High Altitude Balloon by Julián Fernández RF recording 2019-05-19

This is a recording of an Amateur high altitude balloon released by Julián Fernández EA4HCD on 2019-05-19. The balloon carried a LoRa and RTTY transmitter on 434.5MHz and a LoRa transmitter on 868MHz. The balloon was released near Madrid (Spain) and reached and altitude of 24km and distance of 180km. This recording was done from shortly after release until 15 minutes before burst. Amateur radio callsign: EA4GPZ Station location: 40.620697,-3.6936182, in Tres Cantos, near Madrid. Antenna: 7 element 435MHz yagi from Arrow Antennas, vertical polarization, roughly aimed to the balloon location, 3m above ground level. Receiver: FUNcube Dongle Pro+, LNA and mixer gain enabled. Frequency: 434.5MHz at the start of the recording, changed later to 434.502MHz without interruption of the recording. Sample rate: 192ksps. Recording start: 2019-05-19 15:37:19 UTC Format: Linrad raw format: 41 byte header followed by little-endian int16 IQ data.本数据集为Julián Fernández EA4HCD于2019年5月19日释放的业余高空气球（Amateur high altitude balloon）的接收录音。该气球搭载了工作于434.5MHz的LoRa与无线电传（RTTY，Radioteletype）发射机，以及工作于868MHz的LoRa发射机。气球于西班牙马德里附近释放，最大飞行高度达24千米，总飞行距离达180千米。本次录音时段为气球释放后即刻至其爆裂前15分钟。 接收站相关参数如下： 业余无线电呼号：EA4GPZ 接收站位置：位于马德里近郊特雷斯坎托斯（Tres Cantos），地理坐标为40.620697,-3.6936182 接收天线：采用Arrow Antennas出品的7单元435MHz八木天线（Yagi antenna），采用垂直极化方式，大致对准气球飞行区域，架设高度距地面3米 接收机：使用FUNcube Dongle Pro+，启用低噪声放大器（LNA，Low Noise Amplifier）与混频器增益 接收频率：录音初始阶段为434.5MHz，后续调整为434.502MHz，录制过程未出现中断 采样率：192千样本每秒（ksps） 录音开始时间：协调世界时（UTC）2019年5月19日15时37分19秒 录音格式：采用Linrad原始格式，即文件首41字节为文件头，后续数据为小端序（little-endian）int16格式的同相-正交（IQ，In-phase and Quadrature）数据。