抗多径信道遥测数据分集接收合成技术的研究与实现

Research and realization of diversity receiving and synthesis technology dealing with multipath channel telemetry data

当武器装备在舰上井内或筒内进行发射试验时,因遮挡、多路径等影响致使地面设备接收解调的遥测信号弱,误码率较高,影响遥测和安控指令的对接检查,导致无法准确掌握目标工作状态,不利于试验指挥决策,严重影响试验进程。为了提高信号解调信噪比、保证信号正确解调,提出一种最大比空间集接收合成方法,通过在井或筒壁上多布设了一个发射天线,地面设备将接收到的两路信号先进行极化分集合成,再进行空间分集接收合成解调接收。经过试验测试表明,该方法能有效消除遮挡、多径和信号快速衰落等对接收解调的影响,接收解调的遥测数据实时丢帧率和误码率满足使用需求。

When weapons are launched from the wells or canisters on the ship,due to the effects of occlusion,multipath,etc.,the demodulated telemetry signals received by the ground equipment are weak,and the bit error rate(BER)is high,which affects the docking inspection of the telemetry and security control commands.As a result,the working state of the target cannot be accurately grasped,which is not conducive to test command and decision making,and seriously affects the test process.In order to improve the signal⁃to⁃noise ratio(SNR)of signal demodulation and ensure the correct demodulation of the signal,a method of receiving and synthesis with the maximum ratio space is proposed.By setting an additional transmitting antenna on the wall of the well or canister,the polarization diversity synthesis of the ground equipment received signals from two channels is carried out first,and then spatial diversity reception synthesis demodulation reception is performed.The results of testing experiments show this method can effectively eliminate the effects of occlusion,multipath and fast signal fading on receiving demodulation,and the real⁃time frame loss rate and BER of the received and demodulated telemetry data can meet the requirements of application.