双频测速应答机灵敏度遥测参数异常下跳原因分析

Analysis of Sensitivity Telemetry Parameter Abnormality of Dual Frequency Speed Transponder

针对某航天发射箭载测控合作目标双频测速应答机灵敏度遥测参数异常下跳问题,深入研究了连续波无线电外测系统的高精度测速原理,根据实际飞行弹道计算出地面连续波跟踪测量雷达系统4个测点相对于双频测速应答机接收天线的方向图,得出在灵敏度遥测参数异常下跳期间,由于迭代制导,火箭姿态变化剧烈,使得各测点的赤道面张角α变化范围较大,大大超出了双频测速应答机接收天线的增益要求,出现接收天线接收的信号变弱从而导致灵敏度在此时段异常下跳的结论。本文可为后续航天发射飞行中出现类似问题时的故障快速定位提供分析思路。

Aiming at the problem that the sensitivity telemetry parameters of the dual-frequency speed measuring transponder of a rocket-borne TT&C cooperative target are abnormal,the high-precision speed measuring principle of the continuous wave radio external measurement system is studied.According to the actual flight trajectory programming,the antenna pattern of four points relative to the dual-frequency transponder receiving is calculated in the ground tracking measurement continuous wave radar system.It can be concluded that under the abnormal sensitivity telemetry parameters during the jump,due to the iterative guidance and dramatic rocket attitude changing,the site of the equatorial angular is larger,which is greatly beyond the dual-frequency radar transponder receiving antenna gain,and the weaker receiving antenna signal will lead to an abnormal jump of the receiving sensitivity at this time.This paper can provide an important theoretical and decision-making basis for the rapid location and trouble shooting of similar problems in subsequent test tasks.