Precision Data Acquisition Of Laser 3D Imaging Radar

Data acquisition, preprocessing and bulk transfer has a wide of increasingly applications in the fields of laser rangefinder, laser 3D imaging radar, video surveillance, stereoscopic display, industrial control applications, biomedical engineering and scientific research and so on,whose requirments satisfy with high capabilities,such as real-time system acquisition,well preprocessing, transfer rate and so on. With the improvement of microelectronics technology, FPGA with the lower price and optimization of electronic design solutions,data collection, pretreatment and bulk transfer method based on FPGA has been accepted by more research institutions, universities and corporate. Data acquisition devices as the leading edge of laser 3D imaging radar receiving end,bear data acquisition, caching, transformation and transmission tasks, which has a pivotal role. Therefore, there is an important practical significance for the design featured with a high volume of data, real-time, highly scalable, highly integrated, cost-effective.The paper describes the research background of the laser 3D imaging radar technology in domestic and overseas. According-to the requirements of 3D imaging radar system,the paper researches the single-channel acquisition technology for the laser phase ranging and multi-channel high-speed data acquisition technology for pulse laser 3D imaging Ladar.The single-channel acquisition system in laser phase ranging uses ADC(analog to digital converter) to achieve the data of laser echo.the core hardware platform based on Altera’s FPGA has lots of functions,such as data caching,processing across the clock domains,dedicated FFT design,the drive of ADC chip and USB chip, digital filtering. The multi-channel high-speed acquisition system uses multi-channel ADC to achieve echo data parallelly.Xilinx’s FPGA is as the core control hardware platform,whose functions are data alignment, multi-level crossing the clock domains and cache processing,the fine correction based TDC algorithm for the bulid-in light path of laser, ethernet transmission and the driver of the ADC chip.In addition, excepted for designing algorithms and processing simultaneously,the paper researched into architecting the verification platform in the modelsim,maltab and komodo software by the methods of assertions and constrained random verification,which has improved the accuracy of the RTL code design and shortened the development cycle.The paper presents two data acquisition systems,which have to undergo device selection, algorithm model design, RTL-level code design, software debugging and optimization of the experimental results.According to the practical test, data acquizition system based on FPGA has a lot of good characteristics with high-speed acquisition,real-time processing,high-level of integration,scalability,low-cost,whose advantages are also applocated to other fields,availablly higher value.