NO. DE PÁGINAS: 584

CONTENIDO:

Although the fundamentals of radar have changed little since the publication of the first edition, there has been continual development of new radar capabilities and continual improvements to the technology and practice of radar. This growth has necessitated extensive revisions and the introduction of topics not found in the original. One of the major changes is in the treatment of MTI (moving target indication) radar (Chap. 4). Most ofthe basic MTI concepts that have been added were known at the time ofthe first edition, but they had not appeared in the open literature nor were they widely used in practice. Inclusion in the first edition would have been largely academic since the analog delay-line technology available at that time did not make it practical to build the sophisticated signal processors that were theoretically possible. However, subsequent advances in digital technology, originally developed for applications other Iban radar, have allowed the practical implementation of the multiple delay-line cancelers and multiple pulse-repetition-frequency MTI radars indicated by the basic MTI theory. Automatic detection and tracking, or ADT, is another important development whose basic theory was known for some time, but whose practical realization had to await advances in digital technology. The principIe of ADT was demonstrated in the early 1950s, using vacuum-tube technology, as part of the United States Air Force's SAGE air-defense system developed by MIT Lincoln Laporatory. In Ibis form ADT was physically large, expensive, and difficult to maintain. The commercial availability in the late 1960s of the solid-state minicomputer, however, permitted ADT to be relatively inexpensive, reliable, and of small size so that it can be used with almost any surveillance radar that requires it. Another radar area that has seen much development is that of the electronically steered phased-array antenna. In the first edition, the radar antenna was the subject of a single chapter. In this edition, one chapter covers the conventional radar antenna (Chap. 7) and a separate chapter covers the phased-array antenna (Chap. 8). Devoting a single chapter to the array antenna is more a reflection of interest rather than recognition of extensive application. The chapter on radar clutter (Chap. 13) has been reorganized to include methods for the detection of targets in the presente of clutter. Generally, the design techniques necessary for the detection of targets in a clutter background are considerably different from those necessary for detection in a noise background. Other subjects that are new or which have seen significant changes in the current edition include low-angle tracking, "on-axis " tracking, solid-state RF sources, the mirror-scan antenna, antenna stabilization, computer control of phased arrays, solid-state duplexers, CF AR, pulse compression, target classification, synthetic-aperture radar, over-the-horizon radar, air-surveillance radar, height-finder and 3D radar, and ECCM.