Radar/Tracking

Question 1

Pulse Duration

Answer 1

Time that the radar set is transmitting RF energy

Question 2

Pulse Repetition Frequency

Answer 2

The number of pulses per second that rdr transmits

Question 3

Pulse Repetition Interval

Answer 3

Time required for a complete transmission cycle

Question 4

Signal Strength

Answer 4

Signal or echo that is received when a pulse is reflected from target

Question 5

Radar mile

Answer 5

distance that a radar pulse travels in 12.4 microsecs

Question 6

Beam width

Answer 6

Distance in degrees between the half power points

Question 7

Scan Duration

Answer 7

Time required for one complete scan, or cycle of the antenna

Question 8

Range Resolution

Answer 8

Ability of the radar to separate two tgts close in range at apprx same azimuth

Question 9

Minimum range

Answer 9

Shortest range at which a target may accurately be displayed on radar

Question 10

Maximum theoretical range

Answer 10

Range from which an echo can return before the next succeeding pulse is tx

Question 11

Gain

Answer 11

Ability of an antenna to concentrate its radiated energy in a particular direction

Question 12

Chirping

Answer 12

Method of pulse coding that increases range resolution while keeping long range detection capability

Question 13

Azimuth resolution

Answer 13

Ability of a radar to separate two targets close in azimuth at aprx same range

Question 14

Which parameters affect the range resolution of a radar

Answer 14

Pulse Duration

Question 15

Which parameters affect maximum theoretical range

Answer 15

PRF/PRI

Question 16

Which parameter affects azimuth resolution

Answer 16

Beamwidth

Question 17

Which parameters affect rate at which data might be collected on target?

Answer 17

PRF/PRI, scan duration, beamwidth

Question 18

How are EW radars best described

Answer 18

360 search provide range and azimuth info on targets at all altitudes w/in 200 nm or more.

Question 19

What kind of scan, pulse width and beam do EW radars normally use?

Answer 19

Circular scan, long pulse width, narrow, vertical fan shaped beam

Question 20

HF radars usually use what kind of scan/

Answer 20

Vertical sector scan

Question 21

HF radars typically use an operating frequency in which frequency range?

Answer 21

2000-10000 MHz

Question 22

Compared to EW radars, acquisition radars typically have:

Answer 22

shorter pw, higher prf and narrower beam widths but have circular scans.

Question 23

What are the usual power and PRF characteristics of acquistion radars

Answer 23

lower power due to increased range resolution / higher PRF

Question 24

What type of beams does a V beam radar at a GCI site have?

Answer 24

vertical and slant

Question 25

GCI radars provide what info?

Answer 25

range, azimuth and altitude

Question 26

TT radars in general used what type of PW and beam width?

Answer 26

short pw, narrow beam width

Question 27

What type of information is normally provided by target illuminator radars

Answer 27

cont illumination of tgt

Question 28

MG radars normally use what type of scan

Answer 28

steady

Question 29

The direct threat radar that provides the most accurate info for missiles is what

Answer 29

Missile guidance

Question 30

Using each echo pulse from the tgt to determine a new azimuth and elevation correction signal is the def of what type of radar?

Answer 30

Monopulse

Question 31

Using 2 narrow beams, each pointing slightly off antenna boresight is the def of what ?

Answer 31

Sequential lobing

Question 32

Continuously rotating an offset antenna beam is the def of what

Answer 32

conical scan

Question 33

If a lobe on receive only mode of operation is used with a conical scan radar, the radar is called what

Answer 33

Conical scan on receive only COSRO

Question 34

What is the mode of transmitting on one antenna that does not scan and receiving on another antenna that scans called?

Answer 34

Lobe on Receive only

Question 35

If a lobe on receive only mode of operation is used w/a track while scan radar, the radar is called what?

Answer 35

Track while scan on receive only TWSRO

Question 36

What type of radar used calculations based on the freq difference between the transmitted pulse and the received echo?

Answer 36

Pulse Doppler

Question 37

Using 2 sep beams and 2 sep antennas on two diff freqs with one scanning in elevation and other scanning in horizontal is the def of what?

Answer 37

TWS