Intensity‐modulated diode laser radar using frequency‐modulation/continuous‐wave ranging techniques

Stann, Barry L.; Ruff, William C.; Sztankay, Zoltan G.

doi:10.1117/1.601067

Cited by 88 publications

(28 citation statements)

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“…Researchers at ARL have tried to overcome these difficulties by amplitude modulating (AM) the optical carrier frequency at RF wavelengths (see Figure 3). [4][5][6] This allows a coherent laser system to perform continuous wave frequency modulation (CW-FM) at RF frequencies. Therefore, for the chirped AM ladar, an RF electrical signal can be used as the local oscillator instead of an optical LO.…”

Section: Case Study: Swir Amplitude Modulated Ladar Tradesmentioning

confidence: 99%

Modeling laser radar systems in the Night Vision Integrated Performance Model (NV-IPM)

et al. 2014

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Active imaging systems are currently being developed to increase the target acquisition and identification range performance of electro-optical systems. This paper reports on current efforts to extend the Night Vision Integrated Performance Model (NV-IPM) to include laser radar (LADAR) systems for unresolved targets. Combining this new LADAR modeling capability with existing sensor and environment capabilities already present in NV-IPM will enable modeling and trade studies for military relevant systems.

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Section: Case Study: Swir Amplitude Modulated Ladar Tradesmentioning

confidence: 99%

Modeling laser radar systems in the Night Vision Integrated Performance Model (NV-IPM)

et al. 2014

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“…The frequency modulation method provides better resolution than the amplitude modulation method, in general [3] [4]. However, it needs an expensive frequency sweeping laser source.…”

Section: Introductionmentioning

confidence: 98%

An initial phase error elimination in a laser scanner with a multiple phase demodulation method

Yoon

Kang

Song

et al. 2009

2009 International Symposium on Optomechatronic Technologies

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To have higher resolution of distance in the laser scanner using the phase demodulation method, to demodulate using an intermediate frequency is advantageous. This method is called the multiple phase demodulation method. In the multiple phase demodulation method several frequencies are used for signal processing. These signals are made from the oscillator and the programmable clock source. Even though the clock source is well synchronized with the oscillator, the initial phase error problem can be occurred since the operating points of both signal sources are not exactly simultaneous. In this work, the experimental results are presented to show how the initial phase error problem is solved.

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“…The photocurrent is amplified and mixed with the undelayed attenuated modulation current to produce the intermediate frequency (IF) signal. 1 The intermediate frequency depends on the distance and motion between the sensor and the target.…”

Section: Introductionmentioning

confidence: 99%

Influence of atmospheric aerosol single backscattering on waveform of target-reflected signal in incoherent frequency-modulation continuous-wave short-distance laser detection

Liu

2011

Opt. Eng

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The atmospheric aerosol scattering is considered as a major distortion mechanism in laser detection. Its influence on the targetreflected signal in incoherent frequency-modulation continuous-wave (FMCW) short-distance laser detection, which has not yet been well addressed, has been theoretically and experimentally studied in this paper. Assuming intensity of one-particle backscattering as an interference signal, the expression of this interference signal is calculated based on the model of one-particle backscattering and the Mie theory. Only single scattering is considered when optical thickness of the particle group is low. Broadenings of the hybrid signal formed with the particle group backscattering signal and the target-reflected signal are emulated, combining the model of particle group backscattering with the particle distribution function. The broadening time caused by the particle group is far less than the minimum response time of the photodiode. Experimental results confirm that the output voltage of the hybrid signal is identical to the output voltage of the target-reflected signal, except for attenuation in amplitude. Therefore, the incoherent FMCW short-distance laser detection shows a good capability of antiaerosol interference, which is very important for signal processing and target identification. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Intensity‐modulated diode laser radar using frequency‐modulation/continuous‐wave ranging techniques

Cited by 88 publications

References 0 publications

Modeling laser radar systems in the Night Vision Integrated Performance Model (NV-IPM)

Modeling laser radar systems in the Night Vision Integrated Performance Model (NV-IPM)

An initial phase error elimination in a laser scanner with a multiple phase demodulation method

Influence of atmospheric aerosol single backscattering on waveform of target-reflected signal in incoherent frequency-modulation continuous-wave short-distance laser detection

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