Parallel laser ranging technology of array type
The paper presents a new parallel laser ranging technology of array type which adopts multi-channel frequency division multiplexing modulation to realize multi-point synchronous measurement. The DDS (direct digital synthesis) technology is used to produce the parallel sine wave signals needed to realize frequency division multiplexing modulation on the lasers of array. The signals are produced by DDS chips under the control of DSP processor. Because phase has a great effect on the measurement precision of the system and the commonly used digital phase detection method -FFT algorithm has its own drawbacks, such as spectral leakage, “non-synchronous sampling etc. which cause errors, so the all-phase FFT is introduced here to remedy these defects. The phase-spectrum value at main spectral line can be directly viewed as the original phase without any correcting measures. The paper elaborates the realization of parallel laser modulation, laser detecting, mixing, synchronous sampling and high-accuracy phase detection using this technology, analyzes the factors which cause errors. The results of preliminary experiment and simulation indicate that the parallel laser ranging technology of array type could be used to realize high-speed high-accuracy parallel measurement.
parallel laser ranging technology of array type frequency division multiplezing modulation all-phase FFT
Xiong Mudi Zhao Rongfang Zhou Aixia
College of Information Science and Technology, Dalian Maritime University, Dalian, China 116026
国际会议
第五届仪器科学与技术国际学术会议(ISIST 2008)Fifth International Symposium on Instrmentation Science and Technology
沈阳
英文
1-7
2008-09-15（万方平台首次上网日期，不代表论文的发表时间）