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Mirror point high dynamic suppressing correlator adaptive to spaceborne GNSS-R receiver

A high dynamic and correlator technology, applied in the direction of instruments, satellite radio beacon positioning systems, measuring devices, etc., can solve the problems of weakening signal-to-noise ratio, large time delay error, reducing high-precision ocean surveying, etc., to improve signal Noise ratio, the effect of reducing speckle noise

Inactive Publication Date: 2015-07-29
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The speckle noise existing in the blazed area to which the specular reflection point belongs will affect the signal processing of the traditional spaceborne GNSS-R receiver, which will cause a large time delay error, and the speckle noise weakens the signal-to-noise ratio of the signal, thereby reducing the oceanographic high precision

Method used

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  • Mirror point high dynamic suppressing correlator adaptive to spaceborne GNSS-R receiver
  • Mirror point high dynamic suppressing correlator adaptive to spaceborne GNSS-R receiver
  • Mirror point high dynamic suppressing correlator adaptive to spaceborne GNSS-R receiver

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Embodiment 1

[0097] In order to better illustrate the advantages of the correlator designed in the present invention compared to the traditional correlator, the simulation environment is first described as follows:

[0098] parameters

value

unit

track height

756

Km

Elevation angle of mirror launch point

28

Deg

wind speed

6.5

m / s

Significant wave height

1.5

m

Up-look antenna and down-look antenna gain

25

dBi

receiver bandwidth

50

MHz

Look-Up Antenna Noise Temperature

40

K

Looking Down Antenna Noise Temperature

120

K

Receiver Noise Temperature

280

K

Receiver Noise Value

3

dB

Satellite signal transmission power

26

dBW

On-orbit spatial resolution

100

Km

[0099] The satellite elevation angle at the specular reflection point is between 29 and 32 degrees. The sea surface reflection signal receivi...

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Abstract

The invention discloses a mirror point high dynamic suppressing correlator adaptive to a spaceborne GNSS-R receiver. The correlator comprises a direct signal tracking module (1), a delay module (2), a mirror point high dynamic suppressing control module (3), a mirror point high dynamic suppressing processing module (4), a mirror point high dynamic suppressing infusing module (5), a carrier compensation module (6) and an interference processing module (7). The certain delay processing is performed on direct signals after carrier tracking firstly, the mirror reflection high dynamic suppressing is performed, interference processing is performed on reflection signals after carrier compensation, and the two-dimensional delay Doppler correlation power is acquired finally. The correlator is used for producing local copying carriers, local copying code generation is omitted, interference processing is performed on the direct signals and reflection signals after delay Doppler compensation processing, the Doppler frequency shift of one mirror reflection point in different sampling times can be acquired, the speckle noise of a mirror reflection region is suppressed, and the signal-noise ratio of the signals is increased.

Description

technical field [0001] The present invention relates to a GNSS-R receiver, more particularly, to a correlator suitable for space-borne GNSS-R receivers and capable of suppressing high dynamics of mirror points. By processing the high-speed moving specular reflection points, the spaceborne GNSS-R receiver can improve the accuracy of sea surface measurement in sea surface inversion. Background technique [0002] Global Navigation Satellite System (GNSS) is a satellite-based radio navigation system that uses artificial earth satellites as navigation platforms, providing all-weather, high-precision positions for various military and civilian carriers on land, sea, air, and space around the world. , speed and time information, so it is also called space-based positioning, navigation and timing (PNT) system. Global Navigation Satellite System (GNSS) is a unified name for individual satellite navigation and positioning systems such as Global Positioning System (GPS), GLONASS, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 修春娣于成辉李伟强高洪兴杨东凯
Owner BEIHANG UNIV
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