Research Article

A Spherical Micro Satellite Design and Detection Method for Upper Atmospheric Density Estimation

Table 2

Main components of the satellite.

SubsystemMain componentsKey specifications

StructureHemispherical frame (HF), payload cabin (PC), central connection ring (CCR), releasing device (RD)2A12-H112 aluminum alloy
PayloadDual-frequency GPS (D-GPS), single-frequency GPS (S-GPS), micro camera (MC)Real-time positioning (velocity) precision: less than 20 m (0.2 m/s)
Attitude controlInertial measurement unit (IMU), integrated full field sun sensor (IFFSS), magnetometer, flywheel, magnetorquerAttitude determination precision: 0.5°
Attitude control precision: 2°
PowerSolar cell array (SCA), power controller unit (PCU), battery (BAT)SCA: 931 cells of triple-junction GaAs (29.5%)
BAT capacity: 8.8 Ah
Bus voltage: 6.9–8.2 V
Secondary voltage: 12 V, 3.3 V, 5 V
Power consumption: 11.45 W (steady state)
Integrated electronicOnboard computer (OBC), attitude control computer (ACC), integrated electronic circuit board (IECB)Processing chip: LPC2294
Telemetry, telecontrol, and data transitionUnified S-band (USB), industrial scientific medical (ISM) band, power amplifier (PA), combinerUSB: Telemetry: 2000 bps
Telecontrol: 4096 bps
Data transition: 0.5 Mbps
ISM: 115.2 kbps