Weak pulse luminous signs detection apparatus and method

Abstract

The invention discloses a feeble pulse optical signal detection device and a detection method thereof. The device comprises a high-sensitivity multiplier phototube, a preamplifier, a high-speed digital signal processor and a computer; the high-speed digital signal processor is divided into a high-speed A / D unit, an automatic threshold value setting unit, a single-photon discrimination output unit, a self-adapting pulse width matched filtering unit, a pulse extraction, positioning and output unit and a demodulation unit; the high-speed digital signal processor realizes the single-photon discrimination and communication signal processing by software. The detection device and the detection method can solve the difficult problems of detecting and extracting the pulse optical signal under the different applied occasions, background noise and pulse distortion; and the device is based on a high-speed DSP chip, has low cost, high integration level, certain intelligence, high sensitivity, strong antinoise capacity, low error rate, a simple structure and light weight, and can be used in detection for modulating the feeble pulse optical signal of the pulse position in free space laser communication.

Description

technical field [0001] The present invention relates to a weak pulse light signal detection device under background noise, in particular to a weak pulse light detection device based on a high-speed digital signal processor (DSP), automatically setting thresholds and self-adaptive pulse width single-photon discrimination and counting technology The signal detection device and detection method can accurately detect and extract the weak pulse position modulated pulsed light signal under the condition of background noise, and then correctly demodulate the accurately extracted pulsed light signal on this basis, and the demodulated The results are displayed and stored in real time. Background technique [0002] With the continuous development of pulsed laser technology, laser is more and more widely used in the field of free space laser communication, the transmission distance is also increasing, and the application occasions are becoming more and more diversified. At the same tim...

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Problems solved by technology

[0008] The problem to be solved by the present invention is to overcome the difficulties encountered in the above-mentioned traditional photoelectric detection technology and general single photon detection technology in the application of free space laser communication, and to provide a Weak pulsed light signal detection device and detection method, the device can solve the difficult problem of pulsed light signal detection and extraction under different application occasions, background noise and pulse distortion, based on high-speed DSP chip, low cost, high integration, has a certain Intelligent, high sensitivity, strong anti-noise ability, low bit error rate, simple structure and light weight, can be used for the detection of pulse position modulation weak pulse light signals in free space laser communication

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