HY-2001 altimeter is a new generation of radar altimeter designed for a small missile aircraft. It is a small full-function radio altimeter in line with aerospace standards. It is a key component for longitudinal height channel control. It can be widely used in cruise missiles and UAVs to measure the height relative to the sea or the ground. HY-2001 adopts linear modulation coefficient to adapt to height 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, modularization and other three design, which has good product inheritance Based on the closed-loop tracking system, digital control technology, microwave integration technology and hybrid integration technology are adopted to realize the miniaturization of products.