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    A Review of Air Target Operational Intention Recognition Research
    Chenhao ZHANG, Yan ZHOU, Yichao CAI, Jiaqi GUO
    Modern Defense Technology    2024, 52 (4): 1-15.   DOI: 10.3969/j.issn.1009-086x.2024.04.001
    Abstract (11194)   HTML (3901)    PDF(pc) (762KB)(7102)       Save

    With the continuous evolution of war forms and the upgrading of weapons and equipment, the air battlefield situation is becoming more and more complex. Quickly and accurately identifying the combat intention of the target is an important content of battlefield situation assessment, which can provide auxiliary information for commanders to make decisions and help them to seize the initiative in the war. This paper firstly introduces the basic concepts and related models of target intention recognition, defines the concepts of target intention and intention recognition, and determines the status and importance of target intention recognition from two aspects of the operational command decision-making process and information fusion process. Secondly, target features and intention space, as input attributes and recognition framework for intention recognition respectively, are the basis of intention recognition and are reviewed. Then, five common target intention recognition methods such as rule and template matching, evidence theory, Bayesian network, traditional machine learning and neural network are reviewed. The basic mechanism and recognition process of each recognition method are introduced, and its advantages and disadvantages are summarized. Finally, the performance of five kinds of target combat intention recognition methods is compared and analyzed, and the future research direction is prospected.

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    Research on Detection Methods for Countering Small and Micro Rotary-Wing UAVs at Surface-to-Air Missile Sites
    Shisheng YU, Ke WANG, Yu SUN, Jinghua NIU
    Modern Defense Technology    2026, 54 (3): 60-70.   DOI: 10.3969/j.issn.1009-086x.2026.03.006
    Abstract (10472)   HTML (462)    PDF(pc) (5358KB)(3133)       Save

    This paper aims to study the problems exposed during the Russia-Ukraine conflict, such as the close-range blind area of radar monitoring, difficulty in detecting small multi-rotor unmanned aerial vehicles (UAVs) within 5 km around the position, and vulnerability of the self-defense capability of surface-to-air missile positions when coping with penetration reconnaissance and fire attack guidance by small multi-rotor UAVs. Methods Three types of signals emitted by small multi-rotor UAVs are collected. FEKO software is adopted to simulate radar cross-section (RCS) patterns of UAVs under radar operation in different frequency bands. The time-frequency domain characteristics of the signals are analyzed, and the feasibility of employing these characteristics for effective detection is demonstrated. Results The adopted software defined radio (SDR) equipment can successfully intercept and identify the video transmission signals at distances of 100.33 m and 70.129 m from UAVs. By employing the azimuth information provided by SDR, the guidance radar can rapidly detect and track UAVs, which saves 9 min compared with the full-airspace independent search mode of the guidance radar alone, thus verifying the feasibility and practicability of the proposed method. Conclusion By carrying out analysis and verification, a detection method combining radio frequency (RF) signal monitoring and precise radar positioning is proposed. Real-flight UAV tests are conducted, and SDR equipment is employed for RF signal detection, identification, and bistatic direction finding. The guidance radar utilizes the directional information provided by SDR to achieve precise positioning and tracking of UAVs.

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    Development and Testing of Multi Rotor Unmanned Aerial Vehicle Noise Source Tracking and Positioning System
    Jingyu HE, Jizheng LIU, Zhichen YANG, Dongdong WANG, Ping OU
    Modern Defense Technology    2024, 52 (3): 1-8.   DOI: 10.3969/j.issn.1009-086x.2024.03.001
    Abstract (9622)   HTML (3224)    PDF(pc) (3666KB)(5699)       Save

    Multi-rotor drones are increasingly becoming a threat to critical facilities while bringing convenience. This article focuses on the difficulty of tracking and detecting low slow small unmanned aerial vehicles (UAVs), and develops a UAV tracking, detection, recognition, and positioning system based on microphone array sound source localization. The system acquires UAV noise signals in real time, and then uses a wavelet transform-based beamforming time-frequency sound source localization algorithm for UAV noise source localization, and finally integrates the position of the multi-rotor UAV obtained by inversion of the microphone array and the image captured by the video. Tests conducted in a fully anechoic room have shown that the positioning system can accurately track the lateral flight and up-and-down flight of drones, accurately detect the position of drones even in blind spots of cameras, and effectively compensate for video detection. And the positioning accuracy of the system is 92.2%, which is better than that of similar systems.

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    Review of Technological Development and Trends of Foreign Shipboard Missile Launchers
    Qiang GUO, Zhiyan ZHANG, Jian LI, Huiguo QIN, Xueming PENG
    Modern Defense Technology    2026, 54 (2): 1-12.   DOI: 10.3969/j.issn.1009-086x.2026.02.001
    Abstract (8554)   HTML (2235)    PDF(pc) (5804KB)(21588)       Save

    Shipboard missile launching systems have become the primary weaponry systems for modern naval vessels. Their technological level, structural configuration, and production costs directly impact the operational effectiveness, technical performance, and combat paradigms of entire shipborne systems. This paper presents the evolutionary process of technological iterations in international shipborne missile launch systems, outlines the technical characteristics, advantages, and limitations of typical launch systems, and comprehensively discusses the advantages, applications, and current developmental status of modular launch systems in foreign naval surface launch technologies. Based on future combat paradigms, missile launch requirements, and technological trends, the paper analyzes the key development directions and trends for shipboard missile launch systems, particularly modular systems, in the evolution of surface launching technologies.

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    A Bird-Flocking-Inspired Phase Transition Control Method for UAV Swarms Driven by Phase Transition Rate
    Jingjing WU, Ming HE, Wei HAN, Chengzhuo LIU, Tao YUE, Haotian CHEN
    Modern Defense Technology    2026, 54 (3): 38-49.   DOI: 10.3969/j.issn.1009-086x.2026.03.004
    Abstract (8216)   HTML (515)    PDF(pc) (3689KB)(2902)       Save

    To address insufficient stability in the bird-flocking-inspired phase transition control model for UAV swarms, an improved method based on phase transition rate is proposed. By comparing the behavior of natural bird flocks with that of the bird-flocking-inspired phase transition control model, the regulatory mechanism of the temporal effect of phase transition on group stability is revealed. Based on the leader-follower architecture, a control protocol including attraction, repulsion, alignment, and circling terms is constructed. The temporal characteristics are quantified by the dynamic adjustment rate of the coefficients of behavioral control terms, which is defined as the “phase transition rate”. Simulation experiments show that under the condition of a low phase transition rate, UAV swarms can achieve stable transitions from an ordered state to three behaviors: dispersion, aggregation, and circling. Comparative experiments indicate that the order parameter of low-rate phase transition is higher than 0.9, and the span of the stable interval is 3.67 times that of high-rate phase transition, which confirms that reducing the phase transition rate can improve the stability of behavioral transitions. Furthermore, a low phase transition rate inhibits the formation of vortex phases, indicating qualitative differences in behavioral patterns across different phase transition rates. This study demonstrates significant advantages in increasing the number of phase states in UAV swarms and improving phase transition stability. It not only verifies the key regulatory mechanism of phase transition rate on the phase transition process, but also provides new theoretical and methodological support for enhancing the engineering practicability of the bird-flocking-inspired model for UAV swarms.

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    Study on the Discriminability Between Ships and Corner Reflector Arrays Based on Dual-Radar HRRP Similarity
    Xiaofeng AI, Yihang HU, Li GONG
    Modern Defense Technology    2026, 54 (3): 1-10.   DOI: 10.3969/j.issn.1009-086x.2026.03.001
    Abstract (7471)   HTML (2180)    PDF(pc) (4288KB)(16186)       Save

    Corner reflector arrays can generate high resolution range profiles (HRRPs) similar to those of ship targets, posing significant challenges to existing radar recognition systems. However, the variation patterns of HRRPs for corner reflector arrays and ship targets differ with observation angles. Leveraging this distinction, this paper proposes a dual-radar HRRP similarity feature to discriminate between corner reflector arrays and ship targets. Electromagnetic simulation results demonstrate that this feature effectively captures the differences in HRRP stability under varying viewing angles for the two target types. When the line-of-sight angle between two radars exceeds 60°and the signal-to-clutter ratio (SCR) is -2 dB, the recognition accuracy for distinguishing corner reflector arrays from ships reaches 99.07% using the dual-radar HRRP similarity feature.

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    Study on Prograde and Retrograde Orbit Interception Based on the Adjoint Method
    Yadong CHEN, Bo LÜ, Tianzhu REN, Junhui LIU
    Modern Defense Technology    2026, 54 (2): 82-91.   DOI: 10.3969/j.issn.1009-086x.2026.02.007
    Abstract (7221)   HTML (398)    PDF(pc) (2397KB)(3638)       Save

    In view of the effect of different prograde and retrograde rendezvous modes on miss distance, the vehicle terminal guidance rendezvous process is modeled and analyzed based on the theory of adjoint method. The original model of the terminal guidance problem is established, and the adjoint model of the problem is established based on the adjoint method. Normalized analytical expressions for the influence of factors such as target maneuver and initial heading error on miss distance were obtained. Based on the above theoretical analysis, the characteristics of reverse orbit head-on rendezvous, pursuit following orbit rendezvous and forward following orbit rendezvous are summarized.

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    Target Assignment and Fire Scheduling Method for Unmanned Combat Systems
    Peilin LI, Jie GUO, Xifeng CHEN, Yangyang WAN, Shengjing TANG
    Modern Defense Technology    2026, 54 (2): 69-81.   DOI: 10.3969/j.issn.1009-086x.2026.02.006
    Abstract (7008)   HTML (401)    PDF(pc) (3878KB)(3994)       Save

    To address the real-time and efficiency requirements for multi-target cooperative interception by unmanned combat systems in dynamic battlefield scenarios, this paper proposes a greedy target assignment and fire scheduling method based on dynamic time window (GTAFS-DTW). By constructing a relative motion model between combat units and targets, the proposed method incorporates engagement distance constraints, task execution constraints, and target maneuver characteristics. a dynamic time window screening mechanism is designed with the optimization objective of minimizing engagement time and impact time difference. On this basis, a hierarchical greedy strategy is adopted to prioritize unit-target pairs with overlapping feasible engagement intervals, and temporal cooperative optimization is achieved through iterative adjustment of window boundaries and fire scheduling. Simulation results demonstrate that GTAFS-DTW effectively reduces impact time deviation to within 0.5 s in both lateral and longitudinal queue scenarios compared with traditional discrete particle swarm optimization (DPSO), significantly enhancing computational efficiency and satisfying real-time optimization requirements.

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    Research and Enlightenment of Artificial Intelligence Defense Technology
    Qingtian ZHAO, Liwei LI, Xin CHEN, Lizhi HOU
    Modern Defense Technology    2024, 52 (3): 55-63.   DOI: 10.3969/j.issn.1009-086x.2024.03.007
    Abstract (6937)   HTML (361)    PDF(pc) (1406KB)(2604)       Save

    The wide application of artificial intelligence technology in the military field has led to the continuous evolution of war forms. To meet the challenge of intelligent warfare, this paper analyzes the development trend and the role of artificial intelligence technology and discusses the necessity of developing artificial intelligence defense technology in the military. From the view of "hard strike" and “soft strike”, the technical ideas of defense against anti-AI weapon systems and AI security defense architecture are given. The technical principles of pollution strike, reverse strike, backdoor strike, and confrontation strike are analyzed emphatically. Suggestions for strengthening AI defense technology research are given from six aspects: top-level design, application review, data governance, primary analysis, command art, and human-machine hybrid intelligence.

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    Target Association Method for IFF Based on Evidence Theory
    Shanyong YAN
    Modern Defense Technology    2026, 54 (2): 61-68.   DOI: 10.3969/j.issn.1009-086x.2026.02.005
    Abstract (6727)   HTML (404)    PDF(pc) (1795KB)(2843)       Save

    To address the problem of association between IFF targets and radar targets in scenarios dense target scenarios, an association method based on evidence theory is proposed. A positional correlation model is established. Evidence and its basic probability assignment (BPA) are generated based on the azimuth and range measurement capabilities of the radar and IFF interrogator, as well as data from multiple measurements. Evidence derived from multiple measurements of the same target is combined using the Dempster rule to construct a combined evidence set. The association of all targets is completed sequentially based on a maximum value search within the combined evidence set. The simulation results demonstrate that, the proposed method achieves higher association accuracy than the nearest neighbor (NN) method at equivalent time complexity. Furthermore, compared to the Kuhn-Munkres (KM) algorithm, the proposed method achieves higher accuracy in most dense target scenarios with lower time complexity.

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    Analysis on Winning Mechanism and Countermeasure Mode of Anti-submarine Warfare
    Zhuo BAI, Bangchu ZHANG, Weiyu ZHU, Pengkun YANG, Yiyong LIANG
    Modern Defense Technology    2024, 52 (3): 36-47.   DOI: 10.3969/j.issn.1009-086x.2024.03.005
    Abstract (6657)   HTML (380)    PDF(pc) (3404KB)(4032)       Save

    In response to the existing issues of unclear command relationships, ambiguous information flow, and limited means of disposal in anti-submarine warfare, this study proposes mechanisms and modes for achieving victory in anti-submarine operations. It approaches the problem from three perspectives: the physical domain, the information domain, and the intelligent domain. Based on the dynamic and evolving OODA(observation,orientation,decision,action) operational loop theory, combined with an analysis of the current status and trends in anti-submarine equipment and operational styles, a concept design for manned-unmanned cooperative anti-submarine warfare is presented. Additionally, key technological requirements for intelligent domain anti-submarine warfare are summarized, aiming to provide insights for the future development of low-cost and efficient anti-submarine operations.

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    Tactical Intent Recognition of Complex Air Targets Based on PACA
    Xiaocheng SONG, Shuting FENG, Tao JIANG, Zhi LI
    Modern Defense Technology    2024, 52 (3): 48-54.   DOI: 10.3969/j.issn.1009-086x.2024.03.006
    Abstract (6438)   HTML (350)    PDF(pc) (799KB)(1860)       Save

    In view of the dynamic nature of air target track, time sequence variation and multiple intentions in battlefield, this paper proposes a recognition method based on end-to-end generic attribute learning, which is used as the basic framework of intelligent multi-intention recognition model. By integrating the time sequence features and attribute characteristics of the target track, the unified input coding information is compressed and modified to encapsulate the knowledge and experience of experts as labels, and the commander's thinking mode of wartime situation judgment is learned to eliminate the interference factors brought by its concealment, deception and confrontation, so as to obtain the complex tactical intention of the specific target. Through the simulation experiment, the common multi-classification evaluation system is used to analyze the influence of the end-to-end training method on the results, and the comparison analysis with the relevant methods shows that the proposed algorithm is more effective and valuable for multi-intention recognition, and can be used to support the establishment of the correlation between non-cooperative targets and defense important places in the combat planning system.

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    Review of Optimization Algorithms for UAV Routes
    Wenbiao HE, Yongjiang HU, Wenguang LI
    Modern Defense Technology    2024, 52 (4): 24-32.   DOI: 10.3969/j.issn.1009-086x.2024.04.003
    Abstract (6340)   HTML (414)    PDF(pc) (827KB)(2165)       Save

    With the increasing mission complexity and environmental uncertainty of UAV, the requirements for route planning also increase, and the complexity of the route planning problem gradually increases from single UAV route planning to multi-UAV planning, and from single mission to multi-mission. To find a solution to the UAV route planning problem, a comprehensive analysis from aspects of concept, connotation, task modeling and algorithm analysis is presented. To solve the problems of existing route planning algorithms, such as, poor optimal path effect, slow convergence speed and tendency of falling into local optimization, applications and problems of UAV route planning with A* algorithm, particle swarm algorithm, genetic algorithm as well as ant colony algorithm are analyzed, and directions of algorithm optimizations and improvements are proposed.

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    Research on Unexploded Ordnance Disposal Technology Based on Drone in Low Altitude Environment
    Yongliang HE, Zhenyu GAO, Hui TANG, Chen FEI
    Modern Defense Technology    2026, 54 (3): 50-59.   DOI: 10.3969/j.issn.1009-086x.2026.03.005
    Abstract (6221)   HTML (447)    PDF(pc) (2053KB)(1556)       Save

    With the continuous advancement of combat-oriented training, a certain number of unexploded ordnance (UXO) may appear on field training grounds. Manual methods for UXO disposal involve high risks and require considerable manpower. Meanwhile, the rapid transformation of operational support in low-altitude airspace environments provides new possibilities for disposing of UXO. This paper mainly introduces UAV-based UXO disposal technology from the perspective of low-altitude UAV operations. It first reviews the current research status of UXO detection, recognition, and neutralization technologies, and then summarizes the existing difficulties and challenges based on an analysis of the full process of UXO disposal. Taking UAV-based UXO disposal as an example, it explores key technologies such as the construction of training range maps, UXO recognition algorithms, and neutralization methods. Finally, it puts forward views on future development, aiming to provide guidance for the application of UXO disposal in subsequent low-altitude combat support.

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    Operational Action Identification Method from Knowledge Association Perspective
    Wendong ZHAO, Mingzhi ZHANG, Shengming GUO
    Modern Defense Technology    2024, 52 (3): 64-72.   DOI: 10.3969/j.issn.1009-086x.2024.03.008
    Abstract (6156)   HTML (285)    PDF(pc) (868KB)(1823)       Save

    The situation data in complex battlefield environment presents large-scale and fragmented features, the knowledge graph technology is applied to situation awareness to recognize operations from the perspective of integrity and relevance. The knowledge graph of operational action is constructed. The situation data such as operational action types, operational forces and attributes are organized in the form of graph to realize the correlation of operational knowledge. An operational action recognition model based on knowledge is designed. The model can fully utilize the attribute information and association information in the graph to enrich the vector representation of entities. By measuring the authenticity of triples, the operational action types and the relationships between combat forces can be recognized. Experimental results show that the proposed method can effectively recognize operations and help the commander to analyze the battlefield situation in depth.

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    Analysis of Anti-jamming Performance of Adaptive Frequency Selection Diversity in Troposcatter Communication
    Binsong SHEN
    Modern Defense Technology    2024, 52 (4): 65-72.   DOI: 10.3969/j.issn.1009-086x.2024.04.007
    Abstract (6058)   HTML (316)    PDF(pc) (2164KB)(969)       Save

    In order to improve the evaluation accuracy of anti-jamming performance of frequency selection diversity in troposcatter communication, an analysis method of adaptive frequency selection diversity anti-jamming performance is proposed. Based on the anti-fading diversity reception demodulation algorithm, a frequency selection anti-jamming analysis model is established. Through simulation analysis, accurate anti-interference performance of frequency selection diversity is obtained, and quantized analysis results are obtained according to different interference characteristics. The simulation results show that the adaptive frequency selection diversity anti-jamming analysis method is superior to the existing troposcatter communication anti-jamming analysis method, convenient and effective, and significantly improves the accuracy of anti-jamming performance evaluation.

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    Research on the Interception Capability of Electronic and Firepower Integrated Multilayer Air Defense System Based on Queuing Theory
    Qiang GUO, Jinghua WANG, Wei WEI, Tao WANG
    Modern Defense Technology    2024, 52 (3): 20-25.   DOI: 10.3969/j.issn.1009-086x.2024.03.003
    Abstract (5915)   HTML (416)    PDF(pc) (580KB)(1192)       Save

    In view of the problem of electronic and firepower integrated multilayer air defense forces interception capability evaluation, regarding the ground-to-air radar jamming system, medium-range air defense missile, short-range air defense missile and antiaircraft weapon as multilayer multi-channel system composed of 4 layers of defense, the interception capability evaluation model of electronic and firepower integrated multi-layer and multi-channel air defense system based on finite waiting queuing system and loss queuing system is established. The example analysis shows that the method can provide a scientific assessment method to the effectiveness of electronic and firepower integrated multilayer air defense system and it can provide reference and basis for optimizing the deployment plan of air defense forces.

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    Anomaly Detection in Radar Reconnaissance Signals Using Multidimensional Temporal Intelligence Fusion Network
    Linxuan HUANG, Minghao HE, Chunlai YU, Mingyue FENG, Fuqun ZHANG, Yinan ZHANG
    Modern Defense Technology    2026, 54 (2): 118-127.   DOI: 10.3969/j.issn.1009-086x.2026.02.011
    Abstract (5885)   HTML (228)    PDF(pc) (1953KB)(479)       Save

    Addressing the issue of data anomalies in radar countermeasure reconnaissance signals caused by susceptibility to interference in complex electromagnetic environments, this paper proposes a multidimensional temporal intelligent fusion network (MDTFusionNet). The architecture integrates temporal convolutional network(TCN), long short-term memory(LSTM), and self-attention mechanisms with a gated network that dynamically adjusts module weights through a gated network, and optimizes model robustness by combining weight sparsity constraints. This constructs an anomaly detection model capable of not only capturing short-term fluctuations in radar signals and grasping long-term trends but also dynamically focusing on critical pulse information. To verify its effectiveness, multi-layer perceptron(MLP), TCN, and LeNet networks are used for comparison, and evaluations are conducted from the perspectives of loss function and accuracy. Experimental results show that the loss function outliers of MDTFusionNet are significantly smaller than those of traditional models, and the accuracy is higher. Ablation studies further confirm that each component in MDTFusionNet has its respective role, enabling better learning of temporal data feature distributions and accurate anomaly detection, verifying its superiority and practicality in radar countermeasure reconnaissance signal anomaly detection.

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    Navigational Warfare Capacity System Construction and Development Proposals
    Chao YUN, Zhiqiang TAN, Jianyong CUI, Panpan JIANG, Teng ZHENG
    Modern Defense Technology    2024, 52 (3): 26-35.   DOI: 10.3969/j.issn.1009-086x.2024.03.004
    Abstract (5833)   HTML (381)    PDF(pc) (986KB)(1843)       Save

    As the role of satellite navigation systems in war continues to improve, it faces an increasingly complex battlefield electromagnetic environment, in order to ensure accurate and efficient transmission of timing and positioning information, and seize the information advantage, the military powers in the world continue to research and develop navigation war-related technology and its equipment, and its successful application to the construction of a new type of satellite navigation system and navigation jamming equipment, to improve the battlefield survivability of satellite navigation systems and the battlefield denial capability of navigation jamming equipment. The navigational warfare related overview and status role are introduced, the capacity status and development trend of navigational war are analyzed in detail, and the suggestions for the development of navigation warfare are given, the relevant research achievements can provide reference for the navigation development.

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    A Method for Rapid Acquiring and Tracking Hypersonic Cooperative Targets
    Jingxiao LI, Gege TIAN, Guanghui XU, Chenglu ZHAO, Jing LUO
    Modern Defense Technology    2026, 54 (2): 92-99.   DOI: 10.3969/j.issn.1009-086x.2026.02.008
    Abstract (5744)   HTML (320)    PDF(pc) (3497KB)(821)       Save

    Aiming at the urgent requirements of guidance radar to guide hypersonic weapons to intercept incoming targets in fiercely air-to-ground military confrontation, rapid acquisition and tracking technologies are studied. There are several problems need to be solved: one is the RCS of hypersonic missiles/shells is small that not easy to acquire, the second is the hypersonic missiles/shells flight speed is high and has a wide speed distribution that difficult to detect and track. The problems are solved from three aspects: radar system design, waveform design and tracking model design. Through the design of radar operating system based on narrowband signal processing and PD processing, the influence of range migration is reduced, and the detectability of dim target under strong clutter background is improved. Through the design of guidance waveform based on double PRF(pulse repetition frequency) sets, the velocity ambiguity in Doppler is resolved. Through the design of search interception screen based on prior information and the design of taking velocity into track initiation and track correlation model, the rapid acquisition and stable tracking of hypersonic cooperative targets are realized. The effectiveness of the proposed model is fully verified in the semi-physical simulation test.

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