Low-frequency radio astronomy observatory for cancelling electric field noise by utilizing auxiliary antenna

Abstract

The invention discloses a low-frequency radio astronomy observatory for cancelling the electric field noise by utilizing an auxiliary antenna. The low-frequency radio astronomy observatory comprises areceiving antenna, an auxiliary antenna, a multi-channel pre-amplifier and an electronics unit; the receiving antenna is used for receiving a low-frequency radio astronomy electric field signal; theauxiliary antenna is shorter than the receiving antenna, and used for receiving a low-frequency noise signal; the multi-channel pre-amplifier is used for amplifying and outputting the low-frequency radio astronomy electric field signal and the low-frequency noise signal; and the electronics unit is used for amplifying and reversing the low-frequency noise signal, and then, superposing the low-frequency noise signal with the low-frequency radio astronomy electric field signal. According to the low-frequency radio astronomy observatory in the invention, an auxiliary antenna is increased; the low-frequency noise signal of a satellite platform received by utilization of the auxiliary antenna is reversed and amplified, and then, superposed with the received signal of a low-frequency receiving antenna; therefore, the low-frequency interference noise signal of the satellite platform received by the low-frequency receiving antenna can be cancelled; and the signal to noise ratio of a received signal is effectively increased.

Description

technical field [0001] The invention belongs to the technical field of satellite-borne low-frequency radio astronomy signal detection, and in particular relates to a low-frequency radio astronomy observer using an auxiliary antenna to eliminate electric field noise. Background technique [0002] The origin and evolution of cosmic celestial bodies is one of the basic problems in natural science, which can be explored by using radio telescopes in the radio wave band. Precise measurements of radio signals from the sun, planets, and other cosmic bodies at low-frequency radio wavelengths can make unique contributions to exploring these questions. In ground-based radio observations, the earth's ionosphere and magnetosphere plasma absorb and block outer space electromagnetic waves with a frequency lower than 20MHz, making it difficult for electromagnetic waves with a frequency lower than 5MHz in space to pass through the earth's ionosphere in almost any time period and region. Rea...

AI Technical Summary

Problems solved by technology

[0005] The low-frequency receiving antenna used to detect low-frequency radio astronomy signals in space is installed on the satellite platform, and other electronic equipment on the satellite platform will also continuously emit low-frequency electric field noise, which will cause great interference to low-frequency radio signals, or even completely The low-frequency radio signals flooding the space bring great difficulties to the detection and processing of space low-frequency radio astronomy signals

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