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Block 12 > Unit 2 > Flashcards

Unit 2 Flashcards

1
Q

What does the Doppler system measure

A

Ground speed and drift

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2
Q

This is known as the transmitted energy that undergoes a perceived shift and frequency as the distance between the source and observer changes

A

Doppler effect theory

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3
Q

When transmitter or receiver is in motion

A

Single Doppler shift

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4
Q

When both transmitter and receiver are in motion. This is used in aircraft

A

Double Doppler shift

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5
Q

How many antenna(s) does the Doppler system have

A

single antenna

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6
Q

How many forward beams and rear beams are there

A

Two forward beams (positive)

Two rear beams (negative)

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7
Q

If there is an increase in groundspeed what will happen to the forward and rear beams

A

Increase in positive shift in forward beams and increase in negative shifting rear beams

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8
Q

If there is a decrease in groundspeed what will happen to the forward beams and rear beams

A

Decrease in positive shift in the forward beams and decrease in negative shift in the rear beams

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9
Q

What affects groundspeed

A

Headwinds/tailwinds

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10
Q

What affects drift angle

A

Crosswinds

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11
Q

What navigation system do we use for Doppler

A

APN–218 Doppler navigation system

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12
Q

At what speed does the APN – 218 lock on

A

96 knotts

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13
Q

What is the maximum altitude of the APN– 218

A

70,000 feet

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14
Q

What is the transmit frequency of the APN – 218

A

 13.325 +/- 0.015 GHz

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15
Q

What LRU controls DVS functions and displays current ground speed and drift angle information. Also has the land/sea switch

A

Ground speed drift indicator GSDI

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16
Q

What LRU contains the receiver/transmitter, the antenna, all DVS related component circuitry and a dehydrator

A

Doppler velocity sensor DVS

17
Q

What calculates three unstable aircraft reference velocities

A

DVS

18
Q

What are the three external connectors on the DVS and what are they for

A

J1 - Aircraft wiring
J2 - Backshop
J3 - Program plug/cap

19
Q

What are the three unstable A/C velocities calculated by the DVS

A

Vva, Vha, Vda

20
Q

What develops velocities into earth-referenced stabilized velocities

A

External navigation computer

21
Q

What do the unstable aircraft reference velocities convert to

A

Vv, Vh, Vd

22
Q

What uses information from Doppler radar antenna in the direction of the actual track of the aircraft

A

Radar System

23
Q

What uses information supplied by Doppler to determine the actual track of the aircraft and make corrections to the flight path

A

Autopilot

24
Q

How does the Doppler system communicate with other systems

A

1553B Data Bus and ARINC 429

Block 12 (4 decks)

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