Accession Number : AD0652804

Title :   SOME FACTORS AFFECTING THE CORRECTION OF IONOSPHERIC REFRACTION ERRORS IN TRANSIT DOPPLER DATA.

Descriptive Note : Technical rept.,

Corporate Author : TEXAS UNIV AT AUSTIN DEFENSE RESEARCH LAB

Personal Author(s) : Wright, Julian R.

Report Date : 28 NOV 1961

Pagination or Media Count : 13

Abstract : It is present practice to eliminate 'first order' refraction effects from TRANSIT doppler data by using the doppler shifts at two frequencies. If an effort is made to correct higher order refraction errors by using doppler shifts at three or four frequencies, the effect of errors other than those caused by refraction is increased. It is shown that these other errors must be decreased before higher order refraction correction is useful. It is further pointed out that the erratic errors which constitute a bar to further refraction correction are useful as a measure of other types of system error. Reduction of these erratic errors constitutes a simple criterion of improved system performance. (Author)

Descriptors :   (*DOPPLER NAVIGATION, DOPPLER SYSTEMS), (*NAVIGATION SATELLITES, DOPPLER NAVIGATION), CORRECTIONS, ERRORS, REFRACTION, IONOSPHERIC PROPAGATION, PHASE.

Subject Categories : Radiofrequency Wave Propagation
      Navigation and Guidance
      Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE