Introduction to Radar Systems
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1. What uses radio waves to detect the presence of a target?
1. Radio Waves.
2. Radar transmits radio frequencies to determine what?
- - Range
- - Bearing
- - Height (Elevation)
- - Speed
3. Basic Radar system consists of what 4 items?
- - Transmitter
- - Antenna
- - Receiver
- - Master Timer
4. What calculates time of echo (EM energy) to return to receiver?
5. Range requires what three ranges?
5. Maximum, Minimum, Range Resolution.
6. What is the maximum distance EM energy will return to receiver?
6. Maximum Range.
7. What is the minimum distance needed for transmitter to switch to receiver?
7. Minimum Range.
8. What is the minimum range interval between targets needed to distinguish individual targets?
8. Range Resolution.
9. What is the minimum separation to see two targets?
9. Azimuth Resolution.
10. Reflection is called what?
11. Object interrupting RF Energy is what?
12. Presence of echo indicates what?
12. Detection of object.
13. When object detected is desired target, echo is referred to as what?
13. Target Signal.
14. When echo from undesired object echoes, it is referred to as what?
15. What determines a radar’s range resolution?
15. The pulse width or pulse duration.
16. What determines a radar's elevation resolution?
16. The Vertical beamwidth.
17. What determines a radar’s azimuth resolution?
17. The horizontal beamwidth.
18. What is a change in the apparent frequency of a wave as observer and source move toward or away from each other?
18. Doppler Effect.
19. What takes advantage of the fact that the frequency of RF waves will be changed or shifted when reflected from a target moving relative to the radar?
19. Doppler Effect.
20. What are the five main Radar Components?
- - Transmitter
- - Duplexer
- - Receiver
- - antenna
- - Display
21. What sends RF energy to space?
22. What is a passive switch between the transmitter and receiver?
23. What collects RF "Echo"?
24. What focuses/directs RF energy?
25. What is the operator interface?
26. Primary Antenna types fall into what three categories?
- - Parabolic
- - Cassegrain
- - Phased Array Antennas
27. What are the two Radar types?
27. Pulsed and Continuous Wave.
28. Which antenna uses two-reflector system to generate and focus radar beam?
28. Cassegrain Antenna.
29. Where most of the radar’s energy is focused is called what?
30. A ratio of the radars on and off time is what?
30. Duty Cycle.
31. Which radar type transmits pulses of EM enery?
31. Pulse Radar.
32. Which radar type transmits continuous EM energy?
32. Continuous Wave.
33. What is the beginning of one pulse to the beginning of the next pulse?
33. Pulse Repitition Interval.
34. What is the number of pulses per second the radar transmits?
34. Pulse Repition Frequency.
35. Main lobe is where radar has ____ _____ and where target detection usually occurs.
35. Most Power.
36. Which scan uses an antenna system that continuously scans 360 degrees in azimuth?
36. Circular Scan.
37. Which scan does back and forth scanning?
37. Sector Scan.
38. Which scan pattern is commonly used as a target acquisition mode ofr radar systems?
38. Helical Scan.
39. Which scan sweeps both vertically and horizontally?
39. Raster Scan.
40. Which scan is generally used for precision target tracking and employs a pencil beam of radar energy that continuously rotated around the target?
40. Conical Scan.
41. Which scan is both a Conical and Helical scan?
41. Palmer Scan.
42. Which scan is the combination of conical scan and raster scan?
42. Palmer-Raster Scan.
43. Which scan is among the most complex radar systems, and from a single pulse it can derive all the data needed to update a target's position?
43. Monopulse Scan.
44. Which scan has a radar which employs two antennas that work with each other to perform a scan function?
44. Track-while-Scan (TWS).
45. What is the maximum range a radar system can detect a target due to the curvature of the earth?
45. Radar Horizon.
46. What are the four common Missile Guidance radar applications?
- - Command Guidance
- - Semi-Active Guidance
- - Active Guidance
- - Passive Guidance
47. A guidance type in which the missile contains its own miniature radar onboard?
47. Active Guidance.
48. A guidance type that has a receiver and needs a separate radar to illuminate the target?
48. Semi-Active Guidance.
49. A phased array radar that can be integrated with the Patriot or other missile defense systems?
50. What uses a passed array antenna to provide guidance to the Patriot MIM-104?
50. AN/MPQ-53 and AN/MPQ-65 radar.
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