A reliable remote upgrade scheme is designed through the in application programming (IAP) of GD32. Under the condition of the existing communication interface, it is unnecessary to operate the BOOT signal of the microprocessor and connect the cable to upgrade the application program of GD32 microprocessor. Under the condition of ensuring the success and reliability of the upgrade, the scheme greatly saves the labor cost and time cost caused by dismantling the upgrade cable in the past, which has a great reference value for the remote online upgrade of multiple embedded-systems equipment.

With the development of solid-state laser and the chirped pulse amplification technology, the laser peak power has been greatly increased, which has promoted the research of laser matter interaction and derived applications with good prospects. Compact laser-driven ion accelerators are one of the most important applications. The laser accelerated proton has the characteristics of small source volume, short pulse time and high time resolution, which can be widely used in proton imaging, medical treatment and scientific research fields, and can effectively reduce the related costs in these fields, and promote the efficient development. There are many conditions that affect the obtaining of high-quality ion beam, some recent advances in this field are summarized and prospected from the perspective of target shape and the properties of plasma formed after laser interaction.

Unmanned aerial vehicle (UAV) has good stealth characteristics, strong penetration ability, low acquisition cost and flexible use, which is used by criminals or terrorists organizations to perform intelligence collection and ground attack tasks. Especially in urban environment, the effect is far better than that of traditional ground attack methods. This kind of asymmetric attack may have a huge negative impact on social security and stability, national economic development and military strength construction. Small UAV has become a new threat to safeguard national interests. The main characteristics of current small UAV is analyzed, combined with the typical threat cases of small UAV in recent years, the development ideas of future anti UAV electro-optical technology is proposed.

The design method of flexible infrared optical imaging system based on optical fiber transmission is discussed. The split layout of optical imaging front module, optical fiber image beam and optical imaging rear module is used to achieve efficient matching of optical aperture and refrigeration detector through reasonable optimization design. The design method effectively reduces the optical load quality of the servo rotating structure, compresses the shape and size of the optical load, and effectively expands the new way of flexible layout of the optical machine system. Through the design method, with the servo rotation structure, arbitrary direction imaging in the hemispheric airspace can be realized.

The traditional laser warning testing system has the problem of low testing efficiency during the testing and calibration process. The main reason of the low efficiency is that much time is spent on some tasks such as the setup of environment condition required by the testing and the change of testing condition in mid-way. According to the problem, a testing system for laser warning unit compensation calibration is proposed. The device controls the pneumatic mechanism through LabWindows and CVI, changes the testing conditions according to the testing requirements. It controls the laser to emit continuous pulse signals simultaneously, and communicates to, receives and uplinks information to realize automatic compensation calibration of the laser warning unit. The testing system can effectively improve the calibration efficiency and testing safety of the laser warning unit.

Compared with a U-type electro-optical turntable, T-type turntable is characterized by lower height and lighter weight. However, it is difficult to design the controller due to unbalanced load. The design and optimization of a T-type turntable compound axis system is introduced. The proportional integral (PI) and lead algorithm is used in the turntable speed loop to increase the crossover frequency and improve the dynamic performance of the system. Simultaneously, it can perform real-time dynamic compensation to periodic low-frequency disturbance to reduce the impact of disturbance on error. The small error range of the position loop is corrected in series with PI and multiple lag links, and the low-frequency gain is improved. And the compound axis control method of the T-type turntable is analyzed, which is simulated and verified in high-precision tracking and pointing system. At last, the T-type turntable is used in an electro-optical tracking and pointing turntable, and the tracking accuracy is better than 10 μrad root mean square (RMS).

Fiber coupler is widely used in optical fiber communication, laser detection, electro-optical transmission and other systems because of its many advantages. With the improvement of the performances of optical systems, higher requirements are put forward for the analysis of the influence of fiber coupler on the performances of optical systems. The influence of different input wavelength on the output splitting ratio of 1×2 fiber coupler is researched and analyzed. At the same time, by testing extinction ratio and one hour output power stability of the optical system, the influence of ordinary, polarization maintaining and single polarization 1×2 fiber coupler on the performance of optical system is compared and analyzed. The results can be used to guide the application of fiber coupler in high-performance optical engineering system.

Beat length is an important parameter to characterize the performance of polarization maintaining fiber, with the widely application of polarization maintaining fiber in the field of fiber communication and sensing, it is very important for the high accuracy measurement of beat length. Based on the white light interferometry, a beat length measuring device of polarization maintaining fiber is developed. Beat length is calculated by measuring the geometric length between the two stress points on the polarization maintaining fiber and the optical length between the corresponding coupling points. Geometric length is accurately measured by laser interferometer, and the measurement of optical length is firstly by using Hilbert transformation and polynomial fitting to extract white light interference envelope signal, obtain the precise peak position of the polarization coupling point, and then, the frequency stabilization interferometry is used to measure the optical length between the coupling points. The experimental measurement results and uncertainty analysis indicate that the measurement repeatability is better than 4 μm, and the measurement uncertainty is 20 μm.

In order to enhance the robustness and segmentation performance of the fuzzy local information C-means clustering algorithm, a fuzzy local information C-means clustering algorithm based on feature selection is proposed. Based on the existing fuzzy local information C-means clustering algorithm, the local neighborhood constraints of the target function are added with neighborhood membership constraint, and the idea of feature selection is introduced to the target function. KL-divergence is taken as regularization factor to obtain a new robust fuzzy clustering algorithm. The local median filter is applied to the membership degree of each pixel in the end of the proposed algorithm iteration, and then the maximum membership criterion is used to realize the pixel classification, so as to obtain the final segmentation result. Experimental results show that the proposed algorithm has better segmentation performance and anti-noise robustness than that of the existing fuzzy local information C-means (FLICM) algorithm.

According to the problems of joint test action group (JTAG) being not used during on-orbit satellite controller reconstruction and being difficult to update DSP program due to the limitation of working environment, taking digital signal processing (DSP) TMS320F28335 as an example, a scheme of online reconstruction DSP controller through serial port is proposed. Because the DSP controller may be knocked over by a single particle while the satellite is in orbit, a method of redundancy of the master control program and periodic or instruction reconstruction of the master program to reduce the possibility of invalid of the controller due to the flip of the single particle is proposed. Experimental results show that the method is simple and suitable, stable and reliable operation, and easy to operate, which can realize the reconstruction program of DSP TMS320F28335 take over the controller after power on, solve the problem of reconstruction of DSP in orbit, and greatly reduce the possibility of being knocked over by single particle. It can be applied to the commercial aerospace embedded field.

As an important means of jamming infrared guided missile, the jamming effects of the point source infrared decoy are related to many factors. It is very important for operation to study the motion characteristics of the infrared decoy after being dispensed. Through establishing the motion models of the point source infrared decoy, three kinds of dispensing modes such as upward, downward and lateral are simulated respectively. And the separation situation of the aircraft and the point source decoy at different viewing angle is obtained.

As a common passive jamming mode, smoke screen has a direct impact on combat effectiveness. The jamming principle of smoke screen is introduced, the relationship between the shading effect and the launching speed, launching angle and fuse time of the smoke screen grenade are described, and the influence of the three parameters on the shading effect is analyzed. Simulation results show that the smoke screen shading effect is the best when the firing speed is the maximum, the launching angle and the fuse time are the appropriate values during the adjustable range of parameters. And the conclusion is helpful for practical application.

The scheme of generating optical frequency combs by cascading M-Z modulator (MZM) and phase modulator (PM) is researched, and an optical fiber link is built on the theoretical basis for experimental verification, which can produce optical frequency combs with a signal-to-noise ratio of about 35 dBm, a flatness of 4.5 dBm and about 22 comb teeth at most. The feasibility of the scheme is verified by researching on the change of spectrogram at different frequencies and powers in experiments.

Visualization technology of assembly process based on model-driven plays an important role in improving process efficiency. The evaluation, simulation and optimization of assembly design of complex photoelectric products are focused on. Combined with the establishment of product model base and assembly design process knowledge base, the product integrated assembly information model is constructed. Furthermore, a comprehensive evaluation and analysis system of assembly complexity is constructed to optimize the assembly process based on soft computing method. And the 3D assembly simulation environment based on virtual reality is built to realize the product assembly simulation.

In the process of using the fast steering mirror (FSM) which corrects the laser beam, the residual beam irradiates the FSM base structure and causes deformation, which may have adverse effects on the system, a targeted research has been carried out on the design of FSM base structure. The material selection and structure layout of the FSM base structure is analyzed in detail, and the aluminum base structure is chosen. The hollow-carved design method is adopted in the densest beam in the middle of the base, and the design direction of SiC material base is proposed. Thermal analysis and calculation are performed to the hollow-carved FSM base structure, the feasibility of the design method is verified and a new design idea for the structure design of similar FSM base structure is provided.

One pushing device requires high load and space ratio. Steel belt transmission technology is researched deeply, and a scheme to solve perforated steel belts is proposed. Based on the principle of perforated steel belt, the realization of the transmission system, the strength and life of the steel belt and the tensing of the steel belt, work has been carried out to complete the assembly and debugging of the device. Results show that the synchronized pushing device based on perforated steel belt works stably and has reliable performance, which have a broad application prospects.

Aiming at the vibration fatigue characteristics of electronic equipments, a random load process based on frequency analysis method is proposed. At first, the frequency dynamic response characteristics of the structure are calculated. And then, the fatigue damage model of the electronic equipment is established combining with the three interval method proposed by Steinberg. The fatigue life of the vulnerable parts of the electronic equipment is simulated and analyzed by using the finite element method, and the cumulative damage value of the vulnerable parts of the electronic equipment is calculated. The research results have certain reference and guiding significance for the design and development of electronic equipments.