Millimetre-wave cloud radar system

Abstract

The invention discloses a millimetre-wave cloud radar system. The millimetre-wave cloud radar system comprises a digital signal processor, a frequency source, a transmitter, a first receiver, a secondreceiver and a circulator; the digital signal processor is respectively connected with the first receiver, the second receiver and the transmitter through the frequency source; the transmitter is connected with the input end of the circulator; the output end of the circulator is connected with the input end of the first receiver; and the output end of the first receiver and the output end of thesecond receiver are respectively connected with the digital signal processor. The millimetre-wave cloud radar system in the invention is a single-transmitting and double-receiving system, and has thecharacteristics of being small in volume and low in cost; the single-transmitting and double-receiving system has low channel isolation and balance requirement; the design and system adjusting and testing difficulty is low; and influence of parasitic channel interference on the system is reduced.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a millimeter-wave cloud measuring radar system. Background technique [0002] Compared with weather radar (X, C and S band radar), millimeter wave radar has the following characteristics in meteorological detection: [0003] (1) It has a strong ability to detect small particles (such as clouds, fog and sandstorms); [0004] (2) The Doppler effect is obvious, it has better Doppler speed resolution, and the speed measurement accuracy is higher; [0005] (3) A narrow beam can be obtained under a small antenna aperture, with good directivity and extremely high spatial resolution. [0006] However, the working frequency of millimeter-wave radar is higher than that of weather radar, and the technical requirements and equipment requirements are higher in the design and production commissioning of the transceiver system, resulting in higher costs. [0007] The traditional transmitter ad...

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Problems solved by technology

[0009] (1) Dual-channel transmission The transmission power of the same channel is half of the total power, the detection ability is reduced, and the system volume will also increase;

[0010] (2) Higher cost;

[0011] (3) The channel isolation and balance requirements are high, and the design is difficult

[0014] (1) There are many frequency points of combined frequency interference, which is easy to generate parasitic channel interference;

[0015] (2) In order to solve the interference of the mirror frequency in the parasitic channel interference, a higher IF frequency is required. The IF frequency makes the bandwidth of the IF filter with the same Q value larger and reduces the suppression ability of adjacent channels. Therefore, the higher IF frequency reduces the receiver selectivity

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