GNSS-R Ocean Altitude Detection Technology Based on Carrier Phase Assistant

摘要

GNSS-R is a new branch of GNSS which has been developed since the 1990s. It can be applied to remote sensing exploration of marine environment and remote sensing of terrestrial environment. GNSS-R has many advantages over other remote sensing techniques, such as remote sensing, Low cost, low power consumption, high spatial and temporal resolution, and many other advantages of the project can be detected. GNSS-R marine remote sensing detection technology mainly through high-gain reflection antenna to receive the GNSS reflection signal from the sea to complete the marine environmental detection, the reflected signal carries changes in signal waveforms, changes in polarization characteristics, amplitude, phase, and frequency. In this paper, a GNSS-R ocean height detection technique based on carrier phase assistant was introduced. The conventional channel accomplishes the initial acquisition of the signal and outputs the original DDM pattern by the time delay-Doppler mapping correlator, DDM diagram can be used to complete the inversion of the wind field, etc., while the DDM map contains the reflected signal doppler, time delay information, the accuracy of doppler and time delay was determined by the DDM Doppler interval and the time interval. The processor can process the time delay of the reflected signal to obtain a roughly phase and doppler information. The closed-loop acquisition and tracking of the signal was completed by the time information and doppler information obtained by the reflection. By calculating the direct and reflection channel carrier phase, pseudo-range difference for the sea surface height inversion. In order to verify the inversion accuracy of the system, in this paper, the ground-based test and flight test was carried out using the self-research phased-array GNSS-R ocean reflection receiver system. The experimental data showed that the inversion error of sea surface height was better than 10 cm.