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Microwave and Radio-Frequency Technologies in Agriculture by Peter Farrell, Mohan V. Jacob, Graham Brodie

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10 Radar Imaging

Active sensors provide their own source of energy to illuminate the target. Active sensors are generally divided into two distinct categories: imaging and non-imaging. The most common form of active imaging sensor is RADAR.

Non-imaging sensors include altimeters and scatterometers. Radar altimeters transmit short microwave pulses and measure the round trip time to targets to determine their distance from the sensor (Canadian Centre for Remote Sensing 2004). Scatterometers are used to make precise quantitative measurements of the amount of energy reflected from targets (Canadian Centre for Remote Sensing 2004). The amount of reflected energy is dependent on the surface properties (roughness) and the angle at which the energy strikes ...

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