研究目的
To propose a method using transmission pulse spacing modulation to realize high-frequency sampling with low-speed analog-to-digital converter for improving the accuracy of time-of-flight (TOF) measurement and signal-to-noise ratio (SNR) in lidar ranging systems.
研究成果
The proposed method successfully achieves high-frequency sampling with low-speed ADCs through transmission pulse spacing modulation, improving the time resolution to 625 ps and enhancing SNR through data accumulation. Simulation and experimental results validate the method's feasibility and superiority for long-range lidar applications.
研究不足
The method's effectiveness is contingent upon the target objects remaining still during several transmitting periods, and the SNR improvement is dependent on the number of accumulated times of the data.
1：Experimental Design and Method Selection:
The method involves modulating the transmission pulse spacing to achieve high-frequency sampling with low-speed ADCs, leveraging the relationship between modulation spacing of driving pulse and sampling period.
2：Sample Selection and Data Sources:
The experiment uses a laser emitter model SPLLL90 and a photoelectric detector BPW34BS to convert echo signals into electrical signals, which are then amplified by a high gain linear preamplifier MAX
3：List of Experimental Equipment and Materials:
38 Laser emitter SPLLL90, photoelectric detector BPW34BS, preamplifier MAX3806, mixed signal oscilloscope Tektronix MSO4104B, and Altera's Cyclone IV series FPGA chips.
4：Experimental Procedures and Operational Workflow:
The procedure includes modulating transmission pulse spacing, sampling the echo signal with low-speed ADCs, reconstructing the echo signal from stored data, and enhancing SNR through data accumulation.
5：Data Analysis Methods:
The analysis involves reconstructing the echo signal with high time resolution and improving SNR through data accumulation.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
