KEYWORDS: Signal detection, Imaging systems, Signal to noise ratio, Clouds, Sensors, Ocean optics, Data processing, Satellites, Image processing, Interference (communication)
The lightning imager is one of the three main loads of FY-4 Meteorological Satellite. It is the first optical remote sensing device for lightning detection at high altitude in our country. It runs on the geostationary orbit, and the technical index of lightning detection has reached the international leading level. Aiming at the characteristics of high orbit lightning detection, this paper analyzes the methods of lightning detection. The lightning imager uses spectral features, time and space differences between transient lightning and slowly changing clouds, land and ocean background noise. The lightning signal is detected by combining spectral filtering, time filtering, spatial filtering and frame frame background removal, and the continuous multi frame data is in real time on orbit. Theory, target extraction and coding. Through orbit verification, the lightning imager can detect the lightning signals of different intensity in the coverage area in real time, and predict, warn and track the strong convective weather in the region more timely and accurately.
This paper focuses on the issue of CCD remote sensing image compression. Compared with other images,
CCD remote sensing image data is characterized with high speed and high quantized bits. A high speed CCD
image compression system is proposed based on ADV212 chip. The system is mainly composed of three
devices: FPGA, SRAM and ADV212. In this system, SRAM plays the role of data buffer, ADV212 focuses
on data compression and the FPGA is used for image storage and interface bus control. Finally, a system
platform is designed to test the performance of compression. Test results show that the proposed scheme can
satisfy the real-time processing requirement and there is no obvious difference between the sourced image and
the compressed image in respect of image quality.
With the rapid development of semiconductor technology and laser technology, a kind of proximity fuze named
pulsed laser proximity fuze has been applied. Compared with other fuzes, pulsed laser proximity fuze has high ranging
precision and strong resistance to artificial active interference. It is an important development tendency of proximity fuze.
The paper analyze the characteristic of target echo of laser signal, and then make theoretical analysis and calculation on
the laser signal transmission in the smog. Firstly, use the pulse width of 10ns semiconductor laser fuze to do typical
targets experiment, to get the echo information of target distance is 5m; then to do smog interference experiment, by
comparing the pulse width amplitude and backscattering signal amplitude of laser fuze in simulation and experiment,
analyzing the effect of anti-clutter, providing the evidence for the subsequent of circuit of signal amplification and
processing.
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