| With the development of communication theory and technology, antenna array playsmore and more important role in radio system like mobile communication, radio station,radar system, etc. The performance of array signal processing will directly affect theperformance of the entire communication system. The inconsistency of the channel ofantenna array parameters which include the amplitude and phase weakens performancethe array receiver system, so we must resolve the inconsistency of the channel of antennaarray. This dissertation deals with the array signal accepted by the circular antenna arrayto eliminate the error of each channel.The proposed calibration in the article is achieved over any frequency band, that itcan meet the calibration of the circular antenna array at any frequency. In the complicatedelectromagnetic environment that there are many signals, in the processing of calibration,various interference signals is present, like broadcasting signal, mobile signal, aviationsignal, etc, so there is representative to achieve the method of calibration in thecomplicated environment. The system is achieved by programming of LabVIEW. Usingthe FPGA module of LabVIEW to achieve the core part of the theory, and complete thedesign of system by state diagram to achieve the communication between host computerand slave system, and ensure the real-time. Because of the interference signal, theparameters probably exists error. The system is able to automatically determine whetherthere is strong interfering signal in the calibration frequency or adjacent frequency fromthe result of calibration. When strong interfering signal is present, do some processing toremove the influence, and make sure the result is correct.Matlab soft is used to simulate and analyze the result. There are two methods ofcalibration. Achieving the calibration by these two methods separately, and compare theresults of DOA (Direction of Arrive) to confirm the feasibility of the methods. |
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