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UNIVERSITY OF COLOMBO, SRI LANKA

INSTITUTE OF HUMAN RESOURSE ADVANCEMENT

1MASTER OF SCIENCE IN GEO-INFORMATICS NO 01- GROUP A

SECOND SEMESTER EXAMINATION(Held in November/December 2013)

MSGIS 05 - GLOBAL POSITIONING SYSTEMS

Answ! ALL "#s$%&ns

(T'%s "#s$%&n ()(! *&ns%s$s &+ 0 "#s$%&ns )n 0. ()/)

I(&!$)n$ Ins$!#*$%&ns $& C)n%)$s

If a page or a part of this qestion paper is not printed! please inform the spervisor

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#ns$er all qestions %ime allocated .'!

&nter 'or Inde Nmber (as in admission) on all pages of the ans$er script

*sing +alclators are allo$ed

1.

a. What are the presently available satellites based positioning

and navigation systems? (15 marks)b. What are the three main segments of GPS system? (10 marks). !"plain eah of above in detail (#0 marks)d. $ist three main %ses of GPS and e"plain eah of them &ith a

pratial e"ample. (15 ' #0 marks)

.a. $ist the main %se of eah signals (types) transmits by a GPS

satellite (0 marks)

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b. What are e"peted f%t%re modiations for present GPS signal

str%t%re? (0 marks). !"plain* &hy +$1, arrier based range meas%rements are

more a%rate than the +-/, ode based range

meas%rements? (#0 marks)d. riey e"plain* &hy minim%m of 2 satellites are re3%ired for

a%rate positioning? (#0 marks)

#.a. $ist ve (5) di4erent so%res of GPS positional errors (10

marks)b. riey e"plain any three (#) error so%res listed above (#0

marks). riey e"plain* &hy an error al&ays assoiated &ith the range

meas%rement to eah satellite? (#0 marks)d. riey e"plain* &hat is i4erential GPS (GPS) tehni3%e? (#0

marks)

2.a. $ogially 6%stify yo%r agreement or disagreement of the

follo&ing statements (eah 50 marks)i. +7he ontrol segment of the GPS system has e3%al

importane in preise positioning &hen ompared to the

spae and %ser segments,ii. +7he seletion of a GPS reeiver type for a map %pdating

pro6et is depending &ith the sale and the re3%ired

a%ray of the map,

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