A channel configurable radio astronomy radiometer based on mmic microwave detection chip

Abstract

A channel configurable type radio astronomy radiometer based on an MMIC microwave radio detection chip is formed by sequential connection of a power divider, an analog filter, a microwave switch, a microwave amplifier, a step attenuator, a secondary power divider, a commercial spectrometer, a radio detector, a multi-channel acquisition card and a terminal computer, wherein a digital control card is further arranged on the terminal computer. According to the radiometer, gating and configuration of different observation band widths are achieved through the control of the microwave switch, gain is controlled by controlling a gain controllable type radio-frequency amplifier to ensure that the input power of the radio detection chip to be within a certain range, and the influence of temperature on equipment can be reduced based on the low-temperature-offset wide-dynamic-range radio detection chip to guarantee the stability of observation data; finally, analog-digital conversion is conducted through the NI9215 data acquisition card at a rate as high as 100 Ksps, and observation at any integral time can be realized after sampling.

Description

technical field [0001] The invention relates to a radio astronomy broadband radiometer system based on under-sampling, which is applicable to the technical field of new structures of radio astronomy observation devices. Background technique [0002] In radio astronomy observation, directly detecting the change of the total flow of the observed celestial body is the most direct and effective way to know the change of the celestial body target. Compared with other indirect methods, it can better reflect the real situation of celestial body activities, so the reliability is higher; through its flow change The law, the establishment of a theoretical model can understand the radiation mechanism and internal physics of radio sources (for example, the physical scale of radio sources can be estimated from the characteristic time scale to give the upper limit of its angular radius). [0003] Microwave radiometer is an important tool for total flow, and its important indicators includ...

AI Technical Summary

Problems solved by technology

[0019] A radio astronomy radiometer with configurable channel bandwidth based on MMIC microwave detection chip mainly solves the problem of sensitivity loss caused by different interference-free observation bandwidths in different sky areas, and uses advanced low-temperature drift detection chips to replace traditional detection diodes for power- —Voltage conversion, with the advantages of long stabilization time, high dynamic range, high sensitivity, etc.

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