# Radar video signal and matched filtering

In order to make my question more clear and give more details I'm trying to understand the processing signal procedure in radars,i understood till this moment that a transmitter generates a signal called transmitted signal with a center frequency and then when this signal meets a target an echo signal reflected to radar and captured with a received stage including many RF and non RF components.After amplification and noise rejection with LNA a mixer is used to melange received and transmitted signal to produce a signal called video signal and then the signal processing stage take place. My question are : can anyone explain me what's the role of the matched filter in radar signal processing stage what are the alternatives methods?

• Radar receiver produces a video signal that is then processed further in a signal processing stage? Are you using the correct English terminology or are you mis-translating something that you read in another language? – Dilip Sarwate Jul 18 '18 at 1:15

As the signal propagates from transmitter, the power that impinges on the target is proportional to $1/r_{target}^2$. The reflected energy back to the transmitter is also proportional to $1/r^2$, so the received energy is proportional to $1/r^4$.