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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

Active Publication Date: 2013-09-11
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The disadvantage of these two modulations is that they can only handle two QPSK service signals with equal power, without any flexibility; DualQPSK modulation requires that the center frequencies of the two QPSK service signals must be the same, and cannot handle two QPSK service signals with different center frequencies. Problems with signal modulation to one of the serving signal carriers

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

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Embodiment Construction

[0130] The satellite navigation service signal using direct sequence spread spectrum technology will be used as an example below, and a modulation method and modulation device for a non-equal power quadrature phase shift keying service signal of the present invention will be described in detail with reference to the accompanying drawings, and two non-equal power quadrature phase shift keying service signals will be realized. Constant-envelope modulation of equal-power quadrature phase-shift keying service signals. Two QPSK service signals are known, and each QPSK service signal is composed of two binary spread spectrum signals. The binary spread spectrum signal can include information such as spread spectrum code, binary offset carrier, navigation message, and secondary spread spectrum code.

[0131] figure 1 It is a schematic flowchart of the principle of a method for modulating a non-equal-power quadrature phase-shift keying service signal provided by technical solution 1 o...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/32H04L27/36
Inventor 张锴刘瀛翔肖志斌唐小妹王飞雪庄钊文
Owner NAT UNIV OF DEFENSE TECH
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