The Design Of Beidou Radiosonde Based On High-accuracy Temperature Sensor

The radiosonde which carried by helium balloons or hydrogen balloons enters the atmosphere at a rising speed of 5-6 m/s.The.radiosonde carries temperature sensor,air pressure sensor,humidity sensor,GPS positioning module,and wireless communication module to measure the atmospheric physical parameters at different heights,such as temperature,pressure,and humidity,and transmit the measured data to the ground workstation through a built-in wireless transmission unit for providing basic atmospheric state information for weather forecast,climate analysis,meteorological research and other fields.GPS global navigation satellite positioning system is under the control of the U.S.military.If China's high-altitude meteorological detection business was established in the United States' GPS positioning system,national security will be a cause for concern.The sounding temperature sensor is susceptible to the solar radiation when measuring temperature,and the solar radiation error sometimes exceeds 3 ?,which seriously restricts the accuracy of sounding temperature measurement.The radiosonde is proposed and designed in this paper based on the domestic Beidou chip,which can not only break the monopoly position of GPS in this field and ensure national security,but also save huge expenditure required for the introduction of such equipment.Aiming at the problem of solar radiation affecting the measurement accuracy of sounding temperature sensors,a high-precision temperature measurement circuit based on 24-bit ?-A ADC was designed.A solar radiation simulation experiment platform was set up and the experiments were conducted in a low pressure temperature chamber.A method of fitting the solar radiation error correction equation by using the Levenberg-Marquardt(L-M)algorithm is proposed.The experimental results show that the sounding temperature sensor and its algorithm reduce the root mean square error from 0.88 ? to 0.28 ?,which improves the measurement accuracy of the sounding temperature sensor and has certain application potential in the field of high-altitude meteorological detection.