Glossary of NEETS MOD 18 ASSIGNMENT 1
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- Radar surface-angular measurements are referenced to true north and measured in what plane?
- Horizontal plane.
- The distance from a radar set to a target measured along the line of sight is identified by what
- What is the speed of electromagnetic energy traveling through air?
- Approximately the speed of light (162,000 nautical miles per second).
- How much time is required for electromagnetic energy to travel 1 nautical mile and return to the
- 12.36 microseconds.
- In addition to recovery time, what determines the minimum range of a radar set?
- Pulse width.
- Atmospheric interference with the travel of electromagnetic energy increases with what rf energy characteristic?
- How is prt related to prf?
- 1/PRT= PRF
- What type of radar transmitter power is measured over a period of time?
- Average power.
- What term is used to describe the product of pulse width and pulse-repetition frequency?
- Duty cycle.
- What type of target bearing is referenced to your ship?
- Relative bearing.
- What type of radar detects range, bearing, and height?
- What characteristic(s) of radiated energy is (are) altered to achieve electronic scanning?
- Frequency or phase.
- What term is used to describe the ability of a radar system to distinguish between targets that are close together?
- Target resolution.
- The degree of bearing resolution for a given radar system depends on what two factors?
- Beam width and range.
- What happens to the speed of electromagnetic energy traveling through air as the altitude
- Speed increases.
- What term is used to describe a situation in which Atmospheric temperature first increases with altitude and then begins to decrease?
- Temperature inversion.
- What radar subsystem supplies timing signals to coordinate the operation of the complete
- When a transmitter uses a high-power oscillator to produce the output pulse, what switches the oscillator on and off?
- High-voltage pulse from the modulator.
- What radar component permits the use of a single antenna for both transmitting and receiving?
- What is the simplest type of scanning?
- Single lobe.
- How does the operator of a single-lobe scanning system determine when the target moves off the lobe axis?
- The reflected signals decrease in strength.
- What are the two basic methods of scanning?
- Mechanical and electronic.
- Rotation of an rf-feed source to produce a conical scan pattern is identified by what term?
- The Doppler effect causes a change in what aspect of rf energy that strikes a moving object?
- The Doppler variation is directly proportional to what radar contact characteristic?
- The Doppler method of object detection is best for what type objects?
- Fast-moving targets.
- The beat frequency in a swept-frequency transmitter provides what contact information?
- What factor determines the difference between the transmitted frequency and the received frequency in an fm transmitter?
- Travel time.
- What type of objects are most easily detected by an fm system?
- What transmission method does NOT depend on relative frequency or target motion?
- Pulse modulation.
- What transmission method uses a stable cw reference oscillator, which is locked in phase with the transmitter frequency?
- What type of radar provides continuous range, bearing, and elevation data on an object?
- Track radar.
- Radar altimeters use what type of transmission signal?
- Frequency modulated (fm).
- A surface-search radar normally scans how many degrees of azimuth?
- 360 degrees.
- What limits the maximum range of a surface-search radar?
- Radar horizon.
- What is the shape of the beam of a surface-search radar?
- Wide vertically, narrow horizontally.
- Air-search radar is divided into what two basic categories?
- 2D and 3D.
- What position data are supplied by 2D search radar?
- Range and bearing.
- Why do 2D air-search radars use relatively low carrier frequencies and low pulse-repetition rates?
- Increased maximum range.
- Why is the range capability of 3D radar usually less than the range of 2D radar?
- Higher operating frequency.
- Fire-control tracking radar most often radiates what type of beam?
- A narrow circular beam.
- Tracking radar searches a small volume of space during which phase of operation?
- What width is the pulse radiated by fire-control tracking radar?
- Very narrow.
- Which beam of missile-guidance radar is very wide?
- Capture beam.
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