Modulation method and device for dual unbalanced quadrature phase shift keying signal

A quadrature phase shift keying and unbalanced technology, applied in the field of satellite navigation, can solve problems such as unrealizable
CN105635013BActive Publication Date: 2019-02-22NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2019-02-22

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Abstract

The invention relates to a method and an apparatus for modulating double UQPSK (Unbalance Quaternary Phase Shift Keying) signals. The modulation method comprises the steps of: firstly, calculating signal component coefficients c1, c2, c3 and c4 according to a branch power ratio of UQPSK service signals; next, calculating intermodulation coefficients b1, b2, b3 and b4 according to the branch power ratio of the UQPSK service signals; then generating a constant-envelope baseband signal; and finally, carrying out quadrature modulation on the constant-envelope baseband signal to a carrier. The modulation apparatus comprises a baseband signal generator and a quadrature modulator; the baseband signal generator synthesizes two paths of UQPSK service signals into one path of constant-envelope baseband signal, and outputs a real part signal and an imaginary part signal of the constant-envelope baseband signal to the quadrature modulator; and the quadrature modulator outputs signals after carrying out quadrature modulation on the input signals. According to the method and the apparatus which are disclosed by the invention, two UQPSK service signals are modulated to the same carrier, constant signal envelope and high multiplexing efficiency are achieved, and signal transmission quality and power efficiency are improved.
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Description

technical field

[0001] The 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 double unbalanced quadrature phase shift keying signal. Background technique

[0002] GNSS (Global Navigation Satellite System, 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 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 receive...

Claims

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