Detection of laser beam riding guidance information field is an important method to guarantee the normal operation of the laser beam riding guidance instrument. According to the time and frequency distribution characteristics of laser beam riding guidance signals, the short time Fourier transform (STFT) with the analysis ability of time and frequency characteristics is adopted to analyze the time and frequency characteristics of laser signals simultaneously. Experimental results show that STFT can easily obtain the time and frequency characteristics of laser beam riding guidance signals, which is an efficient detection technology of laser beam riding guidance information field.

At first, the military requirements of shipborne laser passive reconnaissance and location technology are summarized. And then, the technical characteristics of laser sources in sea battlefield are analyzed. The principle of passive direction finding cross-locating is introduced and the simulation model is established. The simulation calculation of measurement subset (φ1, ε1, φ2) is performed to obtain laser passive location distance and error data, the correlation information of location distance, single station direction finding accuracy, baseline length and station distribution strategy. At last, the applications of laser passive location engineering are put forward, which has better guidance for the engineering realization of the shipborne laser passive reconnaissance and location.

The traditional line structured light underwater three-dimensional (3D) imaging system cannot consider underwater color calibration and height calibration at the same time, so the color distortion and low precision are the big problems to underwater target. A high precision color 3D data acquisition system for underwater target is designed, which integrates color calibration and height calibration. Red green blue (RGB) laser form a long line light source to realize the synchronous acquisition of target color data by field of view (FOV) fusion. The color calibration board and the height calibrating ruler are integrated in the calibration module, and are connected through a tele- scopic prop to make the equipment miniaturized. Under the control of the rotating motor, the imaging equipment can achieve 0°, 90°, 270° direction data acquisition and 180° direction color and height calibration. The system has the advantages of easy implementation, simple operation, synchronous calibration and good platform adaptability, which play an important role in the development of high color fidelity and high precision underwater targets 3D stereo- scopic detection.

The software and hardware design of a new intelligent optical fiber circumference alarm system is introduced in detail. The composition of the related hardware, the main points of selection and design of components are presented. The optical fiber vibration sensing, wireless networking, mobile terminals and other technologies are adopted to create a new intelligent circumference prevention and control system. The design process, simulation and experimental results of the optical fiber weak vibration detection algorithm are described in detail. The results show that the system can detect and alarm the intrusion targets well and meet the design requirements.

A moving object detection algorithm based on attitude information is proposed to solve the problem of high false alarm rate and low real-time for airborne electro-optic detection equipments for moving object detection in ground background. At first, the suspected target points in images are extracted. And then, the position of suspected target points in images and the attitude information of airborne equipments are used to calculate the position of the target in the inertial navigation coordinate system. According to the change of target position in the inertial navigation coordinate system, the suspected targets are divided into a background target and an alternative target. At last, whether the alternative target is moving or not is determined through calculating the angle relationship change of the alternative target and the background target. The algorithm is verified by the simulation.

A general method on the properties of non-uniform gas such as absorption and emission by spectrum data of interested molecules from HITRAN 2004 is provided. Based on this and atmospheric layering data, the transmissivity of infrared waveband through atmospheric path is calculated. The method is also applied to calculate the properties of plume of aircraft or other gases.

Based on the limitation of the laser imaging effect on an imaging system, a simulation method using full digital simulation technology is presented for the first time. At first, the laser imaging effect on the imaging system is analyzed and researched from three aspects such as laser effect on a detector, laser atmosphere transmission and laser effect image overlapping, and based on which, the simulation design of the laser effect is performed. The simulation of the effect is designed and a simulation system based on RTI bus is developed. And continuous dynamic simulation effect images are given under different conditions. At last, the application and the development of the simulation system are put forward.

A new positive intrinsic-negative (PIN) phototube is introduced. For the different operation characteristics of the PIN phototube at different conditions, through software simulation and analysis, the variance of the phototube operation characteristics is proposed. Experimental modules are presented to test the variance of the operation voltage, current and the characteristics of the phototube under different illumination conditions. The cause of the characteristic variance is analyzed, and the best operation method of the phototube is proposed, which has certain references in application.

The traditional weak laser coding signal generator has some problems such as large size and poor coding accuracy. A design of hand-held weak laser coding signal generator based on STC15W408AS microcontroller is presented. It solved the problem of the poor timing precision of the traditional microcontroller timer, which requiring high speed complex programmable logic device (CPLD) to assist design. A programmable counter array (PCA) timer mode is used to improve the pulse timing accuracy of the microcontroller to sub-microsecond. The whole machine adopts a single +3.7 V power supply scheme, which can be controlled by buttons or WiFi, with advantages of low power consumption, high precision timing signal and easy to carry and operate.

The burning spectra of Mg/Sr(NO3)2 and Mg/Ba(NO3)2 compositions are tested respectively to obtain the burning spectrum distribution maps with the whole-band radiometer for analyzing the distributions of burning spectrum. It can be concluded that the total radiant energy of 620~760 nm is 80.59% in Mg/Sr(NO3)2 composition burning spectrum through researching burning spectrum. And in Mg/Ba(NO3)2 composition burning spectrum, the total radiant energy of 500~578 nm is 21.15%, 578~592 nm is 3.30% and 620~760 nm is 60.41%. Combining the burning spectrum with the derivative spectrum is served as a means of identifying both types of compositions.

Objects and basic principles of heat control design are introduced. The heat control methods such as the natural cooling design methods for component location, heat shield, module natural heat radiation are introduced in detail. And examples are described with applications. The flow of heat analysis and notices are given. The effective experimental methods are proposed for heat tests. The reviews and advices for enhancing effectively the heat design level are given.

From the perspective of structural design, the design points of electromagnetic shielding for electronic cases are described. And the design method of electromagnetic shielding in structural design is presented. The Ansoft HFSS software is applied to simulate the case of an electronic equipment. And the distribution of the inner field of the case and shielding effectiveness of electronic equipment case are calculated. Through optimizing the layout of the device and the reasonable design of the case plate board, the purpose of improving the electromagnetic shielding effectiveness is achieved.

Laser cleaning technology is a new rapidly developing cleaning technology in recent ten years. With its advantages, it has gradually replaced traditional cleaning technologies in many fields. The pulsed Nd:YAG laser cleaning process depends on laser pulse characteristics generated by lasers. Based on the photophysical reaction caused by the interaction among high intensity beam, short pulse laser and pollution layers, the basic principle and classification of Nd:YAG laser are introduced, and the principle of laser cleaning is imposed. The Nd:YAG laser cleaning experiment is also introduced. Experimental results show that Nd:YAG laser cleaning has good effect on cleaning the surface of smooth substrate, which is a developing direction of cleaning technology in the future.

The roundness measurement of large circular parts is mainly made by manual contact measurement, which is less efficient. For the disadvantage of contact measurement, the non-contact measurement technology based on machine vision is used to study the roundness measurement of large ring parts without direct contact with the parts to be measured, and the data of roundness and concentricity can be obtained by fitting the partial circular image of parts. At first, preprocessing the acquired image, and aiming at the influence of the noise and other factors, the bilateral denoising algorithm with the best processing effect is selected. And then, based on the traditional Canny edge detection, an improved Canny adaptive edge detection algorithm is developed for edge detection and contour extraction. At last, in the image fitting link, based on the traditional least squares fitting algorithm, the least squares iterative fitting algorithm is used to fit the partial arc of large circular parts, and the validity and superiority of the algorithm are validated. The measuring method is convenient and reliable, which improves the detection efficiency, and can quickly measure the size of the part within the allowable error.

Based on the study of the concept and connotation of prognostics and health management (PHM), the basis of the airborne module build in test (BIT) design and the fault diagnosis system is analyzed. Based on the airborne module and the ground fault inspection system, the detailed frame of the airborne module BIT design and the fault diagnosis system is put forward. Through analysis, summary and simulating, the fault prediction model design idea on the basis of PHM is presented. With airborne module BIT design, fault diagnosis method and process, the theoretical support is provided for on line test, production testability and maintainability of the airborne module.