I am wondering if there is a general rule of thumb in the radar world for what frequency you should pick to detect targets of a certain size.
For instance, if one had two radars set up - one for detecting targets of 5cm and one for detecting targets of 500m - what frequencies would be best?
I understand that many more factors will go into this like surface roughness, etc but I would like to understand the rough relationship between carrier frequency and target size.
I found by Knott (The Radar Handbook, chapter 11)- "The echo characteristics depend in strong measure on the size and nature of the target surfaces exposed to the radar beam. The variation is small for electrically small targets (targets less than a wavelength in size) because the incident wavelength is too long to resolve target details."
So from this I understand that the more detail you want, the smaller the frequency should be. If anyone could elaborate I would be most grateful.