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Method and apparatus for modulating double UQPSK (Unbalance Quaternary Phase Shift Keying) signals

A quadrature phase shift keying, unbalanced technology, applied in the field of satellite navigation, can solve problems such as inability to achieve

Active Publication Date: 2016-06-01
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of these two modulations is that they can only handle the constant envelope multiplexing of two QPSK service signals, and cannot realize the constant envelope multiplexing of two UQPSK (Unbalanced Quadrature Phase Shift Keying, unbalanced quadrature phase shift keying) service signals.

Method used

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  • Method and apparatus for modulating double UQPSK (Unbalance Quaternary Phase Shift Keying) signals
  • Method and apparatus for modulating double UQPSK (Unbalance Quaternary Phase Shift Keying) signals

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Embodiment Construction

[0075] In the following, the present invention will be described in detail with reference to the accompanying drawings by taking satellite navigation service signals using direct sequence spread spectrum technology as an embodiment.

[0076] Four channels of binary spread spectrum signals are known, and the binary spread spectrum signals may include information such as spread spectrum code, binary offset carrier, navigation message, and secondary spread spectrum code. Let S 1 (t) is the amplitude of the first signal at time t, S 2 (t) is the amplitude of the second signal at time t, S 3 (t) is the amplitude of the third signal at time t, S 4 (t) is the amplitude of the fourth signal at time t, the amplitudes of the four signals are all +1 or -1, and the four signals are not correlated with each other. The first signal and the second signal constitute a pair of UQPSK service signals, the third signal and the fourth signal constitute a pair of UQPSK service signals, and the p...

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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.

Description

technical field [0001] The 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 and a modulation device of a double-unbalanced quadrature phase-shift keying signal. Background technique [0002] GNSS (GlobalNavigationSatelliteSystem, global satellite navigation 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 receiver on the ...

Claims

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Application Information

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IPC IPC(8): H04L27/20H04L27/36
CPCH04L27/2089H04L27/362
Inventor 朱祥维黄新明龚航陈华明李井源李垣陵苏映雪都倩倩黄龙
Owner NAT UNIV OF DEFENSE TECH
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