Non-equal power quadrature phase shift keying signal modulation method and device

A quadrature phase shift keying and non-equal power technology, applied in the field of satellite navigation, can solve the problems of inability to handle modulation and lack of flexibility
CN103297380AActive Publication Date: 2013-09-11NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2013-09-11

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Abstract

The invention provides a non-equal power quadrature phase shift keying signal modulation method and device. The modulation method includes four steps of S1, calculating an intermodulation parameter b according to power ratio of two quadrature phase shift keying service signals; S2, calculating an intermodulation parameter a; S3, generating constant envelope baseband signals according to center frequency relation of the two quadrature phase shift keying service signals; S4, modulating the constant envelope baseband signals to a carrier in a quadrature manner. The modulation device comprises a baseband signal generator and a quadrature modulator. The baseband signal generator combines two channels of non-equal power quadrature phase shift keying service signals into one channel of constant envelope baseband signals. The quadrature modulator modulates the constant envelope base signals in a quadrature manner and outputs the same. The two non-equal power quadrature phase shift keying service signals are modulated to one carrier according to the given power ratio and the center frequency relation, constant signal envelope and high multiplexing efficiency are realized, and signal transmitting quality and power efficiency are improved.
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Description

technical field

[0001] The present invention relates to the technical field of satellite navigation, in particular to a signal modulation method and a modulation device of a satellite navigation system, and more particularly to a modulation method of two QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying) signals with unequal power and modulators. Background technique

[0002] GNSS (Global Navigation Satellite System) generally consists of a satellite segment, a control segment and a ground segment. The GNSS satellites in the satellite segment transmit service signals; the GNSS receivers in the ground segment process service signals from different GNSS satellites, calculate the distance from each GNSS satellite and complete the position calculation, so as to obtain navigation and positioning services. The modulation method of the service signal transmitted by the GNSS satellite is the main factor affecting the quality of service available to the GNSS receive...

Claims

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