OBCT

I understand how the doppler effect works and I'm trying to work out the speed of an object traveling at 50 k/ph (assuming I don't know it's speed of course) If I were to use a radar and send a lightwave at the object at about 10.6 GHz and found the returning signal to be 1075 Hz higher than the original, how would I work out the speed? The speed and frequencies were chosen at random, any numbers will do, I'm just trying to understand the formula used. Also, does the speed of the earth effect the result? Any help would be greatly appreciated. Thanks