NAVSTAR/GPS/GLONASS

Question 1

5 Types of Signals

Answer 1

GPS(CA)/Commercial/Safety of life/Public regulated (Mil or P)/ Distress/

Question 2

Galileo satellite number and configuration

Answer 2

30 Satellites/ 9 Spare/ 3 Planes / 23222 Km Oribit

Question 3

Galileo Orbit Time

Answer 3

14 Hours

Question 4

Galileo Frequency Bands

Answer 4

1164 - 1215 MHZ

1559 - 1591 MHZ

Question 5

All in view

Answer 5

Tracking all satellites can instantly replace a lost signal with anothe being monitored

Question 6

Search the Sky

Answer 6

After turning on GPS searches for stored data

Question 7

NAVSTAR number of SATELITES

Answer 7

24 +1 (groups of 6)

Question 8

NAVSTAR Orbit Height

Answer 8

20200km

Question 9

NAVSTAR Coverage/config

Answer 9

6 Circular Planes 28DEG view of earthe

Question 10

Define Mask Angle

Answer 10

Lowest angle above horizon that satellite can be used

Question 11

Glonass: height

Answer 11

19100KM

Question 12

Glonass Inclination

Answer 12

64.8DEG

Question 13

Glonass Freq

Answer 13

L1 - 1.6 ghz

L2 - 1.2GHZ

Question 14

What is the PRN code used for

Answer 14

PRN is a code used for the identification of the satellites and the measurement of the time taken by the signal to reach the receiver

Question 15

Frequncy band for L1 and L2

Answer 15

UHF

Question 16

What is corrected by the transmission of the signals on two frequencies (L1 and L2)

Answer 16

Ionospheric propagation error can be minimized by comparison of the L1 and L2 frequencies

Question 17

What is Almanac Data?

Determines? `

Answer 17

Almanac data contains the position and geometry of all satellites. The receiver can determine:
Satellites functioning normally \
The PRN codes
Predicted positions

Takes 12,5 Minutes to download

Question 18

Ephemeris Data

Answer 18

Needs to be downloaded from EACH satellite (12 Seconds to download)))

Question 19

NEED A FLASH CARD FOR PRN

Question 20

Orbital heights

Answer 20

GLONASS orbits occur at 19 000 km above the WGS 84 ellipsoid whilst NAVSTAR/GPS orbits occur at 20 200km

Question 21

Orbital heights GLONASS + NAVSTAR

Answer 21

GLONASS orbits occur at 19 000 km above the WGS 84 ellipsoid whilst NAVSTAR/GPS orbits occur at 20 200km

Question 22

Which of the following geometric satellite constellations provides the most accurate NAVSTAR/GPS position fix?

Answer 22

4 satellites with an azimuth of 90° from each other and an elevation of 45° above the horizon

Question 23

Which of the following geometric satellite constellations provides the most accurate NAVSTAR/GPS position fix?

Answer 23

The most accurate GPS position fix is available from 4 satellites. 3 satellites with a 120 deg azimuth between satellites with the fourth satellite overhead the fix.