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Method and device for modulating dual-quadrature phase shift keying signal

A technology of phase shift keying and modulation method, which is applied in the field of satellite navigation, and can solve problems such as inability to accurately realize amplitude and phase modulation of service signals, generation of complex random numbers, lack of analytical solutions, etc.

Active Publication Date: 2013-10-16
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

MajorVote technology enables the multiplexing efficiency of four equal-power service signals to reach 80%, but the multiplexing process requires complex random number generation
The optimal phase constant envelope transmission technology has high multiplexing efficiency, but the optimal phase value used in the modulation process is an approximate solution obtained by numerical algorithm search, and the amplitude and phase modulation of each service signal cannot be accurately realized due to the lack of analytical solutions Shortcomings

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  • Method and device for modulating dual-quadrature phase shift keying signal
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  • Method and device for modulating dual-quadrature phase shift keying signal

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Embodiment Construction

[0033]The following will take the satellite navigation service signal of the direct sequence spread spectrum system as an embodiment, and the modulation method and modulation device of the bi-quadrature phase shift keying signal of the present invention will be described in detail with reference to the accompanying drawings, so as to realize the constant envelope complex of the four service signals. use.

[0034] figure 1 It is a schematic flow chart of the principle of the modulation method of the bi-quadrature phase shift keying signal provided by the technical solution of the present invention, as shown in the figure, including the following steps:

[0035] Step S1, generating four binary service signals. In the design of the satellite navigation service signal of the direct sequence spread spectrum system, four services with amplitudes of +1 or -1 are generated according to the specific spreading code, secondary spreading code, subcarrier and design parameters of the navi...

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Abstract

The invention provides a method for modulating a dual-quadrature phase shift keying signal. The method comprises the following steps of: generating four paths of irrelevant equipower binary service signals S1(t), S2(t), S3(t) and S4(t); combining the four paths of irrelevant equipower binary service signals into a path of base band complex signal S(t) by using the following shown in the specification; and performing quadrature modulation on a real signal and a virtual signal of the base band complex signal S(t) so as to form the dual-quadrature phase shift keying signal. In the method, the four service signals are modulated on the same carrier, so that the constant signal envelopment and the high multiplexing efficiency are realized, and the emission quality and the power efficiency of sequential signals 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 modulation device of a satellite navigation system, and more particularly to a modulation method and modulation device of a dual quadrature phase shift keying signal. Background technique [0002] A Global Navigation Satellite System (GNSS) 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 the service signals from different GNSS satellites, calculate the distance to each GNSS satellite and complete the position calculation 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 ground segment GNSS receiver. [0003] In view of the limitation ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/20H04L5/02
Inventor 张锴王飞雪欧钢孙广富
Owner NAT UNIV OF DEFENSE TECH
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