Method for improving gain of GNSS-R (Global Navigation Satellite System-Receiver) antenna based on dual-circularly polarized phased-array antenna model
A phased array antenna and dual circular polarization technology, applied in the cross field, can solve the problem of narrow beam width and achieve the effect of increasing the gain
Pending Publication Date: 2021-11-09
CHINA ACADEMY OF SPACE TECHNOLOGY
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However, the antenna gain is inversely proportional to the beamwidth, and the beamwidth of a high-gain antenna is narrower than that of a low-gain antenna, which makes the instantaneous coverage area of a high-gain antenna smaller than that of a low-gain antenna
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[0053] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments disclosed in the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0054] One of the core ideas of the present invention is: based on the theory of scattering coherent signal processing on the earth's surface, a new dual circularly polarized phased array antenna model of the GNSS-R measurement system is established. This model uses a novel dual circularly polarized phased array antenna to generate a high-gain beam with scanning capabilities. Compared with the traditional element antenna method, the new dual circularly polarized phased array antenna model proposed by the present invention effectively improves the gain of the GNSS-R antenna without affecting the coverage, and provides a high-precision and high-spatial-resolution GNSS in the future. -R sea surface altimetry verification star provides ant...
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The invention discloses a method for improving gain of a GNSS-R (Global Navigation Satellite System-Receiver) antenna based on a dual-circularly-polarized phased-array antenna model. The method comprises the following steps: constructing the dual-circularly-polarized phased-array antenna model; determining the power Pt of a GNSS satellite transmitting signal, the gain Gt of a GNSS satellite transmitting antenna and the efficiency eta of a GNSS-R satellite antenna; according to Pt, Gt and eta, through a dual circular polarization phased-array antenna model, calculating to obtain a first signal-to-noise ratio and a second signal-to-noise ratio, and carrying out integration processing on the sum to obtain a fused signal-to-noise ratio SNRiR; according to the fused signal-to-noise ratio SNRiR, calculating to obtain height measurement precision sigma iR; and according to the height measurement precision sigma iR, calculating to obtain the surface altitude at the mirror reflection point. On the premise of not influencing coverage, the gain of the GNSS-R antenna is effectively improved, and an antenna design theoretical method and key technical support are provided for future high-precision and high-spatial-resolution GNSS-R sea surface height measurement verification satellites.
Description
technical field [0001] The invention belongs to the intersecting technical fields of satellite altimetry and electronic signal science, and in particular relates to a method for improving GNSS-R antenna gain based on a dual circularly polarized phased array antenna model. Background technique [0002] As a new technology of microwave remote sensing, Global Navigation Satellite System Reflectometry (GNSS-R) has the advantages of rich signal sources, low cost, low power consumption, and can be measured all-weather and all-weather. Since Martin-Neira first proposed the concept of PARIS (PAssive Reflectometry and Interferometric System) in 1993, a large number of theoretical and experimental studies have verified the feasibility of GNSS-R measurement technology. In 2010, Larson et al. conducted ground-based GNSS-R measurements and obtained surface soil moisture information. In 2012, Egido et al. applied ground-based GNSS-R technology to the field of agricultural remote sensing,...
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Login to View More IPC IPC(8): G01S19/37H01Q21/00
CPCG01S19/37H01Q21/00
Inventor 郑伟吴凡崔镇
Owner CHINA ACADEMY OF SPACE TECHNOLOGY