Patent ID: 9529070
Filing Date: 2016-12-27
CPC Classification: G01S

Claim Text:
1. A radionavigation signal tracking device comprising a first tracking stage of a first radionavigation signal contained in an incoming signal to be applied to the device, the first radionavigation signal comprising a first carrier at a first frequency modulated by a first spreading waveform, said first tracking stage comprising a first carrier phase-locked loop with a mixer configured to multiply the incoming signal with a local replica of the first carrier, the first carrier phase-locked loop comprising a phase discriminator of the first carrier configured to produce a first error signal arising from a first phase difference between the first carrier and the local replica of the first carrier, the first carrier phase-locked loop being configured to adjust the phase of the local replica of the first carrier on the basis of the first error signal; a second tracking stage of a second radionavigation signal contained in the incoming signal, the second radionavigation signal comprising a second carrier at a second frequency, different from the first frequency, modulated by a second spreading waveform, the second tracking stage comprising a second carrier phase-locked loop with a mixer configured to multiply the incoming signal with a local replica of the second carrier, wherein the second carrier phase-locked loop comprises a phase discriminator of a beat phase between the first carrier and the second carrier configured to produce a second error signal arising from a difference between the first phase difference and a second phase difference between the second carrier and the local replica of the second carrier; and wherein the second phase-locked loop is configured to adjust the phase of the local replica of the second carrier on the basis of the first and second error signals.