A Highly Sensitive Radar Velocimeter

Abstract

The invention relates to the technical field of radar current meters, and discloses a high-sensitivity radar current meter, comprising an upper casing, the bottom of the upper casing is provided with a lower casing, and the inside of the lower casing is provided with a cavity , the inner wall of the lower casing is fixedly connected with a mounting seat, the inside of the lower casing is fixedly connected with a fixed plate, the lower casing is fixedly installed with a mounting plate, and the surface of the mounting plate is fixedly installed with an information processing A unit, the information processing unit is used to process the signal wave reflected by the water surface to extract the Doppler frequency shift. On the basis of the existing single-chip microwave integrated circuit, adding a mixer at the transmitting output and receiving output can separate the two Doppler signals, thereby increasing the frequency of the receiving output signal of the single-chip microwave integrated circuit and improving The overall sensitivity of the radar to the flow rate is improved, so that the detected signal can be more accurate and stable regardless of the state of high flow rate or low flow rate.

Description

technical field [0001] The invention relates to the technical field of radar current meters, in particular to a highly sensitive radar current meter. Background technique [0002] The radar current meter is a flow measurement instrument using microwave technology, which is specially used for monitoring the surface flow velocity of natural rivers, canals / culverts / pipes and other water flow fluctuations. The speed of water flow can realize non-contact and unmanned automatic monitoring in the fields of hydrology, water conservancy, agricultural irrigation, water supply and drainage. With the development of microwave integrated circuit technology, single-chip microwave integrated circuits have begun to be widely used in the field of radar. Single-chip microwave The receiving channel in integrated circuits usually adopts a zero-IF structure. [0003] Chinese Patent No. CN201910816178.6 discloses a method, device, device and storage medium for measuring water level and flow veloc...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a high-sensitivity radar current meter, which solves the problems of the existing radar current meter in the low flow detection process due to the high 1 / f noise level in the low frequency band. The sensitivity has a great impact and the monitoring data is inaccurate

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