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METHOD FOR PROCESSING RADIO FREQUENCY SIGNAL, SIGNAL PROCESSING DEVICE CARRYING OUT THE SAME, RADIO FREQUENCY FRONT END, RADIO RECEIVER, AND GNSS RECEIVER
METHOD FOR PROCESSING RADIO FREQUENCY SIGNAL, SIGNAL PROCESSING DEVICE CARRYING OUT THE SAME, RADIO FREQUENCY FRONT END, RADIO RECEIVER, AND GNSS RECEIVER
PROBLEM TO BE SOLVED: To provide a method for processing an input signal and a signal processing device for carrying out this method.SOLUTION: 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. In each case, depending 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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