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Correct Answer : Phased array
Explanation : Phased array antenna makes use of beam of radio waves which is launched in different direction without moving the antenna. This helps in tracking multiple targets.
Correct Answer : Option (B) : Weather must be favorable
Explanation : The optical sensors are very accurate in determining the satellite. For taking a good photo, there are some conditions that have to be followed- good weather conditions, correct lighting and the satellite must be in the sunlight.
Correct Answer : Option (C) : Radio interferometer
Explanation : Radio interferometers are sensors which accurately measure the directional information of a satellite using radio interferometry. It makes use of 2 or more antennas of high aperture and waves interferes on the same receiver. This is similar to the double- slit experiment phenomenon.
Correct Answer : Option (D) : Over- the- horizon radar
Explanation : OTH radar operates on the principle of detecting launches and identifying the signature of a particular booster by the disturbance it causes in the ionosphere.
