Analysis about Threshold Measurement Test Result of LEO Satellite Receiver

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RF Signal Conditioner

Switch1

Switch2

Switch3

Switch4 RIU

ASA

Power Meter 1 2 3 4 1 3 4

1 2 RF OUT

UP SIG#1

DN SIG#1 J1

RF IN

UP MON DN MON EXT MON SIG PATH

RF IN Signal

Synthesizer

Mycrodyne Receiver

Switch1

Switch2

Switch3

Switch4 RIU

ASA

Power Meter 1

3 4 1 3.

1 2

DN SIG#1 J1

ANT2(Zenith)

RF IN

UP MON DN MON

RF IN Mycrodyne

Receiver

Uplink Validation Uplink Validation Uplink Validation Uplink Validation을을을을 위한위한위한위한 측정구간측정구간측정구간측정구간

TEST1 TEST4

TEST2 TEST3

Receiver Antenna to Receiver Loss Antenna to Receiver LossAntenna to Receiver Loss Antenna to Receiver Loss

Uplink Calibration Coefficient

RF Assembly ANT1(Nadir)

EGSE/RFTS EGSE/RFTS EGSE/RFTS EGSE/RFTS

EGSE/RIU EGSE/RIU EGSE/RIU EGSE/RIU

LEO Satellite LEO SatelliteLEO Satellite LEO Satellite RF Signal

Conditioner Switch1

Switch2

Switch3

Switch4 RIU

ASA

Power Meter 1 2 3 4 1 3 4

1 2 RF OUT

UP SIG#1

DN SIG#1 J1

RF IN

UP MON DN MON EXT MON SIG PATH

RF IN Signal

Synthesizer

Mycrodyne Receiver

Switch1

Switch2

Switch3

Switch4 RIU

ASA

Power Meter 1

3 4 1 3.

1 2

DN SIG#1 J1

ANT2(Zenith)

RF IN

UP MON DN MON

RF IN Mycrodyne

Receiver

Uplink Validation Uplink Validation Uplink Validation Uplink Validation을을을을 위한위한위한위한 측정구간측정구간측정구간측정구간

TEST1 TEST4

TEST2 TEST3

Receiver Antenna to Receiver Loss Antenna to Receiver LossAntenna to Receiver Loss Antenna to Receiver Loss

Uplink Calibration Coefficient

RF Assembly ANT1(Nadir)

EGSE/RFTS EGSE/RFTS EGSE/RFTS EGSE/RFTS

EGSE/RIU EGSE/RIU EGSE/RIU EGSE/RIU

LEO Satellite LEO SatelliteLEO Satellite LEO Satellite

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Nadir to XP-A (TEST1)

Zenith to XP-B (TEST2)

Zenith to XP-A (TEST3)

Nadir to XP-B (TEST4) Receiver to

Antenna Loss -5.23 dB -5.25 dB -4.64 -4.98

Command & Receiver Locking Threshold Test

Start

Command Unlocking

Receiver Unlocking

Command & Receiver unlocking

Receiver Locking

Command Locking Threshold Test

Start

Uplink Signal Power Attenuation

Uplink Signal Power Increase

(a) Track Method (b)Acquisition Method

Command Threshold

Receiver Threshold Command Threshold

Receiver Threshold Command & Receiver

Locking Threshold Test

Start

Command Unlocking

Receiver Unlocking

Command & Receiver unlocking

Receiver Locking

Command Locking Threshold Test

Start

Uplink Signal Power Attenuation

Uplink Signal Power Increase

(a) Track Method (b)Acquisition Method

Command Threshold

Receiver Threshold Command Threshold

Receiver Threshold

RECEIVER A

TRANSMITTER A

TRANSMITTER B RECEIVER B SIGNAL

SYNTHESIZER RIU

A B

P1 : Signal Synthesizer Output Power P2 : External Power Meter 측정 포인트 A : RFTS Validation에서 측정 (P2-P1)

B : Unit Level에서 측정한 값 활용(RF Assembly Loss) P3 : Receiver & Command Threshold (P1-(A+B))

P1 P2 P3

DIPLEXER DIPLEXER HYBRID

COUPLER

RF SWITCH RF ASSEMBLY RF ASSEMBLY RF ASSEMBLY RF ASSEMBLY S-BAND

ANTENNA

NADIR

S-BADN ANTENNA ZENITH

RFTS RFTSRFTS

RFTS LEO SatLEO SatLEO SatLEO Sat

RECEIVER A

TRANSMITTER A

TRANSMITTER B RECEIVER B SIGNAL

SYNTHESIZER RIU

A B

P1 : Signal Synthesizer Output Power P2 : External Power Meter 측정 포인트 A : RFTS Validation에서 측정 (P2-P1)

B : Unit Level에서 측정한 값 활용(RF Assembly Loss) P3 : Receiver & Command Threshold (P1-(A+B))

P1 P2 P3

DIPLEXER DIPLEXER HYBRID

COUPLER

RF SWITCH RF ASSEMBLY RF ASSEMBLY RF ASSEMBLY RF ASSEMBLY S-BAND

ANTENNA

NADIR

S-BADN ANTENNA ZENITH

RFTS RFTSRFTS

RFTS LEO SatLEO SatLEO SatLEO Sat

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는

TEST1: OBC-P & XP-A and Nadir Antenna Path TEST2: OBC-R & XP-B and Zenith Antenna Path TEST3: OBC-R & XP-A and Zenith Antenna Path TEST4: OBC-P & XP-B and Nadir Antenna Path Receiver A&B : Receiver Threshold Detection

Command Detector A & B : Command Locking Detection:

TEST 1 TEST 1TEST 1

TEST 1 Rcvr Threshold [dBm]

CMD Threshold

[dBm]

Specification

Requirement ≥ -123 [dBm] ≥ -115 [dBm]

Bus BIST -132 -129

Bus FIST -133 -130

BTV_AMB -132 -129

BTV_POST -131 -128

EMC_POST -130 -127

1553_POST -128 -125

Final_BSOH -130 -127

FIST -130 -127

TV_AMB -129 -126

TV_POST -128 -125

Final FIST -129 -126

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TEST 2 TEST 2TEST 2

TEST 2 Rcvr Threshold [dBm]

CMD Threshold

[dBm]

Specification

Requirement ≥ -123 [dBm] ≥ -115 [dBm]

Bus BIST -124 -124

Bus FIST -125 -123

BTV_AMB -124 -124

EMC_POST -123 -123

POST_EMC -125 -123

FIST -124 -124

Post DYN -123 -121

TEST 1 TEST 1 TEST 1

TEST 1 UpLink Calibration Coefficient

Bus BIST -54.9

Bus FIST -54.9

BTV_AMB -54.9

BTV_POST -54.9

EMC_POST -53.1

1553_POST -53

Final_BSOH -54

FIST[ -53.9

TV_AMB -53.1

TV_POST -53.2

Final FIST -53.4

TEST 2 UpLink Calibration Coefficient

Bus BIST -54.7

Bus FIST -54.7

BTV_AMB -54.7

EMC_POST -53.3

Final_BSOH -53.4

POST_EMC -53.7

FIST -54.1

Post DYN -54.2

Final FIST -53.7

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TEST 1 TEST 1TEST 1

TEST 1 Rcvr Threshold [dBm ](보 정 후 )

CM D Threshold [dBm ](보 정 후 ) Specification

Requirem ent ≥ -123 [dBm ] ≥ -115 [dBm ]

Bus BIST -132 -129

Bus FIST -133 -130

BTV_AMB -132 -129

BTV_POST -131 -128

EM C_POST -130 -127

1553_POST -128 -125

FIST -130 -127

TV_AMB -129 -126

TV_POST -128 -125

평 균 값 -130 -127

표 준 편 차 1.167748 1.167748

TEST 2 Rcvr Threshold [dBm ](보 정 후 )

CM D Threshold [dBm ](보 정 후 ) Specification

Requirem ent ≥ -123 [dBm ] ≥ -115 [dBm ]

Bus BIST -124 -124

Bus FIST -125 -123

BTV_AMB -124 -124

EM C_POST -123 -123

POST_EMC -125 -123

FIST -124 -124

Post DYN -123 -121

평 균 값 123.7 122.8

표 준 편 차 0.70710678 0.97182532 TEST1

TEST1TEST1

TEST1 TEST2TEST2TEST2TEST2 삽입손실

(RFTS S.G →ASA) 53.3 -6.06 삽입손실

(RFTS S.G →PM) -37.94 -37.95 삽입손실

(RFTS S.G →외부 PM) -54.35 -54.65 Uplink Calibratin

Coefficient -53.5 -53.8

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