高速飞行器低空级间分离时统方案研究

Study on Time Synchronization of High-Speed Aircraft Low Altitude Stage Separation

摘要:

飞行器与助推火箭在低空、高速环境下同时执行整流罩抛罩与级间分离时，高动压造成干扰流场建立时间短、气动干扰力大、飞行器姿态角变化迅速，导致飞行器与火箭分离后维持姿态稳定可控的时间窗口仅有数十毫秒，火箭在级间分离时刻需要向飞行器发送高精度时统指令，以保证飞行器在可控的时间窗口内起控；基于异步RS-422通信时统指令与分离连接器短路环时统指令，设计了冗余的高精度级间分离时统方案，并在422时统指令中加入纠错标志以解决通信误码或丢帧引起的时统误差问题，相较常规的行程开关或短路环时统装置具有更高的时统精度、更强的容错能力与可测试性；通过地面试验与飞行试验，验证了时统方案满足时统精度要求。

Abstract:

When the aircraft and the booster rocket simultaneously perform fairing throw and separation stage at low altitude and high speed, high dynamic pressure results in short establishment time of interference flow field, large aerodynamic force interference and rapid change of aircraft attitude angle, as a result, the time for the aircraft to maintain attitude stable and controllable after separation with the rocket is only tens of milliseconds, the rocket needs to send high-precision time synchronization instructions to the aircraft at the time of stage separation to ensure that the aircraft can start control within a controllable time; Based on asynchronous RS-422 communication time series instruction and separation connector break-wire switch time series instruction, design a redundant stage separation time synchronization scheme, and add error correction mark to 422 time system instruction to solve the problem of time synchronization accuracy reduction cause by communication error or frame loss, compare with the conventional travel switch or break-wire switch time system device, it has higher time synchronization accuracy, stronger fault tolerance and testability; Through ground test and flight test verify that the time series scheme meets the accuracy requirements of time synchronization.