Low probability of intercept (LPI) radars utilize specially designed waveforms for intra-pulse modulation and hence LPI radars cannot be easily intercepted by passive receivers. The waveforms include linear frequency modulation, nonlinear frequency modulation, polyphase, and polytime codes. The advantages of LPI radar are wide bandwidth, frequency variability, low power, and the ability to hide their emissions. On the other hand, the main purpose of intercept receiver is to classify and estimate the parameters of the waveforms even when the signals are contaminated with noise. Precise measurement of the parameters will provide necessary information about a threat to the radar so that the electronic attack or electronic warfare support system could take instantaneous counter action against the enemy. In this work, noisy polyphase and polytime coded waveforms are analyzed using cyclostationary (CS) algorithm. To improve the signal quality, the noisy signal is pre-processed using two types of denoising filters. The denoised signal is analyzed using CS techniques and the coefficients of spectral correlation density are computed. With this method, modulation parameters of nine types of waveforms up to −12 dB signal-to-noise ratio with an accuracy of better than 95% are extracted. When compared with literature values, it is found that the results are superior.

Professor David Barker, CBE, FRS, made an enormous contribution to biomedical research, which helped to change its direction and assisted translation to clinical medicine in the area of non-communicable disease (NCD). In this paper, I briefly note some of the studies, which led to his work, and describe how the underlying mechanisms came to be investigated by fetal physiologists. This is a unique aspect of the change in scientific emphasis, from a gene-centric and adult lifestyle view of NCD to a more holistic perspective, which placed emphasis on the importance of development that took place in the late 20th century. Early this century, the DOHaD Society was formed: I discuss some aspects of the formation of the Society and note the important role it is now playing in addressing the need to find early-life interventions to reduce NCD. This forms part of the unique legacy that David Barker has left to science and medicine.

This article seeks to reappraise the scholarly work of Bede Jarrett OP by drawing out his debt to Sir Ernest Barker. A shared interest in medieval political and social institutions, and in the constitution of the Dominican Order as a model of voluntary association, infused Jarrett's thinking with the tenets of English political pluralism and enabled him to produce a body of work that paid as much attention to concrete political form as to social ethics. As such his work establishes links with nineteenth and early twentieth-century Christian Socialism, as well as echoing certain current preoccupations within political theology.