METHODS OF PROCESSING A RADIO FREQUENCY SIGNAL, SIGNAL PROCESSING DEVICES FOR CARRYING OUT THE METHODS, RADIO FREQUENCY FRONT-ENDS, RADIO RECEIVERS AND GNSS RECEIVERS

摘要

A radio frequency signal is frequency-translated to form a complex first intermediate signal where a frequency corresponding to a GPS center frequency is at an intermediate frequency. In a multiplexing conversion unit 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 and further by two in a phase shifter. The conversion signal is mixed with the first intermediate signal in a conversion mixer to provide a multiplexed second intermediate signal where, depending in each case on the conversion frequency, a frequency corresponding to a GLONASS center frequency and a frequency corresponding to a BeiDou center 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.

主权项

1. A method of processing a radio frequency signal, the method comprising:
deriving, from the radio frequency signal, an analog first intermediate signal by frequency translating the radio frequency signal by mixing the radio frequency signal with a frequency translation signal, and deriving, from the first intermediate signal, a multiplexed second intermediate signal by mixing the first intermediate signal with a conversion signal which alternately assumes a plurality of conversion frequencies, where portions of the conversion signal having the same conversion frequency are phase coherent with respect to one another.