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A method of processing a radio frequency signal, a signal processing device for carrying out the method, a radio frequency front-end, a radio receiver and a GNSS receiver
A method of processing a radio frequency signal, a signal processing device for carrying out the method, a radio frequency front-end, a radio receiver and a GNSS receiver
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机译:处理射频信号的方法,用于执行该方法的信号处理设备,射频前端,无线电接收机和GNSS接收机
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摘要
A radio frequency signal is frequency-translated to form a complex first intermediate signal where a frequency corresponding to a GPS centre frequency is at an intermediate frequency. In a multiplexing conversion unit (4) a complex multiplexed conversion signal which assumes different conversion frequencies is derived from a clock signal where the frequency of the latter is divided alternately by one of two divisors in a divider circuit (14) and further by 2 in a phase shifter (15). The conversion signal is mixed with the first intermediate signal in a conversion mixer (16) to provide a multiplexed second intermediate signal where, depending in each case on the conversion frequency, a frequency corresponding to a GLONASS centre frequency and a frequency corresponding to a BeiDou centre frequency are alternately shifted close to the intermediate frequency. The first intermediate signal and the second intermediate signal are then processed in a baseband unit.
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