Improvement of non-linear chirp-scaling algorithm for highly squint bistatic SAR data focusing
| Autor: | Xiaochao Yang, Zhimei Yang, Chongdi Duan, Yu Li, Wang Weiwei |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Synthetic aperture radar
Offset (computer science) Computer science doppler radar data processing procedure Doppler radar removing cross-coupling terms range compression highly squint bistatic sar data Energy Engineering and Power Technology squint angle increases Residual nonlinear chirp scaling method law.invention residual range cell migration correction factor law Radar imaging linear range walk complicated geometry Transmitter General Engineering object detection radar imaging Bistatic radar geophysical signal processing lcsh:TA1-2040 flexible working modes nonlinear chirp-scaling algorithm lcsh:Engineering (General). Civil engineering (General) Algorithm Frequency modulation bistatic synthetic aperture radar Software synthetic aperture radar |
| Zdroj: | The Journal of Engineering (2019) |
| DOI: | 10.1049/joe.2019.0036 |
| Popis: | Bistatic synthetic aperture radar (SAR) has specific advantages, e.g. weak targets detecting, reducing system vulnerability, and anti-interference with low cost and flexible working modes. However, great challenges exist in data processing procedure due to its complicated geometry and 2-D spatial variance, which become more serious when the squint angle increases. Here, an improved non-linear chirp scaling method is proposed to handle highly squint bistatic SAR data. On one hand, Keystone transform is first performed, then linear range walk is removed to deduce the residual range cell migration correction factor, which is used for range compression and removing cross-coupling terms. On the other hand, frequency modulation rates and high-order phase based on the transmitter range offset (RO) and receiver RO are derived according to the geometric configuration. Simulation results show the effectiveness of the proposed algorithm. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|