本論文敘述以雙頻接收儀利用架設於海堤並指向海面之左旋圓形偏極化天線接收以GPS衛星當作訊號源於海面反射之反射訊號，同時以10 Hz之頻率接收5顆以上GPS衛星之反射訊號，利用直接訊號與反射訊號兩者之雙頻相位觀測量與兩訊號所解算之高程差異求得海面高程，並利用都卜勒頻移估算出海面波浪起伏垂直方向的變化速率，實驗結果（一）顯示由GPS衛星PRN 11、PRN 25與PRN 31海面反射訊號解算之平均海面高程為 -1.085 m，最大波高變化速率介於 -7 m/s ~ 7 m/s之間。實驗結果（二）顯示由GPS衛星PRN 5、PRN 12、PRN 18與PRN 30海面反射訊號解算之平均海面高程為 0.451 m，最大波高變化速率介於 -0.55 m/s ~ 0.65 m/s之間。海面反射點高程變化經過一維穩態小波轉換濾波器濾波後，可看出海面之波浪起伏，本研究之優點為可以取得連續密集的資料並可即時解算，可應用於水位觀測。

This thesis narrates that utilizes a left-hand circularly polarized antenna which was located on the sea wall and pointed to the sea surface. This equipment could receive the measurements of the global positioning system (GPS) carrier phase with 10 Hz sample rate after reflection on the sea surface and estimate the altitude of sea surface, waveforms, and vertical variation velocity of tide. The results (1) present that average sea level is -1.085 m which estimated from the reflected signal of PRN 11, PRN 25 and PRN 31. Using Doppler shifts and ocean reflection positions altitude to conduct the velocity of sea states are among –7 m/s ~ 7 m/s. The results (2) present that average sea level is 0.451 m which estimated from the reflected signal of PRN 5, PRN 12, PRN 18 and PRN 31. Using Doppler shift and ocean reflection positions altitude to conduct the velocity of sea states are among –0.55 m/s ~ 0.65 m/s. Through the Stationary Wavelet Transform De-noising 1-D filter, author can obtain sea level variation. The system provides GPS reflection continuous data, and real-time geodetic solutions. Meanwhile, the future application is including water level observations.

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