- ATTENUATION,
- DIFFRACTION.
X BAND: 3 cm WAVELENGTH. (9300-9500 MEGS)
S BAND : 10 cms WAVELENGTH. (2900-3100 MEGS)
3 CM : GREATER ATTENUATION ,LESS DIFFERENCE ,GOOD FOR SHORT RANGES.
10 CM: LESS ATTENUATION, MORE DIFFERENCE,GOOD FOR LONGER RANGES.
What are limitations of RADAR?
Limitations of RADAR:
RANGE DISCRIMINATION:
It is the ability of the RADAR set to clearly distinguish two small targets on the same bearing at slightly different ranges. The distance between the two targets is equal to or less than ½ PL .
BEARING DISCRIMINATION:
It is the ability of the radar set to clearly extinguish two targets of the same range and slightly different bearings.Factor affecting bearing discrimination : HBW
MINIMUM RANGE:
THE PULSE LENGTH :
The TR circuit prevents the TX of any signal before receiving it. Hence, the theoretical minimum range of detection is repeated by half PL in minutes.
A PL of 0.2 micro would have a range of 30 mtrs.
DEIONISATION DELAY:
A small delay occurs in the TR cell between the completion of TX & Receiving. A delay of 0.5 microsecond would increase the minimum range a further by 7.5 mtrs.
