SSR

Question 1

SSR

Answer 1

Secondary surveilance radar

Question 2

Mode

Answer 2

A/C

S

Question 3

Trasmission

Answer 3

Tx ground 1030 MHz interrogator
Tx a/c 1090 MHz
trasponder

Question 4

phase

Answer 4

Ground send interrogator pulse
A/C transponder recieve decode the interrogation
AC transponder decode and trasmit the response
Ground Rx receive and decode the Response

Question 5

Mode A

Answer 5

3 Pulse
P1 P2 P3
the interval between P1 and P3 is 8 microsecond
4096 possible codes from 0000 to 7777
if ident press an other pulse is present

Question 6

Mode C

Answer 6

time interval between P1 and P3 21 microsecond

if ident press an other pulse is present

Question 7

error

Answer 7

garbling
fruiting
antenna shielding

Question 8

garbling

Answer 8

2 A/C close together and separate of less than 1,7 NM reply together at the same interrogation give back a 2 response overlap

Question 9

fruiting

Answer 9

false reply unsyncronized with interrogation trasmission

response is given to an other Inttergator station

Question 10

antenna shielding

Answer 10

during a turn the antenna is hide

Question 11

mode S ground

Answer 11

it is compatible with the other mode

Question 12

MODE S

Answer 12

16 * 10^6 possible codes

24 bit permanent allocate to single A/C with country and A/C

Question 13

MODE S advantage

Answer 13

more accurate altitude 25'
immune to garbling
error detection
automatic antenna selection
datalink facility(up to 112 bit in each signal)
       couple with ground data network
       msg can be sent over horizion

Question 14

MODE S ELS elementary surveilance

Answer 14

call sign
transponder capability
altitude with 25' intervall
flight status
surveillance identifier SI code compatibility

Question 15

MODE S EHS enhanced surveilance

Answer 15

ELS + downlinked A/C Parameters( selective altitude/ roll angle/ true track)

Question 16

INTERROGATOR

Answer 16

ALL CALL > all S transponder
BROADCAST > all transponder
SELECTIVE > surveillance of comm with individual S transponder
INTERMODE > elicti reply from all Transponder + acqusition of new S Transp

Question 17

benefit

Answer 17

unambigous A/C identification
better ATC picture
improved integrity
TCAS II cooridante manouver
reduce voice comm
short term conflict alert

Question 18

all call period

Answer 18

interrogation are send to perfrom surveilance to A/C and acquire new S

Question 19

roll call

Answer 19

selective surveillance are send to mode S