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ASAR Data Formats Products
Geolocation Grid ADSRs
Doppler Centroid parameters
Chirp parameters
Antenna Elevation pattern
ASAR external characterization data
ASAR external calibration data
Level 0 SPH
Level 0 MDSR
SPH for auxiliary data with N=1 DSDs
Wave Mode Geolocation ADS
ASAR Wave Mode Products Base SPH
Slant Range to Ground Range conversion parameters
Measurement Data Set containing spectra. 1 MDSR per spectra.
Ocean Wave Spectra
Map Projection parameters
ASAR Image Products SPH
Measurement Data Set 1
Auxilliary Products
ASA_XCH_AX: ASAR External characterization data
ASA_XCA_AX: ASAR External calibration data
ASA_INS_AX: ASAR Instrument characterization
ASA_CON_AX: ASAR Processor Configuration
Browse Products
ASA_WS__BP: ASAR Wide Swath Browse Image
ASA_IM__BP: ASAR Image Mode Browse Image
ASA_GM__BP: ASAR Global Monitoring Mode Browse Image
ASA_AP__BP: ASAR Alternating Polarization Browse Image
Level 0 Products
ASA_WV__0P: ASAR Wave Mode Level 0
ASA_WS__0P: ASAR Wide Swath Mode Level 0
ASA_MS__0P: ASAR Level 0 Module Stepping Mode
ASA_IM__0P: ASAR Image Mode Level 0
ASA_GM__0P: ASAR Global Monitoring Mode Level 0
ASA_EC__0P: ASAR Level 0 External Characterization
ASA_APV_0P: ASAR Alternating Polarization Level 0 (Cross polar V)
ASA_APH_0P: ASAR Alternating Polarization Level 0 (Cross polar H)
ASA_APC_0P: ASAR Alternating Polarization Level 0 (Copolar)
Level 1 Products
ASA_IMS_1P: ASAR Image Mode Single Look Complex
ASA_IMP_1P: ASAR Image Mode Precision Image
ASA_IMM_1P: ASAR Image Mode Medium Resolution Image
ASA_IMG_1P: ASAR Image Mode Ellipsoid Geocoded Image
ASA_GM1_1P: ASAR Global Monitoring Mode Image
ASA_APS_1P: ASAR Alternating Polarization Mode Single Look Complex
ASA_APP_1P: ASAR Alternating Polarization Mode Precision Image
ASA_APM_1P: ASAR Alternating Polarization Medium Resolution Image product
ASA_WSS_1P: Wide Swath Mode SLC Image
ASA_WVS_1P: ASAR Wave Mode Imagette Cross Spectra
ASA_WSM_1P: ASAR Wide Swath Medium Resolution Image
ASA_APG_1P: ASAR Alternating Polarization Ellipsoid Geocoded Image
Level 2 Products
ASA_WVW_2P: ASAR Wave Mode Wave Spectra
ASAR Glossary Terms
Sea Ice Glossary
Land Glossary
Oceans Glossary
Geometry Glossary
ASAR Instrument Glossary
Acronyms and Abbreviations
ASAR Frequently Asked Questions
The ASAR Instrument
Instrument Characteristics and Performance
Inflight Performance Verification
Preflight Characteristics and Expected Performance
Instrument Description
Internal Data Flow
ASAR Instrument Functionality
Payload Description and Position on the Platform
ASAR Products and Algorithms
Auxiliary Products
Common Auxiliary Data Sets
Auxiliary Data Sets for Level 1B Processing
Summary of Auxiliary Data Sets
Instrument-specific Topics
Level 2 Product and Algorithms
Level 2 Product
ASAR Level 2 Algorithms
Level 1B Products
ASAR Level 0 Products
Level 0 Instrument Source Packet Description
Product Evolution History
Definitions and Conventions
Organisation of Products
ASAR Data Handling Cookbook
Hints and Algorithms for Higher Level Processing
Hints and Algorithms for Data Use
ASAR Characterisation and Calibration
The Derivation of Backscattering Coefficients and RCSs in ASAR Products
External Characterisation
Internal Calibration
Pre-flight Characterisation Measurements
ASAR Latency Throughput and Data Volume
Data Volume
Products and Algorithms Introduction
Child Products
The ASAR User Guide
Image Gallery
Further Reading
How to Use ASAR Data
Software Tools
How to Choose ASAR Data
Special Features of ASAR
Geophysical Coverage
Principles of Measurement
Scientific Background
Geophysical Measurements
ASAR Product Handbook
ASAR instrument characterization data
Wave Mode processing parameters
ASAR processor configuration data
Main Processing parameters
ASA_WVI_1P: ASAR Wave Mode SLC Imagette and Imagette Cross Spectra
Product Terms
RADAR and SAR Glossary
Level 1B Products
Summary of Applications vs Products
Site Map
Frequently asked questions
Terms of use
Contact us


5.4 ASAR Instrument Glossary

Table 5.4
Antenna Power Switching and Monitoring Subsystem (APSM) The Antenna Power Switching and Monitoring Subsystem (APSM) is part of the Antenna Subassembly (ASA) on the ASAR Instrument
Antenna Services Subsystem (ASS) The Antenna Services Subsystem (ASS) is part of the Antenna Subassembly (ASA) on the ASAR Instrument
Antenna Subassembly (ASA) The Antenna Subassembly (ASA) 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) is one of the two functional groups of the ASAR Instrument 3.1. . ( ASA is the other )
Control Subsystem (CSS) The Control Subsystem (CSS) 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.