GY T 150-2000 卫星数字电视接收站测量方法.室内单元测量.pdf

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1、 G Y /T 150 2000 Methods of measurement for satellite digital television receive only earth station measurement 2000-03-17 2000-04-01 GB/T 17700 1999 MPEG2 RS GB/T 11442 1995 4.3 GY/T 147 2000 GB/T 11298.4 1997 GB/T 11442 1995 GY/T 147 2000 A GY/T 1502000 37 1 2 GB/T 3659 1983 GB/T 11442 1995 GB/T 1

2、1298 1997 GB/T 17700 1999 GY/T 147 2000 GY/T 149 2000 3 15 35 C 45% 75% 86 106kPa 4 4.1 4.1.1 4.1.2 1 G Y /T 150 2000 Methods of measurement for satellite digital television receive only earth station measurement 2000-03-17 2000-04-01 GY/T 150-2000 38 1 a) 1 b) , c) 4.1.3 4.2 4.2.1 Z Zo L dB 1 Z + Z

3、o Z Zo Z Zo 4.2.2 2 2 a) 2 b) S 1 c) S 2 0dB d) S 3 L 4.2.3 L=20Lg dB 1 MPEG2 MPEG2 A V S 3 2 1GY/T 150-2000 39 4.3 4.3.1 dBm 4.3.2 3 3 a) 3 b) c) 4.3.3 4.4 4.4.1 4.4.2 4 4 a) 4 b) fL0 , fI fL0+fI f L0 fI c) fL0+fI f L0 fI 4.4.3 4.5 Eb/No MPEG2 MPEG2 V A GY/T 150-2000 40 4.5.1 Eb/No 2 10 -4 Eb/No Eb

4、/No dB 4.5.2 5 5 Eb/No a) 5 b) S 1 , c) C/N d) S 2 C No 2 Eb/No Eb/No = C No 10lgRU dB 2 RU = 2Rs Cr RS RU Rs MS/s Cr RS (188/204) 4.5.3 4.6 4.6.1 4.6.2 5 a) 5 b) C/N MPEG2 MPEG2 V A 1 2 SGY/T 150-2000 41 , c) 4.6.3 4.7 4.7.1 dBm 4.7.2 6 6 a) 6 b) 75% c) 4.7.3 4.8 4.8.1 MHz 4.8.2 a) 1 b) , c) 4.8.3

5、4.9 4.9.1 4.9.2 a) 1 b) MPEG2 MPEG2 VGY/T 150-2000 42 c) 4.9.3 4.10 4.10.1 dB 4.10.2 7 7 a) 7 b) Sinx/x 8 c) Sinx/x 4.10.3 8 Sinx/x volts 1.0 0.5 0.0 MPEG2 MPEG2 V AGY/T 150-2000 43 4.11 K 4.11.1 K Kb Kpb Kp K50 K50 K K 4.11.2 4.12 4.13 4.14 4.11.3 4.12 (Kb) 4.12.1 4.12.2 a) 7 b) B3 9 c) Bar& LineTi

6、me 9 B3 4.12.3 4.13 2T (Kpb)2T 4.13.1 2T 2T volts B3 0.5 0.0 1.0 volts GY/T 150-2000 44 4.13.2 a) 7 b) 2T B1 B3 10 c) K 10 2T B1 B3 4.13.3 4.14 2T (Kp) 4.14.1 2T 2T 4.14.2 a) 7 b) 2T B1 B3 10 c) K 4.14.3 4.15 / ( K) 4.15.1 20T( 10T) / 4.15.2 a) 7 b) 11 volts 1.0 0.5 0.0 B3 B1 GY/T 150-2000 45 11 20T

7、 10T c) / 4.15.3 4.16 / ( ) 4.16.1 20T( 10T) / 4.16.2 a) 7 b) 11 c) / 4.16.3 4.17 4.17.1 4.17.2 a) 7 b 12 volts 1.0 0.5 0.0 GY/T 150-2000 46 12 c) 12.5% 50% 87.5% 4.17.3 4.18 4.18.1 4.18.2 a) 7 b) 13 13 c) volts 1.0 0.5 0.0 volts 1.0 0.5 0.0 GY/T 150-2000 47 12.5% 50% 87.5% 4.18.3 4.19 4.19.1 4.19.2

8、 a) 7 b) 13 c) 12.5% 50% 87.5% 4.19.3 4.20 (S/N) 4.20.1 (S/N) dB (3) (S/N) w = 20lg (700mVp-p)/ +W (3) W A 4.20.2 a) 7 b) 50% 14 14 50% volts 1.0 0.5 0.0 GY/T 150-2000 48 c) 700mVp-p d 100kHz 5MHz S/N 4.20.3 4.21 4.21.1 ns 4.21.2 a) 7 b) c) Jiter , 4.21.3 4.22 4.22.1 Z Zo L dB 4 Z + Zo Z Zo Z Zo 4.22.2 11 11 a) 11 b) S 1 c) S 2 0dB d) S 3 L L=20Lg dB 4 S V 3 2 1 GY/T 150-2000 49 4.22.3 4.23 4.23.1 (1KHz) dB