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METHOD OF, RADIO TERMINAL FOR, DETECTING THE PRESENCE OF A 2-FSK SIGNAL, AND A TELEMETRY MODULE
METHOD OF, RADIO TERMINAL FOR, DETECTING THE PRESENCE OF A 2-FSK SIGNAL, AND A TELEMETRY MODULE
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机译:无线电终端,用于检测2-FSK信号和遥测模块的方法
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摘要
A method of, and terminal for, detecting the presence of a 2-FSK signal, the method comprising receiving (10) a 2-FSK signal, quadrature frequency down-converting (34,35,36) the received signal to produce quadrature related outputs, oversampling (42,43) the quadrature related outputs to produce digital samples, differentially decoding (44) the digital samples to produce real and imaginary components, integrating (56,58) the imaginary components and comparing (26) the integrated value with a fixed threshold value (24) and determining a signal to be present if the threshold is exceeded.
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