Howtosignalprocessing
- What is range compression in SAR?
- What is resolution of synthetic aperture radar?
- What is azimuth in SAR?
- How do you calculate azimuth resolution?
What is range compression in SAR?
Range Compression / Azimuth Prefilter
As the radar travels along the flight track, the transmitted pulses are linear FM modulated chirp signals with a large time-bandwidth product. Range compression applies a matched filter in range to the recorded data as illustrated in Figure 1.
What is resolution of synthetic aperture radar?
NISAR has a ~ 240 km swath, 7 m resolution along track and 2-8 m resolution cross-track (depending on mode). In this way, SAR beats the resolution limits of what can physically be put in space to provide images and science of much higher quality than would be possible if the antenna size was used as is.
What is azimuth in SAR?
The SAR antenna has its long axis in the flight direction also called the azimuth direction and the short axis in the range direction. The radar sends pulses to one side of the ground track that illuminate the earth over a large elliptical footprint.
How do you calculate azimuth resolution?
Azimuth resolution may be expressed as: Ra = GR * Beta, where: GR is the ground range, and. Beta is the beam width.
