Patent ID: 8144752

Claim:
Process for receiving a composite radioelectric navigation signal comprising at least one signal, called the BOC signal, modulated by a carrier of frequency f p , a square subcarrier of frequency f sp and a pseudo-random code of frequency f c , lower than frequency f sp , in which, the radioelectric navigation signal is transposed to an intermediate frequency and digitised, the digitised signal is correlated in phase and in quadrature by two local carriers in phase and in quadrature generated by a numerically controlled local carrier oscillator so as to provide a baseband signal comprising a channel, called channel I, and a channel, called channel Q, in quadrature in relation to said channel I, wherein: successive pseudo-random codes, called modified codes, K in number, where K=α·f sp /f c , α being a predetermined integer, are generated locally by a digital generator of modified codes, each modified code exhibiting over a time-span T k , where T k =1/α·f sp , the form of the pseudo-random code without subcarrier, two successive modified codes being temporally offset by a duration T k , on each channel the baseband signal is multiplied by the K modified pseudo-random codes, on each channel the K resulting signals are integrated over a predetermined period of time, on each channel the K results of integrations are temporally interlaced, on each channel the signal thus generated is correlated in phase and in quadrature by two locally generated subcarriers in phase and in quadrature, in order to provide signals, called channel-output signals, on each channel the channel-output signal is integrated over a predetermined period of time.