最新刊期
卷 ， 期 4 ， 1985
- 摘要：The radar signal design and signal processing are investigated comprehensively to obtain the optimum statistical pulse compression characteristics （SPCC）. First, the SPCC of a code set with L codes is studied that is obtained by truncating a cyclic PN code in a fixed step length with the truncated length L being equal to the code length of the cyclic PN code and transmitted in turn to implement the code agile in pulse-to-pulse （CAPP）. The general expressions of SPCC for the kind of codes mentioned above are derived. The peak ratio of main-lobe to side-lobe （RMS） of SPCC within the pulse repetition period （PRP）, refered to as RMS in the near region, is greater than L, but is very small outside the PRP which is refered to as RMS in the far region. Next, in order to improve the RMS of SPCC in the far region for the code set mentioned above, a code set truncated from a cyclic PN code in a stochastic step length is proposed with the truncated length L. Although these agile codes have a good RMS of SPCC in the far region compared with previous one, however, the agile fashions in this manner are very few than that in a fixed step length. Finally, a new kind of pulse-to-pulse agile codes （NKPPAC） and their SPCC are investigated by means of the computer simulation. The RMS in the near region for the NKPPAC is the same with that one the truncated PN code set had given, and in the far region is also greater than L except a very few code sets with particular code length L in the particular agile step length. Even so in the last case the difference of RMS of SPCC in the far region from L is also very small. If the code length L is sufficiently large, the high RMS of SPCC required can be achieved without weighted processing. This will lead to simplify the hardware for engineering implementation. It is proved by the hardware experiment that the generators of this NKPPAC are very simple, which is expected for engineering applications.2|29|5更新时间：2025-12-08
- 摘要：A new method of deconvolution in the time domain is proposed, and compared with two traditional methods of deconvolution （Fourier transform method and Z transform method）. The results show that these traditional methods are the special cases of the new method, and the new method can overcome the difficulties of using traditional methods to do deconvolution. Only discrete case is concerned in the paper.4|400|35更新时间：2025-12-08
- 摘要：The eigenvalue problem of a waveguide partially filled with anisotropic dielectric material is analysed. The variational expressen of the electromagnetic field is derived. This expression is discretized by using the finite element method, and a general algebraic eigenvalue problem is obtained and evaluated. On this basis, a finite element computer program is written. Dispersion curves and field plots of several circular and rectangular anisotropic dielectric material rod loaded waveguides are given and compared with the results obtained by other method.2|121|7更新时间：2025-12-08
- 摘要：A new theoretical method of analysing open waveguide resonators is given. In order to overcome the difficulty caused by different boundary conditions on the each end of the cavity an unknown separation surface of fields is set up in this method. The analytical solutions of the fields including diffraction output power are obtained in this way. All the theoretical results reached satisfactory agreement with experiments.2|148|1更新时间：2025-12-08
- 摘要：In order to study the inherent relations for most of often-used patterns and find new patterns, a new synthesis technique-Taylor Pattern Family （TPF） for aperture antennas is developed. The TPF are introduced and its zeros are corrected by the conventional Taylor Pattern. For the TPF, its constructions, fundamental pattern family and visual coordinates （S, α1, α2） are discussed. The new parameter α1 and the corrected a are of importance to the analysis and synthesis of monopulse antennas for low sidelobes. Two examples of the TPF are described final.2|34|0更新时间：2025-12-08
- 摘要：Based on the dynamic Van der Pol nonlinearity model, the 2-nd and 3-rd harmonic oscillators are studied using the describing function method. The electrical characteristics and tune sensitivity of the fundamental frequncy and harmonic loops under the optimum conditions are discussed. The basic principles for designing the harmonic oscillator are proposed. And a new circuit model with good tunity and the highest output power is given.3|52|7更新时间：2025-12-08
- 摘要：A new class of analog active filters using OP amps, ratios of capacitors and ratios of resistors is presented. They are active C filters containing independent groups of resistors. The theory and approaches for realizing this new class of filters are discussed. Two filters are designed and analysed and its experimental results are given.2|14|2更新时间：2025-12-08
- 摘要：For the Purpose of studying the mechanism of lowering breakdown voltage in the new type（Tian Jin type） He-Ne Laser, three kinds of tubes （the common type, the new type I and new type I） were made and breakdown voltage measurements were performed in several gases （He, Ne, He-Ne, Ar, Kr, H2, and N2）. The experimental results show that the breakdown voltage for the new types is fairly lower than the common one, but this effect occurs only within a definite range of gas pressure. As the pressure increases to a certain value P0, which depends on what gas is used, the lowering effects vanish. A theoretical explanation for the experimental results is given.2|30|2更新时间：2025-12-08
- 摘要：The scattered field from the subreflector, the secondary radiation patterns and the efficiency of (he shifted focal axis antenna are analysed by means of spherical wave expansions etc. diffraction theories. The calculated results are in good agreement with the experimental one, and show that these formulas are effective for the engineering design.2|29|0更新时间：2025-12-08
- 摘要：A new technique for directly designing bilinear switched-capacitor filter using signal-flow graphs and the two-integrator-loop is described. This simple and flexible method is applicable to all types of SCFs. The resulting circuits have low sensitivities both to eleme-ntvalue variations and to parasitic capacitances.2|68|5更新时间：2025-12-08
- 摘要：Bulk Wave Quartz Crystal Resonators at Fundamental Frequencies 700-1100 MHz, prepared by ion beam milling, are reported.The Parameters of seven resonators are given. The lowest undamental frequency is 712MHz and highest 1159MHz, with the third overtone being 3.48GHz. These resonators have low equivalent resistances, high Q and Qf values, good frequency response and satisfactory mechanical characteristics.2|23|1更新时间：2025-12-08
- 摘要：The problem that likelihood ratio principle is adaptable to various maneuvering forms of the maneuvering targets . is solved, and the likelihood ratio or the likelihood function can be computed in real time. Thus, the application software is formed for decision and filtering of maneuvering targets based on the likelihood ratio principle, and has been applied to C2 systems. The results show that the method has greater advantages than the generally used decision method based on variances of distance.2|15|0更新时间：2025-12-08
- 摘要：The field expressions of eleven lower modes in the elliptic cavity are obtained. The field charts are drawn and their responsive wavelength and Q-factor are calculated. A lot of concerning curves are obtained by way of dealing with Methieu function, and some good results are obtained.2|92|2更新时间：2025-12-08
- 摘要：The advances in the theory of 2-D digital filtering in recent years are reviewed. 2-D nonrecursive and recursive digital filters are presented, the discussions on their design and implementation are made spearately. Several approaches of testing the stability are treated for 2-D recursive filters. 2-D Kalman filter and it’s implementation are discussed briefly.2|104|3更新时间：2025-12-08
- 摘要：A common formula of the synchronizing band ΔW（s/M）max of the rational harmonic injection locking （RHIL） is derived and analysed, and it is shown that the formula given by Reference [2] is only its special case. A method is presented for spreading the RHIL’s synchronizing band with full-pass network. Using the method, a 2/3 injection-locking VHF divider mode of IC FZ1C is developed, with a stability factor n = Δf （3/2）max/Δf-40-85*c ≥4. For the original circuit, n≈0.6. RHIL thus has more practical value of application.2|21|1更新时间：2025-12-08
- 摘要：I-V characteristics of InGaAsP/InP DH LED’S are investigated, especially the dependence of Vf, V0 and VB on the active layer’s acceptor concentration, the location of the p-n junction, the dopant for the p-InP confining layer, the heat sink temperature and the fabrication techniques, as well as the dependence of I-V characteristics on the light output power and the spectral characteristics. Reasons are explained for the devices having different I-V characteristics.2|37|1更新时间：2025-12-08
- 摘要：It is shown that the arched-clutter phenomenon is caused by two factors: the antenna steady-state sidelobes can cause the clutter of larger spots on the PPI in a narrower angular region, and the transient process in the end-fed antenna excited with a pulse signal can cause the clutter of smaller spots in a wider angular region.2|12|0更新时间：2025-12-08
- 摘要：A new active filter with one capacitor, one operational amplifier and two resistors is presented. The circuit of this filter is simple, pole-Q of the filter can independently be adjusted and characteristics of the filter is excellent.2|43|5更新时间：2025-12-08
- 摘要：An adaptive OP-DτVCA constant amplitude method to suppress interference pulse in radio receivers is presented. It is proved that the method not only can compress its input dynamic range but also can suppress high level interference pulse. It is better at medium frequency than the blanker method to suppress interference pulse in radio receivers.2|12|0更新时间：2025-12-08
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