Microwave subsystems applied for front-end of meteorological radar receiver

Abstract

This invention discloses a microwave subsystem for the front of the weather radar receiver, including low-noise amplifier, low-transmission lines, Superconducting band-pass filters, shielded boxes, micro-refrigerator and vacuum sealed envelope. The described superconducting band-pass filter and low noise amplifier is set in separate shielding boxes. Superconducting band-pass filter output is connected through coaxial microwave links to a low-noise amplifier input. A heat transfer plate is placed above the micro-refrigerator cold head. Superconducting band-pass filter and low-noise amplifier is placed in heat transfer plate. These devices are placed inside the vacuum sealed envelope. Superconducting band-pass filter input and low-noise amplifier output, through low-temperature cables, are connected to the coaxial microwave links connectors installed on the surface of the vacuum sealed envelope. This marked the reduction of the noise, and, because of the use of high-temperature superconducting narrow-band filter, meteorological radar's anti-jamming capability gets increase as 10, 000 times.

Description

technical field [0001] The invention belongs to the field of microwave engineering. Specifically, the invention relates to a microwave subsystem used for the front end of a weather radar receiver. technical background [0002] Weather radar is a family of radars used to detect the spatial location and status of meteorological objects. Its working principle is to intermittently transmit electromagnetic wave trains to meteorological targets in the air (such as atmospheric masses, clouds, precipitation particles, snow, ice crystals, etc.), and then receive the electromagnetic wave trains scattered back by the meteorological targets, and according to the characteristics of the echo signal To determine the spatial position, movement speed and other meteorological characteristics of the measured meteorological target. [0003] The main parameters measured by the weather radar are the distance r between the target and the radar, the azimuth and elevation angles of the target, the ...

AI Technical Summary

Problems solved by technology

[0025] Meteorological radar requires the filter to have a very narrow passband, which cannot be achieved by conventional filters, so the conventional weather radar has to cancel the filtering link at the front end, which greatly weakens the anti-jamming ability of the radar

In addition, due to the poor ability of the atmosphere to reflect electromagnetic waves, weather radar requires radar to have high sensitivity

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