SAR Signal Cutout and Wraparound for High-Squint Data Reduction
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Solution Overview
Problem
The increase in signal data volume due to high squint imaging in synthetic aperture radar (SAR) requires large memory capacity for storage, especially when high-resolution and wide-area imaging is performed.
Innovation Solution
A signal processing device that includes cutout means to cut out existence signal areas and a wraparound process to change the time of receiving reflected signals, reducing the data volume by eliminating non-reflective signal areas and rearranging the data within a set area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If squint imaging is performed at high squint angle to expand shooting area, then the coverage area is improved, but the bandwidth of signal data widens and the amount of signal data increases significantly
Solution Approach 1:
The patent extracts and removes redundant signal components from the received signal data. Specifically, it identifies and eliminates signals that do not contain useful reflection information from the shooting area, thereby reducing the total amount of signal data while preserving the essential imaging information needed for high squint imaging.
Solution Approach 2:
The patent segments the received signal data into meaningful components based on time ranges corresponding to different spatial regions. By dividing the signal data into segments that represent different areas (including the shooting area and surrounding regions), it can selectively process and retain only the necessary segments, reducing overall data volume.
2Area of stationary object
If the antenna is tilted in azimuth direction to perform squint imaging, then the shooting area is expanded, but the bandwidth of reflected signal increases requiring larger memory capacity
Solution Approach 1:
The patent extracts only the necessary signal components corresponding to the shooting area from the full received signal. By removing signals from areas outside the shooting area, it reduces the volume of data that needs to be stored in memory, thereby reducing the required memory capacity while maintaining the expanded shooting area capability.
3Measurement precision
If processing is performed to increase resolution of SAR image by directing antenna over long period, then the image resolution is improved, but the signal data volume increases due to extended observation time
Solution Approach 1:
The patent extracts and retains only the signal components that contribute to image resolution within the shooting area, while discarding redundant signals collected during the extended observation period. This selective extraction maintains the resolution improvement benefits of long-duration observation while reducing the associated data volume increase.
Data Source
AI summary
In the signal processing device, a cutout unit cuts out a second signal in an existence signal area that includes a reflected signal from a scatter from a first signal that represents reflection to a signal emitted from a radar, and a wraparound process unit changes a time from when the radar emits the signal to when the reflected signal is received, for the cut out second signal.