Radar

How fast does electromagnetic energy travel

186,000 mps or 162,000 Nps or 984 ft per microsecond

Air search radar is divided into what two basic categories

2D and 3D

A surface search radar normally scans how many degrees of azimuth

360 degrees

How many king does it take for energy to travel one mile

6.18 micro seconds. Two way travel makes it 12.36 microseconds

Fire control radar most often radiates what type of beam

A narrow circular beam

Tracking radar searches a small volume of space during with phase of operation

Acquisition

What type of radar transmitter power is measured over a period of time

Average power

The degree of bearing resolution for a given radar system depends on what two factors

Beam width and range

Witch beam of middle guidance radar is very wide

Capture beam

What radar components permits the use of a single antenna for both transmitting and receiving

Duplexer

What term is used to describe the product of pulse width and pulse repetition frequency

Duty cycle

The Doppler method of object detection is best for what type of objects

Fast moving targets

The Doppler effect causes a change in what aspect of rf energy that strikes a moving object

Frequency

Radar altimeters use what type of transmission signal

Frequency modulation

What characteristic of radiated energy is altered to achieve electronic scanning

Frequency or phase

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

Why is the range capability of a 3D radar usually less then the 2D

Higher frequency

Radar surface angular measurements are referenced to true north and measured in what plane

Horizontal plane

Why do 2D air search radars use relatively low carrier frequencies and low pulse repetition rates

Increased max range

Long range coverage is better at what frequencies

Low frequencies because it is less affected by atmosphere

What are the two basic methods of scanning

Mechanical and electronic

Rotation of an rf fed source to produce a conical scan pattern is identified by what term

Nutation

What transmission method uses a stable cw reference oscillator, which is locked in phase with the transmitter frequency

Pulse doppler

What transmission method does not depend on relative frequency or target motion

Pulse modulation

What determines the minimum range

Pulse width

What limits the max range of a surface search radar

Radar horizon

What does radar stand for

Radio detection and ranging

The beat frequency in a swept frequency transmitter provides what contact information

Range

The distance from a radar set to a target measured along the line of sight is called what

Range

What position data are supplied by 2D search radar

Range and bearing

What type of target bearing is referenced to ur ship

Relative bearing

What is the simplest type of scanning

Single lobe

What happens to the speed of electromagnetic energy traveling through air as the altitude increases

Speed increases

What type of objects are most easily detected by an fm system

Stationary

What radar subsystem supplies timing signals to coordinate the operation of the complete system

Synchronizer

What term is used to describe the ability of a radar system to distinguish between targets that are close together

Target resolution

What term is used to describe a situation in which atmospheric tempature first increases with altitude then begins to decrease

Temperature inversion

How does the operator of a single love scanning system determine when the target moves off the lobe axis

The reflected signal decrease in strength

What type of radar detects range, bearing, and height

Three demensional

What type of radar provides continuous range bearing and elevation data on an object

Track radar

What factor determines the difference between the transmitted frequency and the recieved frequency in an fm transmitter

Travel time

The Doppler variation is directly proportional to what radar contact characteristic

Velocity

What width is the pulse radiated by fire control tracking radar

Very narrow

What is the shape of the beam of a surface search radar

Wide vertically narrow horizontally