Precision spectral analyzers have wide applications in high-speed optical communication, optical fiber sensing, optoelectronic device, laser radar, etc. The developments of precision spectral analysis in recent years are reviewed. At first, the principle and characteristics of Brillouin spectral analyzer based on stimulated Brillouin scattering is focused on, and then, the wavelength and optical power calibration method of Brillouin spectral analyzer is proposed. At last, the precision spectral analysis development in the future is forecasted.

In recent years, the rapid development of optoelectronic technology has propelled the development of electronic warfare to a new stage. The widespread application of new air-to-air missiles poses great challenges to the survival ability of fighters. Airborne throwing active radio frequency decoys are a disposable radar decoy which can simulate the flight and radar characteristics of our own fighters to deceive the radar detection equipments of the enemy and improve our survival probability. Due to its advantages such as small size, light weight and low cost compared with miniature air-launched decoy (MALD), which has attracted widespread attention from various countries.The basic overview and applications of several publicly reported airborne throwing active decoys abroad are introduced, and the development trend is prospected.

Decoy delivery systems are generally installed on the surface of aircraft. For stealth aircraft, the scattering effect at certain polarization and attitude angles of the weak scattering parts such as the decoy delivery system will be very obvious when the main scattering source is effectively suppressed. The radar cross section (RCS)reduction design needs to be carried out for these parts. The radar stealth technology and the development of stealth design of decoy delivery systems on foreign aircraft are introduced to provide references for related technology research.

In recent years, supersonic flow related to supersonic aerocraft has received great attention, and the visualization research on supersonic and hypersonic flow field structure and the accurate measurement of flow field parameters have become the research focus. Compared with traditional measurement technology, optical measurement technology has the advantages of non- interference, high resolution, high precision and visualization, and is widely applied in supersonic flow field measurement. The principles and developments of the optical measurement methods used in supersonic flow field are introduced in detail, which provide references for the development of supersonic flow measurement technology

Optical filter are an important optical device which can filter impurity light interference, and the filters with different wavelength bands are widely used in genetic detection. Based on the theory of film system design and film preparation process, by using the technology of electron- beam evaporation- ion- assisted deposition, with Ta2O5 and SiO2 as the coating materials, a high-transmission long-wavelength pass filter at the cut-off center λ0=520nm high reflection and transmission band λ=530~750 nm on the substrate JGS 1 glass is designed and prepared. By analyzing the membrane layer sensitivity and electric field distribution, a rational crystal control scheme is setted and the process parameters are adjusted to avoid a decrease in the quartz crystal control sensitivity when highly sensitive membrane layers are monitored, thereby, the issue of reduced spectral transmittance is resolved. The prepared filter has 99.77% reflectivity at 520 nm, 98.58% average transmittance in the band of 530~750 nm, which meets the application requirements.

The DSP online upgrade requires multiple power outage and restarts, and in the face of unexpected situations may lead to upgrade failure and cannot return to the original version. The DSP online upgrade method is optimized. The entire upgrade processes don’t require power outage and restarts by joining the external watchdog.The AB zone mode is introduced in the FLASH partition, and the online seamless upgrade of DSP is realized to improve the fault tolerance of the online upgrade. The above optimization is fully verified by experiments, experimental results show that the online seamless upgrade method is easy to operate and has fault tolerance, which can be widely used in the online upgrade of the embedded system.

High speed swept testing system plays an important role in the fields of computing first network, 5Gfront haul network, and a new generation of reconfigure-able optical division multiplexing system, etc. The performance of the whole high speed swept testing system basically depends on the characteristics of the laser. To this end, based on the InGaAsP/InP gain chip’s excellent wide spectrum and Littman-Metcalf external-cavity feedback operating principle, a tunable laser with wide tuning range, high scanning speed and mode-hopping free is designed.In experiment, the maximum scanning speed of 240 nm/s, minimum step trigger interval of 0.001 nm, wavelength stability of better than ±1.3 pm/1 min, absolute wavelength accuracy of less than 2.39 pm, power stability of better than ±0.02 dB/1 min, and single longitudinal mode tunable output of 110 nm with mode-hopping free are realized.This study is helpful to promote the research process of the high speed swept testing system, and boost the testing accuracy and the testing efficiency of wavelength division multiplexing devices.

To meet the requirements of a certain high-speed launching device，the design analysis and optimization is performed to the nonlinear motion guideway of the ammunition chain to ensure the smooth delivery of the projectile to the firing position. The design optimization of the guideway is crucial for ensuring the continuity and reliability of ammunition supply in high-velocity and high-precision launch systems. By establishing the equation of the guideway curve and analyzing the curve characteristics at different positions of the guideway，it is found that the design exhibits flexible impact. Spline interpolation is employed for optimizing the guideway curve，and simulation verification is performed to the optimized guideway，and the simulation result meets the engineering needs. A theoretical basis is provided for improving the dynamic characteristics of the guideway and extending its service life.

A mechanical displacement limit is designed to meet the usage requirements of the electro-optical turntables with an azimuth rotational angle of 0~±180°. Based on the structure, a finite element simulation model is established, and the effectiveness of the mechanical limit finite element simulation model is verified through physical experiments. Combining with the simulation results and experiments, the turntable control program is optimized,and the structure of the displacement limit is improved and enhanced. And the application scenarios are expanded.The displacement limit has the advantages of simple structure and low cost.

Taking the airborne electronic equipment chassis as a carrier, based on specification chassis design requirements, analyzing the design points, integrating chassis design processes, optimizing the structural design of the chassis parts and the selection of unified chassis accessories, the design cycle is shorten and the product quality is improved effectively. So the costs of design and maintenance are reduced to realize the transformation from empirical design to predictive design, and the three modernizations level of the airborne electronic equipment chassis is improved, which provides references for the three modernizations design of the airborne electronic equipment chassis.