High-frequency microwave radiometer for atmospheric wet path delay correction

Abstract

The invention discloses a high-frequency microwave radiometer for atmospheric wet path delay correction. The high-frequency microwave radiometer is used for realizing detection of land / ocean wide atmospheric path delay signals and comprises an antenna unit, a receiver unit, six intermediate frequency units and a numerical control unit, wherein the antenna unit is used for acquiring land / ocean radiation signals and feeding the signals into the receiver unit through polarization separation, the receiver unit is used for separating the received polarization signals to obtain vertically polarized and horizontally polarized 75GHz, 89GHz and 119 GHz radiation signals, and outputting signals with set frequency and bandwidth to the corresponding intermediate frequency units through low noise amplification, frequency mixing and amplification respectively, the intermediate frequency units are used for outputting voltage signals with the amplitude linearly related to the powers of the intermediate frequency signals and synchronously transmitting to the numerical control unit, and the numerical control unit is used for acquiring the received voltage signal, outputting a control signal to the receiver unit and the antenna unit, and carrying out data transmission and communication with a satellite system.

Description

technical field [0001] The invention relates to the fields of microwave remote sensing instruments and atmospheric humidity correction, in particular to a high-frequency microwave radiometer used for atmospheric humidity path delay correction. Background technique [0002] At present, microwave radiometers are used for atmospheric path delay correction, and the radiometer frequencies are usually around 23.8 and 37.0 GHz, which are used to measure the influence of atmospheric water vapor and liquid water. To add correction for the effect of sea surface winds, microwave radiometers need to include 18.7 GHz. Prior art calibration radiometers for these three frequency combinations such as figure 1 As shown, it consists of a power supply unit, a numerical control unit, an antenna and a receiver unit. It obtains ocean radiation signals through a pair of parabolic antennas fixedly pointing to the nadir point, and realizes one-time observation of cold air, heat sources and earth t...

AI Technical Summary

Problems solved by technology

However, it is difficult for the existing calibration radiometer to realize the rotary scanning method of cross-orbit scanning, and at the same time, it will cause certain disturbances to the attitude of the satellite platform, which will lead to a decline in the observation capability of the wide-format altimeter

Therefore, the measurement of the wide atmospheric path delay at the same distance as the satellite altimeter cannot be realized only by the current calibration radiometer

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