Modulation signals for a satellite navigation system

摘要

Techniques for controlling a power spectrum of a navigation transmission signal in a navigation system are disclosed. In one particular embodiment, the techniques may be realized as a method of controlling a power spectrum of a navigation transmission signal in a navigation system, the navigation transmission signal comprising a carrier signal, a ranging code, a data signal, and at least one stepped subcarrier modulation signal. The method may comprise modulating the canier signal by the at least one stepped subcarrier modulation signal, the data signal, and the ranging code to generate the navigation transmission ranging signal, wherein the at least one stepped subcarrier modulation signal may comprise a number, m, of amplitude levels, where m>2. The amplitude levels may be arranged to constrain the power spectrum of the navigation transmission signal in a predetermined manner.

主权项

1. A method of controlling a power spectrum of a navigation transmission signal in a navigation system, the navigation transmission signal comprising a carrier signal, a ranging code, a data signal, and at least one stepped subcarrier modulation signal, the method comprising the step of modulating the carrier signal by the at least one stepped subcarrier modulation signal, the data signal, and the ranging code to generate the navigation transmission ranging signal; wherein the at least one stepped subcarrier modulation signal comprises a number, m, of amplitude levels, where m>2, the amplitude levels being arranged to constrain the power spectrum of the navigation transmission signal in a predetermined manner.