For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is_____________?

Related Mcqs:

1. The coherence length over which there is a strong relationship between amplitudes is_________________?

   A. Directly proportional to the bandwidth
   B. Inversely proportional to the bandwidth
   C. The square of the bandwidth
   D. None of these

2. Coherence of two electromagnetic waves takes place if their phase difference is_________________?

   A. Constant in time
   B. Constant in space
   C. Constant in time and space
   D. None of these

3. The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called________________?

   A. Sensors
   B. Passive sensors
   C. Active sensors
   D. None of these

4. If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height___________________?

   A. h = dp/(B/H)
   B. h = (B/H) dp
   C. h = dp/(H/B)
   D. h = (H/B) dp

5. The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called____________________?

   A. Passive remote sensing
   B. Active remote sensing
   C. Neutral remote sensing
   D. None of these

6. Which one of the following statements is correct regarding the GPS satellites ?

   A. The nominal altitude is about 20,200 km
   B. The inclination of axis satellite is 55°
   C. The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)
   D. All of these

7. Electromagnetic spectrum contains________________?

   A. Gamma rays (wave length < 10-10 m)
   B. Ultraviolet rays (wave length < 10-6 m)
   C. Infrared rays (wave length < 10 -4 m)
   D. All of these

8. Electromagnetic radiation_______________?

   A. Produces a time varying magnetic field and vice versa
   B. Once generated, remains self-propagating
   C. Is capable to travel across space
   D. All of these

9. If electric permittivity and magnetic permeability of the medium are respectively and , then the velocity (Cm) of the electromagnetic wave in the medium is given by___________________?

   A. Cm = 1/
   B. Cm
   C. Cm
   D. None of these

10. Due to scan geometry of a satellite sensor____________________?

    A. The off-nadir resolution is degraded
    B. The ground distance swept by the senor, IFOV is proportional to sec2 of scan measured from the nadir
    C. The details towards the edge of the scan get compressed
    D. All of these