ALOS Data Users Handbook

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Section 3 Outline of ALOS Satellite System3.2.2 Other Mission Instruments3.2.2.1 Deployment Monitor (DM)DM monitors unfolding behaviors of the solar paddle, the DRC antenna, and the PALSAR antenna, and alsomonitors disturbance of the spacecraft during deployments. DM is a CCD camera system consisting of sixcameras to carry out real-time monitoring by compressed images or detailed monitoring by stored data on eachdeployment during the critical phase. The real-time data are transmitted via HKDR of the TT&C system. Thestored data are recorded onto MDR of the MDHS system and then transmitted as mission data afterestablishment of communication links.Table 3.2-11 DM Operation ModesModesNumber of OperatingCameraAll-off 0Standby 0Solar Paddle Deployment3 (Max)DRC Antenna Deployment3 (Max)PALSAR Antenna Deployment3 (Max)S/C Attitude Disturbance Monitor3 (Max)3.2.2.2 TEDATEDA is a sensor to measure space environment and consists of the following two sensors:• Light Particle Telescope (LPT) to monitor energy and flux of electron, proton, and alpha particle;• Heavy Ion Telescope (HIT) to monitor spatial distribution and transition of heavy ions.Data from TEDA are multiplexed as low rate mission data at MDHS, recorded onto LSSR, and then reproducedto ground. TEDA normally operates 24 hours per day.3.2.2.3 LR (Laser Reflector)LR is an instrument for ranging of the satellite to reflect lasers transmitted from ground forward incidentdirection with the corner cubic reflector. There is no data interface with any other onboard equipment.LR is loaded on earth directional side of ALOS to receive laser signals transmitted from ground. Precise location3-18
ALOS Data Users Handbookof satellite is determined by measuring the time that the laser signals come back to laser ranging station on theground after reflected by LR. LR can reflect signals to the same direction that those come from because LR hasstructure of complexes of three mirrors combined with 90 degrees.Figure 3.2-6 Overview of Laser Reflector3.2.3 Mission Data Handling System (MDHS)The function of MDHS is as follows:• Data Compression• Data Multiplex and Coding• Data Recording and Reproduction• Data Relay Satellite Communication• Direct TransmissionMDHS consists of the following subsystems for each function:• Data Compression (DC)• Mission Data Coding (MDC)• Mission Data Recorder (MDR)• Data Relay Satellite Communication (DRC)• Direct Transmission (DT)The main function of each subsystem is shown below:3-19
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ALOS Data Users HandbookSection 8 D
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ALOS Data Users Handbook8.5 Outline
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APPENDIXALOS Data Users Handbook
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Appendix 1 Acronyms and Abbreviatio
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ALOS Data Users HandbookAppendix 2
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