ICESat-2 ATLAS Level 1A处理算法理论基础文档概述

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ICESat-2-SIPS-SPEC-1601

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viii

Release Date TBD

Table of Contents

Abstract ............................................................................................................................ii

CM Foreword .................................................................................................................. iii

Preface ............................................................................................................................iv

Review/Approval Page .................................................................................................... v

Change History Log.........................................................................................................vi

List of TBDs/TBRs .......................................................................................................... vii

Table of Contents .......................................................................................................... viii

1.0 INTRODUCTION ................................................................................................ 12

2.0 OVERVIEW AND BACKGROUND INFORMATION ........................................... 13

2.1 Background ..................................................................................................... 13

2.2 Reformatted Telemetry (ATL01/L1A) .............................................................. 14

2.3 References ...................................................................................................... 15

3.0 ATL01 Product Description ................................................................................. 17

3.1 ATL01 Time of Day ......................................................................................... 17

3.2 ATLAS Telemetry ............................................................................................ 17

3.2.1 SM-HK data Packet ................................................................................. 17

3.2.2 PCE Altimetry Science Data Packet ........................................................ 18

3.2.2.1 Transmit Start Time Measurements .................................................................. 18

3.2.2.2 Received Photon Time Measurements.............................................................. 18

3.2.3 PCE Algorithm Science Packet ................................................................ 18

3.2.4 PCE 1 PPS time at the tone Packet ......................................................... 18

3.2.5 PCE Atmospheric Histogram Packet ....................................................... 19

3.3 LRS Telemetry ............................................................................................................ 19

3.4 Spacecraft Telemetry ...................................................................................... 19

3.5 Other inputs .................................................................................................... 20

4.0 ALGORITHM THEORY ...................................................................................... 21

4.1 ATLAS Telemetry ............................................................................................ 21

4.1.1 ATLAS Instrument ................................................................................... 21

ICESat-2-SIPS-SPEC-1601

Revision - Draft

Release Date TBD

4.1.2 LRS Instrument ........................................................................................ 21

4.1.2.1 LRS Application Mode ..................................................................................... 21

4.1.2.2 LRS Failsafe Mode ........................................................................................... 22

4.2 Spacecraft ....................................................................................................... 22

5.0 ALGORITHM IMPLEMENTATION ..................................................................... 23

5.1 Outline of Procedure ....................................................................................... 23

5.1.1 Input Variables ......................................................................................... 23

5.1.1.1 Parameters Required from ICESat-2 ................................................................ 23

Spacecraft Ancillary Science Data ............................................................................. 28

5.1.1.2 Parameters Required from Ancillary Sources ................................................... 33

5.1.1.3 Output Parameters ............................................................................................. 33

5.1.2 Processing Procedures ............................................................................ 34

5.1.2.1 L1A Geolocation ............................................................................................... 34

5.1.2.2 ATLAS Instrument ........................................................................................... 34

5.1.2.2.1 L1A processing algorithms ............................................................................... 34

5.1.2.2.2 L1A user guide notes ........................................................................................ 36

5.1.2.3 LRS Instrument ................................................................................................. 37

5.1.2.4 Spacecraft Data ................................................................................................. 38

5.2 Variance or Uncertainty of Estimates .............................................................. 39

5.3 Numerical Computation Considerations .......................................................... 39

5.3.1 Programmer/Procedural Considerations .................................................. 39

5.3.2 Calibration and Validation ........................................................................ 39

5.3.3 Quality Control and Diagnostics ............................................................... 39

6.0 DATA QUALITY AND BROWSE ........................................................................ 40

6.1 Data Quality .................................................................................................... 40

6.1.1 Packet checksum ..................................................................................... 40

6.1.1.1 Processing ......................................................................................................... 40

6.1.1.2 Quality Criteria ................................................................................................. 40

6.1.2 . Packet count .......................................................................................... 40

6.1.2.1 Processing ......................................................................................................... 40

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