| The detecting technology based on lidar is increasingly developing and becomes one of the primary methods for studying environment. Airborne lidar is a kind of advanced remote sensing technology of detecting underwater environment. It makes use of laser emitting and incepting equipments on plane to realize certain measure through high-power and narrow pulse laser.In this paper, an airborne lidar measurement method is proposed for forecasting and monitoring marine red tide. The method detects lidar backscattering signal under water to obtain the relevant changing parameters to the red tide growth. The airborne lidar is mobile, agile, real-time and covers large area so that it is more efficient than the traditional measure methods, such as marine apparatus, satellite remote sensing and so on. The new conception will be the basic theory of analysing multi-parameter to forecast red tide. In the measured water, the laser's transmitting characteristic is detailedly discussed, including the reciprocity of lidar and water, suspending particulate and red tide particulate. The model of dependence relation between the lidar elastic scattering light and red tide density will be established based on above theories. The scattering signal will be measured. At the same time, the model of dependence relation between lidar inelastic scattering light and seawater temperature, salinity will be established. And the inelastic scattering signal will be measured by double-brim detecting technology. The theory model will be established to detecting and forecasting red tide by measuring red tide particulate, water temperature and salinity. Otherwise, the structure of lidar detecting system will be designed. The system adopts photoelectric detection and effectual signal processing method, analyses the specifically physical phenomenon of reciprocity between lidar and underwater matter, and obtain the required parameters. By detecting the three parameters, red tide could be forecast and monitored.In addition, the monitoring model will be evaluated by simulation and validated efficacious and feasible. |
