Combined with the development trend of vehicle networking, an adaptive front lighting system (AFS) for automobile based on vehicle on-board diagnostic (OBD) interface is proposed, which can overcome the problems existing in the traditional scheme of vehicle data acquisition by means of external sensors, such as multi-sensors, high cost and installation inconvenience. The main features of the system is that it can realize the adaptive analysis of the vehicle bus protocol, and read the driving information such as the vehicle speed and the steering wheel angle required by the adaptive lighting system through the vehicle OBD interface. Simultaneously, the prototype test results show that the average error between the theoretical corner angle of the headlamp and the actual corner is less than 5%, which meets the system function requirements.

The development status of the infrared polarization imaging system in China and foreign countries is analyzed. According to the application needs of medium wave infrared (MWIR) polarization imaging, a MWIR polarization co-aperture imaging system is proposed. The system is composed of the front co-aperture and the rear sub-aperture imaging systems. The rear sub-aperture imaging system includes four polarization channels which adopts different polarization components, thus full polarization imaging is realized in the system. According to the used detectors, the analysis and design of the system is completed. After the design, the modulation transfer function (MTF) of the system is more than 0.3@17 lp/mm. The maximum root mean square (RMS) spot diameter is less than the size of the detector pixel and a single pixel energy concentration rate is greater than 80%.

The design of the controller is one of the cores of the precision tracking algorithm. In order to meet the requirements of tracking precision, a complex control system based on the target state estimation is constructed. The ideal position loop model is constructed based on the characteristics of the system frequency. The influence of the mid-band height and width on the dynamic performance of the system is also analyzed. On the premise of satisfying a certain phase angle margin, the approximate formula of resonance peak [Mr] and mid-band width H are deduced, and the parameters of lag-lead controller are determined. The bilinear transformation is used to achieve the digitalization of the controller, which is convenient for the simplification of the engineering operation. It is verified by practical systems, and better effect is got.

An optical beam forming network with wavelength routing for delay scanning is introduced. The beam forming network has many advantages such as large processing bandwidth, good electromagnetic compatibility, low transmission loss and strong multi-beam capability. According to the principle block diagram of simultaneous optical multi-beam network, the principle prototype is built and the performance index is tested. The results show that the beam forming network can form multiple beams at the same time and has good broadband performance.

Barium-Ferrite is one of the common used Ferrite material for it’s high saturation magnetization, coercivity and resistivity, which has a widely application in microwave absorption. Tombarthite-substituted modification of the Barium-Ferrite is the main research direction. M hexa-Barium-Ferrite nano-particles are synthesized by co-precipitation method. The structure and electromagnetic properties of the results is analyzed by X-ray powder diffraction (XRD) and vibrating sample magnetometer (VSM). The vector network analyzer is used to analyze the absorbing properties of the pure and tombarthite-substituted Barium-Ferrite. The results show that the absorbing property of tombarthite-substituted Barium-Ferrite is improved further.

Optical guidance means is used to guide the landing boat to enter the well-dock at night effectively and quickly. According to the rectangular light field shaping method with small divergence angles, the light emitting diode (LED) guiding source with 2.3°×1.15° full width at half maximum is designed. An optical alignment method based on guiding light source colors or flicker frequency is put forward. Based on the guidance system strategy, five LED guiding sources with different colors or flicker frequencies are manufactured and the system prototype is built. Experimental results show that the prototype can effectively realize the alignment function of the landing boat optical guidance system.

According to the problem of image similarity comparison, an image similarity comparison method based on data field clustering is proposed. In the method, at first, image information is converted from RGB color model to HSV color model. And then, each pixel point is projected into the HSV 3D space, the main color is extracted through data field clustering algorithm. At last, image similarity judgment is performed according to the main colors of the two pictures. Experimental results show that the algorithm has better similarity judgment effect.

There are many kinds of optimization algorithms and they have widely application. It is of great significance to select suitable optimization algorithms when solving complex problems such as global large-scale combinatorial optimization. The application of simulated annealing algorithm in solving the shortest path problem of aircraft cruise is mainly analyzed. And it is compared with genetic algorithm and improved genetic algorithm. The conclusion shows that simulated annealing algorithm has the shortest path in the application of the shortest path, and has better solution results than other two optimization algorithms. Therefore, simulated annealing algorithm plays an important role in solving complex global optimization problems.

Discrete wavelet transform is not only better suited to the characteristics of human visual system, but also better adapted to JPEG2000 and MPEG4 compression standards. The carrier image obtained by embedding watermarking information into the carrier image by wavelet transform has good visual effect for human eyes, and the watermarking information in the carrier image has strong resistance, so the research of the digital watermarking technology based on wavelet is of great significance to current situation. Using a digital watermarking technology based on wavelet transform, the low-frequency subgraph is divided into blocks and its wavelet coefficients are quantified. The Arnold scrambling algorithm is used to embed the watermarking into the target image and extract the watermarking completely from the target image. And the robustness of the Arnold scrambling algorithm in the wavelet transform is demonstrated by common watermarking attacking on the watermarking information.

Coarse wavelength division multiplexing (CWDM) is a low cost and high reliability communication technology, which is widely used in broadband metropolitan area network. Based on CWDM technology, an optical transceiver module with the speed of 100 Gbps and according with the industry standards is developed. QSFP28 packaging is adopted, and the transmitting and receiving performances of the module are tested and optimized. After testing, the transmitting eye map meets the needs of 30% margin, the receiving sensitivity is less than -10 dBm, which can meet the requirements of high rate data communication system.

A traffic light simulation system based on 51 single chip micro-computer is introduced. The circuit is described from two aspects such as hardware circuit and software program designs. Hardware circuits are also described from the functions of clock circuits, reset circuits, power supply circuits, LED display circuits and digital tube countdown circuits. When the software program is written, the circuit is debugged with the actual traffic light requirements, and the expected effect is achieved. Prior to the design of the circuit, Protues simulation software and Keil software are used for joint modulation, and the feasibility of the circuit is verified and the working efficiency is greatly improved.

According to the power supply demand of a ground sampling equipment, an isolated single-power DC-DC module DPBL16-W24S5 and DPE75-24S12 chip are used to design a secondary power supply that converts the external power supply voltage of 27 V into 5 V and 12 V respectively and solve the problem of power supply voltage mismatch. The hardware circuit of power supply conversion is designed. Printed circuit board (PCB) design is conducted with Altium Designer software, which has higher anti-interference performance. And the output voltage is measured and the test results are summarized and analyzed. The circuit test results show that the power supply conversion circuit has stable output voltage and voltage stabilization precision.

A temperature adaptive tunable optical attenuator control method is designed. Based on the temperature characteristic curve of the tunable optical attenuator under different temperature, a temperature adaptive control method is proposed. The control precision of the tunable optical attenuator is improved when the temperature range is large. Testing results show that the control precision of the attenuator is improved, and the temperature ranges is from -25 ℃ to 75 ℃, the attenuation error is less than 0.1 dB.

The thermal characteristics of machine tool spindle system are one of the main factors affecting its processing accuracy, so it is particularly important to analyze the thermal characteristics of the spindle system. Taking TPX6111E/3 numerical control (NC) boring machine as the research object, using FLIR thermal imager and Iridium laser triangulation measurement system, the thermal deformation of NC boring machine with the same speed in different seasons is analyzed. Experimental results show that the ambient temperature varies greatly depending on the season or time. The temperature values of the corresponding points of the spindle of the same NC boring machine at the same speed are quite different. The thermal deformations of the spindle in X and Y directions are also different, and higher requirements are put forward for the working conditions of the spindle in the process of processing.

Taking the six-wheeled-legged compound mobile platform as the research object, using virtual prototype technology to simulate the mobile platform running on the rugged road surface, and draws the conclusion that the stability of the platform is insufficient in the movement. In order to improve the overall stability, the torsion bar spring is optimized and improved, so that the performance of the platform can reach the best state. The final optimization results can provide references for the industry production and improvement.

Research on laser atmospheric transmission effect is always important in laser application. Numerical simulation is a common method to research on atmospheric turbulence effect. Based on power spectrum inversion method, numerical simulation of wave front phase screen by Kolmogonov atmospheric turbulence is implemented. Research results show that on the basis of the phase screen generated by power spectrum inversion method, the atmospheric turbulence effect can be better simulated by the low frequency part being compensated by sub-harmonic.