Conceptual Design of the CZMIL Data Acquisition System (DAS):Integrating a New Bathymetric Lidar with a CommercialSpectrometer and Metric Camera for Coastal Mapping Applications

摘要

The CZMIL system is a new generation airborne bathymetric and topographic remote sensing platform composed of anactive lidar, passive hyperspectral imager, high resolution frame camera, navigation system, and storage media runningon a linux-based Gigabit Ethernet network. The lidar is a hybrid scanned-flash system employing a 10 KHz green laserand novel circular scanner, with a large aperture receiver (0.20m) having multiple channels. A PMT-based segmenteddetector is used on one channel to support simultaneous topographic and bathymetric data collection, and multiple fields-of-view are measured to support bathymetric measurements. The measured laser returns are digitized at 1 GHz toproduce the waveforms required for ranging measurements, and unique data compression and storage techniques areused to address the large data volume. Simulated results demonstrate CZMIL's capability to discriminate bottom andsurface returns in very shallow water conditions without compromising performance in deep water. Simulatedwaveforms are compared with measured data from the SHOALS system and show promising expected results. Thesystem's prototype is expected to be completed by end of 2010, and ready for initial calibration tests in the spring of2010.