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Author:Salminen, Tommi
Title:Dilution of Precision in Pulsar Navigation
Dilution of Precision pulsarinavigoinnissa
Publication type:Master's thesis
Publication year:2014
Pages:vii + 51 s. + liitt. 4      Language:   eng
Department/School:Sähkötekniikan ja automaation laitos
Main subject:Älykkäät tuotteet   (ETA3006)
Supervisor:Kyrki, Ville
Instructor:Kestilä, Antti
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201501031002
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  2677   | Archive
Keywords:pulsar
navigation
DOP
dilution
precision
pulsari
navigointi
Abstract (eng):Pulsars are rotating neutron stars that emit electromagnetic radiation and can spin around themselves up to hundreds of times per second.
The stability of the radiation pulse's period matches that of atomic clocks, making pulsars reliable beacons in space.

Both the properties of an individual pulsar and the geometry between observed pulsars affect the accuracy of a navigation solution.
The accuracy is described with a measure called dilution of precision (DOP).

The objective of this thesis is to find the pulsars that are optimally suited for navigation while observing them on radio frequencies.
The presented solution is a list of sets of three pulsars, ranked by their DOP values.
Abstract (fin):Pulsarit ovat neutronitähtiä, jotka pyörivät itsensä ympäri parhaimmillaan satoja kertoja sekunnissa lähettäen samalla sähkömagneettista säteilyä.
Havaitun säteilyn periodi vetää tasaisuudessaan vertoja atomikelloille ja tekee pulsareista siten avaruuden majakoita, joiden avulla voi navigoida.

Navigoinnin tarkkuuteen vaikuttavat sekä yksittäisen pulsarin ominaisuudet, että käytettyjen pulsarien välinen geometria.
Tarkkuutta kuvataan "dilution of precision" (DOP) -nimisellä suureella.

Tämän diplomityön tavoitteena on selvittää, mitkä pulsarit ovat kaikkein parhaita käytettäväksi navigoinnissa, kun niitä kuunnellaan radiotaajuuksilla.
Ongelma on ratkaistu luomalla lista eri pulsariyhdistelmistä ja laskemalla, millä yhdistelmällä on kaikkein pienin DOP-arvo.
ED:2015-01-18
INSSI record number: 50388
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