Radar Flashcards
What does radar stand for
Radio Detection and Ranging
How does Radar work
On the “echo principle”
What does radar do once it transmits
Goes into receive mode.
What is a radar nautical mile
80,915 NM out in one second (161,830 miles per sec) remember
What is signal attenuation
absorption or loss of power
X band radar
3cm Radar short range
S Band
10 cm radar long range
What is the PRR
Number of pulses transmits in one second (pulse repetition rate)
Pulse length
main factor in determining minimum measurable range
Travels 328 yards in one microsec
What is resting time
time elapsed between the end of the first transmission and beginning of the second transmission measured in microseconds
What two factors are in PRR
Pulse rate and resting time
How many times it happens in one second is the PRR
Also prt
What is the main factor in maximum effective range
PRR
What is the main factor in determining minimum measurable range
PL pulse length
Where do you want to put the VRM when measuring distance
inside leading edge or spot closest to you
6/1
Range 6 miles, each ring 1 NM
What is the best way to fix posititon by Radar
two or more ranges
How is pulse length measured
miroseconds
What does PL determine
minimum measurable range
What does PRR determine
Maximum measurable range
What is bearing resolution
ability of the radar to distinguish as two separate targets at the same range but at different bearings
What is the primary value of PI lines
early warning for set and drift
Why is it not acceptable to fix position using floating aids?
Because buoys are not in a fixed position and may be off station enough to cause problems
How many logs does each Radar need
x2 maintenance and performance log
What does the performance log list
type, make and model radar
Idiosyncrasy
