Ground-based gnss direct reflection signal carrier interferometry device for river velocity measurement

Abstract

The invention discloses a land-based GNSS direct reflection signal carrier interference measurement device for river flow velocity, which relates to the technical field of river flow velocity monitoring. Polarized antenna, GPS L1 / Beidou B1 dual-mode navigation module, four-channel RF front-end, multi-channel direct / reflected signal co-processing module, and river velocity inversion module, use the LCHP antenna to receive signals at high altitudes, which not only can receive low High-angle GNSS reflection signals, and can also receive high-altitude signals through the right-handed circularly polarized antenna, the left-handed circularly polarized antenna, the dual-mode navigation module, four-channel RF front-end, and multi-channel direct / reflection The signal co-processing module and the river velocity inversion module measure the river velocity, thereby improving the accuracy of the river velocity measurement.

Description

technical field [0001] The invention relates to the technical field of river flow velocity monitoring, in particular to a device for measuring river flow velocity by ground-based GNSS direct reflection signal carrier interference. Background technique [0002] As an important hydrological parameter, river velocity is one of the long-term concerns in the field of inland remote sensing. At present, the flow velocity measurement of most rivers is mainly based on contact measurement such as tachometer. In harsh working scenes or complex terrain conditions such as flood periods, contact measurement methods are greatly limited. In view of the shortage of contact measurement, some non-contact measurement methods have emerged. Non-contact measurement methods mainly include ground wave radar remote sensing, aerial photography, etc. The measurement equipment or platform is erected on river banks, bridges and in the air to measure river flow velocity by using optical, electromagnetic...

AI Technical Summary

Problems solved by technology

At present, the method of measuring the time delay of the reflected signal relative to the direct signal based on the carrier phase is the single-antenna interferometry. The frequency is measured by using the oscillation formed by the interference of the reflected signal to the direct signal. The receiving and processing device of the single-antenna interferometry only uses a GPSL1 / Beidou B1 dual-frequency right-hand circularly polarized antenna receives direct and reflected signals at the same time. increase, the right-handed polarization component of the GNSS reflection signal weakens, and the left-handed polarization component increases, so that it can only use satellite signals with low altitude angles at most, and cannot apply satellite signals with arbitrary altitude angles. Therefore, the measured river flow velocity does not Inaccurate

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