Radionavigation signal tracking device
First Claim
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.
1 Assignment
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Accused Products
Abstract
A radionavigation signal tracking device comprises a first and a second tracking stage for radionavigation signals. The first tracking stage comprises a first carrier phase-locked loop. The latter produces a first error signal arising from a phase difference between the first carrier and its replica. The phase of the replica of the first carrier is adjusted with the first error signal. The second tracking stage comprises a second carrier phase-locked loop. The latter produces a second error signal arising from a difference between the first phase difference and a phase difference between the second carrier and the replica thereof. The phase of the replica of the second carrier is adjusted with the first and second error signals.
10 Citations
19 Claims
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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;
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. 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;
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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 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; 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; further comprising a third tracking stage of a third radionavigation signal contained in the incoming signal, the third radionavigation signal comprising a third carrier at a third frequency, different from the first and second frequencies, modulated by a third spreading waveform, the third tracking stage comprising a third carrier phase-locked loop with a mixer configured to multiply the incoming signal with a local replica of the third carrier, the third carrier phase-locked loop comprising a phase discriminator of a beat between the first carrier and the third carrier configured to produce a third error signal arising from a difference between the first phase difference and a third phase difference between the third carrier and the local replica of the third carrier; and the third phase-locked loop being configured to adjust the phase of the local replica of the third carrier on the basis of the first and third error signals.
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Specification