00000000nam 2200000zi 4500
0019.894572
003CaOODSP
00520221107173757
006m     o  d f      
007cr bn|||||||||
008201211s1978    oncab   ob   f000 0 eng d
040 |aCaOODSP|beng|erda|cCaOODSP
0861 |aCo24-3/7-1313-1978E-PDF
1001 |aMuldrew, D. B., |eauthor.
24510|aIonospheric effects on the Doppler frequency shift in SARSAT propagation / |cby D.B. Muldrew and H.G. James.
264 1|aOttawa : |bCommunications Research Centre, |c1978.
300 |a1 online resource (iii, 43 pages) : |billustrations, map.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aCRC report ; |vno. 1313
500 |a"Radio and Radar Research Branch."
500 |a"February 1978."
500 |aDigitized edition from print [produced by Innovation, Science and Economic Development Canada].
500 |aSome pages rotated in this copy.
504 |aIncludes bibliographical references (page 14).
5203 |a"The Doppler frequency shift of signals propagating from an Emergency Locator Transmitter (ELT) on a downed aircraft up to a transponder on a search and rescue satellite (SARSAT) and down to a central station is affected by the ionosphere. In this report ionospheric effects are estimated for a proof-of-concept SARSAT experiment using the AMSAT OSCAR-6 satellite. In this case, the down link is at 30 MHz and the daytime ionosphere with no horizontal gradients in electron density can change the Doppler frequency by a few hertz. Horizontal gradients of electron density can have more effect on the Doppler frequency than the vertical distribution of density since the negative vertical density gradient in the topside ionosphere tends to compensate the Doppler effect due to the positive gradient in the bottomside. In the late afternoon, evening and nighttime, large east-west troughs in the density distribution exist which can produce shifts of a few tens of hertz at 30 MHz. The Doppler frequency shift due to the ionosphere varies approximately inversely as the frequency. The results obtained here can be applied to the definition of an operational SARSAT system"--Abstract, page 1.
530 |aIssued also in print format.
650 0|aIonospheric radio wave propagation.
650 0|aDoppler effect.
650 0|aArtificial satellites in search and rescue operations.
650 6|aOndes radioélectriques|xPropagation dans l'ionosphère.
650 6|aEffet Doppler-Fizeau.
650 6|aSatellites artificiels dans les opérations de recherche et de sauvetage.
7102 |aCommunications Research Centre (Canada), |eissuing body.
830#0|aCRC report ;|vno. 1313.|w(CaOODSP)9.882492
85640|qPDF|s1.07 MB|uhttps://publications.gc.ca/collections/collection_2020/isde-ised/Co24/Co24-3-7-1313-1978-eng.pdf