HY-3001D radio altimeter adopts linear modulation coefficient to adapt to altitude change technology and echo signal narrow-band receiving technology, which improves the product's anti active interference ability; adopts coherent local oscillator mixing, which has superior anti same frequency asynchronous interference performance; adopts echo signal spectrum front detection technology, which improves the tracking accuracy; adopts series, standardization and modularization design On the basis of maintaining the closed-loop tracking system, the digital control technology, microwave integration technology and hybrid integration technology are adopted to realize the modularization of the product, have the silent function and improve the anti-interference ability of the product. It can be used for cruise missiles and UAVs to measure the height relative to the sea or the ground.