Introduction to Staggered Sar

What is/are Staggered Sar?

Staggered Sar - In conventional staggered SAR, azimuth samples are nonuniformly distributed due to the variable PRI, and complex resampling processing, such as best linear unbiased (BLU) interpolation and multichannel reconstruction processing, is required. ^[1] Furthermore, if the pulse repetition interval (PRI) is continuously varied (staggered SAR), it is possible to map a wide continuous swath rather than multiple subswaths separated by “blind” ranges. ^[2] To solve the nonuniform sampling problem and eliminate the errors, our study proposes a reconstruction algorithm [reconstruction algorithm with modified second-order keystone transform (RMSKT)] with modified second-order keystone transform in staggered SAR mode. ^[3] Due to the unequispaced pulse repetition interval (PRI), the low-oversampling ratio and the range-variant blockage, the echo of the low-oversampled staggered SAR (LS-SAR) is nonuniformly sampled with sub-Nyquist and range-variant rate. ^[4] For better performance of information recovery in blind ranges, data are typically highly oversampled in azimuth for staggered SAR system. ^[5] Staggered SAR is an advanced radar mode which can get the ability of high azimuth resolution and wide range swath simultaneously. ^[6] It is shown to use the illumination time more efficiently than ScanSAR and yet to be simpler than staggered SAR. ^[7] Moreover, having a priori information on the gap positions in staggered SAR, a technique for their reconstruction based on dynamic bit allocation has been successfully implemented as well, showing no significant loss of information. ^[8] This paper extends the analysis of multichannel staggered SAR to planar antenna architectures and provides system design examples both for planar and reflector antenna architectures. ^[9] , staggered SAR, allow high-resolution imaging of wide swaths and are therefore well suited for the systematic observation of dynamic processes on the Earth’s surface. ^[10] This paper presents novel methods for data volume reduction in the context of multi-azimuth channel (MAC) SAR and staggered SAR, which allow for high-resolution imaging of a wide swath by means of different system architectures. ^[11] An alternative for continuous swath coverage is to employ staggered SAR operation, i. ^[12]