River boundary and width detection method of land-based GNSS reflectometer
A detection method and reflectometer technology, which are applied in the direction of reflection/re-radiation of radio waves, measurement devices, and utilization of re-radiation, etc., can solve the problems of low resolution, inaccurate detection results, and inaccurate detection results, and achieve correction. gain effect
Active Publication Date: 2021-09-21
BEIHANG UNIV
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Problems solved by technology
[0003]1. Remote sensing technology: such as current velocity camera and VHF radar technology, but this technology only realizes detection through empirical relationship, making the detection result inaccurate
[0004] 2. Using methods such as synthetic aperture radar (SAR) imaging and spaceborne radar altimeter for detection, but the sampling rate of this method is low, and the resolution is low due to the influence of the atmosphere, resulting in inaccurate detection results
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[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0049] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0050] The Global Navigation Satellite System (GNSS) reflection signal realizes the inversion and monitoring of surface physical parameters through cooperative reception and processing of direct and ground-reflecte...
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The invention relates to a river boundary and width detection method of a land-based GNSS reflectometer. The method comprises the following steps: acquiring a reflected signal, a direct signal and a roughness factor of each destination; for any destination, alternately converting the radio frequency channel of the reflected signal and the radio frequency channel of the direct signal in a set period to obtain a signal set; obtaining the power of each signal in the signal set according to the signal set; obtaining reflection power before conversion and reflection power after conversion according to the power of each signal; correcting the roughness factor according to the reflection power before conversion and the reflection power after conversion to obtain a correction factor; calculating the reflectivity based on the correction factor, the antenna gain for receiving the reflected signal and the antenna gain for receiving the direct signal; determining the land and river condition of the target land according to the reflectivity and a set threshold value; and obtaining the boundary and width of the river according to the land-river condition of each destination. According to the invention, the boundary and width of the river can be accurately detected.
Description
technical field [0001] The invention relates to the field of river detection, in particular to a river boundary and width detection method of a land-based GNSS reflectometer. Background technique [0002] At present, the common methods for detecting river boundary and width detection are: [0003] 1. Remote sensing technology: such as current velocity camera and VHF radar technology, but this technology only realizes detection through empirical relationship, making the detection results inaccurate. [0004] 2. Using methods such as synthetic aperture radar (SAR) imaging and spaceborne radar altimeter for detection, but the sampling rate of this method is low, and the resolution is low due to the influence of the atmosphere, resulting in inaccurate detection results. Contents of the invention [0005] The purpose of the present invention is to provide a river boundary and width detection method of a land-based GNSS reflectometer, which can accurately detect the boundary an...
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IPC IPC(8): G01S13/00G01B7/02G01C13/00
CPCG01S13/003G01C13/00G01B7/02Y02A90/30
Inventor 杨东凯许志超王峰邢进
Owner BEIHANG UNIV