Abstract：The lag of maneuvering target tracking results on the time axis is a major difficulty in the field of maneuvering target tracking. There are many cases of time delay, which are especially obvious in the early stage of tracking and the time period when a large maneuver occurs, and there is often a peak of error because of this, if there is a way to suppress or eliminate the time delay phenomenon, the tracking effect will be significantly improved. Starting from the results and phenomena of simulation experiments, combined with Kalman filter theory, interactive multi-model algorithm and modern neural network model, this paper will deeply analyze the time delay problem, and obtain different causes of time delay according to the changes of each stage of tracking and give corresponding solutions, so as to provide reference for improving the tracking effect of maneuvering targets in the future.

Abstract：To address the issue of poor target state estimation accuracy under conditions where sensors have system bias and noise is non-Gaussian, a target tracking method based on the maximum correntropy Kalman filter (MCKF) under biased measurements is proposed. This approach introduces a differential mechanism that constructs differential measurement equations from the biased measurements of the target at adjacent time points, effectively mitigating the effects of system bias. Subsequently, the maximum correntropy criterion (MCC) is employed to quantify the higher-order moment information of the estimation error with differential measurements serving as a priori conditions. This leads to the derivation of the filtering iterative equations for the algorithm under biased measurements. Simulation results demonstrate that, when system observations are affected by sensor system bias and non-Gaussian noise, the proposed method outperforms existing approaches in terms of tracking performance.

Abstract：Due to the low tracking accuracy of existing simple transition probability matrices and the long tracking time of complex transition probability matrices, it is difficult to meet the requirements of maneuvering target tracking in three-dimensional space. Aiming at the design problem of transition probability matrix, starting from mechanism analysis, a model transition probability matrix design method based on membership function is proposed, and the three-dimensional interactive multi model algorithm is improved and perfected. The simulation results show that the method of modifying the transition probability matrix based on the membership function effectively improves the tracking accuracy of three-dimensional maneuvering targets.

Abstract：The detection and tracking of maritime targets are key tasks in maritime security and military applications. To address the low measurement accuracy of target distance in complex maritime environments, affected by factors such as sea clutter, an improved multi-sensor data fusion algorithm is proposed. The algorithm utilizes the joint detection results of shipborne radar and land-based radar on the sea surface. Firstly, the data from multiple sources are transformed into a common coordinate system. Then, the Robust Z-score method is employed for preprocessing the longitudinal data to eliminate abnormal data. Subsequently, by redefining the confidence distance measure, sensor results with higher confidence are used to replace the discarded data, and an adaptive weighted fusion of the results is performed. Furthermore, to further improve the data accuracy, a segmented fusion mechanism is introduced. The improved sensor data fusion algorithm is cascaded with a stepwise adaptive weighted fusion algorithm. By measuring the similarity of the fusion results in each segment and setting a confidence threshold, the final fusion result is determined. Simulation experiments confirm the effectiveness and accuracy of the algorithm.

Abstract：The 5G era is approaching with the gradual increase in deployment density of 5G devices, the cost price is too high from the perspective of simply increasing the deployment of macro base stations. On the other hand, the demand for personalized of 5G to B and to C is gradually increasing. In response to the issues of 5G frequency band heightening, penetrate walls ability reducing and personalized requirements increasing, 5G integrated small base stations has emerged, gradually improving its effectiveness in the field of supplement to blindness and heat. Pointing at the issue of communication difficulties in water operation, a new network method based on CPE is proposed. This method is easy to install and cost-effective, which can greatly meet the needs of users and be widely promoted.

Abstract：As an important component of 6G communication technology, the Low Earth Orbit (LEO) distributed satellite network can achieve high-speed transmission and low-latency communication, and meet the high-speed and low-latency requirements of 6G communication technology. This paper addresses the networking method of LEO distributed satellite networks. The routing algorithms of the satellite network are summarized. A joint routing algorithm based on bandwidth and delay is proposed, and three different routing algorithms are implemented to select. It is found that the performance of each algorithm is obviously different. The experimental results show that the joint algorithm based on bandwidth and delay can better balance the network load and reduce the delay while selecting the best path, and improve the transmission efficiency of satellite network.

Abstract：This paper establishes a millimeter-wave channel model for unmanned aerial vehicles based on line-of-sight probability using the ray tracing method, and a double-slope model analysis is carried out for path loss. This paper describes the modeling process of line-of-sight probability and carries out model parameter analysis. Due to the influence of terrain occlusion and other environments, the reflection and bypassing paths with large losses cause the received strength of the signal to fluctuate greatly before and after the mutation point, which makes the single-slope fit model no longer applicable. Therefore, this paper uses linear regression to fit the single-slope and double-slope received power models to the simulation data under two types of terrain, and analyzes the fitting effect of the two models. The results show that the dual-slope received power model fits better than the single-slope model, and the two models have higher fitting accuracy when the terrain is more flatten.

Abstract：As the infrastructure in the field of information and communication, 5G communication base station meets people's basic needs for daily call and traffic use. In response to the national "3060" dual-carbon strategy, the communication base station needs to change the traditional power supply mode, introduce green energy such as photovoltaic system and energy storage battery, and realize the "green, energy-saving and low-carbon" development. Under different power conditions, how to plan photovoltaic and energy storage configuration has become an important research direction in the field of information and communication. This paper innovates the simulated photovoltaic function model, explores the optimal method of light storage configuration under different power conditions, innovates the charging and discharging method of optical storage system, and realizes the maximum benefit of green energy application.

Abstract：With the development of ultra-large scale FPGA chip technology, the number of chip pins has increased to over 1 000. How to achieve efficient testing of ultra-large scale multi-pin FPGA chips has become a challenge for ATE online testing. For a large-scale FPGA chip with thousands of pins, based on the programmable characteristics of FPGA, ATE testing was carried out using a combination of multi-chip effective pin function parallel testing and single chip full pin electrical performance parameter testing, achieving 4-chip simultaneous testing of thousands of pin FPGA chips, and improving testing efficiency by more than three times.

Abstract：Wafer level packaging technology can achieve multi-chip interconnection. However, issues such as packaging size, number of layers, and packaging yield have limited its development in the process of circuit miniaturization. This article takes a fan out wafer level packaging circuit as an example. Based on advanced packaging technology, using software design and simulation optimization methods, combined with packaging experience and practical application scenarios, the organic substrate packaging design and manufacturing were completed through rewiring and chip flip chip interconnection, achieving the goal of low-cost and mass production of the circuit. The design concept and manufacturing process of this product can provide reference for the miniaturization development of other hardware circuits.

Abstract：Aiming at the problem of low efficiency and low accuracy of manual measurement of a kind of micro stamping parts, a measurement method of micro stamping parts based on machine vision is proposed. Firstly, the measurement system design of the system is introduced, and then the measurement method is introduced. The image processing software is used to preprocess the extracted image, such as graying and denoising, and then the Canny edge detection algorithm is used for threshold segmentation to extract the contour of the part. In the contour processing algorithm of these parts, a contour segmentation method based on RDP algorithm is proposed for contour segmentation. In the edge positioning, a method of edge point detection based on caliper tool is proposed to improve the accuracy of edge positioning of various contours. Then the fitting algorithm based on Tukey weight function is used to measure the straight line and arc to obtain the pixel size. Finally, the pixel size is converted to physical size through calibration. Experimental results show that the design has high consistency and accuracy for the measurement of micro stamping parts, and has high efficiency.

Abstract：Reaction flywheels is a key component of the satellite attitude control system, and its performance is directly related to the control accuracy of optical remote sensing satellites. In order to achieve high precision control of the speed for reaction flywheel, a disturbance-observer-based nonlinear control method is proposed. Firstly, the mathematical model of the reaction flywheel based on the brushless DC motor is established, the factors affecting the speed control accuracy are analyzed, and the nonlinear model for the controller design is constructed. Then, a disturbance-observer-based nonlinear controller is designed by combining disturbance observer and nonlinear control theory, and the stability of the control method is proved by using Lyapunov theory. Finally, the numerical simulation indicates that the flywheel speed can reach the control target smoothly, and the accuracy is better than the traditional PI control method. Moreover, the effectiveness of the proposed method is verified on the real flywheel control test.

Abstract：In order to meet the requirements of UAV multi-mission mode and effectively realize mission reconfiguration, this paper researches the reconfiguration problem of integrated electronic system in multi-mission mode and proposes a reconfiguration algorithm based on the improved moth-flame optimization algorithm. According to the integrated electronic system reconfiguration model and reconfiguration algorithm, the multi-mission reconfigurable integrated electronic system is designed. The simulation experiment is conducted for the improved moth-flame optimization algorithm, and the results are analyzed and verified to compare the experiment with the differential evolutionary algorithm and the standard mothballing optimization algorithm. The experiment proves that the reconfiguration algorithm is able to generate high-quality reconfiguration blueprints quickly and iteratively by optimizing multi-objectives, which meets the multitasking mode requirements of integrated electronic systems.

Abstract：In response to the challenges posed by traditional self-calibration methods for cameras, which require three orthogonal vanishing points that are often difficult to satisfy in practical scenarios, and face difficulties in determining distortion coefficients, this paper proposes an improved camera calibration method. The proposed method introduces a technique based on two vanishing points and low-rank textures for calibrating and correcting distortion in an onboard camera. The method initially employs the RANSAC algorithm for vanishing point detection, utilizing the geometric properties between the vanishing points and the camera imaging projection model to solve for the camera's focal length and extrinsic parameters. Then it models the image with low-rank characteristics and iteratively solves for the camera's distortion coefficients using an augmented Lagrangian algorithm. Experimental results demonstrate that the proposed method exhibits superior accuracy and practicality.

Abstract：CFD simulation analysis report is an important part of the post-processing of CFD software. CFD simulation analysis report is generated by manual editing, manual extraction and program curing. These methods have some problems such as low efficiency, slow generation speed and limited application engineering. Therefore, a template-based CFD simulation report generation method is proposed in this paper. This method designs a CFD simulation analysis report template based on Jinja2 template engine. Dynamic content generation script is introduced into the template to realize dynamic content generation under different projects. In the process of dynamic content generation, the data asynchronous communication based on message middleware is adopted to realize efficient and parallel dynamic content generation. Based on this method, a prototype system for automatic generation of CFD simulation analysis report is designed, verifying the effectiveness of the method.

Abstract：Aiming at the development requirements of 5G small base station project, based on the theoretical research of 5G communication system and the requirements of 3GPP RF performance indicators, a 3.5 GHz RF front-end is designed and developed by Advanced Design System（ADS）simulation software. According to the whole development process of RF front-end, this paper conducts in-depth research and evaluation on the performance parameters of key RF components such as power amplifier, low noise amplifier, RF switch and filter, and puts forward the corresponding schematic design, system link simulation and optimization of board and end test indicators. Finally, the actual test of board and end performance indicators is passed. All the index data meet the technical requirements.

Abstract：According to the communication requirements of the satellite S-band Tracking, Telemetry and Command system (TT&C), a conical Archimedean spiral antenna with wideband and high gain circular polarization is designed for the S-band. The quarter-wavelength coaxial slotted balun completes the balance-unbalance conversion of the signal and wideband impedance matching. The dual-arm Archimedean antenna can provide good circular polarization characteristics, and the FR4 material as a cone not only provides support for the antenna, but also effectively achieves the control of gain and beamwidth. The measured antenna has a Voltage Standing Wave Ratio (VSWR) of less than 1.5, a gain of more than 0 dBi within ±70° and an axial ratio of less than 5 dB in the transceiver frequency band, which can effectively realize the transceiver multiplexing function of the TT&C antenna.

Abstract：The disaster of tailing pond causes great casualties and property losses. How to monitor tailing pond has become a problem discussed in the world. This paper uses the Linux system equipped with i.MX6ULL processor for embedded development. Through the design of embedded data acquisition system, cloud server background program and client remote monitoring program, a GNSS and multi-sensor integrated tailings pond monitoring system is completed. The system has GNSS high-precision displacement, rainfall, tilt, pore pressure and water level data acquisition, cloud platform data transmission and storage, user remote control and real-time monitoring functions. Through the field simulation experiment, the results show that the system runs stably, has high reliability, and the accuracy of each sensor meets the requirements of the standard, which meets the demand of the remote monitoring of the tailings pond.

Abstract：An FPGA design for waveform generation based on JESD204B interface is introduced. This design mainly consists of FPGA, DAC, DDR3 and network chips, and realizes the generation of intermediate frequency signals with dual channel frequency range of 2 GHz to 3.5 GHz. FPGA and DAC are linked through high-speed serial interface JESD204B, realizing waveform generation, digital up-conversion and analog conversion, network chips and DDR3 are used for transmitting and storing special waveforms. The article provides a detailed introduction to key technologies such as JESD204B interface clock synchronization design, DDS signal generator, digital waveform reception, storage, and transmission. Finally, the reliability of the FPGA design is verified by the intermediate frequency signal captured by the DAC output through a spectrum analyzer.

Abstract：Ka-band G/T is one of the most important indicators of 12-meter antenna of remote sensing receiving system. Suitable G/T method is needed in different situations. Combined with the characteristics of 12-meter antenna, this paper discusses the advantages and disadvantages of segmented method, beacon method, comparative method and radio frequency source method. Using the moon as a radio frequency source is brought up in Ka-band G/T test method, and the futrue research direction is pointed out. At last, recommended test method has been provided to engineers based on the test results.

Abstract：In this paper, a low-cost, wide-coverage and high-reliability circularly polarized antenna based on AOP (antenna on package) technology for Ka-band phased array application is designed. It interconnects with the RF front end by BGA planting ball directly, which has the characteristics of small loss, light weight and low cost. Meantime it overcomes the shortcomings of narrow bandwidth of conventional single-layer microstrip antenna by proposing metasurface-designing， which successfully exhibit three modes circular polarization using characteristic mode analysis, as well as reduces the risk of antenna layering failure during high and low temperature in space, resolves the problems of low profile and broad bandwidth of existing satellite phased antennas. Taking four antenna elements as a unit with 2×2 sequential rotation to broad working bandwidth and axial ratio bandwidth. The measured results show that the axial ratios are less than 3 dB from 28 GHz to 31 GHz with 50 degrees scanning angle, and the measured gains remain stable in working band, which are very suitable for Ka-band communication application of satellite system.

Abstract：The article analyzes the limitations of the current command and display system data engine software architecture in response to the aerospace launch field′s trend towards diverse types and parallel tasks. It outlines the construction of a multi-level cache and the optimization of Flink task scheduling algorithms to achieve a cloud-native data processing mechanism and data engine system. The system adopts a microservices architecture, utilizing container technology to deploy core modules for aerospace-focused data access, distributed computing, and multi-level data caching, effectively easing system operational pressures and enhancing the timeliness of data processing and task situation information retrieval. This provides more comprehensive and precise data support for data visualization and decision-making. By integrating DevSecOps into the overall development and operations processes, it supports rapid development, deployment, and delivery, offering a reference for the research and development of the next-generation command and display systems.