(HP-67) SeaSat Equator Crossing Program

[SlideRule]

An extract from SeaSat Equator Crossing Program, Dept. National Defense (Canada), R&D Branch, Technical Note No. 80-19, JUN 1980

ABSTRACT
A programmable pocket calculator is used to extrapolate the SEASAT orbit from the equator crossing to the position at which the synthetic aperture radar images a given target. The program predicts the coordinates of the satellite at image time, the Azimuth direction of the image at the target, and the time elapsed between equator crossing and imaging. Program predictions are compared with measured SEASAT data from the definitive attitude-orbit files.
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TABLE OF CONTENTS…
3.0 THE CALCULATOR PROGRAM
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1.0 INTRODUCTION
SEASAT Equator Crosstng is a program for the HP-67 hand calculator to predict when a given target will be imaged by the SEASAT synthetic aperture radar (SAR) and from what direction.
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3.0 THE CALCULATOR PROGRAM
Instructions for entering the program and the data are given in Table II. The program itself is listed in Table III for the ascending leg and in Table !V for the descending leg.
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6.0 CONCLUSIONS
1. A program for the HP-67 programmable pocket calculator to extrapolate the SEASAT ground track up to one quarter of a revolution beyond the node has been developed and tested.

Replete w/ equations, diagrams etc.

BEST!
SlideRule

ps: also available at DTIC ADA099442: SEASAT Equator Crossing Program.