Impact of Specular Point Estimation Inaccuracies on TechoDemoSat-1 GNSS-Reflectometry Observables Over Oceans

This paper presents an assessment of the effects of specular point (SP) estimation inaccuracies on the Signal to Noise Ratio peak (SNR PEAK ) used for ocean wind speed retrievals from TechDemoSat-1 (TDS-1) Delay Doppler Maps (DDMs). Results show that the more inaccurate the estimated Doppler frequency at the SP, the lower the intensity of the SNR PEAK . Differences may be up to 2 dB.