Method to improve the signal-to-noise ratio of photon-counting chirped amplitude modulation ladar

2013 ◽  
Vol 52 (2) ◽  
pp. 274 ◽  
Author(s):  
Zijing Zhang ◽  
Long Wu ◽  
Yong Zhang ◽  
Yuan Zhao
Keyword(s):  
Amplitude Modulation ◽  
Signal To Noise Ratio ◽  
Photon Counting ◽  
Signal To Noise ◽  
Noise Ratio

scholarly journals Three-Dimensional Imaging via Time-Correlated Single-Photon Counting

2020 ◽  
Vol 10 (6) ◽  
pp. 1930
Author(s):  
Chengkun Fu ◽  
Huaibin Zheng ◽  
Gao Wang ◽  
Yu Zhou ◽  
Hui Chen ◽  
...  
Keyword(s):  
3D Imaging ◽  
Single Photon ◽  
Signal To Noise Ratio ◽  
Photon Counting ◽  
Three Dimensional ◽  
Similarity Index ◽  
Signal To Noise ◽  
Single Photon Counting ◽  
Imaging Results ◽  
Noise Ratio

Three-dimensional (3D) imaging under the condition of weak light and low signal-to-noise ratio is a challenging task. In this paper, a 3D imaging scheme based on time-correlated single-photon counting technology is proposed and demonstrated. The 3D imaging scheme, which is composed of a pulsed laser, a scanning mirror, single-photon detectors, and a time-correlated single-photon counting module, employs time-correlated single-photon counting technology for 3D LiDAR (Light Detection and Ranging). Aided by the range-gated technology, experiments show that the proposed scheme can image the object when the signal-to-noise ratio is decreased to −13 dB and improve the structural similarity index of imaging results by 10 times. Then we prove the proposed scheme can image the object in three dimensions with a lateral imaging resolution of 512 × 512 and an axial resolution of 4.2 mm in 6.7 s. At last, a high-resolution 3D reconstruction of an object is also achieved by using the photometric stereo algorithm.

Coincidence Photon-Counting Laser Ranging for Moving Targets With High Signal-to-Noise Ratio

2014 ◽  
Vol 26 (15) ◽  
pp. 1495-1498 ◽  
Author(s):  
Zeyu Bao ◽  
Zhaohui Li ◽  
Yafan Shi ◽  
E. Wu ◽  
Guang Wu ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Photon Counting ◽  
Laser Ranging ◽  
High Signal ◽  
Moving Targets ◽  
Signal To Noise ◽  
Noise Ratio

scholarly journals Suprathreshold Perception of Tonal Components in Noise Under Conditions of Masking Release

2012 ◽  
Vol 98 (3) ◽  
pp. 451-460 ◽  
Author(s):  
Jesko L. Verhey ◽  
Stephan J. Heise
Keyword(s):  
Amplitude Modulation ◽  
Signal To Noise Ratio ◽  
Baseline Condition ◽  
Signal To Noise ◽  
Noise Background ◽  
Tonal Component ◽  
Masking Release ◽  
Low Levels ◽  
Noise Ratio

Many technical sounds contain tonal components in a noise background. The present study investigates how such tonal components embedded in noise are perceived under conditions of enhanced detectability of the tone due to (i) amplitude modulation of the noise background or (ii) interaural disparities in the signal's phase. To quantify the sensation elicited by a tonal component in these masking-release conditions, the listeners are asked to adjust the level of the tone to have the same magnitude of tonal content (German “Tonhaltigkeit”) or to be perceived as equally loud as a tone which is masked by an unmodulated noise and presented diotically (baseline condition). For both sensations the signal-to-noise ratio at equal magnitude of the sensation is lower for the tone in the masking-release conditions than for the baseline condition. This is mainly due to the lower masked threshold of the tone in masking-release conditions. The eff ect is most prominent at low levels and decreases towards higher levels. A high correlation is observed between the data for the magnitude of tonal content and the partial loudness of the tone, demonstrating the similarity between these two sensations.

scholarly journals Bitstream Photon Counting Chirped AM Lidar with Digital I/Q Demodulation

2020 ◽  
Author(s):  
Brian Redman
Keyword(s):  
Integrated Circuits ◽  
Single Channel ◽  
Signal To Noise Ratio ◽  
Photon Counting ◽  
Complementary Metal Oxide Semiconductor ◽  
Local Oscillator ◽  
Oxide Semiconductor ◽  
Signal To Noise ◽  
Receiver Architecture ◽  
Noise Ratio

This paper is a follow-up to two previous papers, one introducing the new bitstream Photon Counting Chirped Amplitude Modulation (AM) Lidar (PC-CAML) with the unipolar Digital Logic Local Oscillator (DLLO) concept, and the other paper introducing the improvement thereof using the bipolar DLLO. In that previous work, there was only a single channel of digital mixing of the DLLO with the received photon counting signal. This paper introduces a new bitstream PC-CAML receiver architecture with an in-phase (I) digital mixing channel and a quadrature phase (Q) digital mixing channel for digital I/Q demodulation with the bipolar DLLO to improve the signal-to-noise ratio (SNR) by 3 dB compared to that for the single digital mixing channel with the bipolar DLLO and by 5.5 dB compared to that for the single digital mixing channel with the unipolar DLLO. (patent pending) The bipolar DLLO with digital I/Q demodulation architecture discussed in this paper retains the key advantages of the previous bitstream PC-CAML with a DLLO systems since it also replaces bulky, power-hungry, and expensive wideband RF analog electronics with digital components that can be implemented in inexpensive silicon complementary metal-oxide-semiconductor (CMOS) read-out integrated circuits (ROICs) to make the bitstream PC-CAML with a DLLO more suitable for compact lidar-on-a-chip systems and lidar array receivers than previous PC-CAML systems. This paper introduces the bipolar DLLO with digital I/Q demodulation receiver architecture for bitstream PC-CAML and presents the initial signal-to-noise ratio (SNR) theory with comparisons to Monte Carlo simulation results.

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