Dual-channel simultaneous transmitting and receiving type Doppler polarization weather radar

Abstract

The invention relates to a electronic instrument to detect cloud and precipitation particle in microwave remote sensing and measuring field. Wherein, dividing the large-power microwave signal from a transmitter into two paths to send with azimuth twisted-pair bale and pitch twisted-pair cable to antenna with one path through the phase shifter and another path through the large-power attenuator and emit out with a duplexer and horn; then, driving the horizontal and vertical polarization echo signal formed by back scattering of the target into horizontal and vertical receive channels to mix with preamplifier and mixer into MF signal and send to digital MF receiver and convert into digital signal; finally, sending the signal into signal processor connected to high-speed LAN to transmit information to user. This invention fills up the filed domestic blank and provides a new device for radar weather enterprise and disaster prevention and reduction.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing and telemetry, and is an electronic instrument used for cloud and precipitation particle detection. Background technique [0002] The weather radar uses clouds and precipitation as the observation objects. It emits electromagnetic waves to the target, receives its backscattered echo, and then studies the characteristics of the target according to the change of the echo. According to the scattering theory, the ratio of the backscattered echo to the transmitted wave of the target has both amplitude and phase information changes, and these changes reflect the differences of the target. Moreover, this change is different for polarized waves in different states. Conventional weather radars and Doppler weather radars generally emit only one state of polarized waves. Conventional weather radar can only obtain the intensity information of clouds and precipitation (Zh), and it can only o...

AI Technical Summary

Problems solved by technology

The mode of using high-power microwave switches to alternately realize dual polarization conversion has many disadvantages: 1. The sampling speed is slow, and it takes twice as long to collect the same amount of data as compared to simultaneous transmission; 2. The data accuracy is poor, mainly because the microwave switches used are ferrite Materials, whose performance is greatly affected by temperature; 3. Affected by the low isolation of microwave switches

The dual-channel isolation is low, which is also the reason for affecting the data accuracy; 4. φ dp 、K dp , ρ hV Affected by the Doppler effect, its accuracy will deteriorate

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