Abstract
Ghost imaging (GI) lidar, as a novel remote sensing technique, has been receiving increasing interest in recent years. By combining pulse-compression technique and coherent detection with GI, we propose a new lidar system called pulse-compression GI lidar. Our analytical results, which are backed up by numerical simulations, demonstrate that pulse-compression GI lidar can obtain the target's spatial intensity distribution, range and moving velocity. Compared with conventional pulsed GI lidar system, pulse-compression GI lidar, without decreasing the range resolution, is easy to obtain high single pulse energy with the use of a long pulse, and the mechanism of coherent detection can eliminate the influence of the stray light, which is helpful to improve the detection sensitivity and detection range.
Highlights
Ghost imaging (GI) is a novel non-scanning imaging method to obtain a target’s image with a single-pixel bucket detector [1, 2, 3, 4, 5, 6, 7]
The range image was obtained by using simple pulse ranging method, while the azimuth images were reconstructed by computing intensity fluctuationcorrelation function between the receiving signal and reference spatial intensity distribution
In order to obtain high range resolution, it requires a laser with shorter pulse width and a detector with boarder response bandwidth, which usually means that the transmitting system’s single pulse energy will be relative low for pulsed 3D GI lidar with a high pulse repetition frequency (PRF)
Summary
Ghost imaging (GI) is a novel non-scanning imaging method to obtain a target’s image with a single-pixel bucket detector [1, 2, 3, 4, 5, 6, 7]. A pulsed three-dimensional (3D) GI lidar was invented and high-resolution 3D image of a natural scene at about 1.0 km range was reported [12]. In this system, the range image was obtained by using simple pulse ranging method, while the azimuth images were reconstructed by computing intensity fluctuationcorrelation function between the receiving signal and reference spatial intensity distribution. A Chirped-AM light is emitted, and the return light is received by coherent detection and pulse-compression Based on this technique, high range resolution and long detection range can be obtained simultaneously [15]. The paper is organized as follows: in Section II, the system setup and theoretical scheme, including the signal model, light propagation, signal detection, image reconstruction and correction method, is presented; after that, in section III, the numerical results are presented to back up our theoretical result and some discussions on our proposed GI lidar and conventional pulsed 3D GI lidar are given; in Section IV, the conclusion is made
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