Radio frequency direct acquisition broadband digital receiver system and method and radio observation system

Abstract

The invention provides a radio frequency direct acquisition broadband digital receiver system and method and a radio observation system. The receiver system comprises an FPGA processing unit, a clockmodule and at least two ADC conversion modules,. The FPGA processing unit is connected with each ADC conversion module, and the clock module is connected with the ADC conversion modules and the FPGA processing unit. The FPGA processing unit is configured to be used for setting the signal bandwidth range of each input channel of the ADC conversion module, so that the signal bandwidth ranges of allthe channels are larger than the signal bandwidth range of each channel after being superposed. Signal acquisition is carried out in a radio frequency direct acquisition mode. The same clock module isarranged between the FPGA processing unit and the ADC conversion module. Expansion of the ADC conversion modules and signal superposition of input channels of the ADC conversion modules can be realized, the number of the ADC conversion modules is expanded according to the required signal bandwidth range, the bandwidth range of receivable signals of the digital receiver is directly improved, and the expansion mode is simple and effective.

Description

technical field [0001] The present disclosure relates to the related technical field of radio astronomy observation equipment, and specifically relates to a radio frequency direct acquisition broadband digital receiver system, method and radio observation system, which can be used for solar radio observation. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] At present, receiver systems for high-frequency radio astronomy observations include: analog superheterodyne down-conversion combined with low-IF sampling digital receivers, channelized digital receivers, compressed sampling digital receivers, and single-bit sampling digital receivers. receivers and alternate sampling digital receivers, etc. The inventors found that although these receivers expand the bandwidth of the acquisition system, they all have certain problems. Analog superhe...

AI Technical Summary

Problems solved by technology

The single-bit sampling digital receiver has loss in amplitude and phase, and the two-tone dynamic of the system is low

The digital receiver that uses multiple ADCs to sample in parallel and time alternately greatly increases the sampling rate, but the analog bandwidth of the ADC device becomes its limiting factor. At the same time, due to the difference in response between parallel channels and the difference in sampling clocks between channels, Unavoidable non-uniform errors leading to parallel sampling

[0004] In short, in view of the high-frequency radio astronomy observations' requirements for receiver system sampling and large bandwidth, the current receiver has problems such as large and complex systems, limited signal requirements, and serious signal distortion.

Moreover, due to the weak electromagnetic wave energy of solar radiation, when dealing with high-frequency solar radio signals, traditional solar radio observation receivers often use the signal down-frequency processing and then input it into the digital receiver. Multiple external noises interfere with the system's processing of solar radio signals

Images