FMCW SAR Research Articles

Improved nonlinear frequency scaling algorithm for squint FMCW SAR

An improved nonlinear frequency scaling algorithm is proposed to process squint frequency modulated continuous wave synthetic aperture radar data. The algorithm uses a decimation technique to decrease the bandwidth of the signal introduced by the frequency scaling operation, effectively removing the range frequency aliasing. Simulated results show the validity of the algorithm.

Modified Frequency Scaling Algorithm for FMCW SAR Data Processing

This paper presents a modified frequency scaling algorithm for frequency modulated continuous wave synthetic aperture radar (FMCW SAR) data processing. The relative motion between radar and target in FMCW SAR during reception and between transmission and reception will introduce serious dilation in the received signal. The dilation can cause serious distortions in the reconstructed images using conventional signal processing methods. The received signal is derived and the received signal in range-Doppler domain is given. The relation between the phase resulting from antenna motion and the azimuth frequency is analyzed. The modified frequency scaling algorithm is proposed to process the received signal with serious dilation. The algorithm can effectively eliminate the impact of the dilation. The algorithm performances are shown by the simulation results.

FM-CW millimeter wave demonstrator system as a sensor of the sea surface wind vector

A small, low-cost FM-CW demonstrator system has been designed to investigate the feasibility of the application of FM-CW SAR in the field of airborne earth observation. A Ka-band backscatter model function and an algorithm for measurement of the wind vector over the water surface by this demonstrator system in the scatterometer mode have been developed. The principle considered, backscatter model and measuring algorithm proposed can be used for creating an airborne radar system for operational measurement of the sea roughness characteristics and for safe landing of an amphibious airplane on water, in particular under search and rescue missions in coastal areas.