1. Surface Based Sounding SAR Update May 3, 2006

2. PRISM SAR Radar system installed on Tucker Sno-Cat at Summit, Greenland

3. Legend Radar platform traverse lines GISP2 core site (72.576º N, 38.465º W) GRIP core site (72.578º N, 37.637º W) Ice Thickness and Bed Slope Ice Thickness Map of GISP2 and GRIP Ice Core Sites Bedrock Slope Map of GISP2 and GRIP Ice Core Sites

4. Radar Depth Sounder Bedrock echo

5. Issues 1.Internal layers are a good source for in situ calibration which I have used to provide improved phase and amplitude matching. Potentially can be used to verify/improve focusing during SAR procedure? 2.The lack of surface roughness in some areas will prevent any feasible system from building a SAR image. If it hasn't already been done, I recommend verifying with old RDS measurements that the region being flown for testing will have a good SNR and is not flat/specular like NGRIP. 3.Some areas, like Summit, are so rough that layover can be a major issue due to the small angles of incidence that we are required to use. 4.Flying repeat passes in an aircraft is difficult. I would be curious to know how JPL or Vexcel is going to handle a widely varying baseline. 5.PRF? What is the minimum along track sampling that your processor likes to have? 6.Dielectric errors 7.Antenna pattern (5-element transmit array)