Constant envelop multiplexing method, generating device and receiving method for navigation signal

A navigation signal and constant envelope technology, applied in the field of satellite positioning and navigation, can solve the problems of reducing the flexibility of AltBOC and TD-AltBOC

Active Publication Date: 2012-09-26
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

This technical limitation reduces the flexibility of the use of AltBOC and TD-AltBOC

Method used

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  • Constant envelop multiplexing method, generating device and receiving method for navigation signal
  • Constant envelop multiplexing method, generating device and receiving method for navigation signal
  • Constant envelop multiplexing method, generating device and receiving method for navigation signal

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Embodiment Construction

[0069] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0070] 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 code stream and a spreading code. For some service signals, there may be a pilot channel without message modulation. In this case, the data code stream on the signal component of this channel can be regarded as a constant value of 0 or 1.

[0071] The constant envelope multiplexing method of the navigation signal of the present invention can realize the constant envelope multiplexing of four signal components on two frequency points at most, and note that these two frequency points are respec...

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Abstract

The invention relates to a constant envelop multiplexing method, generating device and receiving method for a navigation signal. A base-band spread spectrum signal generator is used for generating a base-band spread spectrum signal of each signal component, each base-band spread spectrum signal is subjected to multichannel wave form multiplexing at a multichannel multiplexing waveform generator to generate a multichannel multiplexed in-phase base-band waveform and a multichannel multiplexed orthogonal base-band waveform, then a carrier generator is used for generating two carriers phases of which are orthogonal to each other, the two carriers are respectively multiplied by and added to the multichannel multiplexed in-phase base-band waveform and the multichannel multiplexed orthogonal base-band waveform, thus obtaining a radio frequency signal which meets constant envelop conditions; in a receiving process, filtering, amplification, frequency conversion and digital-to-analog conversion is carried out on the radio frequency signal of the signal component, and finally corresponding digital signal processing is carried out on a digital intermediate frequency signal to realize demodulation. According to the invention, multiple signal components at two frequency points are combined into one constant envelope signal, more signal power can be distributed to a pilot channel signal component, and ranging performance is greatly improved.

Description

technical field [0001] The invention belongs to the field of satellite positioning and navigation, and is especially suitable for a global navigation satellite system using DSSS signals as ranging signals, and relates to a constant-envelope multiplexing method, a generating device and a receiving method of navigation signals. 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] If different service signals in a frequency band use independent transmitting antennas and amplifier links, the requirements for a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707G01S19/31
CPCH04L5/00H04L25/02H04L27/26G01S19/31H04L5/06H04L5/12H04L27/362H04L27/366G01S19/02H04B1/7087G01S19/24G01S19/35H04B1/707G01S19/13H04B1/709H04L27/2627
Inventor 姚铮陆明泉
Owner TSINGHUA UNIV
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