Frequency, Link Design

Operation Frequency

Line Direction Freq.
MHz
TX Pwr.
W
B.W.
kHz
Mod. Pol. Purpose
UUC Gnd->Sat UHF(-) 50 20 F2D VH Tele-Command
UUA Gnd->Sat UHF(-) 50 10 F1D VH Commun. Exp.
/Tele-Command
UDC Sat->Gnd UHF(437.39 MHz) 0.8/0.8/0.1 20 /20 /0.5 F1D /F2D /A1A VH Telemetry/ Beacon
UDA Sat->Gnd UHF(437.51 MHz) 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)
Note(A) Receiver noise power density listed in this table is that of existing on-board receiver developed by Nishi-musen Co. Ltd, Japan.