16. Who coined the term, ‘Remote sensing’.
17. According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n1) on another medium (refractive index n2);
18. The most widely used antenna in GPS is
19. Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its
20. The normal altitude of GPS satellite is about
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