Link Budget
Link design result is below. As these tables, RF link is plus margin and it is possible to demonstratetechnology of 115.2 kbps (GMSK) transmitter. Furthermore，orbital attitude is designed for 613 km which wewill launch.
Table A. 1 Circuit design of FM down link and CW down link
ModeFMCW

Antenna Type
Orbit Altitude

Monopole Antenna
613 H[km]Monopole Antenna
613 H[km]Maximum Transmission Distance1962.01962.0Spacecraft

Elevation Angle
Spacecraft Transmitter Power Output
Downlink Frequency

10

θEL[deg]

D[km]10θEL[deg]0.8

PTX[W]0.1

PTX[W]

437.6

f[MHz]

437.6

f[MHz]

1.6

LFTX[dB]

1.6

LFTX[dB]

2.0

GATX[dB]

2.0

GATX[dB]-0.57

PE[dBW]-9.6

PE[dBW]

Spacecraft Total Transmission Line Losses
Spacecraft Antenna GainSpacecraft EIRP

D[km]Downlink PathSpacecraft Antenna Pointing Loss
S/C-to-Ground Antenna Polarization Loss
Path Loss
Atmospheric Loss
Ionospheric Loss
Rain Loss
Isotropic Signal Level at Ground Station
Ground Station Antenna Pointing Loss
Ground Station Antenna Gain

0LAPt[dB]0LAPt[dB]

0.5

LP[dB]

0.5

LP[dB]

151.1
1.10.80-163.1

Ld[dB]
LA[dB]
LI[dB]
LRA[dB]
C[dBW]

0.2
18

LAPr[dB]GARX[dB]

1.9

LFRX[dB]

151.1 Ld[dB]
1.1 LA[dB]
0.8 LI[dB]
0 LRA[dB]-154.1 C[dBW]
Ground Station (EbNo Method)
0.2 LAPr[dB]
18 GARX[dB]

Ground Station Total Transmission Line Losses

1.9

LFRX[dB]

Ground Station Effective Noise Temperature
490 TA[K]490 TA[K]Ground Station Figure of Merit (G/T)-10.8 G/T[dB/K]-10.8 G/T[dB/K]
G.S. Signal-to-Noise Power Density (S/No)
63.5 C/N0[dB]
54.5 C/N0[dB]
System Desired Data Rate
1,200 Bps[bps]100 Bps[bps]Telemetry System Eb/No for the Downlink
32.7 [dB]34.5 [dB]
Demodulation Method Selected
FSKCW
Forward Error Correction Coding Used
None
None
System Allowed or Specified Bit-Error-Rate
0.000001 Pb
0.000001 Pb
Demodulator Implementation Loss
1 LD[dB]
1 LD[dB]
Telemetry System Required Eb/No
23.2 (Eb/N0)req[dB]
16 (Eb/N0)req[dB]
Eb/No Threshold
24.2 [dB]
17 [dB]
System Link Margin
8.5 M[dB]17.5 M[dB]
Ground Station Alternative Signal Analysis Method (SNR Computation)
Ground Station Antenna Pointing Loss
0.20 [dB]
0.20 [dB]
Ground Station Antenna Gain18.0 [dBi]18.0 [dBi]
Ground Station Total Transmission Line Losses
1.90 [dB]1.90 [dB]
Ground Station Effective Noise Temperature
490.0 [K]490.0 [K]Ground Station Figure of Merit (G/T)-10.8 [dB/K]-10.8 [dB/K]
Signal Power at Ground Station LNA Input-138.2 [dBW]-147.2 [dBW]
Ground Station Receiver Bandwidth (B)10.0 [kHz]3.0 [kHz]
G.S. Receiver Noise Power (Pn = kTB)
-161.7 [dBW]-166.9 [dBW]
Signal-to-Noise Power Ratio at G.S. Rcvr
23.5 [dB]19.7 [dB]
Analog or Digital System Required S/N
23.2 [dB]
16.0 [dB]
System Link Margin
0.3 [dB]
3.7 [dB]- A.1 -Table A. 2 Circuit design of GMSK down linkMode

GMSK（115ｂｐｓ）
Spacecraft

Antenna Type
Orbit Altitude

Monopole Antenna
613 H[km]Maximum Transmission Distance1962.0D[km]Elevation Angle

10θEL[deg]Spacecraft Transmitter Power Output

0.8

PTX[W]

437.6

f[MHz]Spacecraft Total Transmission Line Losses

1.6

LFTX[dB]

Spacecraft Antenna Gain

2.0

GATX[dB]-0.57

PE[dBW]

Spacecraft Antenna Pointing Loss

4.7

LAPt[dB]

S/C-to-Ground Antenna Polarization Loss

0.5

LP[dB]

151.1

Ld[dB]

Atmospheric Loss

1.1

LA[dB]

Ionospheric Loss

0.8

LI[dB]0

LRA[dB]-158.8C[dBW]

Ground Station Antenna Pointing Loss

0.2

LAPr[dB]

Ground Station Antenna Gain

18

GARX[dB]

Ground Station Total Transmission Line Losses

1.9

LFRX[dB]

Ground Station Effective Noise Temperature

490

TA[K]

Ground Station Figure of Merit (G/T)-10.8

G/T[dB/K]

58.8

C/N0[dB]

115,200

Bps[bps]

Downlink Frequency

Spacecraft EIRP
Downlink Path

Path Loss

Rain Loss
Isotropic Signal Level at Ground Station
Ground Station (EbNo Method)

G.S. Signal-to-Noise Power Density (S/No)
System Desired Data Rate
Telemetry System Eb/No for the Downlink

8.2

Demodulation Method Selected

GMSK

Forward Error Correction Coding Used

[dB]

LDPC

System Allowed or Specified Bit-Error-Rate

0.000001

Pb

Demodulator Implementation Loss

1

LD[dB]

Telemetry System Required Eb/No

5.5(Eb/N0)req[dB]

Eb/No Threshold

6.5[dB]

System Link Margin

1.7M[dB]

Ground Station Alternative Signal Analysis Method (SNR Computation)
Ground Station Antenna Pointing Loss

0.20

[dB]

Ground Station Antenna Gain

18.0

[dBi]

Ground Station Total Transmission Line Losses

1.90

[dB]

Ground Station Effective Noise Temperature

490.0

[K]

Ground Station Figure of Merit (G/T)-10.8[dB/K]

Signal Power at Ground Station LNA Input-142.9[dBW]

Ground Station Receiver Bandwidth (B)

150.0

[kHz]

G.S. Receiver Noise Power (Pn = kTB)

-149.9[dBW]

Signal-to-Noise Power Ratio at G.S. Rcvr

7.1

[dB]

Analog or Digital System Required S/N

5.5[dB]

System Link Margin

1.6[dB]- A.2 -Table A. 3 Circuit design of FM up link
FM
Ground StationAntenna Type
Cross Yagi Antenna 2 stack
Ground Station Latitude
34.292655[deg]
Ground Station Longitude
134.063769[deg]
Elevation Angle
10 θEL[deg]Ground Station Transmitter Power Output
50 PTX[W]
Uplink Frequency
437.6 f[MHz]Ground Station, Total Transmission Line Losses
3.6 LFTX[dB]
Antenna Gain
16.0 GATX[dB]
Ground Station EIRP
29.4 PE[dBW]
Uplink Path
Ground Station Antenna Pointing Loss
0.1 LAPt[dB]
Gnd-to-S/C Antenna Polarization Losses
0.5 LP[dB]
Path Loss
151.12 Ld[dB]
Atmospheric Loss
1.1 LA[dB]
Ionospheric Loss
0.7 LI[dB]
Rain Loss
0 LRA[dB]
Isotropic Signal Level at Ground Station-124.1 C[dBW]Spacecraft Station (EbNo Method)
Spacecraft Antenna Pointing Loss
4.7 LAPr[dB]
Spacecraft Antenna Gain
2 GARX[dB]
Spacecraft Total Transmission Line Losses
2 LFRX[dB]
Spacecraft Effective Noise Temperature
220 TA[K]Spacecraft Figure of Merit (G/T)-23.4 G/T[dB/K]
S/C Signal-to-Noise Power Density (S/No)
76.3 C/N0[dB]
System Desired Data Rate
1,200 Bps[bps]Command System Eb/No
45.6 [dB]
Demodulation Method Selected
FSK
Forward Error Correction Coding Used
None
System Allowed or Specified Bit-Error-Rate
0.000001 Pb
Demodulator Implementation Loss
1 LD[dB]
Telemetry System Required Eb/No
10.5 (Eb/N0)req[dB]
Eb/No Threshold
11.5 [dB]
System Link Margin
34.1 M[dB]
Spacecraft Alternative Signal Analysis Method (SNR Computation)
Spacecraft Antenna Pointing Loss
4.70 [dB]Spacecraft Antenna Gain
2.0 [dBi]
Spacecraft Total Transmission Line Losses
2.00 [dB]Spacecraft Effective Noise Temperature
220.0 [K]Spacecraft Figure of Merit (G/T)-23.4 [dB/K]
Signal Power at Spacecraft LNA Input-128.8 [dBW]Spacecraft Receiver Bandwidth
10.0 [kHz]Spacecraft Receiver Noise Power (Pn = kTB)
-165.2 [dBW]
Signal-to-Noise Power Ratio at G.S. Rcvr
36.3 [dB]
Analog or Digital System Required S/N
10.5 [dB]
System Link Margin25.8 [dB]
Mode- A.3 -