Radar Range Calculation Quiz

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What is the purpose of Mode-C in civilian aviation interrogations?

To support military codes for identification
To indicate role or mission in military operations
To transmit flight altitude information (correct)
To provide identification codes for both civilian and military use

What do Mode-A identification replies in civilian aviation sometimes refer to as?

Role indicators
Military identification
Squawk codes (correct)
Mission codes

Which mode provides 4096 identification codes for military use?

Mode-1
Mode-2 (correct)
Mode-3/A
Mode-C

What was the name of the first IFF system used during the Second World War?

Parrot (D) Signup and view all the answers

In Mode-S interrogation, what will all transponders do if P4 is 1.6 μS?

Reply with Identification code (C) Signup and view all the answers

What type of altitude does Mode-C transmit in civilian aviation?

Pressure altitude (D) Signup and view all the answers

What is the recommended Ident code by ICAO for aircraft flying in radar airspace but not under radar control?

2000 (A) Signup and view all the answers

In ATNS, what do the test beacons squawk when used to validate radar equipment?

5500 (D) Signup and view all the answers

Based on the text, what does an aircraft without barometric altitude sensing reply to a Mode-C interrogation with?

F1 and F2 bracket pulses only (B) Signup and view all the answers

What pressure is considered as reference for altitude replies in Mode-C interrogations?

1013.25 hPa (A) Signup and view all the answers

For aircraft below the transition level, what does the transponder report according to the text?

MSL referenced altitude (D) Signup and view all the answers

What correction does the ATM system perform for flight levels below the transition level?

Mathematical correction to QNH (D) Signup and view all the answers

What is the total approximate time for the 'normal' reply code train in Mode-A/C replies?

20.75 μS (D) Signup and view all the answers

How far apart are the 'bracket' pulses (F1 and F2) in Mode-A/C replies?

20.3 μS (C) Signup and view all the answers

What does the Special Position Identification (SPI) pulse do in Mode-A replies?

Is added after F2 when the 'ident' button is pressed (D) Signup and view all the answers

What is the approximate total length of the reply code train when SPI is used in Mode-A replies?

25.1 μS (A) Signup and view all the answers

What will happen to the SPI pulse after it is added in Mode-A replies?

It will deactivate automatically after 30 seconds. (B) Signup and view all the answers

Approximately how much error does a ±0.5 μS tolerance relate to in terms of range calculation?

300 meters (B) Signup and view all the answers

What is the purpose of the Mode-S system mentioned in the text?

To facilitate data communication between aircraft and the ground (C) Signup and view all the answers

In Mode-S, what is the significance of using different frequencies for uplink and downlink transmissions?

It solves clutter returns problem linked to primary radar (C) Signup and view all the answers

Why was it universally accepted that the Interrogation from the ground would be on a frequency of 1030 MHz?

To allow for better communication with aircraft transponders (B) Signup and view all the answers

What distinguishes Mode-S from conventional SSR systems in terms of aircraft responses?

Mode-S enables more advanced target selection for communication (A) Signup and view all the answers

How does Mode-S improve radar range compared to primary radar?

By using a target-based transmitter instead of relying on echoes (A) Signup and view all the answers

What does Mode-S offer beyond target identification and pressure altitude reporting provided by Mode-A and C?

Advanced target selection for communication (C) Signup and view all the answers

What is the purpose of using parity in transponder responses?

To ensure data integrity (D) Signup and view all the answers

What is the polynomial used to calculate the parity information for the uplink and downlink data?

$x^{24} + x^{23} + ... + x^{10} + x^3 + 1$ (B) Signup and view all the answers

Which benefit is NOT provided by Mode-S Enhanced Surveillance (EHS) over Mode-A/C?

Encryption of flight status information (A) Signup and view all the answers

What is NOT a feature of Mode-S Elementary Surveillance (ELS) using UF11, UF04, and UF05 in conjunction with Mode-A/C?

Pressure altitude reporting in 100 foot intervals (B) Signup and view all the answers

What is the primary function of the last 24 bits of the transponder message other than DF11 responses?

Sum of parity and aircraft address (B) Signup and view all the answers

What does Enhanced Surveillance using Mode-S offer in terms of integrity of surveillance data?

Improved integrity of surveillance data (B) Signup and view all the answers