Baseband signal processing method and system for Galilei system

A processing method and technology for baseband signals, which are applied in radio wave measurement systems, beacon systems using radio waves, instruments, etc., can solve the problems of complex structure of processing devices and low baseband signal processing accuracy, and achieve improved capture sensitivity and tracking. The effect of narrow jitter range and reduced circuit complexity

Active Publication Date: 2011-10-26
北京中科微知识产权服务有限公司
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Problems solved by technology

[0010] The problems existing in the prior art are that the precision of the baseband signal processing is low, and the structure of the processing device is complicated

Method used

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  • Baseband signal processing method and system for Galilei system
  • Baseband signal processing method and system for Galilei system
  • Baseband signal processing method and system for Galilei system

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Embodiment Construction

[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below through preferred embodiments with reference to the accompanying drawings. It should be noted that the scope of the invention includes but is not limited to the described preferred embodiments.

[0049] figure 1 is a schematic diagram of Galileo system L1 band signal processing, such as figure 1 As shown in , the baseband signal processing of L1 band satellite navigation receiver of Galileo system can include two processes of signal acquisition and signal tracking.

[0050] The signal capture process can be as follows figure 2 shown in , where:

[0051] 1) The received satellite signal (for example, digital intermediate frequency signal) is subjected to down-conversion processing by the down-conversion module 110, the intermediate frequency of the down-conversion signal can adopt the upper sideband intermediate freq...

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Abstract

The invention provides a method and a system which are used for processing the baseband signals of a satellite navigation receiver in a Galileo system and particularly used for processing the baseband signals of an L1 wave band in the Galileo system. The method comprises the following steps: acquiring satellite signals, carrying out down conversion to the satellite signals, and obtaining sample signals; calculating according to the sample signals and local code signals generated in the local; acquiring new satellite signals when the calculation of all the code signals is finished and accumulative times reach a setting value and calculating results do not exceed a threshold value; and otherwise, tracking the satellite signals. The invention reduces the complexity of a circuit and improves the acquisition sensibility by utilizing the modulation characteristics of the baseband signals of the L1 wave band in the Galileo system. Furthermore, a code tracking loop circuit adopts a two-phase discriminator structure; and the error of phase discrimination is reduced remarkably.

Description

technical field [0001] The invention relates to a method and system for baseband signal processing of a satellite signal receiver in Galileo L1 band. Background technique [0002] The Galileo system is a satellite navigation system initiated by the European Union and jointly developed and maintained by many countries. It is compatible with the Global Positioning System (GPS) of the United States and provides more extensive and excellent services than GPS. The Galileo system mainly provides Open Services (OS), Safety of Life Services (SOL), Commercial Services (CS) and Public Regulatory Services (PRS). Galileo satellites use three carriers to send signals: 1575.42MHz L1 carrier using binary code offset (BOC) (1, 1) modulation, 1278.75MHz L6 carrier using binary phase shift keying (BPSK) modulation, and a 1191.795 MHz L5 carrier with Alternate Binary Code Offset (AltBOC) (15, 10) modulation. [0003] Standard Linear Offset Carrier (LOC) by sine wave sin(ω 0 t) to modulate t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/04G01S5/14
Inventor 杨乐陈杰王云
Owner 北京中科微知识产权服务有限公司
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