Hey srnet, thank you for suggesting the LORA transciever, will look more into it.
As for the project you asked, it is to map drone range from ground. Most modern radars rely on FMCW to process range but we are want to try pulse radar model as it is cost friendier.
Right now experimenting with HB100 doppler module, but that is one module out of many. Since it is doppler, only motion objects will be detected.
If you send 10 Ghz you only recieve back the same 10Ghz which goes through a mixer and bandpass filter and final output is the Intermediate Frequency, a small band something like 1-400 Hz.
If there is anything other than 0 than that is the doppler effect.
Now the idea here that we want to mod is if we pulse ON the transmit signal for 10 nanos and an object is detected, then it will echo return 10 nanos IF signal. Calculating the time between the beginning of the the transmit and recieve will solve the range.