Abstract: The noise figure of radar receiver can affect the radar range directly, and it is an important technical parameter to scale radar receiver’s working capability. In view of the demands of the scene support equipment, a large dynamic logarithmic amplifier AD8310 is selected, and a delicated radar noise figure-measuring instrument is designed, Which can adapt to the large dynamic of radar receiver and the change of temperature in fields , and have been tried out on a radar support system of antiaircraft security successfully.

Key words: Radar receiver, Noise coefficient-measuring instrument