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500 ms and that to the moon surface is 2.6 sec. Moreover, the RTT for Mars is more than 13 minutes at maximum. As a result of higher bit error rate for the Ka band and Ku band due to weather conditions, compared to the X band or S band, packet loss increases in IP transmission. In a network with high latency and packet loss, it is well known that the throughput of TCP decreases largely and it is not easy to realize high-speed TCP transmission in satellite link.We developed a novel protocol to realize high-speed data transfer in networks with high latency and packet loss, named HpFP [3][15][16]. e HpFP is designed based on UDP, and is a transmission protocol in transport layer to ensure the arrival of packets in the same manner as TCP. We measured transmission speed in the WINDS experi-ment and achieved an almost theoretically maximum rate of 1.6 Gbps for single connection. Moreover, we improved HpFP by implementing the CRC function. We detected an error rate for WINDS and discovered that the error detec-tion for all packets is possible if the throughput of WINDS is 100 Mbps.In this paper, we investigated the correlation between the PLR and the number of error detections by CRC ob-tained for the case of throughput of 10 Mbps. As a result, the correlation between both was not so large, and there was a case that the number of error detections by CRC was low even when packet loss reached several tens of percent. To the contrary, there was a case where the PLR was 0% even when the case that the number of error detections by CRC was not zero. We checked the correlation estimation every second, and it is not a sucient time period for more than ten thousand packets to arrive. In addition, the PLR is not inuenced by multiple bit errors occurring in one packet. It implies that the correlation between both be-comes lower when bit error rate is higher. erefore, we need to further discuss the evaluation method to derive the correlation. Since it is not possible to conduct measure-ments simultaneously in this system, we will discuss the eect of the quality of satellite link on data transmission by comparing BER measurement, CRC measurement, and PLR.AcknowledgmentWe thank to the members of Clealink Technology Co., Ltd. and Hotel Route-Inn Nakatsugawa Inter for their sup-port and cooperation. is paper is supported by the grants of Ministry of Internal Aairs and Communications SCOPE (No. 165009001), and JSPS JP15 K06129, JP17 K00158, and JP17 HP8019.ReferenceR1K. Suzuki, M. Yahata, M. Kato, T. Watanabe, K. Hoshi, T. Okui, S. Yoshikawa, M. Yoneda, Y. Arakawa, T. Asai, T. Takahashi, and M. 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