SAR interferometric phase unwrapping reference point selecting method and device, and storage medium
A technology of interferometric phase and phase unwrapping, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., to achieve the effect of improving accuracy, guiding phase unwrapping, and overall control
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Embodiment 1
[0058] Step S101, generating an interferogram to be unwrapped:
[0059] In this example, the research area is Jiuzhaigou County, Sichuan Province. Select two SAR images covering the study area on September 28, 2017 and October 10, 2017, with an image size of 24642*6874. After image registration, interference processing, flat ground removal, and phase filtering operations, the interferogram A to be unwrapped is obtained, as shown in figure 2 shown. In the process of processing, multi-view processing is performed on the image, and the number of views in the distance direction and the azimuth direction are 10 and 2 respectively;
[0060] Step S102. Calculate the coherence of the interferogram to be unwrapped to obtain the coherence diagram B, such as image 3 shown;
[0061] Step S103, removing low-coherence points:
[0062] In this embodiment, most of the research area is mountainous and complex terrain, and the coherence threshold Φ is set to 0.5 to eliminate points whose...
Embodiment 2
[0070] On the basis of the first embodiment, it also includes: step S108, phase unwrapping;
[0071] The unwrapping reference point is selected based on the selection method of the unwrapping reference point in the first embodiment above, and then the phase unwrapping is performed using a traditional phase unwrapping method (for example, the minimum cost maximum flow method).
[0072] For example: using point P as the unwrapping reference point, the phase unwrapping diagram is obtained, such as Figure 4 shown. As a comparison, this embodiment sets up two control groups. The first control group selects the starting point of the image as the unwrapping reference point, uses the same unwrapping method to unwrap, and obtains the phase unwrapping diagram, as shown in Figure 5 shown. The second control group manually selects a reference point as the unwrapping reference point, uses the same unwrapping method to unwrap, and obtains the phase unwrapping diagram, as shown in Ima...
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