I'm working with Venusian Magellan radar, and I need to convert the pixels from DN values into radar backscatter coefficients (Sigma-naught). I attempted to use the Radar Calibration Function, but it would seem that the particular function only works for RADARSAT-2 data. I encountered the following error: "The function could not be inserted. The input or output arguments are invalid."
I was wondering if anyone else has devised a way to convert radar DN pixels into backscatter through other methods.
The equation I require, specifically for Magellan data, is as follows:
Sigma Nought = 100.1[–20+(DN–1)/5]*[(0.0118 cos(phi+0.5))/[sin(phi+0.5)+0.111 cos(phi+0.5)]^3]
where phi is the incidence angle, dependent on latitude, but ultimately will be sourced from a table.