Noiise figure degradation while using Sensitivity Time control ( In RADAR receiver)

Hi all,

I am designing an X band receiver and i am going to implement STC (using Digital Attenuators),

I needed to know if the Noise figure should be maintained at a better level even when when applying the STC.

Because when i apply 30dB STC attenuation my receiver noise figure is degraded to abount 25 dB.

I thought that i need to decrease the power level of the nearby sources of reflection only ,

is this the way to implement STC ?

should i distribute my 30 dB attenuation over three different Digital attenuators to improve my noise figure?

Because STC in radar is used to avoid the saturation of the receiver by close in reflected signals (ground or nearby objects), the attenuators should be place to the front-end. The system automatically reduce this attenuation when receive long distance signals.

Thank you for the reply