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Hooyer (1) > Radar > Flashcards

Radar Flashcards

1
Q

What does radar stand for?

A

Radio detection and ranging

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2
Q

How does the radar work?

A

It uses echo principle

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3
Q

Pulse modulation

A

Determines the distance to a target by measuring the time required for an extremely short burst of radio frequency (r-f) to travel to the target and return. Direction antennas to determine the bearing.

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4
Q

X-band radar

A

3cm @ 9300-9500 mhz

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5
Q

S-band radar

A

10cm @ 2500-3100 mhz

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6
Q

Radio frequency travels at what speed?

A

Speed of light. 162,000nm per second

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7
Q

Speed of pulse radio frequency is so fast it can travel how fast in one second?

A

It can circumnavigate the globe 7 times in one second.

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8
Q

Micro send=

A

1 millionth of a second(1,000,000 microseconds in a second)

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9
Q

Cycle=

A

A complete oscillation or complete wave passing zero in one direction and zero again in the same direction.

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10
Q

Frequency

A

Number of cycles completed per second

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11
Q

One hertz =

A

1 cycle per second

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12
Q

Kilohertz

A

1,000 cycles per second

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13
Q

Wavelength

A

The distance along the direction of propogationbetween successive crests

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14
Q

Watts

A

Inversely proportional to square distance. Power at 3 miles is 1/9th power at 1 mile.

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15
Q

Voltage

A

Voltage at 2 miles is only 1/2 the voltage at 1 nautical mile.

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16
Q

Horizontal beam width

A

Narrow 0.65 degrees to 2 degrees

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17
Q

Vertical beam width

A

Broad 15-30 degrees

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18
Q

Maxima

A

When direct and indirect waves are exactly in phase

19
Q

Minima

A

When direct and indirect waves are in opposition.

20
Q

Defraction

A

Bending of a wave

21
Q

Wavelength formula for 3cm radar•

A

D=1.22 square/h
D= distance to radar horizon in nautical miles
H=height of radar

22
Q

Attenuation

A

The reduction of intensity of the wave along its path. Greater at high frequencies and shorter at wavelengths. S-band (10cm) will suffer from less attenuation than x-band(3cm)

23
Q

What will suffer more from attenuation?

A

X-band(3cm)

24
Q

Rain squalls have more affect on which radar?

A

X-band(3cm)

25
Q

What radar is better in the rain?

A

S-band (10cm)

26
Q

Clouds/water droplets are picked up better on which radar?

A

S-band(10cm)

27
Q

Pulse repetition frequency

A

The majority of radars operate on 400-4000 pulses per second

28
Q

Lowering the gain setting

A

The maximum detection range is reduced but the narrower effective bean width provides better range detection

29
Q

What radar is better in the rain?

A

S-band(10cm)

30
Q

North up on the radar is

A

Stabalized display

31
Q

Stabalized display on the radar is

A

North up on the radar

32
Q

Heads up on the radar is

A

Unstabilized display

33
Q

Unstabilized display is

A

Heads up display

34
Q

Rain clutter

A

Variable fast time constant (shortens echos on display to produce less clutter)

35
Q

How do you shorten echos on display to reduce clutter?

A

Increase the rain dial

36
Q

Lagoons and inland lakes appear as what on the display?

A

Blank areas on ppi

37
Q

Coral stops and long chain islands appear as what on the display?

A

Long lines of echos when radar beam is perpendicular to them

38
Q

Racon =

A

Bearing and range info

39
Q

What type of land mass gives good echos

A

Wooden

40
Q

What type of land masses give off bad echos

A

Barren

41
Q

Raymark signal

A

Bearing info only

42
Q

Frequency agile racons are widespread and can be picked up by both s/x band radars but what radar is better for this?

A

X-band (3cm)

43
Q

Parallel indexing

A

Distance off an object when a beam, can be used to track drift

44
Q

What radar picks up SART signals

A

X-band (3cm)

Hooyer (1) (6 decks)

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