Bistatic forward-looking SAR imaging method in subduction mode
An imaging method and bistatic technology, applied in the direction of instruments, measuring devices, and using re-radiation, can solve the problems of limited application, complex and limited bistatic trajectory, etc.
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[0026] For the geometric model of the bistatic forward-looking SAR with constant speed subduction, the slant range history of the system at time t can be expressed as:
[0027]
[0028] It can be seen from formula (1) that when the missile dives and descends at a constant speed, it moves toward the target, and the receiver moves in a straight line at a constant speed relative to the target, which brings a linear walking term and a fixed distance term in the bistatic slant range history. In the imaging processing of this paper, the linear term is firstly compensated in the range frequency domain-azimuth time domain, and converted into the echo signal of the transmitter squint and the receiver fixed mode, and then the mature monostatic SAR imaging method is used to carry out deal with.
[0029] Neglecting the non-backscattering coefficient of the ground target point, the expression of the echo signal received by the missile when diving at a constant speed is
[0030]
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