Rapid calibration radio telescope receiver and calibration method

Abstract

The invention relates to a fast and efficient radio telescope receiver and a fast calibration method based on the receiver. The local oscillator frequency of a radio frequency agile receiver is switched to bilaterally symmetrical frequency points f0+ / -deltaf with the observation center frequency f0 as the center with fully programmable system-on-chip software, and an average value of the output power is taken as the noise power P'sys of a system at the f0; the local oscillator frequency of the receiver is switched back to the f0, an input end of the receiver is short-circuited, the input is subjected to zero setting, and the output is used as the noise output power P'rec of the receiver; white noises with the power of Pcal are injected at the input end of the receiver, if the output powerof the receiver is P'cal, then the following formula is marked as a gain coefficient; and when the telescope and the radio frequency agile receiver are used for observing a radio source with the center frequency of f0, if the output power of the receiver is P'x, the input power of a calibrated radio telescope is as the following formula. The radio telescope receiver and the calibration method provided by the invention realize fast and accurate calibration and improve the utilization efficiency of the telescope.

Description

technical field [0001] The invention relates to a fast and efficient radio telescope receiver and a fast calibration method based on the receiver, belonging to the technical field of instruments and meters. technical background [0002] Collect and measure the radio signals emitted by celestial bodies (radio sources) through large radio telescopes, and then infer basic information such as the basic material composition and radiation excitation temperature of these radio sources, the velocity field in the movement area of ​​example density matter, and the magnetic induction intensity. important in physics research. The basis of the above research is the precise quantitative analysis of the spectrum of the radio signal obtained by the telescope. [0003] However, in actual measurement, different radio telescopes / receivers have different effective receiving areas, receiver sensitivities and noise levels, and the electromagnetic radiation intensity obtained when observing the s...

AI Technical Summary

Problems solved by technology

The traditional calibration method needs to replace the local oscillator and filter equipment frequently, and compensate the impact of different local oscillators, filters, and changes in physical quantities such as receiving area, temperature, and pitch angle through nonlinear models, which is a cumbersome and time-consuming process. the process of

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