摘要:
For automated visual range measurement by a LIDAR system, a distance measuring range is first determined through repeated evaluation of a voltage level U(R) which indicates the intensity of a threshold value. After random initialization of a start value, the start value is then replaced each time with a new mean visual range, resulting in iterative improvements, and the mean visual range in the determined range is then displayed automatically as soon as the visual range lies within the measuring range of the LIDAR system. Using the Klett method, the accuracy can be determined with the aid of a breaking-off criterion in the form of a threshold value with respect to a deviation percentage between a new and a previous calculation. With this method the deviation can be identified to an order of magnitude of about 10%.
摘要:
For less expensive estimation the impulse response x.sub.MOS of a high-resolution, band-limited radar channel in a radar station operating with an expanded transmitted pulse a(t), from a received signal e, over which a correlated or uncorrelated additive interference signal n can be superimposed, with the use of knowledge about the spread code c and the use of a channel estimator with which a so-called linear, optimum unbiased estimation of the radar channel impulse response x.sub.MOS is performed in a time range covering M range gates of interest, the linear, optimum estimation in the unbiased channel estimator is modified in such a way that the pulse response x.sub.MOS of the band-limited radar channel is determined according to the basic principle of a multiplication of the sampled received signal e and an inverse estimation matrix A.sub.E.sup.-1. The matrix A.sub.E is formed by the extension of the rectangular matrix represented by the components c.sub.i of the spread code c to form a quadratic matrix that circulates to the right, that is, the modified, optimum unbiased estimation: x.sub.MOS =A.sub.E.sup.-1 e applies for a radar channel.
摘要翻译:对于较便宜的估计,雷达站中的高分辨率带限雷达信道的脉冲响应+ E,uns + E,cir x + EE + EE MOS以扩展的发射脉冲+ E,uns a + EE( t),从接收信号+ E,uns e + EE,通过使用有关扩展码+ E,uns c +的知识可以叠加相关或不相关的加性干扰信号+ E,uns n + EE和使用信道估计器,在覆盖M个范围门的时间范围内执行雷达信道脉冲响应+ E,uns + E,cir x + EE + EE MOS的所谓的线性,最优无偏估计 对无偏差信道估计器中的线性优化估计被修改为使得频带限制雷达信道的脉冲响应+ E,uns + E,cir x + EE + EE MOS根据基本原理确定 采样接收信号+ E,uns e + EE和逆估计矩阵+ E,A A + EE E-1的乘法。 矩阵+ E,uns A + EE E由扩展码+ E,uns c + EE的分量+ E,uns c + EE i表示的矩形矩阵的扩展形成,形成循环到 权利,即经修改的最优无偏估计:+ E,uns + E,cir x + EE + EE MOS = + E,uns A + EE E-1 + E,uns e + EE适用于雷达通道 。
摘要:
A current collector for transmitting energy between a contact wire and a motor coach having at least one collector shoe (1) and at least one suspension spring (16) with a positive stiffness, the suspension spring supporting the collector shoe which lies with a contact force from below and against the contact wire. The suspension spring (16) is arranged in parallel with a correction spring (17), the correction spring having a negative stiffness in a zero-crossing of its spring characteristic curve, which coincides with the spring travel of the suspension spring (16), which spring travel corresponds to the desired contact force.
摘要:
In connection with a method for image generation by means of two-dimensional data processing, received SAR data are multiplied by a phase correction (H.sub.mc) for a reference range (r.sub.ref) for the insertion of a motion compensation and for processing at a high drift angle, and an additional cubic phase term is inserted for compensating a range migration. The entire range migration is then eliminated by means of an additional linear frequency displacement; subsequently the SAR data are transformed back into the "range-Doppler" domain. A remaining phase error, created by a "chirp scaling" correction, is corrected, the SAR data are transformed back into the time domain and a phase correction as a function of the range is performed by multiplication for the exact motion compensation in the time domain. The one-dimensional reference function is performed in the frequency domain for azimuth compression, by means of which two-dimensional SAR data are obtained.
摘要:
A circuit arrangement for signal processing of discrete or continuous signals of at least one CCD component, includes a multiplexer which receives the signals for processing and has an output, a pre-amplifier having an input connected to the output of the multiplexer, and further having an output. Two sample and hold circuits are provided that each have an input connected to the output of the pre-amplifier, each of the sample and hold circuits further having an output. An operational amplifier is provided having a non-inverting input connected to the output of a first of the sample and hold circuits, and an inverting input connected to the output of a second of the sample and hold circuits, the operational amplifier further has an output. A digital-analog converter having an output connected to the non-inverting input of the operational amplifier and puts out a correction signal. A multiplying digital-analog converter is provided having a reference input connected to the output of the operational amplifier, the multiplying digital-analog converter further having an output. A third sample and hold circuit has an input connected to the output of the multiplying digital-analog converter, the third sample and hold circuit further having an output. A buffer has an input connected to the output of the third sample and hold circuit, and further has an output connected to the input of an analog-digital converter.
摘要:
In a method for the detection, localization and velocity determination of moving targets from raw radar data from a coherent, single- or multi-channel image system (SAR), for representing the surface of the earth with different backscatter ratios, chronologically successive azimuth spectra are continuously formed during a defined period of time and a frequency shift of the backscatter ratio portion is obtained by determining the position of the maximum of the correlations between respectively two azimuth spectra formed chronologically directly in succession. Then the frequency shifts of the entire raw radar data set are evaluated for producing a frequency shift map.By searching for values deviating from the nominal Doppler rate in the Doppler rate map, a respective moving target is detected and the center of an image of the detected moving target is formed from this.By neglecting its radial acceleration, the tangential velocity of the moving target is determined by means of a Doppler rate taken from the Doppler rate map, and finally the radial velocity of the moving target is determined from the ratio of a length of the moving target in the range direction on the Doppler rate map and the duration of a scanning time by the antenna.
摘要:
A wing made of composite fibre materials, especially carbon fibre reinforced plastics, comprises shell components having a thin-walled, pre-formed wing skin and tubular rods as stringers. The stringers are provided with a connection element and a compression plate at the fuselage end of the wing. The external sides of the compression plates are all in one plane. The wing is attached by screws, which are screwed through the connection element at the fuselage side into the connection elements of the rods forming the stringers. The rods forming the stringers are adhered to the inside of the wing skin. The spaces between the rods may be filled with a light, compression-proof material.
摘要:
An apparatus for the three-dimensional determination of flows has a light source for briefly illuminating a light section (3) and a stereoscopic recording device (10). The stereoscopic recording device (10) comprises two equivalent objectives (11, 12) aligned parallel to each other as well as perpendicular to the plane (22) of the light section (3), and behind the objectives (11, 12) two optical sensor fields (15, 16) aligned parallel to the plane (22). A forward displacement device for the synchronized forward displacement of the projections of the light source (3) onto the two sensor fields (15, 16) has two revolving mirrors (13, 14) aligned parallel and rotating in synchronization about a common axis of rotation (23) as well as in synchronization with the light source, whereby the axis of rotation (23) runs parallel to an imaginary line joining the two objectives (11, 12).
摘要:
A steering system for a road vehicle with front-wheel steering employs microprocessor integrating feedback of the vehicle yaw rate to the front-wheel steering actuator so as to decouple the yaw movement from the lateral movement of the front axle. Sensors measure vehicle speed, yaw rate (by gyroscope), lateral front axle acceleration (by acceleromether at the front axle), and the angle at which the driver holds the steering wheel. The microprocessor controls the front steering actuator according to a formula whose dependent quantities include the sensor outputs, fixed vehicle parameters (such as wheel base), and a preselected time constant. The vehicle's handling changes when the time constant is varied.
摘要:
In a method for manufacturing fibre-reinforced structures with a glass matrix, there is used for the glass matrix an SiO.sub.2 colloid dispersed in water as glass former, with which the fibres are impregnated, and the impregnated fibres are heated in the final form of the structure to the sintering temperature of the SiO.sub.2 colloid.