Method of eliminating saturation drift error of laser fuze
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摘要: 为保证激光引信在近程的测距精度，文中针对恒比定时法在激光接收器饱和时会发生跳变点前移的现象，提出一种基于回波功率方程的误差补偿算法。通过线性化模型描述脉冲信号，推导了饱和漂移误差的解析表达式，分析了其随回波信号上升沿斜率的变化规律。根据回波功率方程，在小角度入射特定目标的条件下，建立饱和漂移误差补偿数学模型；通过实验标定误差补偿表达式，得到修正后的测距公式，验证了饱和漂移误差补偿方法的有效性。实验结果表明：激光引信在回波信号饱和时测距有较大偏差，最大偏差达到1.4 m；采用误差补偿方法后，可使偏差控制在0.5 m以内。研究可为小型化高精度激光引信测距系统设计提供理论参考。Abstract: It is discovered that the jump point of the constant fraction discrimination(CFD) method moves forward when the laser receiver is saturated. In order to guarantee the range precision of laser fuze in short range, an error compensation algorithm based on the echo power equation was proposed for results correction. Firstly, based on a linear model to describe the pulse signal, the analytic expression of the saturation drift error was derived, and the relationship between drift error and echo signal slope was analyzed. Then, according to echo power equation, the compensation model of saturation drift error was established, in the case of the laser incidence on a specific target with a small angle. The error compensation expression was calibrated by experiment. Finally, a modified ranging formula was obtained. And the error compensation effect was tested by experiment. The results show that when the signal is saturated, the ranging deviates from the actual distance, and the deviation can be up to 1.4 m; due to the use of error compensation method, ranging deviation can be maintained between 0.5 m. Thus, this work can provide a theoretical reference for the design of miniaturized high precision laser proximity fuze.
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Key words:
- laser proximity fuze /
- error compensation model /
- saturation drift error /
- CFD
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