Abstract:To solve the problems of artificial weighing, which is time-consuming and laborious, easy to cause animal stress, and electronic instruments are easy to destroy in the process of poultry breeding, a set of wireless dynamic adaptive weighing systems is designed in this paper. The system combines empirical mode decomposition and robust Kalman filter to improve the algorithm and proposes an innovative queue-based automatic peeling algorithm to solve the weighing zero offset problem caused by feces and feed accumulation. Through the practical application and monitoring verification in broiler farms, the results show that the wireless dynamic adaptive weighing system designed in this paper can obtain animal weight quickly and accurately, and has good adaptability, stability, and robustness.

Abstract:The occurrence of waterlogging disasters can seriously affect the safety of peoples lives and property around rivers, and it is important to keep track of the water level changes in rivers in a timely and accurate manner. In response to the shortcomings of the current traditional water level measurement and monitoring methods in terms of timeliness and safety, a water level remote monitoring system based on a pulsed laser and a cloud platform is designed. The measurement device is based on an STM32 microcontroller, which emits a pulsed laser to a floating board in a measurement barrel, detects the distance from the device to the floating board on the water surface, and finally calculates the depth of the water level of the river to be monitored. Laboratory simulation results show that the relative error is less than 1.7% and the coefficient of variation is less than 1.2% when the water level depth is between 200mm and 800mm when the measuring device is fixed at a height of 1m. The wireless transmission module enables real-time uploading of water level data, and the cloud platform can accurately display the water level and measurement time, indicating that the remote water level monitoring system is feasible and can achieve real-time remote monitoring of river water level, and has certain application value.

Abstract:The traditional wireless monitoring system based on Zig Bee has many problems, such as limited data transmission distance and high power consumption. A low-power medical monitoring system based on Lora technology is designed. According to the different functions, the whole monitoring system can be divided into three parts, each part realizes data interaction through Lora wireless network. The core device of the detection end is the infrared photoelectric sensor, which sends the acquired dropping speed and liquid medicine margin to the hand-held end through Lora wireless network on the one hand, and to the patient through voice broadcast and LCD display on the other hand, and the detection end is also responsible for receiving the patient information sent from the hand-held end and the rear end. The backstage end is responsible for monitoring patients and nurses in an all-round way. The experimental results show that the medical drip monitoring system designed in this paper has strong anti-interference ability, can realize data long-distance transmission, not only low power consumption, but also easy to network, and has a wide range of application prospects.

Abstract:Traditional ultrasound Doppler fetal monitor uses analog demodulation to analyze fetal heart rate. Because the demodulated signal in this mode is a single channel signal, vector analysis can not be carried out. Therefore, in the practical application process, there is repeated recognition of positive and negative movement of mitral valve, resulting in the phenomenon of heart rate doubling. In this research, we designed and implemented a wireless ultrasound Doppler fetal monitoring system based on digital demodulation mode. The system uses the time domain windowing method to demodulate the ultrasonic echo signal, and analyzes the heart rate according to the vector velocity curve. The system can effectively avoid the phenomenon of heart rate doubling. At the same time, the system uses the data wireless transmission scheme between the host and probes, which greatly facilitates the use of operators. According to the results of standard fetal heart phantom test, the system can effectively solve the defect of heart rate doubling existing in traditional equipment, and realize stable, reliable and convenient fetal monitoring.

Abstract:In order to recover the projectile borne recorder, it is necessary to accurately find the position of the projectile impact point, and ensure that it can still accurately find the location of the impact point when the impact point is in the shielding environment and poor wireless transmission environment. A multi positioning beacon machine is designed. Firstly, the target position is reduced by using the final received GPS positioning signal, and then the projectile impact point is found by detecting the target signal strength. This design is composed of GPS module of transmitter, decoding module controlled by FPGA, Lora remote wireless module, data processing and display module of receiver, directional antenna, etc. The experiment is a fixed-point test experiment, which is conducted in three different locations of the school. The test results are as follows: the positioning parameters of GPS signal are: 112.44571 e, 38.01395 n. the signal strength of the strongest direction at the three observation points are - 49dbm, - 58.5dbm and - 65dbm respectively. Through the final received positioning information and the signal strength information received in the later stage, the impact position of the projectile can be found effectively, which proves the feasibility of the search device and improves the effective search means for the recovery of the missile borne recorder.

Abstract:To address the high-overload data problem in the bore during the development and testing of small rockets, a wireless missile-borne acquisition system based on MRAM is proposed. The hardware part of the system uses wireless transmission to achieve real-time data reception, uses the high reliability of MRAM to store data, and uses data readback to improve the reliability of the system; the software part uses continuous threshold trigger design to reduce false triggers Probability, using programmable digital conditioning modules to provide better linearity, accuracy and temperature stability for data acquisition. The test results show that the system can collect and store overload data at a sampling rate of 100 kHz under severe conditions in the bore. It can wirelessly receive data within 900 m, and the transmit current is 430 mA, which not only has the advantage of high reliability, It also has the characteristics of miniaturization and low power consumption.

Abstract:Aiming at the defects existing in the current wired monitoring system for snubbing operation, including complicated wiring, poor anti-interference and difficult maintenance, in this paper, we design a monitoring system of snubbing operation based on ZigBee technology. The system comprises a data base station and several multi-parameter terminal collection nodes, which can safely and effectively collect various data during the operation of snubbing operation equipment under wireless conditions. The numerical simulation results show that the packet loss rate is 0 when the communication distance is less than 150 m, and the packet loss rate is 0.4% when the communication distance reaches 200 m, which shows the system can fully meet the requirements of 50 m transmission distance in practical applications. The practical application results demonstrate that the system overcomes the constraints of traditional physical wiring, facilitates the efficient collection of data information, realizes wireless monitoring of snubbing operation and has wide application prospects in the snubbing operation system.

Abstract:In view of the complicated and variable environment of seismic exploration field, using traditional wired or single wireless technology to transmit data has the problems of low reliability, high cost and low efficiency. By analyzing the existing wireless technology, a kind of hybrid wireless data transmission scheme based on 4G cellular network and WiFi network was proposed. The solution prevents and relieves congestion through TCP Vegas and queue management. The test results show that the proposed hybrid wireless data transmission scheme operates reliably and steadily in the seismic exploration system, has high speed of data transmission. It can absorb large amounts of data flow in a short time and prevent congestion, provides technical support for the field seismic exploration process and has certain application prospect.

Abstract:For the automatic discrimination of checking the quality of physical index of college students, a design scheme of intelligent physical measuring instrument is proposed. Firstly, using STM32F103 microcontroller as the main controller, campus card numbers are displayed on the TFTLCD screen after swiping card by radio frequency module. Secondly, weight, height and vital capacity are measured by weighing sensors, ultrasonic sensors and vital capacity sensors. Thirdly, the physical data in the form of text messages is sent to the designated mobile phone by GSM module. In addition, the function of data wireless transmission can be achieved by using bluetooth module. Manmachine interaction is realized through the TFTLCD screen and bluetooth mobile phone client. Finally, the experiment demonstrates that the system runs extremely smoothly, realizes the diversitied function and to further strengthen that more attention should be paid to physical health of college students.

Abstract:Because of the harsh environment of the scene of the accidents, the rescue workers are the only persons who are able to enter it. So the commanders outside are difficult to make the rescue plan timely. If the rescue workers use a wireless image detection system to transmit live video of the scene, the commanders could see the situation and quickly make the appropriate rescue plan. It not only effectively saves the rescue time but also greatly improves rescue capabilities. The system can transmit video signals over wireless network. Both transmitting and receiving devices have four channels to choose. Both receiving and display system are handheld or vehiclemounted, and they can be installed in the command car. The transmitting device is batterypowered. There are also optional lighting and temperature, humidity or smoke sensors, particularly, can be used for detection in smoke and dark environments.