Frequency, Link Design
Operation Frequency
| Line | Direction | Freq. MHz |
TX Pwr. W |
B.W. kHz |
Mod. | Pol. | Purpose |
|---|---|---|---|---|---|---|---|
| UUC | Gnd->Sat | UHF(TBD) | 50 | 20 | F2D | VH | Tele-Command |
| UUA | Gnd->Sat | UHF(TBD) | 50 | 10 | F1D | VH | Commun. Exp. /Tele-Command |
| UDC | Sat->Gnd | UHF(TBD) | 0.8/0.8/0.1 | 20 /20 /0.5 | F1D /F2D /A1A | VH | Telemetry/ Beacon |
| UDA | Sat->Gnd | UHF(TBD) | 0.01 | 0.52 | F1D | VH | Commun. Exp. |
Link Design
| No. | Item | Unit | UDC↓ | UDA↓ | Comment | ||
|---|---|---|---|---|---|---|---|
| Modulation | F1D | F2D | A1A | F1D | |||
| Format | TBD | TBD | Morse | WSJT | |||
| (1) | Transmission frequency |
MHz | 437 | 437 | |||
| (2) | Transmission power |
dBm | 29.0 | 29.0 | 20.0 | 10 | 0.8W, 0.1W & 0.01W |
| (2a) | Bandwidth | kHz | 10.0 | 20.0 | 0.5 | 0.52 | |
| (2b) | Maximum power density |
dBW/Hz | -44.0 | -44.0 | -37.0 | -47.2 | =(2)-10log(2a)-30 |
| (3) | Transmitter feeder loss |
dB | 0.5 | 0.5 | |||
| (4) | Transmitter antenna gain |
dBi | 0.0 | 0.0 | Dual Mono Pole(1.3dB) | ||
| (5) | EIRP | dBm | 29.8 | 20.8 | 9.5 | =(2)-(3)+(4) | |
| (6) | Polarization loss | dB | 3.0 | 3.0 | |||
| (7) | Communication distance |
km | 1097 | 2867 | 2867 | 2867 | Sat. Height=613 km |
| (8) | Elevation Angle |
deg | 30 | 0 | 0 | 0 | |
| (9) | Transmission loss in free space |
dB | 146.0 | 154.4 | 154.4 | 154.4 | =32.4+20log(f[MHz]) +20log(d[km]) |
| (10) | Ionospheric absorption loss |
dB | 0.5 | 0.5 | 0.5 | 0.5 | |
| (11) | Rainfall loss | dB | 0.1 | 0.1 | 0.1 | 0.1 | |
| (12) | Antenna pointing loss |
dB | 0.2 | 0.2 | 0.2 | 0.2 | |
| (13) | Receiver antenna gain |
dBi | 22.0 | 22.0 | 0.0 | 0.0 | Yagi Ant.(22dB) and Mono Pole (0dB) |
| (14) | Receiver feeder loss |
dB | 1.0 | 1.0 | 1.0 | 1.0 | |
| (15) | Receiver input signal power |
dBm | -98.5 | -106.8 | -137.9 | -149.2 | =(5)-(6)-(9)-(10)-(11)-(12) +(13)-(14) |
| (16) | Receiver noise power density |
dBm/Hz | -164.8 | -164.8 | -164.8 | -164.8 | -123 dBm(Typ)@3kHz. Note (A) |
| (17) | C/N0 (Expected) | dBHz | 58.1 | 49.7 | 34.7 | 23.2 | =(15)-(16)-10*log10(BW/3kHz) |
| (18) | Loss in mod/ demod proc. |
dB | 3 | 3 | 3 | -20 | Minus sign shows GAIN |
| (19) | Noise bandwidth | dBHz | 39.8 | 30.8 | 10.0 | 12.1 | =10log(Bit Rate) |
| (20) | Eb/N0 | dB | 13.3 | 13.3 | 13.3 | 13.3 | FSK, BER=1e-5 |
| (21) | S/N0 | dB | 53.1 | 44.1 | 23.3 | 25.1 | =(19)+(20) |
| (22) | C/N0 (Required) | dBHz | 56.1 | 47.1 | 26.3 | 5.4 | =(18)+(21) |
| (23) | Link margin | dB | 1.9 | 2.6 | 8.4 | 17.9 | =(17)-(22) |
| No. | Item | Unit | UUC↑ | UUA↑ | Comment |
|---|---|---|---|---|---|
| Modulation | F2D | F1D | |||
| Format | Ori. | Ori. | |||
| (1) | Transmission frequency |
MHz | 435 | 435 | |
| (2) | Transmission power |
dBm | 47.0 | 47.0 | 50W |
| (2a) | Bandwidth | kHz | 20.0 | 10.0 | |
| (2b) | Maximum power density |
dBW/Hz | -26.0 | -28.0 | =(2)-10log(2a)-30 |
| (3) | Transmitter feeder loss |
dB | 6.0 | ||
| (4) | Transmitter antenna gain |
dBi | 15.0 | Yagi Ant. (15dB) | |
| (5) | EIRP | dBm | 56.0 | 56.0 | =(2)-(3)+(4) |
| (6) | Polarization loss | dB | 3.0 | ||
| (7) | Communication distance |
km | 2867 | 2867 | Sat. Height=600 km |
| (8) | Elevation Angle |
deg | 0 | 0 | |
| (9) | Transmission loss in free space |
dB | 154.3 | 154.3 | =32.4+20log(f[MHz]) +20log(d[km]) |
| (10) | Ionospheric absorption loss |
dB | 0.5 | 0.5 | |
| (11) | Rainfall loss | dB | 0.1 | 0.1 | |
| (12) | Antenna pointing loss |
dB | 0.2 | 0.2 | |
| (13) | Receiver antenna gain |
dBi | 1.3 | 1.3 | Dual Mono Pole |
| (14) | Receiver feeder loss |
dB | 0.5 | 0.5 | |
| (15) | Receiver input signal power |
dBm | -100.8 | -100.8 | =(5)-(6)-(9)-(10)-(11)-(12) +(13)-(14) |
| (16) | Receiver noise power density |
dBm/Hz | -164.8 | -164.8 | -123 dBm(Typ)@3kHz. Note (A) |
| (17) | C/N0 (Expected) | dBHz | 55.7 | 58.7 | =(15)-(16)-10*log10(BW/3kHz) |
| (18) | Loss in mod/ demod proc. |
dB | 3 | 3 | |
| (19) | Noise bandwidth | dBHz | 30.8 | 30.8 | =10log(Bit Rate) |
| (20) | Eb/N0 | dB | 13.3 | 13.3 | FSK, BER=1e-5 |
| (21) | S/N0 | dB | 44.1 | 44.1 | =(19)+(20) |
| (22) | C/N0 (Required) | dBHz | 47.1 | 47.1 | =(18)+(21) |
| (23) | Link margin | dB | 8.6 | 11.6 | =(17)-(22) |