Analysis Of Digital Real-time For Aperture Synthesis Radiometer

Under Imaging System of the Distributed synthetic Aperture Millimeter-Wave, toachieve an high angular resolution the number of antennas will increase, it would take along time for the in imaging system to process the information received by its antennas,The increase in the antenna lead to the number of signal processing devices into exponential growth。This makes the already complex system becomes more complex; in order to solve the problem ofcomplex simulation system devices.The digital system gradually replaced the analog systems. So thecomplexity of the system devices shift complex signal processing. Digital synthetic aperturemicrowave radiometer system to improve sensitivity by increasing the bandwidth or integration time ofthe equivalent system。Then the amount of data in a single measurement will be the rapid growth.when the system of distributed synthetic aperture micro-wave become Digital fromAnalog, the character of the analog system will disappear as the system convert intodigital system, Signal real-time processing refers to the response system must be able torespond to external signals, Response time is less than or slightly greater than the time ittakes to control the issue of external signals that device.Real-time processing of digital synthetic aperture microwave radiometer signaldepends on the system to complete the processing of the signal multiplexing.While thedigital multiplex relevant depends on quantified the number of bits of analog signals andrelated devices. Therefore, this thesis research under the existing conditions how the bestway to achieve real-time processing of the signal.The paper first describes the development and research of multiple correlation devicein the digital synthetic aperture microwave radiometer, And proposed signal processingscheme, On this basis, a detailed analysis of key technologies of signal processing in realtime using DSP (Digital Signal Processor) and FPGA (field programmable logic devices).Finally, the FPGA with DSP core program through the different options proposed finalsignal real-time processing. In this approach, in order to achieve signal processing in realtime, this paper is the DSP core to complete the operation rather than by the logical unitcombination operator, Therefore, the main consideration in the case of the existing conditions and the high-speed sampling rate of the FPGA in real-time processing usingDSP nuclear signal.How to achieve the real-time processing of the signal containing theDSP core in the FPGA. First analysis of sampling rate lower than the operating frequencyof the FPGA signals in real time processing. The study showed that in this case the systemcan achieve real-time signal processing. Followed by analysis to complete the real-timeprocessing of the signal when the sampling rate is higher than the operating frequency ofthe FPGA, The study showed that in this case the system can achieve real-time signalprocessing.