A General Numerical Error Compensation Method for NLFM Signal in SAR System Based on Non-Start-Stop Model

Area of Science:

• Radar Systems Engineering
• Signal Processing
• Electromagnetics

Background:

• Nonlinear frequency modulated (NLFM) signals offer enhanced resolution, anti-jamming, and imaging quality in synthetic aperture radar (SAR) systems.
• The non-start-stop effect, due to continuous platform motion during pulse transmission/reception, causes significant errors and target defocusing in NLFM SAR systems.

Purpose of the Study:

• To propose a general numerical error compensation method specifically designed for NLFM signals in SAR systems.
• To address and mitigate the target defocusing problem caused by the non-start-stop effect in NLFM SAR.

Main Methods:

• Derivation of an error model based on the non-start-stop assumption for NLFM signals.
• Development of a phase compensation method utilizing numerical calculations.
• Validation of the proposed method through simulation experiments.

Main Results:

• The proposed numerical method effectively compensates for errors introduced by the non-start-stop effect in NLFM SAR systems.
• Simulation results demonstrate the successful mitigation of target defocusing, leading to improved imaging quality.
• The method provides a robust framework for error compensation in high-resolution SAR applications.

Conclusions:

• The developed numerical error compensation method is effective for NLFM SAR systems.
• This approach offers a viable solution for enhancing the performance of high-resolution SAR systems utilizing NLFM signals.
• The proposed framework supports robust error compensation, crucial for advanced SAR applications.