Because there are only antenna and earphone interfaces in lifesaving radio and the kind of acquirable data is little,generally,it is very difficult to test the capabilities of lifesaving radio.
针对某型救生电台只有天线和耳机两个外围接口,数据采集的种类少,性能测试难度较大的问题,设计一种基于虚拟仪器的救生电台综合性能测试系统,通过计算机GPIB总线控制和技术先进的测试转换装置,实时采集救生电台的射频、音频、调制等信号,来分析救生电台的工作频率、发射功率、频率准确度、调制度、灵敏度、选择性、失真度、频率响应等指标参数。
The algorithm of two-antennas direction finding based on time difference to broadcasting station equipped on the plane for saving is firstly introduced,and the connection between time difference and phase difference is established,then the method of attaining the phase difference from the system flat is analyzed.
首先介绍了在救生机载台中双天线时差测向原理,建立了时差与相差之间的关系,然后从系统平台出发,分析了提取相差的方法,同时针对运算误差及 DSP 资源占用的问题,设计了合理的减小误差的方案,并给出了仿真结果。