GNSS occultation signal continuous receiving method of aerostat platform and receiving antenna system

Abstract

The invention discloses a GNSS occultation signal continuous receiving method of an aerostat platform and a receiving antenna system, and continuous receiving of GNSS occultation signals can be achieved. The air GNSS occultation detection based on the aerostat platform has the advantages of being long in standing time, long in single occultation event time, free of multipath effect compared with foundation observation and the like. However, the aerostat platform has attitude uncertainty, the azimuth angle of the aerostat platform is fixed for a single occultation event, and a single antenna cannot realize continuous receiving of occultation signals, so that occultation observation data is unavailable; according to the invention, through effective combination of multiple antennas, continuous receiving of occultation signals can be realized; besides, the occultation signals are shielded by the curvature of the earth, the lower the cutting point height is, the lower the signal strength is, so the receiver cannot continuously track the signals; according to the invention, the OCCU antenna array element multi-oscillator layout structure can achieve 10dB antenna gain in the occultation direction and can effectively receive the occultation signals with weak carrier-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to a method for continuously receiving GNSS occultation signals based on an aerostat platform and a receiving antenna system. Background technique [0002] The low atmospheric layer has the characteristics of uneven atmospheric refraction distribution, which will cause refraction and scattering effects on the propagation of radio signals. When GNSS radio signals pass through the lower atmosphere, due to the existence of the refractive index gradient, the radio wave signal will be bent, so that the receiver can observe signals below the horizon, this phenomenon is called a GNSS occultation event. Using this bending information, the GNSS receiver can retrieve the atmospheric refractive index, and can further retrieve the corresponding atmospheric physical parameters including density, temperature, water vapor, and ionospheric electron density. This is the radi...

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Problems solved by technology

[0004] However, the inversion of GNSS occultation signals requires continuous tracking signals, and the payload cabin of the near-space aerostat platform is suspended in the air, and its payload will swing or rotate with the wind, that is, its attitude will change randomly (the heading angle swings particularly prominent), resulting in discontinuous reception of occultation signals

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