HY-3001m radio altimeter is a radar altimeter designed for rainbow XX UAV in a certain hospital. It is widely used for UAV to measure the altitude of relative sea surface or ground. HY-3001m radio altimeter adopts linear modulation coefficient to adapt to height change technology and narrow-band receiving technology of echo signal, which improves the anti active interference capability of the product; it adopts coherent local vibration mixing, which has superior anti synchronous interference performance; adopts the front-edge detection technology of echo signal spectrum to improve tracking accuracy; adopts three-dimensional design of serialization, standardization and modularization The product is of good inheritance and mature reliability. On the basis of keeping the closed-loop tracking system, digital control technology, microwave integration technology and hybrid integration technology are adopted to realize the modularization of the product. The receiver adopts double filter to improve the anti-interference capability of the product.