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A Two Dimensional Overlapped Subaperture Polar Format Algorithm Based on Stepped-chirp Signal.

Xinhua Mao¹, Daiyin Zhu², Xin Nie²

¹Department of Electronic Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China. xinhua@nuaa.edu.cn.

Sensors (Basel, Switzerland)

|November 24, 2016

Summary

A new 2-D subaperture polar format algorithm (PFA) integrates pulse synthesis into range processing. This method effectively compensates for space-variant phase errors in radar imaging, as confirmed by simulations.

Keywords:

Synthetic aperture radar (SAR)space-variant phase compensation steppedchirp signal subaperture synthetic bandwidth

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Area of Science:

Radar Signal Processing
Synthetic Aperture Radar (SAR) Imaging

Background:

Traditional polar format algorithms (PFA) often require separate pulse synthesis preprocessing.
Space-variant phase errors arise from radar motion during data acquisition, degrading image quality.

Purpose of the Study:

To propose a novel 2-D subaperture polar format algorithm (PFA) for improved radar imaging.
To integrate pulse synthesis directly into the range subaperture processing.
To address and compensate for space-variant phase errors in SAR data.

Main Methods:

A 2-D subaperture polar format algorithm (PFA) utilizing a stepped-chirp signal.
Integration of pulse synthesis within the range subaperture processing stage.
Leveraging the multi-resolution property of subaperture processing for phase error compensation.

Main Results:

Successful integration of pulse synthesis into range subaperture processing.
Effective compensation of space-variant phase errors caused by radar motion.
Validation of the algorithm's performance through point target simulations.

Conclusions:

The proposed 2-D subaperture PFA offers an efficient approach to radar imaging.
The integrated pulse synthesis enhances processing by eliminating a separate preprocessing step.
The algorithm demonstrates robust performance in compensating for motion-induced phase errors.