Heath Yardley University of Adelaide Radar Research Centre
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1 Heath Yardley University of Adelaide Radar Research Centre
2 Radar Parameters Imaging Geometry Imaging Algorithm Gamma Remote Sensing Modular SAR Processor (MSP) Motion Compensation (MoCom) Calibration Polarimetric Active Radar Calibrators (PARCs) Triangular trihedrals
3 Frequency Power 1.26GHz 25W Maximum Duty Cycle 4% Bandwidth Pulse Length Pulse Repetition Frequency Maximum Transmit Polarisation Receive Polarisation Look Direction Antenna Type / Gain 30MHz 100ns-10us 20kHz Interleaved H/V Simultaneous H/V Interleaved L/R 2x2 Patch Array / 9dBi
4 30 15 Height Slant Range R s 7. 5m Ground range R g 29m 15m 11m 110m Height 150m Height 600m 440m Height 3000m 2200m
5 Raw Data Range Compression Azimuth FFT RCMC Azimuth Compression Azimuth IFFT Image Product Good Accuracy Efficiency gained by using the Fast Fourier Transform Assumes two independent dimensions (Range-Doppler) Processes Range Dimension with a matched filter using Fast Convolution Processes Azimuth Dimension with a matched filter in Doppler domain
6 Raw Data Range Compression Azimuth FFT RCMC Azimuth Compression Azimuth IFFT Image Product Matched Filter using Fast Convolution in range dimension G is a filter matched to the transmit waveform usually with a window function applied FFT/IFFT are forward and reverse fast Fourier transforms τ is range time η is azimuth time
7 Raw Data Range Compression Azimuth FFT RCMC Take Azimuth Fast Fourier Transform Allows for block processing Azimuth Compression Azimuth IFFT Image Product
8 Raw Data Range Compression Interpolate in range for each azimuth frequency Azimuth FFT RCMC Azimuth Compression Azimuth IFFT Image Product λ is radar wavelength V r is platform speed R o is imaging range Usually use truncated Sinc function interpolation Sinc length 8-16
9 Raw Data Range Compression Matched filter in the azimuth dimension for each range Azimuth FFT RCMC Azimuth Compression Azimuth IFFT Image Product f o is the radar frequency c is the speed of light Notice the filter changes for each range, R Dependence on platform dynamics
10 Raw Data Range Compression Azimuth FFT RCMC Azimuth Compression Azimuth IFFT Complete processing with an azimuth inverse fast Fourier transform Repeat process along the range compressed data sequence Image Product
11 Modular SAR Processor (MSP) Implements the Range-Doppler Algorithm Each processing stage is executed on an intermediate binary file with an associated parameter file All polarisation combinations and look directions are processed separately Image Products Single Look Complex (SLC) 32bit floating point Multi Look Intensity (MLI) 32bit floating point Scaled raster 8bit integer
12 Left Side VV Left Side HH Left Side VH Left Side HV
13 Right Side VV Right Side HH Right Side VH Right Side HV
14 Motion Compensation (MoCom) Interpolates the range compressed data using navigation information from the platform Corrects for deviations from the reference platform track Corrects for mismatches in the data compared to that expected by the azimuth matched filter Sharpens the image focus
15 Scattering Matrix - S System model (receiver voltage) - L Variables are relative phase inside a range cell N is complex additive white Gausian noise Cross talk terms - Channel imbalance - Amplitude factors due to range to target and back as well as antenna pattern asymmetry - Need to estimate scattering calibration matrix parameters This formulation includes cross coupling between the various polarisation combinations due to antenna imperfections and system leakage
16 Polarimetric Active Radar Calibrators (PARCs) Fixed known Radar Cross Section - Combination of three gives response in all polarisation combinations Direct method for scattering calibration matrix parameters although not as simple as it appears
17 Triangular Trihedral Fixed known Radar Cross Section Gives response in co-polarised channels only Direct method for scattering calibration matrix parameters also non trivial
18 HV PARC 45 PARC 45 PARC VH PARC
19 Range-Doppler imaging algorithm focuses raw radar data Gamma RS is proprietary modular software implementing the range-doppler algorithm Motion compensation must be applied for sharp imagery Calibration is a non trivial stage in producing useful backscatter measurements
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