SEW Detection and Analysis (FDOA)

Question 1

Describe FDOA

Answer 1

Difference in frequency due to the doppler effect of signals traveling from the Primary and Adjacent satellites

Question 2

Describe TDOA

Answer 2

Pathlength differenc as the signal travels through the Primary and Adjacent satellites

Question 3

What is the Doppler Effect?

Answer 3

Difference in expansion and compression of a wave, relative to an observer

Question 4

What is required for Geolocation?

Answer 4

• Geo antennas must be in the downlink footprint
• Knowledge of ephemeris
• Reference emitters with precisely known location

Limitation - Geolocation not guaranteed