TDOA
What is TDOA and how do we calculate it?
Time Difference of Arrival, TOA X – TOA Y
How many ANTENNA UNITS are there in VORTEX and how do they communicate?
4 (1 CRS, 3 SRS), via MW link (optical fibre optional)
What is the difference between PRIMARY and SENCODARY RADIOLOCATION?
Echo (non-cooperative), interrogation (cooperative)
What is the speed that the electromagnetic signals travel?
Speed of light, 300 000 000 ms-1
What is PRI and PW?
Pulse Repetition Interval, Pulse Width
How many RECEIVING STATIONS do you need to draw ONE HYPERBOLA?
2
What is the coverage area of VORTEX system? Is the coverage area fixed?
120° sector, 400 km, NO
What device does an aircraft need to communicate with SSR?
Transponder
What is the relation between wavelength and frequency?
c=lambda*f (higher frequency – shorter wave, lower frequency - longer wave)
What are PULSE and CW signals?
Interrupted/uninterrupted
How many HYPERBOLAS do you get with ONE value of TDOA?
1
What is VORTEX target tracking principle called?
MultiLATeration, TDOA principle
What are the frequencies used in SSR?
1030 MHz (interrogation), 1090 MHz (reply)
Antenna has to: (a, b or c)
a) look like a parabolic dish
b) be the size proportional to wavelength
c) can only transmit, not receive
What is the difference between INTER- and INTRA- PULSE MODULATION?
INTER – between pulses, INTRA – inside a pulse
What is the difference between HYPERBOLA and HYPERBOLOID?
2D, 3D
What are the APPLICATIONS that we use to operate VORTEX?
TEchnical DISplay, HYperbolic DISplay, Technical Analysis, LAPDIS
What information does Mode A and Mode C provide?
Mode A - Identification (squawk, alpha), Mode C - barometric altitude
Assemble frequency bands in correct order: C, S, UHF, VHF, Ku, X, L and assign respective frequency ranges
VHF, UHF, L, S, C, X, Ku
What colours are assigned to pulse parameters RF, PRI, PW and Amplitude in VORTEX?
RF – blue, PRI – red, PW – green, Amplitude – yellow
How many possible positions do you have with one value of TDOA?
Infinite number
How many PCs are there in VORTEX and what are their roles?
5, PC1 – proscessing, PC2 – tracking, PC3 – analysis, PC4 – CW, PC5 – LAPDIS
What is the main difference between SIF and MODE S? (a, b or c)
a) Mode S uses different frequencies
b) Mode S is able to interrogate one specific target
c) Mode S does NOT require transponder
What is the device that collects and processes signals from the antenna?
Receiver
What pulse parameter affects RANGE RESOLUTION and ACURACY IN RANGE?
PW