אלגוריתמי ניווט ושיערוך מיקום

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Presentation transcript:

אלגוריתמי ניווט ושיערוך מיקום הרצאה 3: GNSS מרצים: פרופסור בועז בן משה רועי יוזביץ

History: 4, October, 1957

Triangulation vs Triatulation

“It’s worse than a crime. It’s a mistake” [Joseph Fouche]

TOA

DOP

Sphere Intersection (2 solutions…)

השיטה של בועז

PseudoRange Equations השיטה הנכונה PseudoRange Equations

Taylor Series 65 =? 1685-1731

Selective Availability

In Depth look

C/A Code

FFT Search Space

Multipath Phenomena

Urban Canyons multipath

Map Matching/ Dead Reckoning

The Receiver worked “good”

Cordinate Systems: ECEF Lattitude/Longtitude Universal Transverse Mercator (UTM)

ECEF (WGS-84)

Lat/Lon

Intermezzo 1693-1776

UTM

GNSS Velocity Computation Satellite Doppler Shift:

𝑣 𝑑 = 𝑣 𝑠 ∙𝑠𝑖𝑛𝛽;

GNSS Protocols: NMEA (Textual) Binary (Sirf, Rinex) Propriety NMEA (ST-Micro) Android API (LAT/LON, COG/SOG)

Other Kinds Of GNSS A-GPS (Cellular) D-DGPS Real Time Kinematics (RTK)

D-GPS (what is ppm?) 1 ppm – 1cm of accuracy for every 10km distance from the base-station.