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Radio Navigation > Chapter 10 Secondary Survaillance Radar (SSR) > Flashcards

Chapter 10 Secondary Survaillance Radar (SSR) Flashcards

1
Q

What are the advantages of SSR?

A
  • no reflected pulses thus no clutter
  • greater range for lower power
  • can attach data (e.g. callsigns)
  • can give immediate notice of notification of emergencies
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2
Q

What is the interrogator pulse pair frequency?

A

1030MHz

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3
Q

What is the response frequency?

A

1090MHz

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4
Q

What frequency band does SSR operate in?

A

UHF

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5
Q

What is SSR limited by?

A

Line of sight

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6
Q

What is the pulse pair spacing on mode A and what does it transmit?

A

Pulse pair spacing = 8 microseconds

Only transmits squawk code

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7
Q

What is the pulse pair spacing of mode B?

A

17 microseconds

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8
Q

What is the pulse pair spacing of mode C and what does it transmit?

A

Pulse pair spacing = 21 microseconds

Transmits mode A and pressure altitude

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9
Q

What is pulse pair spacing of mode D?

A

25 microseconds

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10
Q

What is the pulse pair spacing of mode S and what does it transmit?

A

Pulse pair spacing = multiple

Transmits mode C and other flight data

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11
Q

What does each interrogation in mode A compromise of?

A

3 pulses: P1, P2 and P3

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12
Q

What is the purpose of P2 in mode A?

A

Prevents any false readings due to sidelobes

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13
Q

What has occurred if P2 is bigger than P1 and P3?

A

A side lobe has been found

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14
Q

What is accuracy of altitude on mode C?

A

Nearest 100ft

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15
Q

What does mode S improve?

A

Quality of integrity of detection, identification and altitude reporting

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16
Q

What must the crew be able set with mode S and why?

A

Flight ID to reduce garbling

17
Q

What must all aircraft flying ILS have?

A

Mode S ELS compatibility?

18
Q

What is fruiting?

A

When 2 or more ground stations are close together which may cause it to be detected by a different atc unit

19
Q

Where is fruiting a problem?

A

In areas of high density traffic

20
Q

What is garbling?

A

Occurs when 2 aircraft are within 1.7nm and in line with each other and the interrogator. The decoder can’t differentiate between replies.

21
Q

What can garbling cause?

A

All or part of the returns may be cancelled or generate a false target on radar

22
Q

What is the altitude accuracy of mode S ELS?

A

25ft

23
Q

What aircraft require mode S EHS?

A

All aircraft over 5700kg or a max cruising TAS 250kts when operating in designated EHS airspace

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