Multichannel Data Receiver System

Abstract

In this paper we describe a variant of the construction of the multichannel data receiver system. It provides digital transformation and detection of 440 kHz input signals on the second intermediate frequency of analog front end receiver with sampling frequency of 1,25 MHz. Multichannel data receiver system performed as a board whose work is controlled by STM32 microcontroller and FPGA. FPGA is used as fast hardware interface for three independent analog to digital converters (ADCs) and primitive data processor for microcontroller. For conversion input signals from analog to digital form three fast sigma-delta 24-bit ADCs from Analog Devices were used. Analog drivers are used to provide good signal to noise ratio and range input signals. For signal processing a quadrature detection method is applied in digital form. We use Ethernet controller, as off-the-shelf solution, to provide an interface between our board and computer for sending transformed data. Such receiver systems may be used to search direction and to find radio signal sources with use of spectral-polarization method.