Research On Multi-channel Software Radio Receiver System Applied In Deep Space Detection

Deep space exploration is the research and exploration of space resources.The deep space exploration receiver is used to receive,process,store and forward the downlink signals from detectors,and the detector tracks can be determined by analyzing and processing these radio signals.The multi-channel receiver system can be used for multi-band observation and multi-target tracking,which has a great research significance.This paper introduces a deep space exploration receiver system,RSR-ARM,with a cas-caded structure.In this system,an ADC-based signal acquisition module,an FPGA-based signal processing module and an ARM-based system control module are introduced respec-tively.On this basis,an extended RSR-ARM scheme with four-channel Gigabit Ethernet port is proposed.In this scheme,the data transmission ability of the system can be extended to break the bottleneck of data transmission in the system.In the meanwhile,this extended system is compatible with the original RSR-ARM system,which means the original design can work on the extended system without modification,thus the design and debugging of the extended system is minimized.This function expansion module establishes the physical layer design based on 88E1111,which provides SFP optical module interface or RJ-45 cable interface to access physical media,and provides GMII or RGMII to access MAC layer.To implement the communication module,an 8 layer high-speed PCB of the module is designed.In addition,the data link layer of Gigabit Ethernet is designed in FPGA based on the V6EMAC IP core,and the processed data is transferred in this layer.In addition,the transmission capability of the module is tested,and the results show that each channel can achieve gigabit.A two analog input,eight digital output data processing system is designed which can be used in cross-band observation and multi-target tracking.By using Verilog language,a high speed data interface is built to solve two problems:the sampling data rate is higher than the clock of FPGA;and data between different channels is not synchronous.By constructing high speed parallel NCO,the system can implement the down-conversion of GS/s level data.In addition,the system can provide data output in various speed levels.These modules have strong flexibility due to the programmable interface.This paper also introduces the remote control software system with B/S structure in ARM,which is established in Linux operating system.The control software system is divided into three parts according to its function:driver layer provides transmission interface between hardware and software;service layer analyzes instructions and controls the hardware;client layer provides a user interface.In addition,the Gigabit Ethernet data storage is implemented in the Visual Studio development environment with C language.The data storage is separated from the control software system,which can reduce the workload of the system.The system performance is tested under different conditions,including different media interfaces,media independent interfaces and in the dual channel mode.The test results show that the system can meet the predetermined requirements.