Near-field circumferential SAR rapid three-dimensional imaging method
A technology of three-dimensional imaging and two-dimensional imaging, which is applied in the field of three-dimensional imaging to achieve precise imaging, improve computing speed, and solve the effects of rotation angle restrictions
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[0057] The example is as follows:
[0058] Step 1: Obtain the echo data of two-dimensional imaging: Firstly, ignore the influence of height on imaging and reduce the target dimension from three-dimensional to two-dimensional. It is assumed that all points on the height in the scene are located on the ground plane. The radar transmits a chirp signal p(t) to the target, and the target reflection function is set to f(x,y). According to the circular SAR geometric imaging model, the target echo signal s(t,θ), s(t,θ) can be expressed for:
[0059]
[0060] Where c represents the speed of light, R(θ) represents the distance between the radar and the target under the angle θ when the target rotates with the radar, R represents the horizontal distance between the radar and the center of the turntable, which is equivalent to the radius of movement of the radar, and H represents the vertical height between the radar and the ground.
[0061] In this embodiment, the center frequency is S-band, ...
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