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CAST968
HY-2A
HY-2A
Credit: Manufacturer Image
Chinese spacecraft bus of around 500 kg and 1000 W power capability designed for use by Earth observation, communications, and technology demonstration satellites in sun synchronous orbit. Satellite bus built by CAST, China.

AKA: Haiyang. Status: Operational 2002. First Launch: 2002-05-15. Last Launch: 2011-08-15. Number: 3 .

The multi-mission CAST968 bus was box-shaped with overall dimensions of 1.4 m x 1.1 m x 0.953 m. The spacecraft was designed and developed by the DFH (Dongfanghong Satellite Corporation Ltd.), a spin-off company of CASC, Beijing, China. The total deployed span of the solar panels on HY-1 was 7.5 m. The CAST968 platform was built on 8 subsystems: structure and mechanism, thermal control, attitude and orbit control, power supply, TT&C, antenna, housekeeping and electrical subsystems. The main structure of the bus was of aluminum honeycomb sandwich panels.

The spacecraft was 3-axis stabilized (Earth pointing) using bias momentum control. The AOCS (Attitude and Orbit Control Subsystem) used three magnetorquers and hydrazine propulsion for attitude control and orbit change maneuvers; the attitude accuracy was 0.4 deg in roll and pitch and 0.5 deg in yaw. Attitude sensing was provided by digital sun sensors and infrared Earth sensors.

The PPS (Power Supply Subsystem) provided of 510 W (EOL) power via two solar arrays of 5.67 m2 area. These charged two packs of NiCd batteries of 23 Ah for night phase power supply. The solar array articulation was provided by a small single-axis SADA (Solar Array Drive Assembly). Electric power distribution was provided at 28.5 V.

Active and passive thermal control kept the internal temperature between 0 and 45 deg C. This was accomplished using Multi-Layered Insulation, heat pipes, thermal control coatings, and electric heaters. Temperature was actively controlled for equipment sensitive to temperature, such as the sensor complement, the battery and the fuel tank.

The TT&C communication was in S-band, the downlink date rate 4 kbit/s, the uplink rate 2 kbit/s. A USB (Unified S-band) system was used for TT&C with GPS information for auxiliary orbit determination. There were two TT&C antennas to ensure communications with the ground at any satellite attitude configuration. The GPS provided a location accuracy of 50 m. The TT&C subsystem was also used for ranging measurements, determining the distance between the satellite and the ground station using Doppler signals. An onboard storage capacity of 80 Gbit was provided. All payload data were downlinked in X-band using QPSK modulation at a data rate of 6.654 Mbit/s, EIRP = 39.4 dBm. In the case of HY-1 the payload data were acquired at the Beijing and the Sanya ground receiving stations.

Main Characteristics

Mission types: Earth observation, communications, technology demonstration
Design life: 3-5 years
Orbit type: Sun-synchronous orbit
Spacecraft mass, power: 100-400 kg, 250 - 1000 W. In the HY-1 application the spacecraft mass was 442.5 kg (including 13 kg of propellant); payload mass = 87 kg
AOCS (Attitude and Orbit Control Subsystem)
Control type: bias-wheel and magnetic torquer control to achieve three-axis stability
Attitude determination accuracy (3-axis): <= 0.2 deg (3 sigma)
Attitude pointing accuracy (3-axis): <= 0.4 deg (3 sigma)
Attitude stability (3-axis): <= 0.1 deg (3 sigma)
TTCS (Telemetry & Telecommand Subsystem)
Communication network: CAN (Controller Area Network) bus
Telemetry module mode: PCM/DPSK/PM
TT&C communication band: S-band
Telecommand data rate range: 2-8 kbit/s
Telemetry data rate range: 4-16 kbit/s
DTS (Data Transmission Subsystem): DT band (payload); X-band
Onboard data storage capacity: 128 Gbit
Max transmission rate: 320 Mbit/s
Data compression ratio: 8:1, 4:1


More at: Hy-2.

Subtopics

SJ 5 Technology satellite built by DFH Satellite Co. Ltd of CAST for CAST, China. Launched 1999. Used CAST968A Bus.

HY-1 Chinese earth land resources satellite. Operational, launched from 2002.05.15 (Hai Yang 1). Oceanograpy satellite built by DFH Satellite Co. Ltd of CAST for CAST, China. Launched 2002 - 2007. Used CAST968B Bus.

HJ 1A, 1B (SMMS 1) Earth observation satellite built by DFH Satellite Co. Ltd of CAST for CRESDA, China. Launched 2008. Used CAST968B Bus.

HJ 1C Earth observation, radar satellite built by DFH Satellite Co. Ltd of CAST for CRESDA, China. Launched 2012. Used CAST968B Bus.

Family: Earth. Country: China. Launch Vehicles: Chang Zheng 2C, Chang Zheng 4B. Launch Sites: Taiyuan LC1, Taiyuan LC2. Bibliography: 12174.
Photo Gallery

HJ-1AHJ-1A
Credit: Manufacturer Image


HY-1BHY-1B
Credit: Manufacturer Image



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