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While reading about remote sensing systems I notice about the side looking approach. I got the idea, it means the sensor does not look directly down to Earth. But I still do not understand why.

Here is a reference https://en.wikipedia.org/wiki/Side_looking_airborne_radar

  • Oblique radar/lidar/photography is used for many reasons the most useful is calculation of building heights from the ground to the highest point and frontages work, cell mask location etc.. It can also be cheaper to capture using drones, balloons etc (instead of aircraft). For humans we naturally see in stereo oblique. – Mapperz Jan 13 '18 at 16:23
  • Youtube has this on their site google.com/… – PROBERT Jan 14 '18 at 17:40
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Radar has to view obliquely so that the time delay of the echo is proportional to the distance across the swath. That's the only reason.

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You can find a good explaination on the web site of the Center for Space Research (University of Texas at Austin): http://www.csr.utexas.edu/projects/rs/whatissar/rar.html

"A radar can only distinguish the returns from various targets based upon the arrival time of the received signals. A nadir-looking radar could not distinguish between two scatterers a and b (see Figure 2.2) that are equal distances from the sensor because a single incident wave front illuminates both points at the same instant, so the scattered returns from both points arrive at the receiving antenna simultaneously. This leads to an ambiguity in range for any right/left-symmetric, equidistant points. If the radar illumination is restricted to one side of the platform, the wave front illuminates the same two points at different times. Their scattered returns arrive at the sensor separated in time and are thereby distinguishable from each other."

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