Help me understand this radar receiver

[nematollahi]

Hi every body
please help me to know more about this

The direct pulse from the transmitter and the echo pulse from the target are mixed in the receiver by a square law detector. The difference [beat] frequency (video) contains the target Doppler in the form of amplitude modulation of the envelope of the direct pulse. The sample video is doppler processed to reject stationary targets.

thanks a lot

 

[flatulent]

Re: radar receiver

In effect it is a direct conversion receiver using the transmitter signal source as the local oscillator. Stationary targets will produce a DC output which can be removed with a series capacitor. The moving target will produce an audio tone and the feedthrough of the local oscillator and returned signal are removed with a low pass filter.