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激光相干探测由于其高灵敏及抗干扰特性,在现代精密检测中应用逐渐广泛。由于目标二维信息更能反映目标特性,利用PCI8522采集卡与振镜扫描控制信号进行模拟量触发源(ATR)触发同步,快速获取目标二维多普勒频谱。对室内裸露以及伪装网覆盖的旋转漫反射目标进行二维频谱提取,二维频谱图为31pixel×31pixel,目标存在区的频谱范围在3~7MHz之间,通过二维频谱图能对典型目标轮廓进行识别。对图像恢复算法中引入的噪声进行分析,结果表明:其中目标覆盖区中轴线附近噪声概率较大,主要由200kHz的频谱门宽引起;另一类噪声为背景无多普勒频移的5MHz中心信号被频谱门宽限制所致,可作为目标轮廓衬底,无需抑制。该研究为激光相干探测在动目标伪装识别中的应用奠定基础。
Due to its high sensitivity and anti-interference properties, laser coherent detection is widely used in modern precision inspection. Because the target two-dimensional information can better reflect the target characteristic, the target two-dimensional Doppler spectrum can be quickly acquired by using the triggering source of analog trigger (ATR) by using the PCI8522 acquisition card and the galvanometer scanning control signal. Two-dimensional spectrum extraction was performed on the indoor and outdoor camouflage mesh covered rotating diffuse targets. The two-dimensional spectrum was 31 pixels × 31 pixels and the spectrum of the target existence region was between 3 and 7 MHz. The two- Identify. The noise introduced in the image restoration algorithm is analyzed. The results show that the probability of noise near the axis in the target coverage area is large, which is mainly caused by the spectral width of 200 kHz. Another kind of noise is the 5 MHz center with no Doppler shift in the background The signal is limited by the spectral gate width, and can be used as the target outline substrate without suppression. This study lays the foundation for the application of laser coherent detection in the recognition of moving target camouflage.