0.226604,0.223900,0.221218,0.218560,0.215925,0.213313,0.21 072 3,0.2081 57, 0.205613,0.203092,0.200593,0.1981 17, 0.195664,0.193232,0.190823,0.188436,0.186 072 ,0.18 372 9,0.181408,0. 179 109,0. 176 832,0. 174 576 ,0. 172 342,0. 179 130,0.1 679 38,0.16 576 8,0.163620,0.161492,0.159385,0.1 572 99,0.1 375 64,0.11 979 5,0.103 876 ,0.089686,0. 077 100,0.065992,0.56238,0.0 477 15,0.040305,0.033895,0.028 377 ,0.023652,0.019624,0.016210,0.013328,0.010901,0.0088889,0.0 072 096,0.00582 07, 0.004 677 8,0.00 374 19,0.002 979 5,0.0023614,0.0018629,0.00146 27, 0.0011432,0.00088929,0.00068853,0.00053060,0.000406 97, 0.00031068,0.00023605,0.000 178 50,0.00013434,0.00010062,0.000 075 0 17, 0.000055658,0.000041100,0.000030205,0.000022092,0.000016081,0.00000011649,0.00000839 87, 0.00000602 47, 0.0000043040,0.0000030593,0.00000216 37, 0.0000015200,0.0000010 673 ,0.00000 074 37, 0.0000005163,0.0000003563,0.0000002433,0.0000001683,0.00000011 37, 0.000000 076 ,0.00000005 27, 0.0000000353,0.00000002 27} ;...

... tần số Viba khác có thể sử dụng trong các vùng liên quan.- Các trạm Viba có thể gây giao thoa đến hệ thống.- Vi c thiết kế một hệ thống Viba mới không gây nhiễu cho một một số hệ thống Viba đang ... băng RF (MHz)238 - 1385 279 - 1, 382 - 1383 - 1384 - 1386 - 13 87 60/12060/120/300300/18001800960/ 270 0300/9609601808,2000,2203 75 751903,2101,40036 475 677 0835011202003004005006803001000Bảng ... thống phụ V H-248.9 (F)-249.5 (A)250MHZ8’ 7 6’5’4’3’2’8’6’4’2’ 7 5’3’1’1’86428642 7 531 7 531250 MHzĐối với các hệ thống Viba điểm nối điểm. Do không có cấu hình trạm...