Explores German cinema's enthusiasm for and anxiety about the blurring of postwar cultural boundaries

Basic cross-correlation and spectrum analysis type noise radars are defined and analyzed. Inherent undesirable characteristics of the basic spectrum analysis type radar are discussed. A modification of the spectrum analysis radar that removes most of these undesirable characteristics is described and evaluated. A new spectrum analysis system designed to detect moving targets is presented. Comparison is made of the detection capabilities of all four noise radar systems in the presence of extraneous noise. (Author).

Phased array antennas and doppler signal processors designed to complement each other have been successfully used to maximize the signal-to-clutter (S/C) performance of AMTI radars. The optimum receiving antennas described in this paper allow for nonuniformities created in the ground-clutter doppler spectrum by the transmitting antenna and processing of the received doppler signal; the optimum signal-to-clutter digital processors allow for clutter spectra shaped by the combined effects of the transmitting-receiving antennas. The emphasis has been placed on producing antenna-processor designs that have complementary pass and reject bands. The mathematical techniques used in these designs maximize the ratio between the target signal and the clutter-plus-noise, expressed as a ratio of quadratic forms. The solution for the optimum design, which depends principally on the inversion of a single matrix rather than on any recursive technique, is obtained in closed form.

A novel radar technique is proposed for detecting the presence of a target having a priori known frequency-dependent scattering properties. The target coexists with a large collection of clutter elements having random scattering properties and ranges. Assuming a wideband random signal excitation, the power spectrum of the scattered field consists of the target return having an a priori known frequency behavior embedded in a clutter return having a random frequency dependence. On an ensemble average basis, the clutter appears as additive noise from which the existence of a prescribed target return must be extracted.

A novel technique for detecting, locating, and tracking moving targets from an airborne radar platform is described and analyzed. The technique uses the generally dissimilar linear doppler frequency modulated signals from moving targets and stationary ground clutter. A matched filter processor is defined and its resolution and ambiguity properties studied as function processor parameters. Sub-clutter visibility of the processor is then determined. Two techniques for digitally implementing the processor are discussed and the computational efficiencies briefly analyzed. Finally, target angular position can be determined using phase monopulse. It is then shown that target velocity--both ground speed and target heading--can be determined from radar observables. (Author).

Recent papers have emphasized the linear systems aspect of the electromagnetic scattering from a stationary, discrete target. They show that the temporal response of the far-zone scattered field is the convolution of the temporal impulse response of the scatterer with the waveform of the illuminating plane wave. In this paper the scattering system response to an illuminating waveform which is a broadband, temporally stationary random process is discussed. As expected from the classical theory of the noise response of linear systems, the crosscorrelation properties of arbitrary components of the scattered field at two space-time points can be determined from the temporal autocorrelation function of the illuminating waveform and the appropriate target impulse responses. A consideration of the power spectral density of the bistatic scattered field at a large range r from the target leads to an alternate interpretation of the target scattering cross section. It may be thought of as 4 pi r square times the power spectral density of the bistatic scattered field when the target illumination is white noise. By analogy with the classical definition of the bistatic scattering cross section for monochromatic excitation, one can define the effective scattering cross section of a target for broadband illumination. The effective cross section is proportional to the integral over all frequencies of the classical cross section weighted by the power spectral density of the illumination. The effective bistatic cross sections of various targets in the Rayleigh and optics regions are exhibited and compared with the classical bistatic cross sections. (Author).