This book is devoted to the description of optimum signal processing algorithms which can find useful applications in radar systems. The monograph collects about twenty papers written by the Editor and his colleagues. Structurally the collection of the papers is divided into four parts. The first describes the adaptive cancellation techniques of radar clutter; the second part addresses the challenging problem of finding the optimum detection schemes to deal with target and clutter signals having non-Gaussian probability density function, and any type of autocorrelation function. The third group of papers considers the problem of finding the optimum detection schemes for the case of netted multi-static radar systems. The last part is concerned with more general processing techniques used in radar systems for surveillance. The aim of this text is to provide a theory of radar signal processing at a level which can be useful to practising radar engineers for analysis and design purposes. The relevance and modernity of the topics described ensure that the book can also be used with benefit for specialised graduate courses in communications and electronic engineering at universities and colleges as well as in continuing education courses for graduate employees in industry.