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On-board GNSS marine reflection signal generation method

A technology of ocean reflection signals and reflection signals, which is applied in the GNSS-R field, can solve the problems of high manpower and material resources, poor repeatability, and strict requirements for test scenarios, and achieve the effect of simplifying complex phenomena and being easy to implement in engineering

Inactive Publication Date: 2015-12-23
BEIHANG UNIV
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Problems solved by technology

Since GNSS-R experiments usually require strict requirements for test scenarios, it takes a lot of manpower and material resources to carry out
Moreover, due to the influence of climate and the difference in sea conditions and sea levels, the repeatability of the test is very poor.

Method used

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  • On-board GNSS marine reflection signal generation method
  • On-board GNSS marine reflection signal generation method
  • On-board GNSS marine reflection signal generation method

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Embodiment Construction

[0017] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0018] The present invention is a kind of generation method of airborne GNSS ocean reflection signal, and the process is as follows figure 1 shown, including the following steps:

[0019] Step 1. Obtain the correlation power curve of the GNSS ocean reflection signal through the ZV model (the sea surface wind field model established by Zavorotny and Voronovich), normalize the direct signal, and obtain the normalized correlation curve of the reflection signal;

[0020] Specifically:

[0021] (1) Set the basic parameters of the receiver and satellite.

[0022] Before setting parameters, select the local scattering coordinate system, that is, set the specular reflection point as the origin of the coordinate system, and the navigation satellite, receiver and specular reflection point are in a plane. The parameters about the receiver are: receiver altitu...

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Abstract

The invention discloses an on-board GNSS marine reflection signal generation method. Marine reflection signals received by a GNSS receiver are in the form of the superposition of different time-delay reflection signals. Therefore, a time delay correlation curve of the marine reflection signals is formed through the superposition of the correlation curves of different time-delay reflection signals. Based on the above principle, it can be assumed that the amplitude values of n equal-delay-interval reflection signals are figured out based on the approximately fitting method, so that the powers of the reflection signals relative to direct signals can be further figured out. After that, the time delays of the n reflection signals relative to direct signals are figured out. The Doppler frequencies of the direct signals can be directly adopted as the Doppler frequencies of the reflection signals. In this way, the generation of GNSS marine reflection signals is realized based on the factors of time delay, Doppler frequency and power. The above generation method for complicated marine reflection signals is simplified based on the approximately fitting method, so that the simulation of the reflection signals is practicable and feasible. Therefore, the method lays a foundation for the development of GNSS reflection signal simulators.

Description

technical field [0001] The invention relates to a method for generating an airborne GNSS ocean reflection signal, belonging to the technical field of GNSS-R. Background technique [0002] GNSS-R technology is a new remote sensing technology. It is developed on the basis of the wide application of GNSS system. It mainly uses the signal source provided by GNSS system to detect sea surface wind field, sea surface height and effective wave height through its reflected signal. , seawater salinity, soil moisture and other geophysical parameters, and carry out corresponding inversion. Compared with other marine remote sensing technologies, GNSS-R has the advantages of high temporal and spatial resolution, low cost, abundant signal sources, and high mobility. Insufficient detection means. Therefore, GNSS-R technology has important application prospects in marine environment monitoring. [0003] At present, a lot of achievements have been made in the modeling and application of re...

Claims

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Application Information

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IPC IPC(8): G01S7/40G01S13/88
CPCG01S7/4052G01S13/88
Inventor 张波祁永强杨东凯李博闻
Owner BEIHANG UNIV
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