## 1 Introduction  
The ocean is a vast reservoir of resources, rich in oil, natural gas, and other mineral resources [1]. Ocean exploration is an essential means of recognizing the ocean and understanding it. Collecting various data on the ocean through ocean exploration instruments can help us have a comprehensive understanding of the ocean [2, 3, 4]. Detection instruments can be mounted on platforms such as Argo buoys, underwater gliders, and marine robots, which are operational within the oceanic realm. Among these, Argo buoys are particularly advantageous in ocean profile detection and are extensively used for the acquisition of marine profile data. Argo buoys equipped with conductivity temperature depth (CTD) sensors can collect sectional temperature, salinity, and depth information through ascent and descent movements [5]. With the advancement of satellite communication technology, the acquisition of profile information collected by buoys has improved from the past, when data could only be obtained after the buoys were recovered, to real-time acquisition using remote data transmission [6; 7]. Many researchers use Iridium systems, maritime satellite systems, and Argos systems for satellite communications [8; 9; 10], but these satellites are developed and operated by other countries. All transmitted information is passed through other countries' satellite systems, causing a high risk of data leakage in our coastal waters. In this context, the BeiDou Satellite Navigation System, an independent development of our nation, offers a secure alternative. It provides high-precision, high-reliability services for positioning, navigation, and timing to users across the globe, in addition to capabilities for short message communication [11; 12]. After the buoy floats to the sea surface, it is positioned by the Beidou module (BDM), and profile information and location information are sent to shore via Beidou satellites, achieving remote data transmission and real-time positioning [13]. The buoy needs to perform data processing on the data and transform it into a format that conforms to the Beidou communication to realize the remote transmission, which increases the burden in the main control board of the buoy, the risk of error, and the difficulty of debugging and testing. Therefore, a separate Beidou transparent transmission terminal (BTTT) is designed for the data remote transmission part. Based on the original function, the shore-based remote control function is added to analyze the data and realize the corresponding functions for the remote information sent from the shore. The buoys are far from land and are powered by batteries with only limited power, making low-power design an essential part of the design for satellite communication terminals. In 2016, [PERSON] [1] of the National University of Defense Technology proposed disconnecting the power supply of satellite communication-related modules and devices during non-satellite over-topping periods to reduce power consumption. The power supply is re-powered during satellite over-topping to restore the normal operating status of these modules and devices. Nonetheless, given the satellite overhead cycle repeating roughly every 90 min for only about 8 min, the inability to transmit the profiling data of a buoy within this brief period necessitates prolonged waits for subsequent satellite passes, leading to substantial waiting times. [PERSON] et al. [8] of Tianjin University addressed power management for Iridium communication modules by employing a real-time clock to schedule power on and off. Since the buoy's operational timing in ocean exploration can fluctuate due to environmental factors, this power scheduling adversely impacts the success rate of remote communication. There are fewer studies [1; 8] on the low-power design of satellite communication terminals, and many scholars have conducted plenty of research on the low-power design of ocean observation equipment, which is of great reference significance.