The performance of the controller is the key to ensure the stability and controllability of the missile in guided flight. Without considering the coupling between the channels, we established a three-channel missile mathematical model for BTT missile based on Bank-To-Turn (BBT) control technology. The sliding mode variable structure controller was designed, and the closed-loop control system was constructed for BTT missile. Comparative study was made with PD control and the situation without the controller. The simulation results show that: the control effect of sliding mode variable structure is the best, which can quickly track the guidance command, and has good dynamic and steady-state performance.

To solve the problems of low quality and poor resolution of infrared images, super-resolution reconstruction based on sparse representation is put forward. First of all, Sobel operators of different directions are applied to extract the feature of low-resolution images, and the high and low-resolution dictionaries are trained by using the extracted feature images. Then the same way is used to obtain the feature image of low-resolution target image. The sparse coefficient of the target image is obtained through low-resolution dictionary and the feature image. Finally, according to the structural similarity between high and low-resolution images, the high-resolution image can be reconstructed by using the sparse coefficient and high-resolution dictionary. The experiments prove that this method can get a better super-resolution reconstruction effect.

In view of the interference of ghosting phenomenon to target detection, which is caused by the observation equipment in range experiment, and the interference of clouds to dim small target in the sky background, an algorithm for aerial infrared small target detection is proposed based on partial row pixel contrast. The algorithm can be used for detecting aerial infrared dim targets under low SNR condition. The method uses median filter and morphological filtering to obtain filtered image, extracts the region of interest from the filtered image based on the pixel feature of the target area;then uses the partial row pixel contrast to detect the position of the target. The method can greatly improve the detection efficiency with less time. This paper introduces and analyzes the theoretical effectiveness of the infrared small target image detection algorithm, and makes comparison of it with other algorithms through the Matlab simulation. The experimental results show that the proposed algorithm can detect the aerial infrared dim small targets more effectively under the condition of low SNR with higher accuracy and better performance.

The traditional image quality assessment algorithm can not meet the actual requirement since the visual information and the essential features of the image are not taken into consideration. We studied the image edge information extraction and singular value decomposition method, and proposed a new method for objective quality assessment, which can give consideration to both of the information. The singular value information of the image shows the essential information of image and human eyes are sensitive to the edge information of image. Theoretically, the algorithm of image quality assessment based on edge information and singular value decomposition is better than traditional methods. The simulation experiment results show that: compared with the tradition methods of SSIM, MSE and PSNR, the proposed algorithm is more consistent with human visual system, and has better correspondence between subjectivity and objectivity.

The performance of BeiDou receiver is affected by the carrier acquisition speed and carrier frequency acquisition error. Traditional algorithms have a large amount of calculation when calculating the fine frequency, thus an approach is proposed to find the fine frequency through phase relation. Firstly, the algorithm uses the FFT circular correlation to realize the fast acquisition. Then the phase relation of the continuous input signal stripped C/A code in a shorter time is used to estimate the fine frequency. The simulation results show that the algorithm can reduce the Doppler estimation error. According to the analysis, when the input signal is strong, the algorithm can keep the error of the Doppler frequency within 10 Hz. When the input signal is weak, it can keep the error of the Doppler frequency within 50 Hz. The study has certain reference value for research on BeiDou receiver.

Rotating modulation for Strap-down Inertial Navigation System (SINS) is an auto-correction technology in nature. In order to study the error compensation principle of single-axis rotary SINS, an attitude error model is deduced by the quaternion differential equation, which is consist with the one deduced by direction cosine matrix differential equation. The general system error models and error propagation equation on stationary base are established, and the modulation forms of inertial device errors are analyzed, which provides a reference for rotary scheme design. Simulation is made to the influence of gyro constant drift, scale factor error and setting error based on single-axis continuous rotation on navigation error. Theoretical analysis and simulation results show that continuous rotation of inertial measurement unit can effectively restrain the navigation error.

Frequency Modulated Continuous Wave (FMCW) Synthetic Aperture Radar (SAR) is a small-size, light-weight and cost-effective imaging radar, which is suitable for operation on a small flight platform. In the dechirp processing of FMCW SAR, the transmitting signal is more feasible for using as the mixing signal. But the bandwidth is decreased because of echo delay in the dechirp processing. The bandwidth decrease becomes serious when the target is far away or the pulse repetition time is short, and the range resolution is reduced. We constructed a unified compensation function to compensate for the echo signal, thus the bandwidth was fully exploited and the range resolution was unaffected by echo delay. Simulation results prove the correctness of the compensation function and the effectiveness of the compensation method.

Decision making for multi-target attacking is composed of target grouping and attack direction optimizing. Analysis is made to the Launch Acceptable Region (LAR) of Small-Diameter Bomb (SDB) in multi-target attacking. Then, the mathematical models of target grouping and attack direction optimizing are established. The decision-making is divided into three steps of multi-target grouping, attack direction optimizing and LAR calculating. The feasibility of the proposed model is verified through scenario simulation.

The GPS signal calibrating crystal oscillator frequency source can output time frequency signal with high accuracy. However, when the GPS signals can not be received due to some factors, the system can only rely on the crystal oscillator to keep a standard output at a certain frequency. Influenced by aging and other factors, drift may arise in the output frequency of crystal oscillator. To correct and compensate for the output frequency drift at the time when losing the GPS signal, an algorithm is proposed based on ARMA model for maintaining the frequency source accurate. Through analyzing the historical calibrating data, the crystal oscillator performance degradation model is established, thus to implement the compensation for the system output frequency, and keep a relatively stable and highly accurate output frequency. The proposed method is applied to a GPS signal calibrating crystal oscillator frequency source, and the result shows that the average relative error of the system output frequency can remain at 1. 80% after the GPS signal lost shortly.

Since the topograpthy of coastal regions is complex, which has a clutter model much different from the traditional statistic model, so it becomes a difficulty to simulate clutter of coastal regions accurately and rapidly. First, the method for calculating relevant parameters of scattering cells based on digital elevation model, airborne radar parameters and the location of plane, is described. The steps for simulating the clutter power spectrum by these parameters are presented, i. e. , judging each scattering cell belong to which range-Doppler cell, accumulating the power of scattering cells in the same range-Doppler cell, and implementing heterogeneous clutter power spectrum simulation. Because of the huge calculation amount in the simulation, the paper also provides a method to accelerate clutter simulation depending on compute unified device architecture in GPU. The simulation result of the radar clutter power in coastal regions is consistent with the real terrain environment, which is accurate and effective. As for the simulation speed, this method has significant improvement compared with the traditional methods, which is practical in engineering.

Aiming at the influence of deviations in the beacon antenna rotating frequency on accuracy of TACAN signal azimuth estimation, analysis is made to the difficulty of estimating TACAN antenna frequency deviation in frequency domain at first. Then, a method is proposed which can enhance the practicability of existing TACAN antenna frequency estimation algorithm. Finally, a TACAN antenna frequency estimation algorithm based on Gauss-Newton iteration is proposed from the view of time domain, and the method for selecting the initial value of iteration is given, which can guarantee the convergence of the algorithm. This algorithm can realize the real-time estimation of frequency deviation. The simulation results show that the algorithm has high estimation precision and can be used for real-time monitoring of TACAN antenna frequency deviation.

The pendulous gyro north-seeker has strict requirement to its initial erection azimuth, and it is difficult to implement omni-bearing north seeking. Taking a certain type of pendulous gyro theodolite as prototype, we established the motion equation of pendulous gyro in large azimuth by using Euler dynamical equations, deduced the mathematical model of gyroscope motion and the trajectory of gyroscope sensitive department, and proposed an improved rough north-seeking method for large azimuth, called tracking speed detection method. Experiments were designed and conducted to verify the new method. The analysis and experiment results show that the proposed method can achieve omni-directional north seeking at any initial erecting azimuth within 1 minute, and the maximum azimuth of the basic shaft of the gyro is about 6°. The new method is of great importance for realizing all-directional orientation of the pendulous gyro north seeker.

A refined track initiation algorithm is proposed for the objects in dense formation. The measurement clustering algorithm, which needs significant amount of computation, is not needed in the method. First, all possible associate point sequences are built up by extending the track initiation conditions. Then, clustering is made to all the sequences by comparing the different sequences to see if they have the common measurements. At last, optimized distribution is taken to the initial relative sequences belong to the same cluster, and the optimum scheme is selected to each object in the formation for track initiation. Simulation results prove that the method has fine performance on formation track initiation, low computational burden and high accuracy rate on track initiation.

This paper mainly introduces the software SE-Workbench and OSMoS used by French researchers in their research on range-gated laser imaging simulation. The simulation sequence and steps are introduced, and the passive imaging and laser active imaging results of target under the complicated condition are given. The general simulation flow of laser active imaging and the aspects needing attention are discussed. The contents can be taken as a reference for the domestic simulation research.

Head-Up Display (HUD) is a critical system that impact aircraft flight safety. If it is invalidated, it will lead to the catastrophic accident of controlled flight into terrain. The traditional safety assessment based on independent component failure cannot be adaptive to the feature of the integrated modular avionics system, which is highly coupling and is hardware resource sharing. And thus it is difficult to achieve a comprehensive and effective safety analysis. By using Safety Case theory, we built up a safety assessment model of HUD and established traceability between safety goals and safety solutions, to achieve assessing the safety of HUD. The results showed that: the safety analysis model of civil aircraft HUD system based on Safety Case can elaborate that system safety objectives are met by safety evidences.

Aiming at the issue of heading effect of Hemisphere Resonator Gyro (HRG) platform Inertial Navigation System (INS) during the initial alignment, we studied the influence of heading effect error on the initial alignment accuracy of HRG INS. In order to eliminate the influence of heading error effect, we designed a self-calibration scheme of the heading effect based on the practical application requirements of the missile. The experimental results shows that this HRG INS heading effect calibration method can effectively compensate for the heading effect error and improve the accuracy of self-aligned HRG platform INS.

This paper focuses on the application of dynamic allocation method in the aircraft with thrust vector. Firstly, the aircraft is modeled by the time scale separation principle. The control system is divided into two loops of fast loop and slow loop. The dynamic characteristics of the actuator are set to a first order model. Then, the process of solving the dynamic allocation method is analyzed, and the dynamic property as well as steady property of the algorithm is proved. Simulation is carried out on dynamic control allocation of the aircraft with thrust vector, with consideration of the dynamic property of actuators including traditional actuators and thrust vector actuators. The simulation results show that: 1)The using proportion of high frequency actuators is increased in the maneuvering process, and the speed of attitude angle command tracking is faster; and 2) The thrust vector actuators keep a lower deflection rate, which is conductive to prolong engine life. The dynamic control allocation method has achieved good effect in the application of the aircraft with thrust vector.

Aiming at the characteristics of small sample and multiple variation trends of inertial platform error coefficient, an improved GM (1, 1) model is proposed. The model uses the improved background value and operator transformation of original data. The error caused by the “straight instead of curving” is eliminated by the method of background value reconstruction. Operator transformation method can weaken the randomness of the original data and enhance the monotonicity of it. Therefore, the improved GM (1, 1) model has a wider scope of application and higher forecast accuracy. Instance analysis result shows that: Compared with the traditional models, the improved model has higher accuracy of forecast and better fitting degree, which is more accurate to reflect the variation trend of inertial platform error coefficient.

Evaluation of pilot's in-flight workload is a significant consideration for the safety of civil aviation. However, some errors may be brought in the measurement and the recording of objective parameters. Based on a multidimensional workload evaluation, the time delay of eye movement and its impacts on workload evaluation are analyzed. The results shows that within a certain limit of error around 300 ms, varying from pilots to pilots, workload can keep the main information of the original workload. As the error increases, the workload may become unreliable. As a consequence, the time-delay error of eye movement should be controlled within a limited scale to ensure the validity and reliability of workload.

This paper focuses on design of integrated surveillance system simulator based on Integrated Modula Avionics (IMA) architecture.Different from the traditional federated avionics architecture, an integrated surveillance system simulator is designed by using IMA architecture.The implementation scheme for the activator, integrated surveillance system simulator, and the display and control system simulation platform is presented here.Simulation is made to verify the basic function of the integrated surveillance system, and the result shows the rationality and feasibility of the simulator design scheme.

Due to the facts that the degradation of inertial device is nonlinear and the historical degradation data is limited, a nonlinear degradation process model is utilized to estimate the Remaining Useful Life (RUL) of inertial device, and a Bayes method suitable for nonlinear degradation process is proposed. At first, non-informative prior distribution of two parameters is obtained by using Fisher information matrix. Then, by using likelihood function of independent increment, it is found that the parameters follow Gaussian-Inverse Gamma distribution. The first posterior distribution is obtained by using compatible historical degradation data and the second posterior distribution is obtained by using new degradation data. The parameters of single device and results of RUL are real-time updated in the end. The experiments show that the assessment result of nonlinear degradation process model is more accurate than the Wiener model. The RUL real-time prediction is achieved by utilizing the Bayes method, which can provide a reference for maintaining the inertial device.

On the basis of the Lambertian light emission pattern of LED, Hybird Taguchi-Genetic Algorithm (HTGA), the combination of the Taguchi method and the process of traditional Genetic Algorithm, is adopted to make optimal design of the TIR lenses used as beam shaper, the purpose is to meet the uniform illumination requirement of specific target surfaces. This algorithm uses the construal parameters as chromosome and constructs the evaluation function based on the illumination result of specific target surface, by which the structural parameters of TIR lens can be achieved. The whole process is performed on the platform based on the Matlab and TracePro. Results show that HTGA algorithms, along with parameter design features of the Taguchi method during the entire optimization process, can improve the performance of the traditional GA algorithm. With the light efficiency reaching 60%, the optimized TIR lens can efficiently improve the illumination uniformity on the target surface to 88%.

A scheme for realizing Application Specific Instruction Set Processor (ASIP) is chosen, which is based on a channel estimation algorithm of cell-special reference signals in TD-LTE downlink. The ASIP chip contains a set of instructions for particular applications. Besides, the assembly language realization of the scheme is implemented, which exhibits lower time complexity and less fixed point operation error. Simulation results of Verilog Compiled Simulator (VCS) show that the scheme has a good real-time processing capability.

The deception jamming of GPS is realized through launching pseudo GPS signal to replace the real GPS signal received in the target receiver. Through providing false navigation message and false pseudo-range information in the pseudo GPS signal, it can affect the positioning of the target receiver and make it get error position. This paper analyses how to replace real GPS signal in the target receiver tracking loop and how to set the parameters in the pseudo GPS signal for implementing GPS spoofing successfully. Matlab simulation is made for verification.