Infrared modulation detecting technology of electro-optic radar
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摘要: 因红外调制检测技术用于检测扫描积分型光电雷达调制器的工作性能，为此设计一套与调制器固有属性匹配的光学传递和激光准直系统。运用标准伺服控制理论为调制脉码信号建立Ⅲ型条件稳定的轴系扫描模型，通过截获、跟踪视场切换及驱动电压调幅，使模拟红外汇聚的激光扫描光束与3°×3°、40′×40′十字靶标重合，计量扫描视场及零位精度偏差，采集标定反射镜振动位置和扫描频率的过零脉冲，用以实现红外信号调制性能的检测。测试结果表明，该红外调制检测技术对调制器扫描视场的精度测量优于0.5′(1σ)，零位误差的精度测量不大于5′(1σ)，系统检测的相对误差不大于±1%，满足光电雷达红外光轴瞄准线工艺装配的精度要求，可应用于线列扫积型调制器的性能检测。Abstract: Infrared modulation detection technique is used to detect performance of scanning integral type electro-optical radar modulator. An optical transmission and laser collimation system are designed in this paper, which matches inherent properties of the modulator. Based on standard servo control theory, axis scanning model of Ⅲ system with stable condition is established for modulation of pulse code signal. Through FOV's switching of intercepting and tracking, and modulation of driving voltage amplitude, simulated infrared-converged laser scanning beam is coincided with 3°×3°, 40′×40′ cross target. Deviation of scanning FOV and zero position precision are metered, calibration mirror vibration position and scanning frequency zero-crossing pulse are collected in order to achieve infrared signal modulation performance detection. Results show that accuracy of infrared modulation detection technique is better than 0.5′(1σ), accuracy of zero error is less than 5′(1σ), and relative error of the system is less than ± 1%.It meets accuracy requirements of electro-optical radar in infrared optical axis assembly process, and can be applied to linear array scanning integral type modulator performance testing.
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图 2 调制器在红外物镜组件工作原理示意图
Figure 2. Working schematic of modulator in infrared objective lens
表 1 测试结果
Table 1 Test results
测试项 3°×3°截获场 40′×40′跟踪场 激光理论偏转角度 1.5° 20′ 扫描反射镜理论振幅 0.75° 10′ 驱动工作电压 9~13 V 17~20 V 扫描视场精度 优于0.5′(1σ) 优于0.2′(1σ) 零位误差精度 不大于5′(1σ) 不大于5′(1σ) 
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