Method and device for compressing a wide band radio-navigation signal, associated method and device for calculating the correlation function of the spreading code of the compressed signal
First Claim
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1. A method for compressing a wide band satellite radio-navigation signal in order to transmit it on a narrow band channel, said method comprising:
- receiving a satellite radio-navigation signal,performing a spectral conversion of said satellite radio-navigation signal into a plurality N of frequency channels of reduced bandwidth,time-shifting each of the channelled signals by a predetermined distinct delay, the delay being configured so as to be greater than a duration of a correlation support of a spreading code of a channelled signal, andaccumulating the shifted channelled signals in order to produce a compressed signal.
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Abstract
A method for compressing a wide band satellite radio-navigation signal is disclosed. The wide band signal is compressed in order to transmit it on a narrow band channel. A correlation function is calculated for the spreading code of the compressed satellite radio-navigation signal.
9 Citations
14 Claims
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1. A method for compressing a wide band satellite radio-navigation signal in order to transmit it on a narrow band channel, said method comprising:
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receiving a satellite radio-navigation signal, performing a spectral conversion of said satellite radio-navigation signal into a plurality N of frequency channels of reduced bandwidth, time-shifting each of the channelled signals by a predetermined distinct delay, the delay being configured so as to be greater than a duration of a correlation support of a spreading code of a channelled signal, and accumulating the shifted channelled signals in order to produce a compressed signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for calculating a correlation function of the spreading code of a satellite radio-navigation signal compressed according to a method for compressing a wide band satellite radio-navigation signal in order to transmit it on a narrow band channel, comprising:
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receiving a satellite radio-navigation signal, performing a spectral conversion of said satellite radio-navigation signal into a plurality N of frequency channels of reduced bandwidth, time-shifting each of the channelled signals by a predetermined distinct delay, the delay being configured so as to be greater than a duration of a correlation support of a spreading code of a channelled signal, and accumulating the shifted channelled signals in order to produce a compressed signal, said method for calculating a correlation function comprising; receiving a compressed signal transmitted on a narrow band, performing spectral conversion of a locally generated spreading code into a plurality N of frequency channels, time shifting said received compressed signal by a plurality of predetermined distinct delays in order to obtain a plurality of delayed signals, said delays being configured so as to be greater than the duration of the correlation support of the channelled spreading code, the number of delayed signals being equal to the number N of frequency channels, calculating a complex conjugate pair product between a delayed signal and a channel of the spectrum of said locally generated spreading code in order to obtain an intermediate signal, and calculating an inverse Fourier transform of said intermediate signal in order to obtain the correlation function of the spreading code of said satellite radio-navigation signal. - View Dependent Claims (9, 10)
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11. A device for compressing a wide band satellite radio-navigation signal in order to transmit it on a narrow band channel, comprising:
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a convertor for spectrally converting said wide band satellite radio-navigation signal into a plurality N of frequency channels of reduced bandwidth, a time shifter for time shifting each of the channelled signals by a predetermined distinct delay, the delay being configured so as to be greater than a duration of a correlation support of a channelled signal, and an accumulator for accumulating said shifted channelled signals in order to produce a compressed signal. - View Dependent Claims (12)
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13. A device for calculating a correlation function of the spreading code of a satellite radio-navigation signal compressed by spectral conversion of the received satellite radio-navigation signal into a plurality N of frequency channels of reduced bandwidth, time-shifting each of the channelled signals by a predetermined distinct delay, the delay being greater than a duration of a correlation support of a spreading code of a channelled signal, and accumulating the shifted channelled signals in order to generate the compressed signal, said device comprising:
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a convertor for spectral conversion of a locally generated spreading code into a plurality N of frequency channels, a time shifter for time shifting the satellite radio-navigation signal by a plurality of predetermined distinct delays in order to obtain a plurality of delayed signals, said delays being configured so as to be greater than a duration of a correlation support of the channelled spreading code, a calculator for calculating a complex conjugate pair product between a delayed signal and a channel of the spectrum of said locally generated spreading code in order to obtain an intermediate signal, and a calculator for calculating an inverse Fourier transform of said intermediate signal in order to obtain the correlation function of the spreading code of said satellite radio-navigation signal. - View Dependent Claims (14)
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Specification