As an important measure of space detection, lidar has the advantages of high detection accuracy, small volume and low power consumption, and strong anti-electromagnetic interference ability. It has been widely used in airborne and spaceborne platforms to carry out topographical mapping, environmental monitoring, target recognition, rendezvous and docking, etc. Traditional lidar systems have the problems of slow imaging rate and low utilization rate of laser energy when detecting the long-distance small targets. This paper proposes the use of diffractive optics-based laser beam splitting technology to increase the instantaneous field of view. In addition, in order to overcome the contradiction between the scanning field of view and the scanning accuracy of the traditional two-dimensional pendulum mirror, an double optical wedge scanning method is proposed and its scanning pattern is analyzed.
KEYWORDS: Receivers, Signal to noise ratio, Analog electronics, Laser systems engineering, Digital signal processing, Pulsed laser operation, Laser applications, Laser processing, Optical engineering, Ranging
We describe a method based on multichannel time-delay estimation with linear fitting correction for laser time-of-flight (TOF) measurement. The laser TOF measurement system is constructed with a laser source, a stop receiver channel, a reference receiver multichannel, an analog to digital converter (ADC) sampling unit, and a digital signal processing unit. Limited by the sampling rate, the precision of laser TOF measurement is restricted no more than the ADC sampling period in conventional methods. As this problem is considered, multichannel correlation time-delay estimation with linear fitting correction is devised. It is shown that the measuring precision is better than 2 ns with multichannel time-delay estimation and not influenced by signal-to-noise ratio. The experimental results demonstrate that the proposed method is effective and stable.
This paper presents a method which combines with Bilateral Filter and cross cumulative residual entropy. It will be applied to infrared and visible registration. In this algorithm, firstly, according to infrared image and optical image characteristics, we put forward edge extraction algorithm based on the Bilateral Filter. Secondly, we use Cross Cumulative Residual Entropy (CCRE) as the similarity measure to match the reference images and transformed images effectively. Finally, we introduce the idea of calibration to reduce operation time. Bilateral filter can reduce noise and protect edge, and cross cumulative residual entropy uses cumulative distribution function instead of probability density function to overcome the noise on the local minima. The experiment proved that registration is effective.
KEYWORDS: Receivers, Signal to noise ratio, Laser systems engineering, Digital signal processing, Analog electronics, Laser processing, Laser applications, Pulsed laser operation, Time metrology, Signal attenuation
In this paper, a novel method based on multichannel time delay estimation with linear fitting correction for laser time-of-flight (TOF) measurement is described. The laser TOF measurement system is constructed with a laser source, a stop receiver channel, a reference receiver multichannel, an ADC sampling unit and a digital signal processing unit. Limited by the sampling rate, the precision of laser TOF measurement is restricted no more than the ADC sampling period in conventional methods. As this problem is considered, multi-channel correlation time delay estimation with linear fitting correction is devised. It is shown that the measuring precision is better than 2ns with multi-channel time delay estimation and not influenced by SNR. The experimental results demonstrate that the proposed method is effective and stable.
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