Abstract: A method of processing offset carrier modulated, OCM, ranging signals in a radionavigation system including a plurality of satellite-borne transmitters and at least one ground-based receiver includes receiving a first radionavigation signal from at least one of the plurality of satellite-borne transmitters and down-converting and digitizing the first radionavigation signal to derive therefrom a first OCM signal SA, receiving a second signal SB synchronously broadcast with the first OCM signal SA, the second signal SB having the same or substantially the same center frequency as the first OCM signal SA, coherently combining the first OCM signal SA with the second signal SB at the receiver to generate a combined signal SC, generating a combined correlation value YC corresponding to a correlation of the combined signal SC with a local replica of the first OCM signal SC, and deriving ranging information based on the combined correlation value YC.

Abstract: The invention provides an atmospheric monitoring and measurement system based on the processing of global navigation satellite system radio-frequency signals. The invention is characterized by an open-loop demodulation architecture to extract amplitude and phase information from the received satellite signals, and a signal processing technique which can provide statistics relating to the amplitude and phase variations induced by the atmosphere.

Abstract: A method of processing offset carrier modulated, OCM, ranging signals in a radionavigation system including a plurality of satellite-borne transmitters and at least one ground-based receiver includes receiving a first radionavigation signal from at least one of the plurality of satellite-borne transmitters and down-converting and digitizing the first radionavigation signal to derive therefrom a first OCM signal SA, receiving a second signal SB synchronously broadcast with the first OCM signal SA, the second signal SB having the same or substantially the same center frequency as the first OCM signal SA, coherently combining the first OCM signal SA with the second signal SB at the receiver to generate a combined signal SC, generating a combined correlation value YC corresponding to a correlation of the combined signal SC with a local replica of the first OCM signal SC, and deriving ranging information based on the combined correlation value YC.

Abstract: The invention provides an atmospheric monitoring and measurement system based on the processing of global navigation satellite system radio-frequency signals. The invention is characterized by an open-loop demodulation architecture to extract amplitude and phase information from the received satellite signals, and a signal processing technique which can provide statistics relating to the amplitude and phase variations induced by the atmosphere.

Abstract: A method of radar-imaging a scene in the far-field of a one-dimensional radar array, comprises providing an array of backscatter data D(fm, x?n) of the scene, these backscatter data being associated to a plurality of positions x?n, n=0 . . . N?1, N>1, that are regularly spaced along an axis of the radar array. The backscatter data for each radar array position x?n are sampled in frequency domain, at different frequencies fm, m=0 . . . M?1, M>1, defined by fm=fc?B/2+m??f, where fc represents the center frequency, B the bandwidth and ?f the frequency step of the sampling. A radar reflectivity image 1 (?m?, ?n?) is computed in a pseudo-polar coordinate system based upon the formula (2) with formula (3) where j represents the imaginary unit, formula (A) is the baseband frequency, FFT2D denotes the 2D Fast Fourier Transform operator, ?m?, m?=0 . . . M?1, and ?n?, n?=0 . . .

Abstract: A method of radar-imaging a scene in the far-field of a one-dimensional radar array, comprises providing an array of backscatter data D(fm, x?n) of the scene, these backscatter data being associated to a plurality of positions x?n, n=0 . . . N?1, N>1, that are regularly spaced along an axis of the radar array. The backscatter data for each radar array position x?n are sampled in frequency domain, at different frequencies fm, m=0 . . . M?1, M>1, defined by fm=fc?B/2+m??f, where fc represents the center frequency, B the bandwidth and ?f the frequency step of the sampling. A radar reflectivity image 1(?m?, ?n?) is computed in a pseudo-polar coordinate system based upon the formula (2) with formula (3) where j represents the imaginary unit, formula (A) is the baseband frequency, FFT2D denotes the 2D Fast Fourier Transform operator, ?m?, m?=0 . . . M?1, and ?n?, n?=0 . . .