Method and device for dual-frequency constant envelope modulation of navigation signal

A technology of navigation signal and modulation method, which is applied in the field of satellite navigation and can solve problems such as unable to give solutions

Inactive Publication Date: 2016-05-04
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

But in a broader sense, how to realize the constant envelope modulation with any number of sideband signals and any power ratio, neither AltBOC nor ACE-BOC modulation can give a solution

Method used

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  • Method and device for dual-frequency constant envelope modulation of navigation signal
  • Method and device for dual-frequency constant envelope modulation of navigation signal
  • Method and device for dual-frequency constant envelope modulation of navigation signal

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Embodiment Construction

[0054] A modulation method or modulation device for a dual-unbalanced quadrature phase-shift keying signal of the present invention will be described in detail below with reference to the accompanying drawings, taking satellite navigation service signals using direct-sequence spread spectrum technology as an example.

[0055] It is known that the signal that needs to be multiplexed in the upper sideband is s k (t), where k=1,2,3...N; the signal that needs to be multiplexed in the lower sideband is where j=1,2,3...M.

[0056] figure 1 It is a schematic flow chart of a dual-frequency navigation signal constant envelope modulation method provided by the present invention, and the method includes the following steps:

[0057] Step S1: Carry out constant envelope modulation on the signal components that need to be multiplexed in the upper and lower sidebands. The method of constant envelope modulation can adopt any constant envelope transmission technology suitable for constant ...

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Abstract

The invention discloses a method and a device for dual-frequency constant envelope modulation of a navigation signal. Through the modulation method, service signals at any way and any power ratio on two sidebands are combined to one constant envelope signal to be transmitted. The modulation device comprises a single-frequency constant envelope modulator, a dual-frequency constant envelope modulator and a quadrature modulator. The single-frequency constant envelope modulator respectively modulates the service signals on the upper and lower sidebands to one constant envelope baseband signal and outputs real-part signals and imaginary-part signals of the constant envelope baseband signals of the upper and lower sidebands to the dual-frequency constant envelope modulator; the dual-frequency constant envelope modulator combines the constant envelope baseband signals of the upper and lower sidebands into one constant envelope baseband signal and outputs the real-part signal and the imaginary-part signal of the constant envelope baseband signal to the quadrature modulator, and the quadrature modulator outputs the input signal after quadrature modulation. According to the scheme, a dual-frequency signal can be transmitted through a set of transmission chains, a set of additional independent modulators and transmission chains are not needed, and any power ratio and any signal way can be achieved.

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. 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 ground segment. [0003] The GNSS satellite in the satellite segment is a strictly power-limited system. In order to improve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/36
CPCH04L27/361
Inventor 黄新明陈华明李垣陵朱祥维李井源张勇虎倪少杰吕志成伍微
Owner NAT UNIV OF DEFENSE TECH
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