The Reflection Signal Receiver (GNSS-R) is a mission payload of the FORMOSAT-7 Reflectometry satellite which is designed and built by the NSPO.  The instrument receives earth surface reflected GNSS signals from a low earth orbit, and then processes digitized signals into Level-1 data on board. The Level-1 data will be downloaded to ground station for science data retrieving such as ocean surface roughness and wind speed, etc. It is expected this mission will promote the GNSS-R application to extreme weather prediction such as typhoon track and category.

The use of GNSS (Global Navigation Satellite System) signals for positioning, navigation, and timing (PNT) of personnel, vehicles, and autonomous platforms have become routine in our society. As GNSS signals are essentially omnipresence, many new applications have been envisioned to exploit the unique signal characteristics and well-maintained infrastructure of GNSSs. The use of GNSS for remote sensing and environmental monitoring has been an important research topic in recent years due to the omnipresence and performance of GNSS signals. The FORMOSAT-3 and the FORMOSAT-7 (mission satellites) have exploited the potential of GNSS-based radio occultation for profiling the ionosphere and atmosphere so that better understanding of space weather and higher accuracy in numerical weather prediction are achieved. In addition to occultation through the refraction of GNSS signals, reflection of GNSS signals is becoming an important remote sensing tool in probing sea surface height, wind velocity, salinity, soil moisture, roughness, and snow depth. 
The FORMOSAT-7 Reflectometry satellite equipped with a GNSS reflection signal receiver (GNSS-R Receiver) as mission payload. The FORMOSAT-7 Reflectometry satellite will orbit in Low Earth Orbit (LEO) to collect GPS reflection signal from sea surface.  The GNSS-R Receiver will digitize and process the reflection signal into Delay Doppler Map (DDM) data. DDM data is then downloaded to ground for science data retrieving to such as ocean surface roughness and wind speed, etc. It is expected this satellite mission will promote the GNSS Reflectometry application to extreme weather prediction such as typhoon track and category.
The GNSS-R receiver development is based on National Space Organization (NSPO) in-house space-grade GPS receiver technologies. In Year 2016, two GNSS-R Receiver airborne flight tests have been conducted to verify system design and performance of the receiver. An engineering model (EM) is now integrated with the satellite engineering development model (EDM) and the interfaces and functions of the receiver have been checked. An engineering qualification model (EQM) is also built and a series of environment qualification tests were scheduled. The receiver flight model (FM) is under manufacture and will be ready by end of this year. The FORMOSAT-7 Reflectometry satellite is expected to be launched in Year 2020.

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