Digital correlator and digital complete-polarization microwave radiometer

Abstract

The invention relates to a digital correlator. The digital correlator comprises a sampling module, a multiplexing module, a correlation calculation module, a synchronous sampling clock module and a synchronous control module, wherein the sampling module is realized by adopting an analog-digital converter with the sampling rate being equal to or higher than 5GHz; the multiplexing module, the correlation calculation module and the synchronous control module are realized on an FPGA chip with the main frequency being higher than 400MHz; different sampling units in the sampling module are used for carrying out high-speed sampling on external input signals respectively and obtaining two paths of digital signals which are input into the correlation calculation module after being multiplexed by the multiplexing module; the correlation calculation module is used for carrying out speed reduction and correlation calculation on inputted digital signals; the synchronous sampling clock module is used for ensuring consistent phase of sampling clocks reaching the different sampling units in the sampling module, and the synchronous control module is used for controlling synchronous working among the different sampling units in the sampling module.

Description

technical field [0001] The invention relates to the field of microwave radiation, in particular to a digital correlator and a digital full-polarization microwave radiometer. Background technique [0002] Based on the traditional microwave radiometer, the full polarization microwave radiometer further extracts the Stokes polarization information of the observation target. It is a new type of microwave remote sensor developed in the middle and late 1890s in the world. Research hotspots in Europe and other countries and regions. The full-polarization microwave radiometer can obtain the global large-area wind field results in a short time, and at the same time, it can also obtain parameters such as atmospheric cloud water content, water vapor content and sea surface temperature, which is quite beneficial to ocean and climate research, and is also conducive to improving the atmosphere. and the accuracy of ocean forecast models. The research on the digital correlator, which is t...

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Problems solved by technology

The disadvantage of this technology is that the overall system of electronic circuit construction is bulky, the power consumption exceeds 100 watts, and the sampling rate is greatly limited by the subsequent combination circuit.

[0010] The bandwidth of the above-mentioned digital correlators realized in the prior art is all limited within 2GHz, and the intermediate frequency bandwidth of the fully polarized microwave radiometer above the Ka band is equal to or higher than 2GHz, and the digital correlators in the prior art cannot meet the requirements. The need for such fully polarimetric microwave radiometers

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