Low frequency ultra wideband receiver system

Abstract

The invention provides a low frequency ultra wideband receiver system, comprising a front-end circuit system, an analog-to-digital conversion circuit system and a telescope digital operation board. The front end circuit system comprises a primary processing module, a secondary processing module and a clock module. The primary processing module is used for amplifying and mixing radio frequency signals to generate intermediate frequency signals. The secondary processing module is used for extracting passband signals of corresponding frequency bands in the intermediate frequency signals accordingto an instruction, so the analog-to-digital conversion circuit system processes the passband signals. The clock module is used for providing a clock for the analog-to-digital conversion circuit system. The analog-to-digital conversion circuit system is used for converting the intermediate frequency passband signals into digital signals. The telescope digital operation board comprises a pluralityof FPGA mother boards, an AD sub-board and a tail board and is used for carrying out multilevel DDC, PFB, FFT and FIR parallel filtering on the digital signals of the analog-to-digital conversion circuit system. According to the system, coverage bandwidths are relatively wide, the flexibility is high, and the precision is high. Through combination of DDC, PFB, FFT and FIR, the relatively good frequency resolution on FPGAs of the same level is realized.

Description

technical field [0001] The invention relates to the field of astronomy, and more specifically, to a low-frequency ultra-wideband receiver system. Background technique [0002] Ultra-wideband receivers and phase array receivers will become two major directions for the development of future receivers. At the same time, ultra-wideband technology has the most stringent requirements on software, hardware and firmware design and technical requirements in receivers, and is a challenging exploratory scientific research instrument. In the last five years, with the development of semiconductor technology (such as ultra-high-speed and high-precision analog-to-digital conversion chips) and the improvement of real-time computing capabilities of high-speed, large-data chips (such as faster field programmable arrays), the telescope has gradually met Wide bandwidth requirements. As a result, it becomes possible to gradually cover the entire available frequency range of the telescope with ...

AI Technical Summary

Problems solved by technology

[0003] However, the existing receiving system has narrow coverage bandwidth, low flexibility, and low precision, and the external transmission bandwidth of ROACH2 in the existing receiving system is relatively low, so real-time transmission is still difficult to achieve

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