導航衛星反射訊號接收儀

GNSS (Global Navigation Satellite System) Reflectometry (GNSS-R)

導航衛星反射訊號接收儀（GNSS-R）是國家太空中心「獵風者衛星」的任務酬載，完全由國家太空中心與國內學研界共同研製。其主要用以接收GNSS衛星L波段的反射訊號，利用衛星飛行於海洋上方接收反射訊號，進而反演海面粗糙度及海面風速等海面風場資料，透過資料同化方式，有助於瞭解颱風結構之發展──提升預報準確度。

GNSS-R is a mission payload of Triton satellite which is designed and built by NSPO. GNSS-R mainly receives the L-band reflection signal of the GNSS satellites. When Triton satellite flying above the ocean, the received reflection signal can be retrieved to calculate the sea surface roughness and the sea surface wind speed. Through data assimilation, the obtained sea surface wind field data will be helpful to perceive the development of typhoon structure and improve forecasting accuracy. In addition to the observation of ocean surface winds, GNSS-R can also be applied to land applications. The reflection signal can also be used for detection of land water distribution, vegetation, soil moisture and other applications. At present, NSPO team has completed the fabrication of GNSS-R Flight Model (FM), which is in the phase of the integration and test (I&T) with the Triton satellite. Several flight tests have been conducted for the validation, calibration, and science data retrieval.