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A fuzzy elimination method based on multi-satellite gnss‑r sea surface target positioning

A target positioning and target technology, which is applied in the field of multi-satellite GNSS-R sea surface target positioning blur elimination, can solve problems such as target positioning blur, and achieve the effect of improving resolution.

Active Publication Date: 2017-08-08
BEIHANG UNIV
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Problems solved by technology

[0005] The object of the present invention is to: in order to solve the problem of target positioning ambiguity caused by the fact that the points with the same time delay and Doppler in the space area are not unique, provide a method for eliminating ambiguity based on multi-satellite GNSS-R sea surface target positioning

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  • A fuzzy elimination method based on multi-satellite gnss‑r sea surface target positioning
  • A fuzzy elimination method based on multi-satellite gnss‑r sea surface target positioning
  • A fuzzy elimination method based on multi-satellite gnss‑r sea surface target positioning

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Embodiment Construction

[0038] See Figure 1.1 — Image 6 , the present invention is based on a multi-satellite GNSS-R sea surface target positioning fuzzy elimination method, and the specific steps of the method are as follows:

[0039] Step 1: The receiver receives the direct signal through the right-hand polarized antenna, and receives the reflected signal through the left-hand polarized antenna. Due to the weak GNSS scattering signals on the sea surface, antennas with different gains are required at different platform heights. For low-orbit satellite platforms at 400km to 3800km, a high-gain array antenna with a gain greater than 20dB is usually required. The GNSS signal reflected by the sea surface is processed by Doppler delay mapping receiver (DDMR) to obtain a higher gain for analysis. The time delay-Doppler two-dimensional correlation function of the reflected signal is

[0040]

[0041] where T i is the integration time, f c is the center frequency of the received signal, f d For l...

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Abstract

The invention discloses a multi-satellite GNSS-R sea-surface target positioning ambiguity eliminating method. The method comprises the following four steps: step one, receiving direct signals by a right-handed rotation polarization antenna and receiving reflection signals by a left-handed rotation polarization antenna of a receiver; step two, detecting the existence of a target by obtaining a maximum value of correlation power of a detection region by a target detection module and determining a time delay Dropper coordinate of a correlation power peak value as a time delay Dropper coordinate (t, fd) of the position of the target; step three, converting the obtained time delay Dropper coordinate (t, fd) of the target into a geodetic coordinate (lon, lat and h), thereby positioning a marine target; step four, combining detection results of a plurality of satellites, eliminating the influence of virtual points in a plurality of target positioning results, thereby determining a real physic coordinate of the target. The multi-satellite GNSS-R sea-surface target positioning ambiguity eliminating method has a practical value in the technical field of ocean remote sensing and passive radar target detection.

Description

technical field [0001] The invention relates to a multi-satellite GNSS-R based sea surface target positioning fuzzy elimination method, which belongs to the technical field of marine remote sensing and passive radar target detection. When a large target appears in the sea surface detection area, a solution is proposed to solve the problem of positioning ambiguity in the sea surface target detection and positioning system of the spaceborne receiver platform. There are two types of multi-satellite positioning ambiguity elimination: (1) multi-satellite reception-single-satellite transmission model (2) single-satellite reception-multi-satellite transmission model. Background technique [0002] GNSS-R (GNSS-Reflection) remote sensing technology is a new branch developed since 1997, and it is one of the research hotspots in the field of remote sensing and navigation technology at home and abroad. GNSS-R uses the L-band signal of navigation satellites as the emission source, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/42G01S7/41
CPCG01S19/42
Inventor 杨东凯齐雅男沈海鸿高超群
Owner BEIHANG UNIV