Compared with other imaging approaches, high resolution angle-angle-range imagery provided by the three dimensional
imaging laser radar increases probability of target identification. Based on scannerless pulsed time-of-flight method, this
paper presents breadboard laser radar for proof-of-principle. A laser transmitter using laser diode flood illuminates a
target area with a relatively short pulse, then a receiver collects the returned energy on a 4x4 PIN diode array where each
pixel measures range respectively. Each of 16 channels consists of a TIA, main amplifier, timing discriminator and a
TDC channel. A processor based on microcontroller processes the output result of all pixels from two TDCs, then
transfers final range data to laptop for visualization. Here we present some preliminary intensity images of target
acquired through indoor experiments. Through these results, the feasibility of direct-detection imaging laser radar for
short-range target identification has been proved. Meanwhile, further development of this system is discussed.
With the development of the laser and radar technology, imaging lidar has been widely used in the fields of military
applications. Without the scanner devices, scannerless imaging lidars have the characteristic of high frame rate, wide
field of view and high reliability. Three kinds of scannerless imaging lidar system, such as based on the phase
scannerless imaging lidar, based on the multiple-slit streak tube imaging lidar and based on the flash lidar have been
analyzed in this paper. Moreover, the principle, the characteristics and limitations were investigated. Valuable
conclusions were proposed for the selection of scannerless imaging lidar in certain circumstance.
With the development of semiconductor laser technology, laser proximity fuzes have been widely used in various kinds
of guided missiles and routine ammunitions. Combined with the current situation, the digital laser fuzes system based on
the FPGA has been proposed in this paper. Combined with the current situation, the system has been divided into
emitting module, receiving module and signal processing module, the three modules have been analyzed in details. In the
emitting module, the driven circuit based on the FPGA has been developed, the laser pulse with 20ns width and 10kHz
repetition frequency have been obtained. Meanwhile, the emitting optical system and receiving optical system have been
designed. In the receiving module, the receiving circuit with preamplifier and A/D sampling and convert circuit have
been developed. In the signal processing module, anti-interference methods were proposed which can find applications in
the laser proximity fuze research.
KEYWORDS: Digital signal processing, Laser processing, Laser systems engineering, Semiconductor lasers, Data acquisition, Target detection, Pulsed laser operation, Laser applications, Field programmable gate arrays, Signal processing
Because means of target detection is simple, laser short-range detection system using analog processing has high False-
Alarm Rate. The requirement of target detection under complicated background can not be satisfied. Based on DSP and
FPGA, this paper presents a mini laser short-range detection system using real-time digital processing. The modularized
idea is applied to design the system. Every function module is designed respectively. The prototype is finally constituted,
which provides algorithm of target identification and acquisition of echo data with hardware platform. The requirement
of future application under strong clutter is satisfied.
With the development of semiconductor laser technology, laser proximity fuzes have been widely used in various kinds
of guided missiles and conventional ammunitions. Conventional laser proximity fuzes consisting of separated
components, have the disadvantages such as large volumes and poor anti-jamming abilities, so are not satisfied with the
modern warfare circumstances. Combined with the separated components, the system has been divided into transmitting
module, receiving module and information processing module, the different modules have been analyzed in detail,. Meanwhile, the transmitting driven circuit has been developed and laser pulse with 20ns narrow width was obtained. In order to meet the multifunction and miniaturization, laser fuzes based on MEMS/MOEMS have been introduced in this paper. Technologies include vertical-cavity surface-emitting laser, integrated resonant-cavity photodetector and refractive micro-optics. The entire structure was roughly 1~2mm thick and 1mm on a side.
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