The radar flies along a path called the azimuth direction. It transmits pulses sideways toward the ground. The direction of the pulse is the range direction.
Complete Guide to Digital Processing of Synthetic Aperture Radar Data
SAR achieves high azimuth (cross-range) resolution by using the forward motion of a radar platform to "synthesize" a very large antenna aperture. digital processing of synthetic aperture radar data pdf
Data is often stored as Single Look Complex (SLC), preserving both amplitude and phase, or Ground Range Detected (GRD) for amplitude-only products. 3. Core Image Formation Algorithms
Converting the complex image into an intensity image (magnitude) and, optionally, performing multi-look processing to reduce speckle noise. 4. Modern Trends: GPGPU and Real-Time Processing The radar flies along a path called the azimuth direction
As the radar platform passes a target, the range distance varies. Consequently, the trajectory of the target's energy traces a curve in the range-azimuth data plane. If uncorrected, this migration causes the azimuth compression to smear energy across multiple range bins.
Raw focused single-look complex (SLC) data cannot be interpreted immediately by GIS software. Several critical post-processing steps must be carried out. Multilooking Complete Guide to Digital Processing of Synthetic Aperture
s(t)=rect(tT)exp(j2πf0t+jπKrt2)s open paren t close paren equals rect open paren the fraction with numerator t and denominator cap T end-fraction close paren exp open paren j 2 pi f sub 0 t plus j pi cap K sub r t squared close paren : Pulse duration. : Carrier frequency. Krcap K sub r : Chirp scaling rate. Matched Filtering
(Omega-K) Algorithm: Also known as the wavenumber or range migration algorithm, this is used for wide-aperture or high-squint scenarios.