遥测接收站火焰衰减计算模型及应用

火焰衰减是运载火箭遥测系统设计及地面测站布站须重点考虑的问题.以火焰衰减对遥测地面站接收信号的影响为出发点,推导了火焰夹角与测站位置及火箭俯仰角之间的数学关系式,在此基础上依据已有的火焰夹角与火焰衰减关系模型,设计了理论弹道全程中地面测站火焰衰减量的计算程序.以某型遥测设备的接收信道链路为依据,在实际任务中对火焰衰减模型进行验证,结果证实模型具有一定的准确性,并在此基础上分析火焰衰减对遥测地面站某型变频器参数设置的影响,确定了实际任务中更加合理的变频器参数.

A Flame Attenuation Computing Model for Telemetry Stations and Its Applications

Flame attenuation is a key issue to be considered in design of telemetry systems for spacecraft launch vehi- cles and distribution of ground instrumentation stations. Starting from the influence of flame attenuation on signals received by a ground telemetry station, a mathematical relationship is derived between the flame angle and the position of the ground instrumentation station and the pitch angle of the launch vehicle. A program is designed with existing flame angle-flame attenuation relationship model for computing the flame attenuation of all ground instrumentation stations along the theoretical trajectory. The flame attenuation model is verified in an actual mission with the receive channel chain of a ground telemetry station and it is proved that the model is accurate to a certain extent. Furthermore, the influence of flame attenuation on parameter settings of a frequency converter of a telemetry station is analyzed and more appropriate settings are determined for the frequency converter for mission operations.