Radio signal receiver with device for calibrating multi-way signal effect and method for starting receiver
A radio frequency signal and receiver technology, applied in the field of starting or setting the receiver, correcting multipath signal effect, GPS type field, can solve the problems of complexity and high energy consumption, and achieve the effect of avoiding calculation errors
Inactive Publication Date: 2003-01-15
ASULAB SA
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The complexity also leads to high energy consumption, which prevents the integration of such receivers on small-sized portable objects with low-capacity energy sources
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[0046] In the following description, some components of a radio frequency signal receiver, in particular a GPS type receiver, are mentioned only in a simplified manner, which components are well known to a person skilled in the art. The receiver described herein is preferably a GPS receiver. It can however be used in GLONASS or GALILEO navigation systems or any other navigation system, or in a mobile phone network.
[0047] As shown in FIG. 1, the radio frequency signals SV1 to SV4 received by the antenna 2 of the GPS receiver are transmitted by four visible satellites S1 to S4. The signals SV1 to SV4 of these four satellites are necessary for the above-mentioned GPS receiver 1 in order to be able to extract all the information used to calculate its position, velocity and / or time-related data. However, some radio frequency signals SV1' and SV3' may be reflected by various obstacles, such as buildings B, on their paths. These deviated signals SV1' and SV3' may corrupt the det...
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The receiver for radio-frequency signals, modulated by specific codes of transmitting sources, such as satellites, includes receiving and shaping means with frequency conversion for the radio-frequency signals for generating intermediate signals, a correlation stage formed of several correlation channels for receiving the intermediate signals and microprocessor means connected to the correlation stage in order to process the extracted data after correlation. Each channel includes a correlator in which the intermediate signals are correlated with at least two early and late replicas of the specific code of a visible transmitting source to be searched and tracked. The correlator further includes integration means for the correlated signals to provide a first amplitude value of the auto-correlation function of the early signals and a second amplitude value for the late signals. When multipath signals are detected in the first operating channel, at least a second unused channel is configured, via the microprocessor means, and connected in parallel to the first channel. The second channel has the task of searching the maximum amplitude value between the two amplitude values of the first operating channel. The receiver, in particular of the GPS type, can be mounted in the case of a watch and powered by the energy accumulator or battery of said watch.
Description
technical field [0001] The invention relates to radio frequency signal receivers, in particular of the GPS type, with means for correcting the effects of multipath signals. The invention also relates to a method for starting or setting up the operation of the receiver. Background technique [0002] Receivers for radio frequency signals modulated by a source-specific code contain receiving and shaping means. These devices allow frequency conversion of radio frequency signals to provide intermediate signals. [0003] The receiver also contains a correlation stage consisting of several correlation channels for receiving intermediate signals. Each channel has a correlator in which the intermediate signals are correlated. When the channel is being used, correlation is achieved by at least one control loop of the correlator with at least two replicas of the specific code of the visible transmission source to be searched for and tracked, the replicas being always in phase. The ...
Claims
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IPC IPC(8): G01S1/00G01S19/14G01S19/22G01S19/30G01S19/34G01S19/37H04B1/10H04B1/707H04B7/155H04B7/204
CPCG01S19/22H04B1/1081G01S19/30G01S19/14G01S19/34G01S19/37H04B7/204
Inventor Y·奥斯奇A·蒙特尔德P·-A·法林
Owner ASULAB SA