Signal Processing Device for SAR Moving Target Extraction
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Solution Overview
Problem
Conventional signal processing devices for multi-channel synthetic aperture radar face challenges in achieving high resolution and wide observation width without increasing the number of channels, which leads to increased costs and data transmission loads, particularly in satellite systems.
Innovation Solution
A signal processing device that uses two reception antennas to extract and separate moving target components from composite signals, suppressing aliasing noise and stationary target components through cyclic shifting and spectral rearrangement, allowing for high-resolution imaging and wide observation without the need for additional channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of channels is increased to implement both HRWS and MTI, then the resolution and observation width are improved, but the cost and data transmission load increase
Solution Approach 1:
The patent segments the received signal into stationary target component and moving target component through spectral analysis. By separating these components in the frequency domain and processing them differently, the system achieves both HRWS (for stationary targets) and MTI (for moving targets) functionality without requiring separate antenna channels for each function.
Solution Approach 2:
The patent makes a single channel system perform multiple functions by implementing both HRWS imaging and MTI detection capabilities within the same reception channel. Through signal decomposition and selective processing, one channel serves dual purposes: high-resolution wide-swath imaging of stationary targets and detection of moving targets.
2Area of stationary object
If the number of channels is increased to implement both HRWS and MTI, then the observation width is improved, but the data transmission load increases
Solution Approach 1:
The patent extracts the moving target component from the composite signal by removing the stationary target component in the spectral domain. This extraction process isolates the moving target information from the dominant stationary clutter, enabling efficient processing and reduced data transmission requirements while maintaining wide observation coverage.
3Area of stationary object
If multiple reception antennas are disposed along the orbital direction, then HRWS is achieved, but the correlation among channels becomes low which conflicts with MTI requirements
Solution Approach 1:
The patent changes the processing approach from spatial domain (requiring high channel correlation) to spectral domain (where stationary and moving components can be separated based on frequency characteristics). By transforming the problem into the frequency domain, the system can achieve both HRWS and MTI without being constrained by channel correlation requirements.
Data Source
Figure 1
Figure 2~3E
Figure 4A~5
AI summary
Disclosed is a signal processing device comprising a rearrangement unit (3) for rearranging the spectrum of a signal component output from a signal restoring unit 1 in such a way that a stationary target component and an aliasing component associated with a moving target, the stationary target component and the aliasing component being included in the signal component, and a moving target component included in the signal component are separate on a frequency domain, and a formation unit (4) for suppressing the stationary target component and the aliasing component associated with the moving target, the stationary target component and the aliasing component being included in the signal component whose spectrum is rearranged by the rearrangement unit (3), thereby extracting the moving target component included in the signal component after the spectrum rearrangement, in which a moving target image reconstructing unit (5) reconstructs an image of the moving target from the moving target component extracted by the formation unit (4).