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Constant envelope multiplexing method and of double-frequency four-component spread spectrum signals and receiving method of constant envelope multiplexed signal

A spread-spectrum signal and four-component technology, applied in the fields of navigation and satellite positioning, can solve the problems of reducing the flexibility of AltBOC

Active Publication Date: 2013-04-03
TSINGHUA UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

This limitation reduces the flexibility of AltBOC usage

Method used

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  • Constant envelope multiplexing method and of double-frequency four-component spread spectrum signals and receiving method of constant envelope multiplexed signal
  • Constant envelope multiplexing method and of double-frequency four-component spread spectrum signals and receiving method of constant envelope multiplexed signal
  • Constant envelope multiplexing method and of double-frequency four-component spread spectrum signals and receiving method of constant envelope multiplexed signal

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Embodiment Construction

[0053] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0054] In the satellite navigation system, the receiver needs to use the frequently reversed phase of the spreading code for ranging, and also needs to demodulate the message information modulated in the signal to obtain ephemeris information and other information broadcast by the system. Therefore, each signal component transmitted contains a binary data stream and a spreading code. For some service signals in practical applications, there may be no modulation message on it. This situation is equivalent to the data stream on the signal component of this channel is a constant value of 0 or 1. In the following, we will refer to this no modulation message information The channel is called the pilot channel.

[0055] The invention can realize constant envelope multiplexing of four signal components at two frequency points. Note that these two frequency points ...

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Abstract

The invention discloses a constant envelope multiplexing method of double-frequency four-component spread spectrum signals. The method comprises the following steps of: generating four signal components as corresponding baseband spread spectrum signals, and obtaining corresponding additional phase according to the value combination state of the baseband spread spectrum signals within the current period of time; generating a pair of components, of which the phases are orthogonal to each other, by the additional phase through a trigonometric function generator; generating two paths of carriers, which are orthogonal to each other, by a carrier generator, respectively multiplying the carriers by the generated components, and executing subtraction on the products to get a radio frequency signal meeting the constant envelope condition. The invention also provides a generation device of the constant envelope multiplexed signal, and a receiving method of the constant envelope multiplexed signal. According to the constant envelope multiplexing method, four signal components of two frequency points are synthesized into one constant envelope signal, so that low-range and medium-range receivers can process the signal with narrower receiving bandwidth and lower baseband so as to obtain the basic ranging performance, high-range receivers can get better ranging accuracy by wider receiving bandwidth and higher processing complexity, and the ranging performance of the receivers during receiving each signal component respectively is improved.

Description

technical field [0001] The invention is applied in the field of satellite positioning and navigation completed by radio, and is especially suitable for the global navigation satellite system (GNSS) using DSSS signals as ranging signals, and specifically relates to the constant envelope multiplexing method of dual-frequency four-component spread spectrum signals, device and receiving method. Background technique [0002] With the continuous construction of the Global Navigation Satellite System (GNSS), the demand for navigation services continues to expand. The number of signals broadcast by various satellite navigation systems on the same frequency band is increasing, which makes the original limited satellite navigation spectrum more and more crowded. As the number of signals broadcast by the same system in the same frequency band increases, the complexity of satellite payloads continues to increase. [0003] For some specific system construction requirements and applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J13/12H04L27/26H04L25/02H04L5/00G01S19/37
CPCG01S19/02H04B1/707G01S19/30G01S19/37H04J13/0003H04J13/18
Inventor 姚铮陆明泉
Owner TSINGHUA UNIV
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