Fast Fourier Transform (FFT) inter frequency loss mitigation and Global Positioning System (GPS) receiver including it
First Claim
Patent Images
1. A method of using a receiver for acquiring positioning signals of a geographic localization system, comprising the steps of:
- obtaining a positioning signal of the geographic localization system containing localization information;
combining the positioning signal with a local pseudorandom code sequence obtaining a correlation signal;
obtaining a first spectrum of frequency of the correlation signal;
obtaining a second spectrum comprising intermediate-frequency data by complex combinations of amplitude and phase values of adjacent bins of the first spectrum; and
searching for peaks in the second spectrum for use in providing pseudo-ranges and fixes in space and time by said receiver.
2 Assignments
0 Petitions
Accused Products
Abstract
Acquisition method for a localization receiver, in particular for a Global Positioning System (GPS) receiver. It involves the calculation of an interpolated Fast Fourier Transform (FFT) spectrum (S′) of correlated signals in which the frequency lines corresponding to half-integer values of the frequency resolution defined by the FFT are obtained by a combination of both amplitude and phase values of the FFT spectrum (S).
-
Citations
21 Claims
-
1. A method of using a receiver for acquiring positioning signals of a geographic localization system, comprising the steps of:
-
obtaining a positioning signal of the geographic localization system containing localization information; combining the positioning signal with a local pseudorandom code sequence obtaining a correlation signal; obtaining a first spectrum of frequency of the correlation signal; obtaining a second spectrum comprising intermediate-frequency data by complex combinations of amplitude and phase values of adjacent bins of the first spectrum; and searching for peaks in the second spectrum for use in providing pseudo-ranges and fixes in space and time by said receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. Receiver for a geographic localization system comprising:
-
means for receiving a signal containing localization information; means for demodulating the signal; means for multiplying the signal with a local pseudorandom code sequence obtaining a correlation signal; means for obtaining a first spectrum of frequency of the correlation signal; means for obtaining a second spectrum comprising intermediate-frequency data by complex combinations of amplitude and phase values of adjacent bins of the first spectrum; and means for detecting peaks in the second spectrum.
-
-
11. Receiver for a geographic localization system comprising:
-
means for obtaining a signal containing localization information; means for multiplying the signal with a local pseudorandom code sequence obtaining a correlation signal; means for obtaining a first spectrum of frequency of the correlation signal; means for obtaining a second spectrum comprising intermediate-frequency data by complex combinations of amplitude and phase values of adjacent bins of the first spectrum; and means for searching peaks in the second spectrum, wherein said interpolating means are adapted for the evaluation of;
-
-
12. A machine-readable medium comprising instructions which, when executed by a machine, cause the machine to perform operations, the instructions comprising:
-
program code for obtaining a signal containing localization information; program code for combining the signal with a local pseudorandom code sequence obtaining a correlation signal; program code for obtaining a first spectrum of frequency of the correlation signal; program code for obtaining a second spectrum comprising intermediate-frequency data by complex combinations of amplitude and phase values of adjacent bins of the first spectrum; and program code for searching for peaks in the second spectrum. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
-
20. Receiver for a geographic localization system, comprising:
-
a receiving section adapted for obtaining a signal containing localization information; a correlator processor adapted for multiplying the signal with a local pseudorandom code sequence obtaining a correlation signal; a signal processor adapted for obtaining a first spectrum of frequency of the correlation signal; said signal processor also being adapted for obtaining a second spectrum comprising intermediate-frequency data by complex combinations of amplitude and phase values of adjacent bins of the first spectrum; and a peak detection system for searching peaks in the second spectrum.
-
-
21. A receiver for a geographic localization system comprising:
-
a receiving section for obtaining a signal containing localization information; and at least one processor executing software stored in a memory and being adapted for; multiplying the signal with a local pseudorandom code sequence obtaining a correlation signal, obtaining a first spectrum of frequency of the correlation signal, obtaining a second spectrum comprising intermediate-frequency data by complex combinations of amplitude and phase values by utilizing;
-
Specification