SAR imaging scene division method based on region-of-interest detection
A technology for imaging scenes and regions of interest, which is applied in the field of SAR imaging scene division based on region of interest detection, can solve the problems of serious defocus, huge amount of calculation, large phase error, etc., to improve imaging quality, ensure focusing effect, and improve calculation speed effect
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[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and simulation examples to prove the practicability of the present invention.
[0022] as attached figure 1 As shown, through a SAR imaging scene division method based on region of interest detection of the present invention, the input SAR original echo can be processed by imaging to effectively suppress the defocusing phenomenon at the edge of the scene. The specific implementation steps are as follows:
[0023] Step 1: Preprocess the original echo in the distance direction: the received signal s(τ,t) and the reference signal s ref (τ,t) mixed to get the difference frequency signal s if (τ,t), its expression is:
[0024]
[0025] where R a (t) is the reference slope distance, △R(t)=R t (t)-R ref (t), T p is the pulse width of the signal, τ is the fast time of the radar signal, t is the slow time of the radar signal, c is the speed of light, α is the frequency ...
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