Transcript GPS NAVIGATION

GPS NAVIGATION
INTRODUCTION
NAVIGATION
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BEARINGS
ECHO SOUNDING/LEAD LINE
ASTRO NAVIGATION
VSA & HSA
DOUBLING THE ANGLE OF THE BOW
ELECTRONIC NAV
• R.A.D.A.R.
• RDF (ROTATIONAL ANTENNA) INERFERENCE, PARALAX
• HYPERBOLIC SYSTEMS (WW2)
– DECCA (MASTER, 3 SLAVES) MEASURES
TIME/PHASE DIFFERENCE, ACCURATE
STARTING POSN ESSENTIAL 30M
– LORAN C 300M, 700NM
– OMEGA/CONSUL
SAT NAV SYSTEMS
• TRANSIT - DOPPLER, 6 SATELLITES
ON POLAR ORBITS, TIME DELAYS,
INTO REDUNDANCY
• NAVSTAR
• HF FX - LITTLE INTERFERENCE
• CONSTANLY 4 VISIBLE - 3 NEEDED
FOR 2 DIMENSIONAL WORK.
• SA REMOVED LAST YEAR BUT
COULD BE RE-INTRODUCED AT ANY
TIME
• HAND HELD, FIXED, ECDIS,
INTERFACING - SOG, COG, XTD.
• SINGLE OR MULTIPLE CHANNEL OR
DIFFERENTIAL - DIAGHRAM 5 M OR
TO MM ACCURACEY , TRACKING,
DUB CORP, FORRESTRY, MIZEN
INITIAL PROGRAMMING
• ON/OFF - DATE, UTC (ATOMIC
BARIUM, CEASIUM - SET YOUR
WATCH BY IT), LMT (Zulu or alpha VAL ALWAYS UTC),
• POSITION OF ANTENNA,
• ENTER HEIGHT OF ANTENNA
• APPROX LAT LONG.
• MAG VAR (7* w) CDMVT (AUTO?)
– 050
-7
043T
• STEERING BY T OR M?
• IGNORE DEVIATION
• SET SI’S TO NM & KNOTS, HEIGHT
AND DEPTH TO METRES.
• ALARMS - WP, XTD
OUTPUTS
• LAT, LONG
• XTD, SOG, COG (GS) m or true, DTR
• ETA, TTG, VMG, DMG, CTD, DTG, SET,
DRIFT. SET DISTANCES FOR RHUMB
LINE.
• MOB - AUTO DDG AND CTS
WAYPOINTS
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WHAT IS A WAYPOINT
NUMBERING/NAMING
TAKING OFF CHARTS
LEAD IN TO HARBOUR - NOT A
CHART WILL LEAD YOU AGROUND
• WAYPOINT LIBRARY
• GO TO FUNCTION - WP NO OR CHART
DISPLAYS AVAILABLE
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ROADWAY - BULLSEYE
STEERING NEEDLE
ALARMS
XTE, DTG, SOG, COG, CTS
DEFENSIVE NAVIGATION ==+++
CROSS CHECK GPS WITH MK 1
EYEBALL
• ROUTEING - lay out plan, dist. brg
between each WP
• SEARCH BOXES
• GO TO, DRAW HISTORY O N OR 1’ X 1’
X 2’ X 2’, ETC OR TIMED.
LAND NAVIGATION
• E.G. POSITION OF CASUALTY
FOLLOWING CONTOURS AROUND
LAKES, FOG, Marking evidence, altitude.
ERRORS
• CHART DATUMS - WGS 84,
CORRECTIONS FROM OSGB, ED FOR
CHART OR SELECT RIGHT DATUM
• SA
• CHART ERRORS
• USER ERRORS
• SATELLITE EXCLUSION - MSC OUT OF
CONTACT WITH SATS FOR 6 HRS.
• GDOP - GEOMETRY OF SATELLITES, CUTS,
100M 95% ACCURACY
• IONOSPHERIC AND ATMOSPHERIC DELAYS
• CLOCK ERRORS
• MULTIPATH ERRORS - GHOSTING ON TV
• EPHEMERIS ERROR
• TOTAL ERRORS X PDOP (4-6) = HDOP =
120M WORST CASE