Solar radio frequency spectrograph receiving system and method

Abstract

The invention discloses a solar radio frequency spectrograph receiving system and method, and relates to the technical field of radio frequency spectrographs, the solar radio frequency spectrograph receiving system comprises a signal receiving unit, an analog receiver and a digital receiver, the signal receiving unit is used for receiving solar radio signals and adopts a large-aperture paraboloid reflecting surface and a dual-linear polarization feed source; the analog receiver is used for processing two analog channels of solar radio signals, and each analog channel comprises a radio frequency switch, a primary amplifier, a band-pass filter, a band elimination filter, a programmable attenuator, a secondary amplifier and an amplitude limiter which are connected in sequence; the digital receiver comprises an FPGA (Field Programmable Gate Array) and a data acquisition card, the amplitude limiter is connected with the FPGA through the data acquisition card, the programmable attenuator is connected with the FPGA through a line, and the FPGA starts the programmable attenuator when judging that solar radio burst meets a set condition. According to the invention, the large-aperture antenna system is adopted to improve the receiving quality of solar radio signals; program-controlled attenuation is added to realize system dynamic gain and expand the dynamic range of the receiving system; a frequency mixing scheme is not needed, the structure is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of radio spectrum analyzers, in particular to a receiving system and method for solar radio spectrum analyzers. Background technique [0002] A solar radio spectrum analyzer usually consists of an antenna and an antenna feeder system, an analog receiver, a digital receiver, and a host computer (terminal device). The existing solar radio spectrum analyzer usually adopts a frequency mixing scheme. For example, a signal receiving device of a solar radio spectrum instrument includes an indoor unit, an outdoor extension unit and a transmission cable. The outdoor extension unit includes a microwave switch, a limiter, a filter, and a low-noise amplifier. and control circuits; the frequency mixing scheme has many channels, high cost, and it is difficult to match the consistency between channels. [0003] The commonly used mixer structures mainly include fundamental wave mixing and subharmonic mixing. There may be ...

AI Technical Summary

Problems solved by technology

There may be local oscillator leakage in the fundamental wave mixing frequency. At the same time, if the balanced frequency mixing structure is used, the in-band clutter suppression is not good, and the output high-order clutter may be just on the sideband of the output frequency and cannot be filtered by the output filter. If it is dropped, it will have a great impact on the performance of the receiver

The local oscillator signals generally required for subharmonic mixing are 4 or 8 equally spaced signals of the same frequency, and their frequency is half that of the RF carrier signal. In order to generate these different local oscillator signals, it is necessary to design a complex phase filter , increasing the design difficulty

At the same time, phase filter components are generally passive devices. The more phases, the more components, and the power consumption will increase significantly, which is contrary to the principle of low power consumption design.

[0004] Moreover, the dynamic range of the analog receiving system of the current main metric-wave solar radio spectrometer is fixed. When the solar radio burst is very strong, on the one hand, it may cause damage to the subsequent digital receiver, and on the other hand, it cannot perform well. Observations are not conducive to the subsequent description, analysis and application of solar radio bursts

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