Communication mode switching method

Abstract

The application discloses a communication mode switching method, and belongs to the technical field of satellite communication terminal control. The method is applied to a multi-mode communication terminal integrated with a folding antenna, a Hall sensor, a PTT button and a main control module. Firstly, the type of a SIM card is automatically recognized and corresponding satellite communication parameters are pre-configured in the starting stage. In the standby state, the antenna unfolding state is monitored in real time through the Hall sensor. When the antenna is unfolded to a preset angle, a detection time window is started. In combination with the pressing state of the PTT button in the window, two-dimensional combination judgment is carried out. If the button is not pressed, the satellite communication mode is automatically entered and satellite searching and network entry are executed. If the button is pressed, the intercom communication mode is automatically entered. After the antenna is folded, the current mode is automatically exited and the low-power standby state is returned.

Description

Technical Field

[0001] This invention belongs to the field of satellite communication terminal control technology, specifically relating to a communication mode switching method. Background Technology

[0002] With the increasing demands for communication support capabilities in scenarios such as emergency rescue, field operations, maritime communications, and military operations, terminals with a single communication mode can no longer meet the full-scenario communication needs in complex environments. Integrating traditional digital intercom, Tiantong-1 high-orbit satellite communication, and low-orbit broadband satellite communication into a single handheld terminal, achieving multi-mode fusion of "short-range intercom + high-orbit satellite voice + low-orbit satellite data," has become a core development direction for the satellite communication terminal industry. The corresponding communication mode switching method directly determines the terminal's ease of operation, emergency response speed, and reliability, and is one of the core control technologies of multi-mode terminals.

[0003] Currently, the multi-mode communication terminals available in the industry mainly fall into three categories in terms of mode switching methods, and all of them have obvious technical limitations: The first type is a purely mechanical switching scheme. Represented by the Chinese utility model patent with authorization announcement number CN222813939U, this scheme achieves antenna path switching between low-Earth orbit (LEO) satellite and Tiantong satellite modes through the physical rotation of the internal movable radiating arm of the antenna. From the perspective of the switching method, this scheme relies entirely on the user manually rotating the antenna structure to achieve mode switching; it is essentially a purely mechanical hard switch without any intelligent judgment logic. Users cannot quickly trigger the corresponding mode through operational intentions, and precise control of the rotation angle is required during the switching process, resulting in a high operational threshold. Furthermore, this scheme only covers two satellite communication modes and completely ignores the switching of intercom communication modes, indicating a fundamental lack of mode coverage.

[0004] The second type is the single-condition automatic triggering scheme. Represented by existing mainstream foldable Tiantong satellite terminals, these have a built-in antenna status detection mechanism. When the user unfolds the antenna, the terminal automatically initiates the satellite search process. This scheme achieves automatic triggering in a single scenario, but it has significant drawbacks in terms of the switching method: the triggering condition is limited to the single dimension of "antenna unfolding," failing to distinguish the user's true intention in unfolding the antenna; the user unfolding the antenna could be for both satellite communication and intercom communication, and a single condition can only trigger satellite communication mode, failing to achieve automatic triggering of intercom mode; if the user needs to use the intercom function, they still need to manually enter the system menu to switch modes, not fundamentally solving the problem of automatic switching between multiple modes. Furthermore, this type of terminal typically only supports Tiantong satellite and public network modes, incompatible with low-Earth orbit satellite communication, resulting in very limited adaptability scenarios for the switching method.

[0005] The third type is the purely manual menu switching solution. Represented by existing multi-mode integrated intercom terminals, these terminals integrate multiple communication modules such as intercom, satellite, and public network. However, all mode switching requires the user to enter the system settings menu via buttons, select the target communication mode step by step, and confirm the change. This solution has the most primitive switching logic and cumbersome operation steps, typically requiring 3-5 button presses to complete a single mode switch. In time-sensitive scenarios such as emergency rescue and sudden disasters, manual switching can severely delay communication opportunities and even cause delays in rescue and support. Furthermore, frequent menu operations increase the user's learning curve and the probability of misoperation.

[0006] From a technical perspective, existing technologies for switching communication modes generally suffer from the following three core deficiencies: Existing automatic switching solutions rely solely on antenna status for mode determination, failing to recognize differentiated user intent. They either trigger only a single mode or are prone to false triggers. While manual solutions offer acceptable accuracy, they are entirely dependent on human judgment, lacking automation and fundamentally failing to address the technical challenges of intelligent judgment. Currently, the industry lacks a switching method that combines "antenna physical status + button operation status" for dual-dimensional judgment, making it impossible to accurately match the user's true intent through a combination of these two operations.

[0007] In existing solutions, except for a single satellite mode which can be automatically triggered, all other mode switching requires user intervention through menu operations. This process is lengthy and involves many steps, making it impossible to achieve rapid activation in an emergency. Especially for emergency communication terminals, the speed of mode switching directly affects the timeliness of communication support, and the operational efficiency of existing methods cannot meet the needs of highly emergency scenarios.

[0008] Existing switching methods only support switching between a maximum of two communication modes, and are concentrated between satellite and public networks. There is no automated switching method that simultaneously covers three professional communication modes: walkie-talkie, Tiantong satellite, and low-Earth orbit satellite. At the same time, existing methods cannot automatically identify the type of satellite card inserted by the user, requiring the user to manually configure parameters such as frequency band and protocol. The level of intelligence is low, the compatibility of satellite cards from different operators is poor, and the user threshold is high. Summary of the Invention

[0009] The purpose of this invention is to provide a communication mode switching method to solve the problems mentioned in the background art.

[0010] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A communication mode switching method, applied to a multi-mode communication terminal integrating a foldable antenna, Hall sensor, PTT button, SIM card slot and main control module, includes the following steps: S1. The terminal is powered on and initialized. The main control module reads the SIM card information in the SIM card slot, determines the SIM card type, and configures the satellite communication parameters of the radio frequency front-end module accordingly. S2. The main control module enters standby mode and continuously monitors the antenna status level signal output by the Hall sensor. S3. When the Hall sensor detects that the folded antenna has been unfolded to a preset angle and outputs an antenna unfolding signal, the main control module triggers an interrupt and starts a detection time window of a preset duration. S4. Within the detection time window, the main control module detects the pressing status of the PTT button: if the PTT button is not pressed, it is determined that the satellite communication mode has been entered, and the satellite assistant is started to perform the satellite search and network access process; if the PTT button is pressed, it is determined that the intercom communication mode has been entered, and the intercom application is started to enter the intercom standby state. S5. When the Hall sensor detects that the folded antenna has returned to the folded position, the main control module exits the current communication mode and the terminal returns to the standby state.

[0011] Furthermore, in step S1, the SIM card type includes an L card corresponding to low-Earth orbit satellite communication and an S card corresponding to Tiantong satellite communication; if it is identified as an L card, the low-Earth orbit satellite communication frequency band and left-hand circular polarization parameters are configured; if it is identified as an S card, the Tiantong satellite communication frequency band and left-hand circular polarization parameters are configured.

[0012] Furthermore, in step S3, the duration of the preset detection time window ranges from 0.5 to 2 seconds; the time window is timed using a hardware timer and is triggered by an interrupt signal.

[0013] Furthermore, in step S3, the preset unfolding angle of the folded antenna is 180°~225°; the Hall sensor is a switch-type Hall sensor, which outputs a high-level antenna unfolding signal when the antenna is unfolded to the preset angle.

[0014] Furthermore, in step S4, when detecting the PTT button press state, button debounce processing is added: continuous sampling is performed at fixed intervals, and the state is determined to be valid when multiple sampling results are consistent, thus eliminating mechanical jitter interference.

[0015] Furthermore, step S4 also includes a press duration recognition step: a press duration of less than 0.5 seconds is determined as a short press and enters the standard intercom mode; a press duration of more than 1 second is determined as a long press and enters the emergency call mode.

[0016] Furthermore, in step S5, when the antenna returns to the folded position, the main control module sequentially shuts down the RF front-end power amplifier, closes the communication application, releases system resources, and finally restores the low-power standby state.

[0017] Furthermore, in step S3, a linear Hall sensor is used to detect the antenna deployment angle in real time, and multiple angle thresholds are set. Different angles correspond to different power consumption and operating modes of the terminal.

[0018] Furthermore, after completing the mode switching in step S4, a status feedback step is also included: the current communication mode and working status are fed back to the user through different colors of LED indicators, flashing frequencies, and voice prompts.

[0019] Furthermore, in step S4, the satellite communication mode satellite search and network access process specifically includes: powering on the radio frequency channel, pilot signal scanning, carrier tracking, channel demodulation, network registration, and standby readiness.

[0020] Beneficial effects: This invention breaks through the technical limitations of existing single-condition triggering and pioneers a two-dimensional combination judgment logic of "antenna deployed state + PTT button state". Through cross-verification of two independent physical operations, it accurately identifies the user's true operation intention. Deploying the antenna without pressing PTT corresponds to satellite communication, while deploying the antenna and pressing PTT at the same time corresponds to walkie-talkie communication. This fundamentally eliminates the problem of false triggering caused by single-condition triggering, and improves the accuracy and reliability of mode switching by an order of magnitude.

[0021] This invention eliminates the cumbersome process of manual menu-based switching. Users can directly enter the corresponding communication mode in one step through only two intuitive physical operations: "deploying the antenna" and "pressing the PTT." No screen or menu operation is required throughout the process. The operation steps are reduced from 3-5 steps to 1-2 steps, shortening the mode activation time by more than 80%. In time-sensitive scenarios such as emergency rescue and sudden disasters, this significantly improves communication response speed, saving valuable time for emergency response. This invention simultaneously covers three professional communication modes: walkie-talkie communication, Tiantong satellite communication, and low-Earth orbit satellite communication. It is the first technical solution in the prior art to achieve automated switching between these three modes. Furthermore, through an automatic SIM card recognition mechanism upon power-on, it can automatically adapt to satellite communication cards from different operators and automatically configure parameters such as frequency band, polarization, and protocol without requiring manual settings by the user. This significantly reduces the barrier to entry and operational complexity, and significantly improves the terminal's scenario adaptability and intelligence. Attached Figure Description

[0022] Figure 1 This is an overall flowchart of the communication mode switching method of the present invention; Figure 2 This is a flowchart illustrating the power-on initialization and automatic SIM card identification configuration in an embodiment of the present invention. Figure 3 This is a flowchart illustrating the low-power standby and antenna status monitoring process in an embodiment of the present invention. Figure 4This is a flowchart of the antenna deployment detection and detection time window startup process in an embodiment of the present invention; Figure 5 This is a flowchart illustrating the execution of PTT button status judgment and communication mode switching in an embodiment of the present invention. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention provides a communication mode switching method, such as... Figure 1 As shown, a multi-mode communication terminal integrating a foldable antenna, Hall sensor, PTT button, SIM card slot, and main control module includes the following steps: S1. The terminal is powered on and initialized. The main control module reads the SIM card information in the SIM card slot, determines the SIM card type, and configures the satellite communication parameters of the radio frequency front-end module accordingly. S2. The main control module enters standby mode and continuously monitors the antenna status level signal output by the Hall sensor. S3. When the Hall sensor detects that the folded antenna has been unfolded to a preset angle and outputs an antenna unfolding signal, the main control module triggers an interrupt and starts a detection time window of a preset duration. S4. Within the detection time window, the main control module detects the pressing status of the PTT button: if the PTT button is not pressed, it is determined that the satellite communication mode has been entered, and the satellite assistant is started to perform the satellite search and network access process; if the PTT button is pressed, it is determined that the intercom communication mode has been entered, and the intercom application is started to enter the intercom standby state. S5. When the Hall sensor detects that the folded antenna has returned to the folded position, the main control module exits the current communication mode and the terminal returns to the standby state.

[0025] Furthermore, in step S1, the SIM card type includes an L card corresponding to low-Earth orbit satellite communication and an S card corresponding to Tiantong satellite communication; if it is identified as an L card, the low-Earth orbit satellite communication frequency band and left-hand circular polarization parameters are configured; if it is identified as an S card, the Tiantong satellite communication frequency band and left-hand circular polarization parameters are configured.

[0026] Furthermore, in step S3, the duration of the preset detection time window ranges from 0.5 to 2 seconds; the time window is timed using a hardware timer and is triggered by an interrupt signal.

[0027] Furthermore, in step S3, the preset unfolding angle of the folded antenna is 180°~225°; the Hall sensor is a switch-type Hall sensor, which outputs a high-level antenna unfolding signal when the antenna is unfolded to the preset angle.

[0028] Furthermore, in step S4, when detecting the PTT button press state, button debounce processing is added: continuous sampling is performed at fixed intervals, and the state is determined to be valid when multiple sampling results are consistent, thus eliminating mechanical jitter interference.

[0029] Furthermore, step S4 also includes a press duration recognition step: a press duration of less than 0.5 seconds is determined as a short press and enters the standard intercom mode; a press duration of more than 1 second is determined as a long press and enters the emergency call mode.

[0030] Furthermore, in step S5, when the antenna returns to the folded position, the main control module sequentially shuts down the RF front-end power amplifier, closes the communication application, releases system resources, and finally restores the low-power standby state.

[0031] Furthermore, in step S3, a linear Hall sensor is used to detect the antenna deployment angle in real time, and multiple angle thresholds are set. Different angles correspond to different power consumption and operating modes of the terminal.

[0032] Furthermore, after completing the mode switching in step S4, a status feedback step is also included: the current communication mode and working status are fed back to the user through different colors of LED indicators, flashing frequencies, and voice prompts.

[0033] Furthermore, in step S4, the satellite communication mode satellite search and network access process specifically includes: powering on the radio frequency channel, pilot signal scanning, carrier tracking, channel demodulation, network registration, and standby readiness.

[0034] This application will be described below with reference to specific embodiments: Example 1: Basic Communication Mode Switching Method Based on Switch-Type Hall Effect This embodiment provides a communication mode switching method, which is implemented using a multi-mode communication terminal with a built-in switch-type Hall sensor, a single SIM card slot, a PTT button, and an ARM main control. This is the core basic implementation method of the present invention, and the specific execution steps are as follows: Step S1: As Figure 2As shown, during power-on initialization and automatic SIM card identification configuration, after the terminal is powered on, the main control module first performs hardware initialization, including clock configuration, GPIO port initialization, peripheral driver loading, and operating system startup. After completing system initialization, the main control module establishes communication with the SIM card slot through the ISO7816-3 protocol, with the communication baud rate set to 9600bps and the SIM card power supply voltage set to 3.3V.

[0035] The main control module sends instructions to the SIM card to read the card's ICCID (Integrated Circuit Card Identifier) ​​and IMSI (International Mobile Subscriber Identity) information, and determines the card type based on the number segment characteristics: if the number segment matches the low-Earth orbit satellite operator's identifier, it is determined to be an L card (low-Earth orbit satellite communication card); if the number segment matches the Tiantong satellite operator's identifier, it is determined to be an S card (Tiantong satellite communication card).

[0036] After identifying the card type, the main control module retrieves the corresponding standard parameter set for satellite communication from the system storage area and writes it into the configuration register of the RF front-end module. For L cards, the configuration parameters include: transmit frequency band 1668-1675MHz, receive frequency band 1518-1525MHz, polarization left-hand circular polarization, modulation method QPSK, and access protocol adapted to low-Earth orbit satellite systems; for S cards, the configuration parameters include: transmit frequency band 1980-2010MHz, receive frequency band 2170-2200MHz, polarization left-hand circular polarization, modulation method GMSK, and access protocol adapted to Tiantong satellite systems. After the parameters are configured, the RF front-end module enters a standby power-off state, while the register configuration remains powered on, preparing for subsequent rapid startup. Simultaneously, the terminal display shows the currently identified card type and a "Standby" status message.

[0037] Step S2: As Figure 3 As shown, after pre-configuring the parameters for low-power standby and antenna status monitoring, the terminal enters low-power standby mode. The main control module configures the CPU to operate at a low-frequency clock, turns off the display backlight and power supplies for unnecessary peripherals, and only keeps the Hall sensor detection, key scanning, and interrupt response modules active. The overall standby current is controlled in the milliampere range to ensure the terminal's battery life.

[0038] The main control module configures the GPIO pin corresponding to the Hall sensor as an external interrupt triggered by both rising and falling edges, with the interrupt priority set to high to ensure real-time response to antenna state changes. The Hall sensor uses a switching unipolar Hall device, operating at 3.3V, and its output level is compatible with CMOS standards. A neodymium iron boron permanent magnet is fixedly mounted at the hinge of the terminal folding antenna. When the antenna is in a 0° fully folded state, the linear distance between the magnet and the Hall sensor is approximately 3mm, and the magnetic field strength is higher than the Hall sensor's activation threshold, resulting in a stable low-level output from the Hall sensor. The main control module continuously monitors this level signal and maintains low-power standby when no level transition occurs.

[0039] Step S3: As Figure 4 As shown, antenna deployment detection and the detection window are activated. When the user holds the terminal and folds the antenna upwards from the 0° position, the magnet rotates synchronously with the antenna, and the distance between the magnet and the Hall sensor gradually increases, while the magnetic field strength gradually decreases. When the antenna deployment angle reaches 180°, the distance between the magnet and the Hall sensor exceeds 15mm, the magnetic field strength is lower than the Hall sensor's release threshold, and the Hall sensor's output level flips from low to high, generating a rising edge transition signal.

[0040] The rising edge signal directly triggers an external GPIO interrupt on the main control module. The main control module immediately exits low-power mode, restores the CPU frequency, and responds to the interrupt. The interrupt service routine first confirms that the level state is valid, then starts the internal general-purpose timer of the main control module, setting the timer duration to 1 second as the detection time window for the PTT button state. Simultaneously with the timer starting, the main control module begins periodic sampling of the GPIO pin corresponding to the PTT button, with a sampling interval of 10ms, recording the button's level state each time.

[0041] Step S4: As Figure 5 As shown, the PTT state combination judgment and mode switching are executed. Within a 1-second detection time window, the main control module performs anti-jitter processing and state judgment on the collected key level data: if three consecutive samples are low level, it is determined that the key is pressed; if three consecutive samples are high level, it is determined that the key is released. This eliminates the bouncing and shaking of mechanical keys and avoids misjudgment.

[0042] Based on the detection results, the terminal executes two different mode switching branches: Branch 1: PTT button not pressed, enters satellite communication mode If the PTT button remains high throughout the detection window and no valid press action is detected, the main control module determines that the user's intention to deploy the antenna is to enable satellite communication. The main control module then sends a power-on command to the RF front-end module to start the RF receiving channel; simultaneously, it automatically calls the satellite alignment assistant application and loads the pre-configured satellite frequency bands and protocol parameters from step S1.

[0043] After the satellite alignment assistant is activated, it executes the complete satellite search and network access process: First, it controls the radio frequency front-end to scan the satellite pilot signals in the corresponding frequency band. After signal acquisition, it enters the carrier tracking and code synchronization stage, demodulating the satellite broadcast channel to obtain system information. Then, it initiates a network registration request, completes signaling interaction with the satellite system, and enters satellite communication standby mode after successful registration. Throughout the entire satellite search and network access process, the display screen shows the alignment angle guidance, signal strength, and network access progress in real time. After successful network access, it displays a "Satellite connected" prompt, and the terminal can conduct normal satellite voice or data communication.

[0044] Branch 2: Press and hold the PTT button to enter walkie-talkie communication mode. If the PTT button is continuously pressed within the detection window, the main control module determines that the user's intention to extend the antenna is to enable intercom communication. The main control module then configures the RF front-end module to operate in the intercom frequency band, defaulting to the UHF 400~470MHz band, and simultaneously launches the digital / analog intercom application, supporting both DMR digital intercom and analog intercom modes.

[0045] After the intercom program starts, it completes channel initialization, configures the receive squelch threshold, and opens the receive channel to enter intercom standby mode. When the user releases the PTT button, the terminal remains in receive / listen mode. During subsequent use, the user can press the PTT button to activate the transmitter amplifier for voice transmission, and release it to resume reception, fully conforming to the operating habits of traditional walkie-talkies.

[0046] Step S5: Antenna folding and automatic mode exit. When the user finishes using the antenna, fold it down from the unfolded position to the 0° folded position. The magnet then approaches the Hall sensor again, and the magnetic field strength increases to above the action threshold. The Hall sensor output level flips from high level to low level, generating a falling edge transition signal.

[0047] This falling edge signal also triggers an external interrupt in the main control module, which then executes the mode exit and status rollback process: The first step is to shut down the power amplifier and transceiver channels of the RF front-end module, stop the transmission and reception of all RF signals, and avoid unnecessary power consumption. The second step is to send a command to close the currently running satellite assistant or intercom application and clear the memory cache and system resources used by the application. Third, close the communication status interface on the display screen and restore the standby display; Fourth, the main control module re-enters low-power standby mode, shuts down the power supply of unnecessary peripherals, reduces the CPU clock speed, restores the Hall sensor interrupt listening state, and completes the full state rollback loop.

[0048] This embodiment fully implements the intelligent switching logic of "antenna deployment + button combination", requiring no user operation of the menu throughout the process, and the physical operation directly corresponds to the mode switching.

[0049] Example 2: A hierarchical switching method with key press duration recognition Based on Example 1, this example further adds a PTT button press duration recognition function to realize hierarchical triggering in intercom mode and expand the application scenarios of the method. The specific optimizations are as follows: In the PTT button status detection phase of step S4, the main control module, in addition to determining whether the button is pressed, also records the start time and duration of the button press using a system timer. Within the detection window, when a valid button press is detected for the first time, the start timestamp is recorded; when the detection window ends, the cumulative press duration is calculated.

[0050] Ranked response based on press duration: Short press triggers standard intercom mode: If the pressing duration is less than 0.5 seconds, it is determined to be a short press operation, and the terminal enters the standard intercom standby mode, which is the regular intercom function in Example 1, supporting normal group intercom and individual call functions.

[0051] Long press to trigger emergency call mode: If the press lasts for more than 1 second, it is considered a long press operation, and the terminal directly triggers the emergency SOS call mode. In this mode, the terminal automatically calls the preset emergency contact number and initiates an emergency call through the currently available communication link; at the same time, it automatically retrieves the location information from the terminal's positioning module and sends it to the emergency contact and the back-end command platform in the form of a short message or SMS; simultaneously, the radio frequency front-end automatically switches to the maximum transmission power to improve the probability of emergency call connection and communication distance.

[0052] This embodiment expands upon the dimension of press duration, enabling the multiplexing of regular intercom and emergency call triggering without adding additional buttons. This further enriches the functional dimensions of single-button operation, making it particularly suitable for high-risk scenarios such as emergency rescue and outdoor adventure. In case of an emergency, users only need to unfold the antenna and press and hold the PTT button to call for help with one click. The operation is extremely convenient and greatly enhances the terminal's emergency support capabilities.

[0053] Example 3: Multi-level Angle Linkage Switching Method Based on Linear Hall Effect Based on Embodiment 1, this embodiment replaces the switch-type Hall sensor with a linear Hall sensor to achieve continuous detection of the antenna deployment angle and multi-level operating mode linkage, further optimizing the power consumption control and performance matching of the terminal. The specific implementation method is as follows: The output voltage of a linear Hall sensor is linearly related to the strength of the surrounding magnetic field, and the magnetic field strength corresponds one-to-one with the distance from the magnet. Therefore, the output voltage can indirectly reflect the real-time deployment angle of the antenna. The main control module has a built-in 12-bit precision AD converter that samples the output voltage of the linear Hall sensor at a period of 50ms. Using a pre-calibrated voltage-angle conversion formula, the real-time deployment angle of the antenna is calculated, with an angle detection accuracy of ±5°.

[0054] The main control module presets three angle thresholds, corresponding to three different working states of the terminal, to achieve smooth linkage between angle and state: 0°~90°: Deep low-power standby. When the antenna deployment angle is less than 90°, the terminal is in deep low-power standby mode. In this mode, the main control CPU operates at the lowest clock frequency, the display screen is turned off, all power to the RF front end is turned off, and most peripherals are turned off, retaining only Hall sampling and key scanning functions. The overall standby current is reduced to the minimum, maximizing the battery life.

[0055] 90°~180°: Standard Ready Mode. When the antenna deployment angle reaches or exceeds the 90° threshold, the terminal automatically wakes up and enters the standard ready mode. In this mode, the main control unit resumes its main frequency, the display screen lights up, the RF front-end module powers on and completes initialization, the register configuration is loaded, and it is in a ready-to-wait state, but no specific communication application is started yet; while the user continues to deploy the antenna, the terminal has completed warm-up, enabling instantaneous mode startup.

[0056] 180°~225°: Standard operating mode. When the antenna is extended to more than 180°, the detection window and combined judgment logic in Embodiment 1 are triggered, and the corresponding communication operating mode is entered. This is the standard operating state.

[0057] Above 225°: High-gain enhancement mode. When the antenna is fully extended to its maximum angle of 225°, the terminal automatically enters high-gain enhancement mode. In this mode, the transmit power of the RF front-end is increased by 3dB, the low-noise amplifier in the receiving link is activated in high-gain mode, the antenna radiation efficiency is optimized, and the communication distance and signal anti-interference capability are significantly improved. It is suitable for remote areas with weak signals and complex environments with severe obstruction, ensuring communication reliability in extreme scenarios.

[0058] This embodiment achieves a dynamic balance between power consumption and performance through continuous angle detection and multi-level state linkage: low power consumption and long battery life at small angles, and high performance and strong guarantee at large angles. This not only improves the battery life of the terminal, but also optimizes the communication performance in different scenarios, further enhancing the refinement and practicality of the technical solution.

[0059] Example 4: Complete Switching Method with Multimodal Feedback Based on the above embodiments, this embodiment adds a complete multimodal status feedback mechanism, allowing users to intuitively perceive the terminal's working mode and status without viewing the display screen, further improving operational convenience. Specific feedback methods include: 1. LED light feedback: The terminal has an RGB tri-color LED indicator at the base of the antenna, which is directly controlled by the main control module. Different colors and flashing frequencies correspond to different working states. Standby mode: Indicator lights are off to reduce power consumption; Intercom standby mode: Solid green light indicates that the intercom is ready; During intercom transmission: Green light flashes rapidly (2 times / second) to indicate transmission status; Satellite search in progress: slow blue flashing (1 time / second), indicating that network access is in progress; Satellite network access successful: Solid blue light indicates satellite communication is ready; Emergency call mode: Red flashes rapidly (3 times / second) to indicate an emergency. Fault / Low Battery: Red flashing slowly (0.5 times / second), indicating an abnormal state.

[0060] 2. Voice broadcast feedback: The terminal has a built-in speaker and voice prompt sound library, playing corresponding voice prompts at key points during mode switching: Enter intercom mode: Play "Intercom mode has been entered"; Start satellite search: Play "Searching for satellites, please keep your antenna stable"; Satellite network access successful: Plays "Satellite connected"; Entering Emergency Call: Plays "Initiating Emergency Call"; Antenna folding exit: Plays "Exited, returning to standby".

[0061] The volume of the voice prompts can be adjusted using the side buttons, or it can be set to silent mode to suit the needs of different usage scenarios.

[0062] 3. Screen display feedback: The terminal display screen synchronously displays detailed status information, including current communication mode, signal strength, battery level, positioning status, satellite acquisition progress, etc., providing users with complete status information; it also supports touch operation, allowing for advanced parameter settings and function configuration.

[0063] This embodiment constructs a complete user status perception system through a triple feedback mechanism of light, voice, and screen. Especially in scenarios where it is inconvenient to view the screen, such as strong light, weak light, or operation with both hands, users can quickly confirm the terminal status through light and voice, and the operation experience and ease of use are comprehensively improved.

[0064] The above four embodiments, from basic functions to extended optimizations, fully cover various implementations of the present invention. Those skilled in the art can combine, replace, and modify the technical features in the above embodiments according to actual product needs, and all of these modifications should be covered within the protection scope of the present invention.

Claims

1. A communication mode switching method applied to a multi-mode communication terminal integrating a foldable antenna, a Hall sensor, a PTT button, a SIM card slot and a master control module, characterized in that Includes the following steps: S1. The terminal is powered on and initialized. The main control module reads the SIM card information in the SIM card slot, determines the SIM card type, and configures the satellite communication parameters of the radio frequency front-end module accordingly. S2. The main control module enters standby mode and continuously monitors the antenna status level signal output by the Hall sensor. S3. When the Hall sensor detects that the folded antenna has been unfolded to a preset angle and outputs an antenna unfolding signal, the main control module triggers an interrupt and starts a detection time window of a preset duration. S4. Within the detection time window, the main control module detects the pressing status of the PTT button: if the PTT button is not pressed, it is determined that the satellite communication mode has been entered, and the satellite assistant is started to perform the satellite search and network access process; if the PTT button is pressed, it is determined that the intercom communication mode has been entered, and the intercom application is started to enter the intercom standby state. S5. When the Hall sensor detects that the folded antenna has returned to the folded position, the main control module exits the current communication mode and the terminal returns to the standby state.

2. The communication mode switching method according to claim 1, characterized by, In step S1, the SIM card type includes an L card for low-Earth orbit satellite communication and an S card for Tiantong satellite communication; if it is identified as an L card, configure the low-Earth orbit satellite communication frequency band and left-hand circular polarization parameters; if it is identified as an S card, configure the Tiantong satellite communication frequency band and left-hand circular polarization parameters.

3. The communication mode switching method of claim 1, wherein, In step S3, the duration of the preset detection time window is in the range of 0.5 to 2 seconds. The time window is timed by a hardware timer and is triggered by an interrupt signal.

4. The communication mode switching method of claim 1, wherein, In step S3, the preset unfolding angle of the folded antenna is 180°~225°; the Hall sensor is a switch-type Hall sensor, which outputs a high-level antenna unfolding signal when the antenna is unfolded to the preset angle.

5. The communication mode switching method of claim 1, wherein, In step S4, when detecting the PTT button press state, button debouncing is added: continuous sampling is performed at fixed intervals, and the state is determined to be valid when multiple sampling results are consistent, thus eliminating mechanical jitter interference.

6. The communication mode switching method of claim 1, wherein, Step S4 also includes a press duration recognition step: a press duration of less than 0.5 seconds is determined as a short press and enters the standard intercom mode; a press duration of more than 1 second is determined as a long press and enters the emergency call mode.

7. The communication mode switching method according to claim 1 or 6, characterized by, In step S5, when the antenna returns to the folded position, the main control module sequentially shuts down the RF front-end power amplifier, closes the communication application, releases system resources, and finally restores the low-power standby state.

8. The communication mode switching method of claim 1, wherein, In step S3, a linear Hall sensor is used to detect the antenna deployment angle in real time, and multiple angle thresholds are set. Different angles correspond to different power consumption and working modes of the terminal.

9. The communication mode switching method of claim 1, wherein, After completing the mode switching in step S4, a status feedback step is also included: the current communication mode and working status are fed back to the user through different colors of LED indicators, flashing frequency, and voice prompts.

10. The communication mode switching method of claim 1, wherein, In step S4, the satellite communication mode satellite search and network access process specifically includes: powering on the radio frequency channel, pilot signal scanning, carrier tracking, channel demodulation, network registration, and standby readiness.

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