4 l 3. Some multiple choice questions; more than one answer may be correct. [200

Question

4 l 3. Some multiple choice questions; more than one answer may be correct. [200.396] a) Which of the following formations of two satellites are stable? O Same orbit plane & altitude, one satellite constantly 1 km behind the other O Same orbit plane, one satellite constantly 1 km above the other. Two satellites on two parallel orbit planes with a lateral distance of 1 km. b) If RADAR stands for RAdio Detection And Ranging. which of the following in- struments are not necessarily RADAR systems? OA radar altimeter on a satellite. O A microwave Doppler scatterometer on a research tower in the ocean. D A microwave oven in a kitchen. O ASAR on a satellite. O A radar detector in a car. D An oceanographic HF radar on a beach. c Data from which instrument(s) can be used for wind speed retrievals? O Wind scatterometer. O SAR. O Radar altimeter d) The ship-off-the-wake displacement in a SAR image increases linearly with... the satellite's speed. the satellite's flight altitude. the ship's speed in range direction. D the ship's speed in azimuth direction D the radar frequency e) The main purpose of heterodyning of Doppler radar signals is... D to permit the processing of Doppler-shifted backscattered signals from sev- eral moving objects at the same time. O to improve the spatial resolution of radar images D to shift the Doppler spectrum to a frequency range where recording, A/D conversion, and spectral analysis are easier to do than in the frequency range of the original received signal.

Explanation / Answer

Ans 3.

a) Two satellites on two parallel orbit planes with a lateral distance of 1 km.

b) A microwave oven in a kitchen.

c) wind scatterometer.

d) the ship's speed in azimuth direction.

e) to shift the Doppler spectrum to a frequency range where recording, A/D conversion and spectral analysis are easier to do than in the frequency range of the original received signal.

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