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VT

ACI-042281-F

(NASA-CR-161754) RESEARCH STUDY: STS-1N81-23763ORBITER DESCENT Final Report (Atsuko

Cosputinq International) 45 p HC 1103/11F A01

CSCL 04B jm-,QUnclas

W/47 42255

RESEARCH STUDY: STS-1 ORBITEF DESCENTr

FINAL REPORT

1

Prepared for:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION

GEORGE C. MARSHALL SPACE FLIGHT CENTER

MARSHALL SPACE FLIGHT CENTER, ALABAMA 35812

Attention:

AP29-F/Edward M. Harper

Under Contract:

NASB-34334

Prepared by:r^lQ 223 4^s^^^

YJohn S. Hickey

April 22, 1981^/^^ g Lg^^

ATSUKO COMPUTING INTERNATIONAL

HUNTSVILLE, ALABAMA • USA

PREFACE

This is the Final Report prepared by Atsuko Computing International (ACI), under Contract NAS8-34334, entitled "Research Study: STS-1 Orbiter Descent", for the Space Sciences Laboratory of Marshall Space Flight Center. The NASA technical monitor for this contract is Dr. Robert E. Turner.

Prepared By:

-'^lS. jJohn S. Hickey

ATSUKO COMPUTING INTERNATIONAL

HUNTSVILLE, ALABAMA • USAQ@0

ABSTRACT

This report describes the data reduction software developed by ACI to reduce the STS-1 radiosonde data. A group of four programs have been devel- oped and implemented on the REEDA System (HP-1000 Series F minicomputer run- ning under RTE-IVB 0/S). These programs were utilized to process the raw STS-

1 radiosonde data and generate tabulated first difference, contract data, 30

second data, and graphical plot data tapes.

ATSUKO COMPUTING INTERNATIONAL

HUNTSVILLE, ALABAMA - USA 'QeD

TABLE OF CONTENTS

SectionPage

1INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . 1

2TECHNICAL . . . . . . . . . . . . . . . . . . . . . . . . 2

3PROGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . 3

APPENDIX

ASTS-1 SOUNDING

BPROGRAM STS01(13t DIFFERENCE)

CPROGRAM STS02 -- (CONTACT DATA)

DPROGRAM STS03 -- (PLOT DATA)

EPROGRAM STSO4 -- (30 SECOND DATA)

ATSUKO COMPUTING INTERNATIONAL

HUNTSVILLE, ALABAMA • USAQeu

I r1. INTRODUCTION Atsuko Computing International (ACI), is pleased to submit this Final Report under Contract NAS8-34334, entitled "Research Study: STS-1 Orbiter

Descent".

The objective of this project was to convert existing AVE-SESAME Con- tact programs to the REEDA System and to reduce various STS-1 radiosonde data. A sequence of events was performed by ACI during this contract to accomplish the above objective: o Converted the AVE-SESAME C- - .act Program (IBM) to the REEDA System. o Reduced all STS-1 radiosonde releases at selected sites to obtain atmospheric parameters of thermodynamic quantities and winds just before and after the Orbiter penetrates the landing area. o Generated a data book which provided a preliminary look at condi- tions during the STS-1 Orbiter descent, containing contact data, 30 seconds data and graphical profiles utilizing the reduced radiosonde data. r I

ATSUKO COMPUTING INTERNATIONAL

HUNTSVILLE, ALABAMA • USA

i

ATSUKO COMPUTING INTERNATIONAL

HUNTSVILLE, ALABAMA • USA@90

2. TECHNICAL

ACI converted the an AVE-SESAME Contact Program which existed on the IBM

360 to the REEDA System. This contact program processes raw radiosonde

soundings and computes at each pressure contact the thermodynamic quantites and interpolates the winds to each contact as described below:

A. Contact Data

Contact vs Time, Min.

Height, GPM

Pressure, MB

Temp oC

Dew Point oC

Wind Direction, Deg

Wind Speed, m3-1

U Comp., m3-1

V Comp., m3-1

}Pot Temp, OK

E Pot Temp, OK

Mixing Ratio, GM/KG

Relative Humidity, %

}Range, KM

Azimuth, Deg

After the Contact Program was converted on the REEDA System and verified as operational, it was then modified to process the raw data at each 30 seconds and generate the following:

B. 30 Second Data

Time vs Pressure, MB

Temp oC

Dew Point oC

Vert. Temp, oC

Temp. OK

Rel. Humidity, x

Wind Direction, Deg

Wind Speed, ms-1

Altitude, km

2 t

Altitude va Pressure, MB

Dew Point o C

Vert. Temp, oC

Temp. OK

Rol. Humidity;

Wind Direction. Deg

Wind Speed, m3-1

Time, Min.

To further enhance the capability of depicting the reduced data, exist- ing REEDA System software was modified to produce graphical profile plot tapes of the following:

C. Reduced Data (Plotted)

Altitude vs Temp oC

Dew Point oC

Wind Speed, ms-1

Wind Direction, Deg

Once the AVE-SESAME Contact Program and additional REEDA System soft- ware was modified, ACI utilized the software to reduce all radiosonde releases (as provided by MSFC) and generate the previously described outputs (A, B, C). ACI then incorporate, into a data book, the reduced radiosonde data for each release. This data book provide3 for a preliminary look at conditions during the Orbiter descent.

ATSUKO COMPUTING INTERNATIONAL

HUNTSVILLE, ALABAMA • USAQeD3

Q@0ATSUKO COMPOTING INTERNATIONAL

HUNTSVILLE, ALABAMA • USA

3. PROGRAMS

ACI developed four programs under this contract to satisfy the object- ives of processing the STS-1 raw radiosonde data. The following four programs are currently operational on the REEDA System: o STS01-- 13t Difference Program o STS02Contact Data Program o STS03Plot Data Program c STSO4 -- 30 Second Data Program ACI utilized the above programs to process the following six radiosonde soundings in support of the STS-1 launch: 'o ST1234 -- 1234GMT, April 12, 1981, Wheeler, CA o ST1330 -- 1330GMT, April 12, 1981, Tehachapi, CA o ST15351535GMT, April 14, 1981, Wheeler, CA o ST1541 -- 1541GMT, April 14, 1981, Tehachapi, CA o ST1815 -- 1815GMT, April 14, 1981, Wheeler, CA o ST1818 -- 1818GMT, April 14, 1981, Tehachapi, CA A data book was generated incorporating the outputs produced by using programs STS01-STSO4 to process all six STS-1 soundings. The appendix of this report contains an example output of each of the STS01-STSO4 programs. This report does not include a source listing of the STS01-STSO4 pro- grams (over 3000 lines of FORTRAN IV code), but can be made available upon request. 4 i i i i I Y

APPENDIX A

ATSUKO COMPUTING INTERNATIONAL

HUNTSVILLE, ALABAMA • USA

r iAPPENDIX A: STS-1 SOUNDING iThis appendix provides, as an example, the vaw sounding data for Wheeler

IRidge, California. 1234GMT, April 12, 1981.

ATSUKO COMPUTING INTERNATIONAL

HUNTSVILLE. ALABAMA • USAQau

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