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2005 Vol. 31, No. 12

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Strategy of signal search and acquisition in spaceborne GPS receiver
Yang Chunbao, You Zheng, Zhang Yong
2005, 31(12): 1269-1273.
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Unaided cold start time is an important performance of spaceborne global position system(GPS) receiver. Reduction of cold start time was developed for C/A code navigation receiver on low earth orbit(LEO). The search method of frequency and code phase, signal detector and parameters select, doppler b...
Virtual design environments of flight control system
Qin Xudong, Chen Zongji, Gao Jinyuan, Huang Haodong
2005, 31(12): 1274-1278.
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Design-oriented virtual design environment of flight control system was established. The virtual design environment had a three-level structure. The top level was operations management based on database technology, in which product data management(PDM) systems were used to manage design documents, p...
Mission-based operational effectiveness evaluation model of combat aircraft
Zhang Jiankang, Cheng Long, Huang Jun, Wu Zhe
2005, 31(12): 1279-1283.
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To the combat aircraft operational effectiveness evaluation, mission effectiveness concept was presented based on combat aircraft’s different missions. With the probability analysis method, aircraft operation procedures were studied and abstracted into a group of probability values, and relevant eva...
Conforming Delaunay triangulation optimized by weighted method
Meng Xianhai, Li Jigang, Yang Qin
2005, 31(12): 1284-1288.
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As a conforming Delaunay triangulation (CDT) algorithm, Delaunay refinement method has widely application both in theory and practice. It always fails to terminate when there are some small angles intersected by input geometry constraints, so a sufficient condition for termination of Delaunay refine...
Predications of structural weight for high aspect ratio joined-wings
Wang Xiaoni, Yu Xiongqing
2005, 31(12): 1289-1292.
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The joined- wing is an innovative aircraft configuration with a structural connection between the front wing and the rear wing. An approach was presented to investigate the dependences of the structural weight of a hign-aspect-ratio joined-wing on the parameters of its aerodynamic configurations. Su...
Generality analysis of the pre-corrosion influence on the fatigue life for aircraft structure
He Xiaofan, Wang Lei, Liu Wenting, Xiang Jinwu
2005, 31(12): 1293-1298.
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To analyze the influence of the different spectra loading, constant amplitude loading and crack size on the pre-corrosion influence factor (C(T)),the C(T) test assuming the fatigue life following the two-parameter Weibull distribution was proposed. The C(T) shows the pre-corrosion influence on aircr...
Temperature field analysis for heterogeneous material piston
Wang Su, Ni Chunyang, Zhu Xinxiong
2005, 31(12): 1299-1302.
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Physical and chemical performance of heterogeneous material part exceeds homogeneous material part. Because of material distributing complexity and insufficient study for heterogeneous material, there are lots of difficult in analysis of heterogeneous material part. Theory of composite performance a...
Principle and technique of sand consolidation with novel epoxy-phenolic resins system
Gu Yizhuo, Zhang Zuoguang, Li Min, Zhang Daxing
2005, 31(12): 1303-1307.
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To solve the problem of chemical sand control in low-temperature oil wells cost-effectively, a novel sand consolidation agent was prepared with epoxy resin and phenolic resin as the primary raw material and without any other curing agents by means of the blending method. On the basis of the sand con...
Design of a algorithm of mapping from phase to sine amplitude in DDS of a GPS signal simulator system
Zhu Yuhong, Zhang Qishan, Chang Qin
2005, 31(12): 1308-1311.
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Based on trigonometric identities, Sunderland technique is a effective compression algorithm for mapping from phase to sine amplitude in ROM-based direct digital frequency synthesizers(DDS)design. A modification based on Taylor-series linear interpolation method was proposed to provide additional im...
High accuracy coning compensate algorithm by angular velocity
Wei Xiaohong, Zhang Chunxi, Zhu Kuibao
2005, 31(12): 1312-1316.
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Traditional coning compensation algorithm error greatly increased while angular velocity signal was algorithm input. Considering the direct angular velocity signal output from fibre optic gyroscope (FOG), a novel coning compensation algorithm was introduced and it need input angular velocity signal....
Adaptive threshold method for real-time audio segmentation
Li Chao, Xiong Zhang, Xue Ling, Liu Yun
2005, 31(12): 1317-1321.
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Content-based audio analysis has become an interesting direction for many researchers. Deep analysis on audio signal segmentation was reviewed. Conventionally, automatic segmentation can be implemented by calculating some audio features like short-term energy, amplitude, fundamental frequency or oth...
Thermally-induced birefringence of polarization optical fiber on gyro
Li Jing, Lin Heng
2005, 31(12): 1322-1326.
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To solve the performance labefaction problem of fiber-optic gyroscope (FOG) when its temperature changed, modes coupling caused by thermally-induced refractive index of highly birefringent optical fiber was analyzed to be the main reason of limitting the precision of gyro in theory. Finite element m...
Algorithm of conflict probability prediction for the case of trajectory change
Deng Wei, Zhang Jun, Wu Xian, Wang Gang
2005, 31(12): 1327-1331.
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An algorithm of conflict prediction available for the condition of trajectory change was put forward concerning the problem of how to detect the latent conflict between airplanes in flight efficiently. It calculates the conflict probability to realize the conflict prediction due to the uncertainty o...
Multi-screen display calculation method of GRECO for complex targets
Zhang Yunfei, Ma Jun
2005, 31(12): 1332-1336.
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Graphical electromagnetic computing (GRECO) is an effective method of predicating the radar cross section(RCS) of complex targets, but there must beforehand be a model file from which the shape parameter can be easily obtained. Based on the GRECO, the model file generated by several commercial shapi...
Circuit functional reliability simulation based on grid
Sun Yufeng, Yang Libo, Zhao Guangyan
2005, 31(12): 1337-1341.
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The functional reliability simulation (FRS) is an advanced integrative simulation and analysis technology in reliability by integrating functional simulation with reliability analysis of system. The architecture and functions and mostly realization methods were discussed, such as failure modeling, v...
Taylor series expansion method for vibration system with fuzzy parameters
Qiu Zhiping, Liu Zhengquan
2005, 31(12): 1342-1346.
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To study the eigenvalues problem of vibration structure with fuzzy parameters, the Taylor series expansion method was proposed. Based on the property of membership level, the uncertain fuzzy parameters were expressed in the interval forms, and accordingly the fuzzy finite element equilibrium equatio...
New frequency domain adaptive filtering algorithm
Pu Xiaolin, Li Jingwen
2005, 31(12): 1347-1350.
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After analyzing existing adaptive algorithms,a new frequency adaptive algorithm was proposed which can achieve faster convergence speed under the color noise background. It uses the Newton-type algorithm searching the performance surface and uses the similar structure of recursive least-squares (RLS...
Effects of thickness and environmental factors on conductivity of composite coatings
Song Wenbo, Li Huanxi, Lü Mingyun, Wu Zhe
2005, 31(12): 1351-1354.
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To provide information for the manufacture and application of digital processing frequency selective surface(FSS), the properties of two conductive composite coatings consisting of silver flakes and resin matrix were contrastively investigated. With environmental accelerated test, attention was focu...
Robust PID control for a class of nonlinear systems
Liao Daozheng, Zhang Minglian
2005, 31(12): 1355-1357.
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A robust control design method was proposed for a class of nonlinear systems with uncertainty. The controller was composed of a proportional integral differential (PID)controller and a robust compensator. The whole design was divided into two steps. A PID controller was developed based on the linear...
Influence of damping characteristics to landing gear shimmy
Xiang Jinwu, Yang Dongmei
2005, 31(12): 1358-1362.
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A linear shimmy analysis model was used ,which includes the elasticity of strut, the elasticity of damper linkage system, tire deflection, structure weight, vertical loads and wheel gyroscopic couple. With the method of sensitivity analysis,research on tire-yaw shimmy and structural-torsion shimmy w...

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