A basic block diagram for FMCW radar I will be using, modified MIT radar project: MIT block diagram I My transmit frequency is 2200-2600 MHz, my receive frequency is ~2200-2600. I want my IF frequency to be a constant 1 MHz (or 100 MHz; I haven't decided on bandwidth yet). The only way I can think of doing it is is introducing another VCO2 and having it produce constant 1 MHz RF signal, so it will mix with first filter, giving me LO 2201-2601 MHz. The LO is then mixed with receive frequency and I get a constant IF of 1 MHz.
Is there a better way to approach it? Introducing second VCO, second mixer and filter seems like too much.
EDIT: my specific question is about keeping IF constant, I put the whole block diagram just for illustration.