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A short-time synchronization method of gnss reflected signal suitable for spaceborne environment

A reflection signal, satellite-borne technology, applied in the field of satellite navigation and application, can solve the problem of synchronous single-wave synchronous forming of correlation window and so on

Active Publication Date: 2017-03-01
山东航向电子科技有限公司
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  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to: provide a kind of GNSS reflection signal short-time synchronization method applicable to space-borne environment, it can effectively solve the correlation window synchronization problem and single-wave synchronous shaping problem that prominently exist in space-borne GNSS-R technology

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  • A short-time synchronization method of gnss reflected signal suitable for spaceborne environment
  • A short-time synchronization method of gnss reflected signal suitable for spaceborne environment
  • A short-time synchronization method of gnss reflected signal suitable for spaceborne environment

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Embodiment

[0154] The present invention proposes a short-term GNSS reflected signal synchronization method suitable for space-borne environments, and its overall module layered diagram is shown in Figure 4 . It is divided into a satellite-borne GNSS-R receiver information acquisition module, a mirror reflection point calculation module, a correlation window synchronization module and a single-wave synchronization shaping module. The spaceborne GNSS-R receiver information acquisition module can obtain the position and velocity information of the LEO platform and GNSS satellites, so that the position and velocity of the mirror reflection point can be calculated. According to the positional relationship and velocity information of the LEO platform, GNSS satellites, and mirror reflection points, the Doppler difference of the reflected signal relative to the direct signal can be calculated. According to the relationship between the Doppler difference and the delay difference, the short-term ...

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Abstract

The invention discloses a short-time synchronization method of GNSS (global navigation satellite system) reflection signals for satellite-borne environment. The short-time synchronization method comprises the following steps: step 1, obtaining GNSS ephemeris information, and the location and speed information of a receiver from a navigation module of a satellite-borne GNSS-R receiver; step 2, calculating the location and the speed of a GNSS satellite from GNSS ephemeris data; step 3, setting the start point and the width of a relative window according to demands of inversion application; step 4, obtaining the correcting value of the relative power waveform of a single GNSS reflection signal according to the Doppler difference of reflection signals relative to direct signals, and finally obtaining the formed result of single-wave synchronization through noncoherent accumulation. The short-time synchronization method disclosed by the invention can be directly applied to inversion, synchronization processing does not need to be performed again, so that the calculating procedures are reduced to the maximum extent, and the correction precision of single-wave synchronization is improved; the short-time synchronization method has the advantages of low power consumption and high precision.

Description

technical field [0001] The invention relates to a short-time synchronization method for GNSS reflection signals suitable for spaceborne environments, which essentially processes the GNSS reflection signals and belongs to the field of satellite navigation and applications. Background technique [0002] The Global Navigation Satellite System (GNSS) is designed to solve the problems of positioning, speed measurement and timing. Since the 1990s, with the discovery of the role of navigation satellite reflection signals on the characteristics of reflectors, the application of navigation satellite reflection signals has developed rapidly. The application scope of the satellite navigation system has long gone beyond the traditional field. The research of sea surface altimetry, wind measurement, soil moisture measurement and ice measurement using reflected signals has achieved many important results. [0003] GNSS reflected signal technology (GNSS-R) is divided by receiver platform,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/27G01S19/25
CPCG01S19/254G01S19/27
Inventor 杨东凯杨威修春娣李伟强
Owner 山东航向电子科技有限公司