Methods of processing a radio frequency signal, signal processing devices for carrying out the methods, radio frequency front-ends, radio receivers and gnss receivers
A radio frequency signal and signal technology, applied in the fields of processing radio frequency signals, implementing signal processing devices, radio frequency front-ends, radio receivers and GNSS receivers, can solve problems such as the inability to maintain the phase coherence of intermediate signals
Active Publication Date: 2014-07-02
U-BLOX
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Also because the part of the intermediate signal associated with a given satellite is separated by the intermediate signal insertion part belonging to other satellites whose signals are frequency converted at a different frequency, phase coherence between these parts of the intermediate signal cannot be maintained
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[0019] The general method of the present invention includes frequency conversion of a radio frequency signal capable of producing a first intermediate signal. By mixing this first intermediate signal with a multiplexed transition signal comprising successive parts in which the signal has in any case a fixed transition frequency, a multiplexed second intermediate signal can be derived. Certain conversions can be alternatively picked out from some of the conversion frequencies used for the frequency shift of the above conversion signal and a specific frequency band of the first intermediate signal corresponding to the useful frequency band in the radio frequency signal and close to the fixed intermediate frequency or its negative frequency Frequency so that signals contained in frequency bands can be selectively processed in a similar manner.
[0020] For the processing of signals contained in a certain frequency band of radio frequency signals that are finally frequency-shifted...
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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 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 and further by two in a phase shifter. The conversion signal is mixed with the first intermediate signal in a conversion mixer16 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.
Description
technical field [0001] The invention relates to a method of processing an input signal, a signal processing device implementing the method, a radio frequency front end of a radio receiver provided with such a signal processing device and a radio receiver provided with such a radio frequency front end. The present invention also specially designs a global navigation satellite system (Global Navigation Satellite System, GNSS) receiver. Background technique [0002] A signal processing method, a signal processing device, a front end and a general form of a GNSS receiver are known from eg European patent application publication number EP1983351A1. The method and device are suitable for processing signals limited to fixed frequency bands, such as GPS signals as superimposed signals usually transmitted by satellites belonging to the Global Positioning System (GPS). However, relying on GPS signals alone is insufficient to determine a receiver position with expected reliability and...
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IPC IPC(8): G01S19/37G01S19/36H04B1/16
CPCG01S19/33H04J3/02G01S19/36
Inventor 托马斯·布劳纳
Owner U-BLOX