ASAR Instrument Glossary

14-Feb-2012

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5.4 ASAR Instrument Glossary

Table 5.4

Antenna Power Switching and Monitoring Subsystem (APSM)	The Antenna Power Switching and Monitoring Subsystem (APSM) 3.1.1.1. is part of the Antenna Subassembly (ASA) 3.1.1.1. on the ASAR Instrument
Antenna Services Subsystem (ASS)	The Antenna Services Subsystem (ASS) 3.1.1.1. is part of the Antenna Subassembly (ASA) 3.1.1.1. on the ASAR Instrument
Antenna Subassembly (ASA)	The Antenna Subassembly (ASA) 3.1.1.1. is one of the two functional groups of the ASAR Instrument 3.1. . ( CESA is the other )
Calibration Loop	The instrument calibration loop is used to perform three distinct functions. Firstly, it is used to characterise the instrument transfer function during the measurement modes. Secondly, it is used to characterise individual T/R modules. Finally, it is used in the special external characterisation mode. ( See the section entitled "ASAR Characterisation and Calibration" 2.11. in chapter 2)
Carbon Fibre Reinforced Plastic (CFRP)	A very stiff, and lightweight material with negligible thermal expansion coefficient
Control Electronics Sub-Assembly (CESA)	The Control Electronics Sub-Assembly (CESA) 3.1.1.2. is one of the two functional groups of the ASAR Instrument 3.1. . ( ASA is the other )
Control Subsystem (CSS)	The Control Subsystem (CSS) 3.1.1.2. drives the ASAR instrument by providing the command and control interface to the spacecraft, maintaining the database, managing the distribution of the operation parameters, and generating the time-lining of the instrument.
External Calibration	Absolute gain calibration of the ASAR using ground calibration transponders. ( see "ASAR Characterisation and Calibration" 2.11. and "Auxiliary Data Sets for Level 1B Processing" in chapter 2).
External Characterisation	Acalibration scheme used by ASAR that involves sending a series of pulses that are detected both by the internal calibration loop and the receiver embedded in the ground transponder. Used to monitor the passive part of the antenna, the calibration loop and the mechanical pointing of the antenna. ( see "ASAR Characterisation and Calibration" 2.11. and "Auxiliary Data Sets for Level 1B Processing" in chapter 2).
Instrument ( or Internal ) Calibration	A calibration scheme with the objective to derive the ASAR instrument internal path transfer function, and to perform noise calibration. This objective is realised by dedicated calibration signal paths and special calibration pulses within the instrument for making the required calibration measurements and by using these measurements to perform corrections within the ground processor. ( see "ASAR Characterisation and Calibration" 2.11. and "Auxiliary Data Sets for Level 1B Processing" in chapter 2).
Receiver Gain Droop	During the receive or echo window the gain droops by up to 0.9dB. The effect has been well characterized preflight and will be automatically corrected in the processor.
Tile Control Interface Unit (TCIU)	Mechanism in the Tile Subsystem (TSS) used to control the individual transmit/receive modules (TRM) of the ASA Subsystem in the ASAR Instrument.
Transmitter/Receiver Polarisation	The polarisation modes handled by ASAR's Active Phased Array Antenna.

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Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry