Repetition pulse with sub-microsecond arising time, high voltage and large current, has been widely utilized in the field of production and scientific research, in which the gas spark switch is usually selected. Howev...
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Repetition pulse with sub-microsecond arising time, high voltage and large current, has been widely utilized in the field of production and scientific research, in which the gas spark switch is usually selected. However, due to the recovery property of gas ionization, it is hard to get the repeated switch-on and switch-off at a high rate towards the conventional gas spark switch. Owing to the reliably triggering and faster arising time, the hydrogen thyratron is found to be more suitable for the switch to generate the repetition pulse at a high rate. In this paper we proposed a novel design of repetition pulse, in which it get a several times high voltage output based on the inductive-adder, by using the hydrogen thyratron switch with an operating voltage, and then we analyze the magnetic field distribution under the structure of the coaxial cable and describe the design of high voltage repetition pulse in details.
Frequency modulation continuous wave (FMCW) laser detection method, which combines the principle of FM radio ranging and laser radar, has the advantages of accurate range and prevent interference. In this paper, a dri...
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Frequency modulation continuous wave (FMCW) laser detection method, which combines the principle of FM radio ranging and laser radar, has the advantages of accurate range and prevent interference. In this paper, a driver module has been designed for a laser diode used in a laser detector by FMCW mode. The driver module has the advantages of compact structure and is suitable for use in some certain situation. Also, the driver can be used for linear FMCW small signal modulation. The modulation frequency can be up to 80 MHz, and the output optical power can be stabilized in 0.81% within 120 seconds. By means of laboratory tests, the usability of the driver on this module has been proved in laser detection.
It is known that detecting small targets in remotely sensed image is difficult and challenging work. Filter neural network is designed to detect target which based morphological, structure element is used as network p...
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It is known that detecting small targets in remotely sensed image is difficult and challenging work. Filter neural network is designed to detect target which based morphological, structure element is used as network p...
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It is known that detecting small targets in remotely sensed image is difficult and challenging work. Filter neural network is designed to detect target which based morphological, structure element is used as network parameter, by competition and cooperation, network parameter is adjusted. Morphologic changed-weight neural network algorithm is used to realize small infrared target detection under complex background. Experimental results of using the above detector to detect real infrared targets are also included. These results demonstrate that the new detector yields a promising solution for the detection problems of small targets.
In order to solve the problems that the timing opening of the carrier projectile for dispersion of the bullet is influenced by the distribution of the trajectory of the carrier projectile, and the central distribution...
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In order to solve the problems that the timing opening of the carrier projectile for dispersion of the bullet is influenced by the distribution of the trajectory of the carrier projectile, and the central distribution of the bullet cluster is large while the coverage rate of the bullets for the target is low, a method for estimating the trajectory parameters and for controlling the self-adapting of the ejection point based on the GPS positioning is proposed. The status can be predicted by solving the numeric value of the particle motion equation of the projectile; adopting the GPS positioning data as the observed quantity, Kalman filtering trajectory parameter estimation mathematical model is established; at the same time, by distinguishing the abnormal situations of the measurement of the GPS receiver, the reliability of the trajectory parameter estimation is improved. According to the self-adapting opening control flow procedures, a fast algorithm for the prediction of the trajectory and the adjustment quantity of the carrier projectile opening time is designed, so that the load of the missile-borne computer can be reduced. Through the Monte Carlo range test and the semi-physical simulation test, it is proved that this method can effectively reduce the dispersion of the center of the bullet cluster; the error is only 20 percent of that of the timing opening.
Theoretical studies have shown that the use of electrostatic detection device consisting of arrays can the goals of imaging by detecting the objectives of the electrostatic field. In order to use electrostatic field t...
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Theoretical studies have shown that the use of electrostatic detection device consisting of arrays can the goals of imaging by detecting the objectives of the electrostatic field. In order to use electrostatic field theory approach to achieve the target imaging and display the imaging on the screen of the computer. To use the LabVIEW development environment designed the corresponding control system to acquire and process the signals. These signals collection and processing procedures and electrostatic detection device consisting of arrays together constitute the electrostatic imaging system. Experimental results show that the electrostatic imaging system can show objective outline of the image, can identify the explored objectives. The design and research of the electrostatic imaging system for the future of the electrostatic imaging technology for further application laid the foundation.
Aiming at electrode scanning electrostatic detection system, the signal characteristics of the electrostatic detector, such as small amplitude and low frequency, are analyzed. According to the operating principle of l...
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Aiming at electrode scanning electrostatic detection system, the signal characteristics of the electrostatic detector, such as small amplitude and low frequency, are analyzed. According to the operating principle of lock-in amplifier, the application method of lock-in amplifier in the weak signal measurement of electrostatic detector is put forward. The lock-in amplifying process of electrostatic detecting signal is simulated by using a Matlab software, then the lock-in amplifier circuit is designed and simulated in Multisim10. Results show that the broadband noise is rejected, and the signal and noise ratio(SNR) is improved effectively by using the improved lock-in amplifier.
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