AWR1642: Does the receivers of AWR1642 have automatic gain control?

Hi,

I am using AWR1642 and DCA1000 to capture some radar data. After plotting the figure of received signals (A-t), I found the amplitudes of different received signals are almost about 4.63e14. Even though there is only one weak reflection object in front of radar, the amplitude of received signal is approximatedly same. So does the receiver have automatic gain control? Why there isn't anything introduction about this in awr1642's documents?

Thanks,

William