The Design Of UHF Digital Radiosonde

For a long time, we have been used artificial balloon to carry out high-altitude comprehensive detection, correct for the flight trajectory of the object. Domestic similar equipment, there is a high bit error rate, and only one balloon can be detected In order to solve the above problems, this instrument adoptes Code Division Multiple Access(CDMA) and GPS(Global Positioning System) technology, to reduce the bit error rate and to observe four radiosondes.The program is divided into air-transmitter, receiver and the ground PC software. Transmitter will be responsible for the location and sensor (PTU) measuring meteorological parameters, with the direct sequence spread spectrum, or FSK,MSK modulation which send data to the ground per second.The ground receiver demodulates the data received, and all arguments after the demodulation through the serial port or CAN bus, send to PC. Software is responsible for calculating the location of sounding instrument. The PTU and the exact location of the dates are shared memory, to third-party data sharing.After demodulation, receive dates will be sent to PC by CAN bus or the serial port. Serial is a universal serial port and can be used easily. Differential voltage can achieve the long-range multi-node data transmission, to field operations.PC software includes hardware module parameters, the real-time data display and preserve module, calculation module, data playback module, the shared memory modules, hardware self-test module, the bit error rate test module.After Shantou in Guangdong, 25 km from the test showed that the radiosonde to achieve the goals set. Dates from radiosonde can be stable transmission, displayed correctly, nicey positioning results.