时间控制脉冲间隔激光编码方法研究

Research of laser encoding method based on time-controlled pulse interval

激光编码是激光半主动制导武器抵抗激光诱偏干扰的重要措施,现有激光编码具有一定的规律性,很容易被干扰系统所识别破解,而使激光半主动制导武器受到威胁。为此,提出了一种基于绝对精确时间控制的激光脉冲激光编码方法。首先利用北斗授时系统对激光编码端授时,以此得到精确时刻,以绝对精确整秒时刻为参数,根据编码基频大小,按照编码函数一次产生当前时刻所需数量的脉冲时间间隔;然后在后续时刻利用定时器在预产生的时间间隔处产生脉冲信号,并控制脉冲宽度;最后对该编码方法的有效性进行了仿真实验和实际实验验证。实验结果表明,授时精度20 ns,脉冲编码精度优于30 ns。该编码最大的特点是各编码脉冲时间间隔各不相同,无任何规律和周期,是一种准随机分布编码,而且编码函数运算量小,易于实现,具有较强的抗解码能力。

Laser pulse encoding of laser semi-active guided weapon is an important measure to resist the laser decoy jamming. To a certain extent, existing laser pulse encoding methods have regularity, are identified and cracked by jamming system easily, making laser semi-active guided weapons threatened. A time-controlled laser pulse interval encoding method was proposed. First the encoder was timed by BeiDou module to get absolutely precise time, taking the precision moment （hour, minute, second） as parameters, according to the encoding base frequency, time intervals of the pulses required were generated at the current precision moment by the encoding function only once. Then in the subsequent precision moment, pulse signals with pulse width adjusted were generated at time interval using the timer. Finally, the effectiveness and superiority of the method were verified by numerical simulation and real experiments. Experimental results indicate that timing accuracy is 20 ns, and pulse encoding accuracy is less than 30 ns. The method is characterized by various time intervals of pulses, without any regularity and period, small calculating amount of the encoding function, easy to implement, and strong anti-decoding capability.