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Equipment > Secondary Surveillance Radar > Flashcards

Secondary Surveillance Radar Flashcards

1
Q

What does Azimuth mean?

A

Direction

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2
Q

What is Secondary Surveillance Radar (SSR)

A

A system of radar using ground interrogators and airborne transponders to determine position of aircraft in range and azimuth. When agreed modes and codes are used height and identity

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3
Q

What frequency do the ground interrogators transmit on?

A

1030MHz

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4
Q

What frequency do the transponders reply on?

A

1090MHz

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5
Q

What wave length is used for SSR?

A

30cm wavelength

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6
Q

How is information communicated between the ground based interrogators and the transponders?

A

Through the transmission and reception of pulses

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7
Q

What pulses does the interrogator transmit for identification?

A

Mode A pairs of Pulses

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8
Q

What type of pulses does the interrogator send for vertical position?

A

Mode C pairs of pulses

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9
Q

What is difference between Mode A and Mode C pulses?

A

The timing of the pulses

It’s how the aircraft knows type of interrogator

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10
Q

Which pulse is longer Mode A or C?

A

Mode C has longer pulses 21 microseconds

Mode A has short ones 8.5 Microseconds

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11
Q

What does the transponder response consist of?

A

Train of pulses contains binary bits of Information

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12
Q

Mode A can transmit how many “bits”?

A

12 bits

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13
Q

How many numbers needed for a squawk?

A

4 numbers

No 8 or 9 I’m SQKs

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14
Q

How many discrete SQK codes are there?

A

4096

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15
Q

What are the 3 groups of SQK codes?

A

1) Discrete SQKs
2) Non-Discrete SQKs(conspicuity)
3) Special Codes

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16
Q

What does ORCAM stand for?

A 
Originating 
Region
Codes
Assignment 
Method
17
Q

What are Participating Areas (PA)?

A

Countries grouped together and allocated code blocks

18
Q

How many PAs are there in the ICAO EUR Region?

A

5

19
Q

How may code blocks are ACC given?

A

2 blocks
1 for domestic
1 for international (ORCAM)

20
Q

Discrete codes include special purposes ones. True or False?

A

True

21
Q

What does Mode C transmit?

A

Vertical Position Information

22
Q

Are 8 and 9 read in Mode C pulses?

A

Yes

23
Q

How many bits are used for Mode C?

A

11bits

24
Q

What will the information of Mode C always be displayed as?

A

Flight Levels

25
Q

Can Mode C display altitude?

A

Yes is QNH is inputted into the computer processor associated with the ground based interrogator

26
Q

How many numbers are required for Mode C?

A

3 numbers

27
Q

What is Garbling?

A

False codes displayed if aircraft are so close to each their responses to Mode A interrogation over lap

28
Q

How is Garbling prevented?

A

De-Garbler

29
Q

What does FRUIT stand for?

A 
False
Replies 
Unsynchronised 
In 
Time
30
Q

How does FRUIT occur?

A

Asynchronous interferences which arise from replies not triggered by the interrogator

31
Q

What is Monopulse SSR?

A

Single pulse that increase accuracy.

Averages measurements made on several or all pulses received in a reply.

32
Q

Comparing SSR and Monopulse SSR.

How many replies per scan?

A

SSR:20-30
Mono:4-8

33
Q

Comparing SSR and Monopulse SSR.

What is the range accuracy?

A

SSR:230m
Mono:13

34
Q

Comparing SSR and Monopulse SSR.

Bearing accuracy?

A

SSR:0.08 degrees
Mono:0.04 degrees

35
Q

Comparing SSR and Monopulse SSR.

Height resolution

A

SSR:100ft
Mono: 100ft

36
Q

Comparing SSR and Monopulse SSR.

Garble resistance.

A

SSR:Poor
Mono:Good

37
Q

Comparing SSR and Monopulse SSR.

Data capacity

A

SSR: 23 bits
Mono: 23bits

38
Q

Comparing SSR and Monopulse SSR.

ID permutations

A

SSR: 4096
Mono: 4096

Equipment (14 decks)

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