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案例分享 | 基于北斗消息通信實現遠程多組分溫室氣體監測
本實驗成果發布于IEEE SmartIoT 2023，國際智能物聯網會議。
The relevant paper was published in 2023 IEEE International Conference on Smart Internet of Things.
引言
偏遠地區的無線傳輸資源有限，衛星通信則不受此限制。然而現有民用的衛星通信帶寬具有局限性。該研究項目將實測數據經過壓縮，最大化利用北斗短報文有限的字符數，并且嘗試了加密算法，保證了碳監測數據的安全性。
Introduction
Wireless transmission resources in remote areas are limited, whereas satellite communication is not subject to such constraints. However, existing civilian satellite communication bandwidth has limitations. This research project compresses measured data, maximizing the use of the limited character count in Beidou short messages, and explores encryption algorithms to the security of carbon monitoring data.
實驗：通信成功率
Experiments: communication successful rate
定義：數據延遲在1分鐘內被定義為成功。
地點：寧波，中國
Definition: data delay within 1 min is defined as successful
Test site: Ningbo China (29°47'53''N, 121°33'46''E)
01
實驗一：半暴露平臺
通信成功率：82.5%
Semi-exposed platform
Success rate: 82.5%
02
實驗二：開放空間
通信成功率：92%
Open space
success rate: 92%
結論
Conclusions
(1) 系統功耗System power
HT8850：100瓦
通信：每次傳輸峰值17.5瓦，持續時間<0.3秒，幾乎不影響電池壽命。
HT8850: 100W
Communication: peak 17.5W for <0.3 secons duration per transmission, barely influencing the battery life
(2) 最終實現了兩種傳輸模式Two transmission modes were ultimately implemented
第一種為單一用戶模式，用戶擁有自己的北斗接收模塊，經過處理后的數據由樹莓派實現靈活性高的數據獲取。
第二種模式支持北斗數據上云，多個擁有權限的用戶能夠透過人性化的網頁界面，從云端獲取實時數據。
The first is a single-user mode, where each user has their own Beidou receiving module, and the processed data is obtained with high flexibility through a Raspberry Pi.
The second mode supports uploading Beidou data to the cloud, where multiple authorized users can access real-time data via a user-friendly web interface.
