Transcript
For LEO Missions
X-band Modulator An X-band modulator with an ultra-high data rate of 800 Mbps that uses full digital modulation.
Applications Earth observation payloads Scientific missions
Main Features High data rate (over 800 Mbps) achieved with a single modulator Configurable Modulation scheme QPSK/16QAM modulation Compliant with SFCG recommendations and CCSDS standard Compatible with ZODIAC demodulators X-MOD (X-band high data rate modulator)
Qualifications & Heritage Qualification test completed Heritage: NEXTAR
Specifications Characteristics
Physical Characteristics
Frequency
8025 to 8400 MHz (Center Frequency: 8200 MHz nominal)
Dimensions
(W) 182 mm (D) 172 mm (H) 117.2 mm*3
Modulation
QPSK / 16QAM
Mass
2.37 kg (nom.)
Data rate
400 Mbps to 832.56 Mbps (16QAM) *1 200 Mbps to 416.28 Mbps (QPSK) *1
Output power
-4.5 dBm ± 1.0 dB
Bandwidth
< 300 MHz
Carrier suppression ratio
≦ 45 dBc
Power consumption
20.8 W (nom.) 25.0 W (max.)
DC power supply
+32 V to +52 V*2
Environment Temperature
-20℃ to +50℃ (operating) -30℃ to +60℃ (not operating)
Lifetime
5 years in LEO
Vibration
8.6 Grms (XY axis) 21.1 Grms (Z axis)
*1 Flight-proven value *2 The power supply voltage can be modified to meet customer requirements. *3 Excluding external filter
X-band Modulator Payload Interface Payload data interface
LVDS SerDes 16QAM modulation 4 ch × 16 bits (for 16QAM) QPSK Modulation 2 ch × 16 bits (for QPSK)
Reference clock interface
52.035 MHz sine wave
(in the case of 832.56Mbps data rate)
Features Frequency Determination Flexibility RF output center frequency is adjustable within a range of ±10MHz from center frequency with full digital modulation.
Ideal I/Q Balance Full digital modulation enables ideal I/Q modulation, reducing I/Q imbalance and I/Q phase imbalance to almost zero.
Lifetime Extension The lifetime can be extended through mechanical modifications. (Some mechanical specifications will change.)
Deep Space Band Protection Our modulator is compliant with the criteria to protect the deep space network band established by the ITU. Emissions in the band can be cut by the high attenuation filter mounted in the final stage of the RF output line.
Future Prospects Full digital modulation makes it possible to increase the data rate up to 1000 Mbps with no electrical design changes. Even higher data rate operation is currently being tested.
Data Transmission Subsystems NEC provides data transmission payloads featuring a variety of frequencies, output power characteristics, and redundancy. We design and manufacture every component on the data transmission payload, and perform assembly, adjustment and testing in our own facilities.
X-FIL (X-band filter for data transmission) X-SSPA (X-band highpower amplifier) X-band antenna Data recorder
X-band modulator
NEC Corporation Satellite Systems and Equipment Global Business Unit 1-10 Nisshin-cho, Fuchu, Tokyo, 183-8501, JAPAN TEL: +81-42-333-5001 FAX : +81-42-333-5002 URL: http://www.nec.com/en/global/solutions/space/
X-band high power AMP
X-band filter
NEC Space Technologies, Ltd. 1-10 Nisshin-cho, Fuchu, Tokyo, 183-8551, JAPAN URL: http://www.necspace.co.jp/en/
NEC-PRM-15002
