BY70-2 UHF telemetry beacon IQ recording 2020-07-12

This is a recording the UHF beacon of the satellite BY70-02 (also known as BY02). The satellite transmits a beacon every 35 seconds at a frequency of 436.200 MHz. The recording was made on 2020-07-12 11:39:50 UTC from Tres Cantos (Madrid), Spain (approximately latitude 40.595865ºN, longitude 3.699069ºW). The recording has been made using an Arrow 7 element yagi and a FUNcube Dongle Pro+ connected to the antenna via a 1m coaxial cable run. The antenna was always held in the horizontal polarization (with respect to the local horizon) and aimed by hand. The recording is in the RAW format used by the Linrad software. This consists of a 41 byte header followed by the stream of IQ samples as little endian 16 bit signed integers. The sample rate is 192ksps and the centre frequency 436.152kHz, so that the signal of interest is at 48kHz within the passband. Doppler correction has been applied using the TLE 1 45857U 20042B 20193.85379087 .00000513 00000-0 81606-4 0 9993<br> 2 45857 98.0133 266.8074 0010022 223.4288 136.6116 14.76202005 1284本数据集为卫星BY70-02（又名BY02）的超高频（UHF）信标录制数据。该卫星每35秒发射一次信标信号，载波频率为436.200 MHz。本次录制于协调世界时（UTC）2020年7月12日11:39:50，录制地点为西班牙马德里特雷斯坎托斯，地理坐标约为北纬40.595865°、西经3.699069°。 本次录制采用7单元Arrow八木天线与FUNcube Dongle Pro+接收机，天线与接收机间通过1米同轴电缆连接。天线始终保持相对于本地地平线的水平极化方式，并通过人工手动对准。 本次录制文件采用Linrad软件所使用的RAW格式存储，文件结构包含41字节的文件头，后续为IQ采样流，采用小端序16位有符号整数格式。采样率为192ksps，中心频率为436.152kHz，因此目标信号位于通带内的48kHz频率处。 已使用两行轨道根数（TLE，Two-Line Element Set）数据对录制数据完成多普勒校正，所用TLE数据如下： 1 45857U 20042B 20193.85379087 .00000513 00000-0 81606-4 0 9993 2 45857 98.0133 266.8074 0010022 223.4288 136.6116 14.76202005 1284