A wireless transceiver system for underwater vital sign sensing

Abstract

The present invention discloses an underwater vital sign sensing wireless transceiver system, including an underwater vital sign wireless transmitting module and a wireless receiving module; the underwater vital sign wireless transmitting module includes a sensor module, a first MCU, a wireless transmitting chip, a power amplifier module and a transmitting antenna connected in sequence; the wireless receiving module includes a receiving antenna, a bandpass filter, a low noise amplifier, a wireless receiving chip and a second MCU connected in sequence. The underwater vital sign sensing wireless transmitting module uses a wireless transmitting circuit to transmit the collected vital signs and motion data to a receiving module on shore, which is processed by the MCU and then transmitted to a computer through a communication interface circuit, thereby improving the operation speed. The power amplifier module enables the wireless signal to be transmitted over long distances underwater, and the receiving module on shore can obtain a stable and reliable signal. And by optimizing the circuit structure and integrated design, the size of the device is reduced, making it easier to install and carry.

Description

Technical Field

[0001] The invention relates to the technical field of wireless sensor technology for human vital signs, and in particular to the technical field of remote wireless sensor technology for underwater human vital signs. Background Art

[0002] With the increase in indoor swimming pools, the number of swimmers is increasing. How to ensure the personal safety of swimmers is a major issue. The traditional way is to deploy observers on the shore to provide manpower protection. However, when there are many people in the swimming pool, there are often omissions, resulting in serious consequences.

[0003] In addition, when workers are working outdoors underwater, if they are not equipped with real-time vital signs monitoring equipment, the real-time physiological state of the underwater workers cannot be monitored, and accidents are prone to occur during long-term work.

[0004] Even if vital signs monitoring equipment is equipped, it is wired, such as cables, optical cables, etc., which greatly affects the staff's operating scope and work efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide an underwater vital sign sensing wireless transceiver system, which can monitor the vital signs of underwater personnel in real time, including body temperature, heart rate, and movement trajectory. It can solve the current safety protection problem of indoor swimming pools, provide equipment protection for the personal safety of outdoor underwater workers, and improve the outdoor underwater operation range and work efficiency. This underwater vital sign sensing wireless transceiver system is small in size, low in power consumption, long in working time, and easy to carry and install.

[0006] A wireless transceiver system for underwater vital sign sensing includes an underwater vital sign wireless transmitting module and a wireless receiving module; the underwater vital sign wireless transmitting module includes a sensor module, a first MCU, a wireless transmitting chip, a power amplification module and a transmitting antenna connected in sequence, and also includes a battery power module for supplying power to each module; the wireless receiving module includes a receiving antenna, a bandpass filter, a low-noise amplifier, a wireless receiving chip and a second MCU connected in sequence, and also includes a DC power module for supplying power to each module.

[0007] Preferably, the sensor module includes a heart rate sensor, a body temperature sensor, an accelerometer and a gyroscope. The data collected by the heart rate sensor, the body temperature sensor, the accelerometer and the gyroscope are output to the first MCU. The first MCU processes the data and controls the switching state of the wireless transmitting chip. The wireless transmitting chip modulates the processed data and up-converts it into a radio frequency signal. The radio frequency signal enters the power amplifier module for signal amplification.

[0008] Preferably, the power amplifier module includes a driving amplifier and a final amplifier. The driving amplifier uses a GaAs HBT process Gainblock to preliminarily amplify the RF signal to 23dBm; the final amplifier uses a low-voltage LDMOS process power amplifier to amplify the signal to 40dBm; the amplified signal enters the transmitting antenna.

[0009] Preferably, the transmitting antenna adopts an omnidirectional radiating antenna with a spiral coil structure and a gain of 3dBi; the receiving antenna adopts a fiberglass omnidirectional antenna with a gain of 6dBi, and the signal is coupled from the receiving antenna and enters a bandpass filter.

[0010] Preferably, the bandpass filter performs out-of-band filtering on the radio frequency signal, and after filtering, the signal enters a low-noise amplifier; the low-noise amplifier is powered by 3.3V, and after the signal is amplified by the low-noise amplifier, the signal is output to a wireless receiving chip for demodulation; the wireless receiving chip demodulates the radio frequency signal, restores the data, and enters the second MCU for processing; the second MCU performs data processing to obtain data collected by the sensor, and finally transmits it to the computer.

[0011] Preferably, the first MCU of the transmitting module controls the periodic working state of the wireless transmitting chip, transmits data once every 1 second, and each transmission lasts 1 ms.

[0012] Preferably, the wireless transmitting chip of the transmitting module performs FSK modulation on the data, and the carrier frequency is 170 MHz.

[0013] Preferably, the driver amplifier and final amplifier of the transmitting module are input matched and output matched, and are both matched to 50ohm, so that the input standing wave of the driver amplifier and the final amplifier is less than 1.5; the output matching of the final amplifier adopts power matching method, so that the output power of the final amplifier reaches the optimal state.

[0014] Preferably, the bandpass filter of the receiving module is a crystal filter.

[0015] Preferably, the low noise amplifier of the receiving module adopts SiGe technology, and the input impedance of the low noise amplifier is matched to the lowest noise area in the simith chart, thereby improving the receiving sensitivity of the wireless receiving module.

[0016] The advantages of the present invention are: an underwater vital sign sensing wireless transmitting module is installed on the body of a swimmer or underwater worker, including a body temperature sensor, a heart rate sensor, an accelerometer and a gyroscope, and the collected vital signs and motion data are transmitted to a receiving module on the shore by a wireless transmitting circuit, and then transmitted to a computer through a communication interface circuit after being processed by an MCU. A large amount of data calculation work is handed over to the computer, which not only improves the calculation speed, but also saves the battery energy of the underwater transmitting module. The computer displays the results in real time to monitor various physiological indicators and motion trajectories of the swimmer or underwater worker, so as to intervene and treat in time when signs of accidents occur. The power amplifier module enables the wireless signal to be transmitted over long distances underwater, and the receiving module on the shore can obtain a stable and reliable signal. And by optimizing the circuit structure and integrated design, the size of the device is reduced, making it easier to install and carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. The accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 The present invention is a schematic diagram of the structure of a wireless transceiver system for underwater vital sign sensing according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present invention and are not limited to the scope of the present invention. The implementation conditions adopted in the examples can be further adjusted according to environmental conditions, and the unspecified implementation conditions are usually the conditions in conventional experiments.

[0020] See also Figure 1 An underwater vital sign sensing wireless transceiver system is shown, comprising an underwater vital sign wireless transmitting module and a wireless receiving module.

[0021] The underwater vital sign wireless transmission module comprises a sensor module, a first MCU, a wireless transmission chip, a power amplifier module, a battery power module and a transmitting antenna which are connected in sequence.

[0022] The sensor module includes a heart rate sensor, a body temperature sensor, an accelerometer and a gyroscope. The data collected by the heart rate sensor, the body temperature sensor, the accelerometer and the gyroscope are output to the first MCU, and the first MCU performs data processing.

[0023] The first MCU has two main functions: the first is to process the data collected by the sensor module for coding and modulation; the second is to control the switching state of the wireless transmitting chip.

[0024] The wireless transmitting chip modulates the processed data and up-converts the frequency into a radio frequency signal, and the radio frequency signal enters the power amplifier module for signal amplification.

[0025] The power amplifier module includes a driver amplifier and a final amplifier. The driver amplifier uses a GaAsHBT process Gainblock, 3.3V power supply, to preliminarily amplify the RF signal to 23dBm; the final amplifier uses a low-voltage LDMOS process power amplifier, which can work stably in the range of 7.2V-8.4V and amplify the signal to 40dBm. The amplified signal enters the transmitting antenna.

[0026] The transmitting antenna adopts a spiral coil structure, which reduces the size of the antenna, is conducive to equipment integration, and is easy to carry; the transmitting antenna is an omnidirectional radiation antenna, which reduces the influence of underwater posture, has a gain of 3dBi, and can transmit signals out of the water in various postures.

[0027] The battery power module includes a battery and an LDO. The battery is a lithium battery with an output voltage of V1: 7.2V-8.4V. The LDO is a voltage conversion chip that converts the 7.2V-8.4V output of the lithium battery into V2: 3.3V. V1 is used to power the final amplifier; V2 is used to power the sensor module, MCU, wireless transmitter chip, and drive amplifier.

[0028] The wireless receiving module includes a receiving antenna, a bandpass filter, a low noise amplifier, a wireless receiving chip, a second MCU, and a DC power supply module which are connected in sequence.

[0029] The receiving antenna uses a fiberglass antenna. Since the wireless receiving module is placed on the water surface, a high-quality fiberglass omnidirectional antenna with a gain of 6dBi can be used to improve the received signal strength. After the signal is coupled from the antenna, it enters the bandpass filter.

[0030] The bandpass filter performs out-of-band filtering on the radio frequency signal, reduces the interference caused by out-of-band stray signals, and improves the receiving sensitivity of the wireless receiving module. After filtering, the signal enters the low noise amplifier.

[0031] The low noise amplifier is powered by 3.3V. After the signal is amplified by the low noise amplifier, the receiving sensitivity of the wireless receiving module is improved. After amplification by the low noise amplifier, the signal is output to the wireless receiving chip for demodulation.

[0032] The wireless receiving chip demodulates the radio frequency signal, restores the data, and enters the second MCU for processing.

[0033] The second MCU performs data processing to obtain the data collected by the sensor and finally transmits it to the computer.

[0034] The DC power supply module has a DC input voltage of V3: 12V, and a DC-DC chip is used to convert 12V to V4: 3.3V. V4 is used to power the low noise amplifier, wireless receiving chip and MCU.

[0035] Preferably, in the above embodiment, the MCU of the transmitting module controls the periodic working state of the wireless transmitting chip, transmits data once every 1 second, and each transmission lasts 1 ms to reduce the power consumption of the whole machine and enable the battery to provide power for a long time.

[0036] Preferably, in the above embodiment, the accelerometer and gyroscope of the transmitting module can collect the motion posture data of the underwater person, so that the motion situation of the underwater person can be more intuitively understood at the receiving end.

[0037] Preferably, in the above embodiment, the wireless transmitting chip of the transmitting module performs FSK modulation on the data and up-converts the data into a radio frequency signal, and the carrier frequency is 170 MHz. The low frequency of 170 MHz is conducive to long-distance transmission of radio underwater.

[0038] Preferably, the driver amplifier and the final amplifier of the transmitting module are input matched and output matched to 50 ohms, so that the input standing wave of the driver amplifier and the final amplifier is less than 1.5; the output matching of the final amplifier adopts power matching method, so that the output power of the final amplifier reaches the optimal state.

[0039] Preferably, in the above embodiment, the bandpass filter of the receiving module adopts a crystal filter, which has low insertion loss, excellent out-of-band suppression, and high quality factor, greatly reduces the interference caused by out-of-band stray signals, and improves the receiving sensitivity of the wireless receiving module.

[0040] Preferably, in the above embodiment, the low noise amplifier of the receiving module adopts SiGe technology, has low noise and high gain, and the input impedance of the low noise amplifier needs to be matched to the lowest noise area in the simith chart to improve the receiving sensitivity of the wireless receiving module.

[0041] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An underwater vital sign sensing wireless transceiver system, characterized in that: It includes an underwater vital sign wireless transmitting module and a wireless receiving module; The underwater vital sign wireless transmission module includes a sensor module, a first MCU, a wireless transmission chip, a power amplifier module and a transmission antenna connected in sequence, and also includes a battery power module for powering each module; The wireless receiving module includes a receiving antenna, a bandpass filter, a low noise amplifier, a wireless receiving chip and a second MCU connected in sequence, and also includes a DC power supply module for powering each module; The power amplifier module includes a driver amplifier and a final amplifier. The driver amplifier uses a GaAs HBT process Gainblock to preliminarily amplify the RF signal to 23dBm. The final amplifier uses a low-voltage LDMOS process power amplifier to amplify the signal to 40dBm. The amplified signal enters the transmitting antenna. The transmitting antenna adopts an omnidirectional radiating antenna with a spiral coil structure and a gain of 3dBi; the receiving antenna adopts a fiberglass omnidirectional antenna with a gain of 6dBi. After the signal is coupled from the receiving antenna, it enters the bandpass filter; The bandpass filter performs out-of-band filtering on the radio frequency signal, and after filtering, the signal enters the low noise amplifier; the low noise amplifier is powered by 3.3V, and after the signal is amplified by the low noise amplifier, the signal is output to the wireless receiving chip for demodulation; the wireless receiving chip demodulates the radio frequency signal, restores the data, and enters the second MCU for processing; The second MCU performs data processing to obtain the data collected by the sensor and finally transmits it to the computer.

2. The underwater vital sign sensing wireless transceiver system according to claim 1, characterized in that: The sensor module includes a heart rate sensor, a body temperature sensor, an accelerometer and a gyroscope. The data collected by the heart rate sensor, the body temperature sensor, the accelerometer and the gyroscope are output to the first MCU. The first MCU processes the data and controls the switching state of the wireless transmitting chip. The wireless transmitting chip modulates the processed data and up-converts it into a radio frequency signal. The radio frequency signal enters the power amplifier module for signal amplification.

3. The underwater vital sign sensing wireless transceiver system according to claim 2, characterized in that: The first MCU of the transmitting module controls the periodic working state of the wireless transmitting chip, transmits data once every 1 second, and each transmission lasts 1ms.

4. The underwater vital sign sensing wireless transceiver system according to claim 2, characterized in that: The wireless transmitting chip of the transmitting module performs FSK modulation on the data, and the carrier frequency is 170 MHz.

5. The underwater vital sign sensing wireless transceiver system according to claim 2, characterized in that: The driving amplifier and the final amplifier of the transmitting module are input matched and output matched, and are both matched to 50ohm, so that the input standing wave of the driving amplifier and the final amplifier is less than 1.5; the output matching of the final amplifier adopts power matching method, so that the output power of the final amplifier reaches the optimal state.

6. The underwater vital sign sensing wireless transceiver system according to claim 2, characterized in that: The bandpass filter of the receiving module adopts a crystal filter.

7. The underwater vital sign sensing wireless transceiver system according to claim 2, characterized in that: The low noise amplifier of the receiving module adopts SiGe technology, and the input impedance of the low noise amplifier is matched to the lowest noise area in the simith chart, thereby improving the receiving sensitivity of the wireless receiving module.

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