According to the development of US Ballistic Missile Defense System （BMDS） and the operational concept of kill chain and kill net， the concept and their closure of the information chain， time chain， energy chain， recognition chain， precision chain within the kill chain of US BMDS are analysed with the typical example of U.S. ground-based midcaurse defense system against the North Korea’s intercontinental ballistic missile attacking American mainland. The kill net and its comprehensive defense capability of ballistic missile defense for American mainland and overseas theater are analysed with the typical examples.

With the rapid development of information equipment， the combat style is also changing and improving， and the cross domain distributed operation through air ground coordination will become inevitable. The air combat platform has the advantages of good mobility， broad vision and strong situational awareness， while the ground defense equipment has the advantages of concealed deployment， wide firepower coverage and strong anti-interference ability. Adopting the distributed coordination mode of air and ground can give full play to their respective advantages， improve the utilization rate of equipment of all services and arms， and achieve greater operational efficiency. In the future， air ground cooperative operations will be characterized by “three-dimensional unity， air to ground coordination， and multiple divisions in one region”。The necessity of cross domain distributed operation through air ground coordination is put forward in this paper for future battlefield characteristics. The characteristics of cross domain distributed defense are given. The shortcomings of the current defense operation architecture are analyzed， and the specific measures of air ground cooperative cross domain distributed defense are analyzed. The key technologies of cross domain distributed defense are summarized and the development suggestions are given.

Live combat training simulates the process of weapon attack and damage based on real military installation. Its essence is multi-platform distributed real-time simulation， and time unity is the primary basis. Based on time unified demand of real combat training， fully considering the training process， information transmission and time basis of platforms， this paper develops time unified technical research. The time unity design is mainly designed from two levels of participation platform time synchronization and training information time alignment， and time consistency verification is carried out periodically to enhance the system robustness and consolidate the foundation of time unity. In this way， the time of whole process and cross-domain multi-platform distributed real combat training can be unified.

In order to make the operational effectiveness evaluation of the electro-optic countermeasure system closer to the actual battle， according to the characteristics of the electro-optic countermeasure system， the impact of tactical application and personnel operation on the combat effectiveness is considered on the traditional ADC model， and an improved ADC model is proposed， and the model is verified by example to be closer to the actual combat situation than the traditional ADC model. The improved model can provide a scientific basis for the evaluation of the combat effectiveness of the electro-optic countermeasure system.

With the appearance of intelligent information warfare， millitary intelligent decision-making has become a key link that can affect the outcome of war. On the basis of analyzing the new characteristics of intelligent decision support system in cloud computing environment， the comparative study of the traditional intelligent decision support system and the artificial neural network system is conducted in this paper respectively. An intelligent decision support system based on the parallel structure of expert system and artificial neural network in cloud computing environment is designed.The operation flow and reasoning process of the intelligent decision support system under the structure are analyzed， which provides a new idea and method for the research of military intelligent decision support system.

In recent years， artificial intelligence technology has been widely used in national defense and other fields， and has achieved relevant breakthroughs. In view of the lack of systematic summary and analysis on the comprehensive application of artificial intelligence technology in shipborne weapon system， based on the full investigation of foreign literature， the application of artificial intelligence technology in the field of detection and identification， command and control and firepower strike in shipborne weapon system is summarized， and insights are presented. The application of artificial intelligence technology in shipborne weapon system is summarized， and the future development trend is proposed in order to provide some reference for the application and development of domestic related technology.

The radar corner reflector play an important role in ship target defense. How to effectively resist the interference of corner reflectorsis a current research challenge. A typical octahedral corner reflector is selected， and the distribution and statistical characteristics of monostatic and bistatic RCS for single corner reflector and corner reflector array are compared and analyzed through electromagnetic calculation and anechoic chamber experiment in spatial domain and polarization domain. The influence of the geometric relationship between bistatic radar and corner reflector on the RCS of the corner reflector is summarized. The results show that the bistatic RCS of the octahedral corner reflector is much smaller than that of monostatic RCS under the condition of large range bistatic angle， and the mean difference is about 30 dB. Reasonable deployment of bistatic radar can reduce the influence of corner reflector interference effectively， which is useful for resisting the interference of corner reflectors through bistatic radar.

Aiming at the problem that existing deinterleaving algorithms' accuracy and efficiency decrease in a complex electromagnetic environment， a dynamic histogram deinterleaving method is proposed based on correlated pulse pairs. The process firstly performs fixed box length statistics on the difference of TOA（time of arrival）. It merges adjacent boxes higher than the detection threshold to obtain dynamic histogram statistics and estimate the potential PRI（pulse repetition interval）. By analyzing correlation pulse pairs corresponding to the potential PRI， the false PRI is eliminated， and the amount of jitter of the real PRI is estimated. Finally， the pulse sequence search is completed according to the PRI parameters to realize the deinterleaving of radar signals. Simulation experiments show that the method can achieve 95% accuracy in deinterleaving multiple complex PRI modulated signals under a lower depth and the technique can effectively deinterleave radar signals in a complex electromagnetic environment.

Patrol duty is a security and stability maintenance operation of great significance， but the patrol environment is complex， the object are diverse， and the problem of difficult detection is very prominent， so how to accurately and real-time detect patrol duty objects is of great practical significance.In order to improve the accuracy and real-time detection of patrol duty objects， the YOLOv5 algorithm is improved. In order to suppress the interference caused by the patrol environment， the ECA-Net attention mechanism is combined to improve the saliency of the detected object； and the introduction of BiFPN structure ensures better real-time performance and multi-scale object detection capabilities of the algorithm.Comparing the improved algorithm with the original algorithm， the mAP is improved by 3.51% ； comparing with four algorithms， the results show that the algorithm can better reduce the impact of patrol object detection of due to the problems of similar detection，diverse scales and light interference， which further verifies the effectiveness of the proposed algorithm in the task of patrol duty object detection.

With the continuous improvement of war informatization， systematization and intelligence， the demand of military users for missile equipment support has changed from post maintenance and regular maintenance to condition-based maintenance and intelligent support， which puts forward higher requirements for missile equipment health management. Through the demand analysis of missile equipment health management system， this paper puts forward the overall system architecture for missile equipment support， the system physical architecture for complex application scenarios in military plants and the system technical architecture based on micro-service， and carries out the system function modules by using structural design method， describes the key technologies of the system， constructes and applies the first phase of the system for the pilot equipment. The application results show the feasibility of this study， which can provide reference for the health management of other types of equipment.

For the actual evaluation of the synthetic brigade equipment support capability， considering the fuzziness and randomness of the standard interval of index grade in the evaluation， a synthetic brigade equipment support capability evaluation model based on extension cloud is proposed. The evaluation index system of synthetic brigade equipment support capability is constructed through the systematic analysis of synthetic brigade equipment support task. The weight of each evaluation index is determined by the comprehensive weighting method combining AHP and Entropy method. Considering the advantages of qualitative and quantitative analysis of matter-element model and the characteristics of uncertainty reasoning of cloud assessment model， the extension cloud model of synthetic brigade equipment support capability assessment is constructed， and the confidence information of assessment results is given， the extended cloud model of synthetic brigade equipment support capability evaluation is constructed， and the confidence information of evaluation results is given. The method is proved to be scientific and effective by an example.

As a new combat force， the army synthetic brigade has many types of equipment， high degree of integration， and complex support problems. It has higher and higher requirements for "accurate support" of equipment. The digital twin technology is introduced into the field of equipment support. Through the analysis of the research object， the connotation and extension of the research system are outlined， and the operation law of the system is mastered. By constructing the framework of digital twin model， the structure of the digital twin model is described from the five dimensions of physical dimension， twin dimension， data dimension， application dimension and connection dimension， the key technologies for the establishment of each dimension of the model are clarified， the application assumption of the model is explored， and finally the digital twin model of the typical equipment support system of the army synthetic brigade is constructed to solve the complex problems faced by the equipment support of the army synthetic brigade. It provides a method reference for the realization of the goal of "accurate support" of equipment.

In view of the safety accidents when the ammunition itself is attacked by the enemy or improperly operated and the safety problems of high-value weapon platform ammunition， through a large number of data research， on the basis of summarizing and analyzing the research progress of ammunition safety problems in western military powers， the types of assessment tests and the related research carried out by domestic scholars， combined with the shooting range test， eight kinds of test assessment methods for the safety test of the tested ammunition are put forward， including safety drop， bullet attack， fragment impact， liquid fuel/external fire， slow heating， symppathetic reaction， shaped charge jet and braking of rocket sled. The corresponding assessment requirements and evaluation methods are given for the reaction types and reaction levels of the tested ammunition after stimulation. Some suggestions are put forward for the research on ammunition safety in China.

Thermal battery usually has two types of activation： no-load activation and on-load activation. At present， the thermal battery with load activation is a common activation mode in flight test. The internal resistance changes rapidly from large to small in a short time when it is activated.and the effect of this change on the system power supply has not been reported.. This paper introduces the basic characteristics and working principle of the thermal battery， focusing on the activation mechanism and the possible impact on the system power supply. The resulting problems of system power supply in the test are analyzed and summarized， and several referenceable solutions are provided， which are simple， effective and easy to implement in engineering.

In order to reduce high lift system design errors, avoid physical verification and iteration, accelerate the development progress, this paper proposes a model-based system requirements validation and verification technology throughout the development stages of the whole life cycle including joint definition, preliminary design, detailed design and integrated verification. This technology integrates Simulink and SCADE models into a unified virtual integration platform through ADS2 software. The system architecture model and system performance model are respectively created and simulated based on this platform, which realizes the validation and verification of system requirement at different stages of research and development. In addition, using ADS2-enabled I/O driver modules, reusing test cases and user interfaces established during the design phase, a computer-in-the-loop semi-physical integration environment, control subsystem integration environment and a fully physical integration verification environment can be quickly built to support hierarchical verification of system requirements. Because unified models and test cases are used at various stages of R&D to convey information, which ensures consistency of information transmission during R&D, greatly reduces design errors, accelerates the R&D cycle, and reduces R&D costs.

In order to study the motion law of ballistic missile and decoy， the flight program of ballistic missile in the active phase is designed in three steps. According to the force condition of ballistic missile in different motion stages， fully considering the factors such as atmospheric resistance and perturbation force， the full ballistic motion model including the active phase， free flight phase and reentry phase of ballistic missile is constructed in the geocentric inertial coordinate system， and the decoy release process of ballistic missile is modeled， and the motion equations of ballistic missile warhead and bait are established. The model is used to simulate the ballistic missile with four decoys and two-stage rocket boost， and the variation laws of the flight height， velocity， inclination and acceleration of the ballistic missile warhead and decoy with time are analyzed. The simulation results show that the model can fully and accurately reflect the motion characteristics of ballistic missile in several different motion stages.

In order to improve the support efficiency of spare parts for training equipment of space test forces， based on the idea of aerospace civil-military integration， an inventory model of spare parts for training equipment of space test forces based on information sharing and cross-level direct supply is proposed， and the existing spare parts inventory process is optimized to some extent. General to both is regarded as a system for the overall modeling， publishes a win-win goal， combined with the case fusion system dynamics simulation method，the current inventory model and the model proposed in this paper are simulated and analyzed. The results show that the inventory model established in this paper can effectively reduce the delay time of spare parts support and reduce the excessive production and storage of suppliers.It can achieve a win-win situation for both military and civilian in terms of improving spare parts support efficiency and reducing economic cost， and provide reference for improving spare parts support capability of training equipment of space test forces and promoting training level.