前视声纳实时成像算法与DSP实现

Real-time imaging algorithm of forward looking sonar and implementation based on DSP

前视声纳通道数目多、采样频率高,获取方位和距离信息的运算量大,对原始回波图像显示质量和速度提出非常高的要求。通过分析坐标变换和像素亮度填充法对成像质量的影响,根据系统指标设计了前视声纳视域范围内回波数据的显示算法,解决了声纳原始图像的显示质量问题;利用DSP丰富接口资源和EDMA动态调表技术,设计了声纳原始图像实时显示方案,很大程度上突破了实时显示的瓶颈。通过水池拉距实验验证了高质量实时显示方案的有效性。

The multichannel and high sampling frequency characters of forward looking sonar lead to numerous calculations for azimuth and distance information, which demands a high quality and speed for the original echo image display. A display algorithm of echo data is designed in the sight scope of forward looking sonar, which solved the problem of sonar original imaging quality, through analyzing the influence of coordinate conversion and pixel luminance filling methed on imaging quality. The bottle-neck of real-time display can be surmounted to a great extent. Using rich interface resources of DSP and EDMA dynamic-adjustment technology, a realtime display schemes for sonar original image is designed. Validity of the high quality realtime display scheme is verified by experiment in pool.