Radio-Electronic Equipment in Civil Aviation: Construction and Maintenance

Book Preface

Safe transportation of people and valuable cargo is the main task of civil aviation at the present time. The complexity of implementing this function in accordance with the established requirements increases sharply in conditions of constantly increasing air traffic intensity and reducing the time to make the right decision.
In these conditions, it is necessary to ensure the accurate and reliable operation of radio navigation, radar and radio communication equipment systems in civil aviation, as well as to ensure their timely modernization.
Radio receivers are one of the main components in the operation of this equipment. It should be noted, that there are currently quite a few such devices. At the same time, the implementation of some of them in civil aviation is limited or even impossible due to economic factors and the lack of an appropriate material base.
The purpose of this book is to familiarize students of higher educational technical institutions of aviation profile, as well as undergraduates and postgraduates with the main types of radio receivers, that are used in the aviation industry.
In the Chap. 1 of the book, the issues of the influence of the electromagnetic environment on the operation of radio receivers are considered. At the same time, much attention is paid to the requirements for the structure and elements of the main receiving channel of the radio receiver.
In the Chap. 2, radio receivers of amplitude-modulated signals are considered, which are widely used in telephone and telegraph radio communication systems, radio telemetry and radio control, primarily due to the simpler implementation of modulation and demodulation devices.
The Chap. 3 of the book is devoted to the problems, associated with the imple-mentation of pulse signal radios, widely used in radar and radio navigation, as well as in radio communication systems. At the same time, much attention is paid to issues, related to the possible distortion of pulse signals.
The Chap. 4 is devoted to the functioning of radio receivers with angular modu-lation. At the same time, much attention is devoted to the description of the methods of noise immunity of these devices. The principles of obtaining a coherent reference vibration in the presence of a carrier in the received signal are described.

The Chap. 5 of the book deals with issues, related to the functioning of long-range radio receivers, designed to receive radio signals in the frequency range, exceeding their bandwidth. Such devices include receivers of communication systems, receivers of radio engineering systems, using multi-frequency signals, panoramic, measuring radio control systems, etc. The main attention in this chapter is paid to the methods of setting up such receivers and describing the features of their structural schemes.
In the Chap. 6, receivers of optical systems are considered. At the same time, much attention is paid to their characteristics, structural diagrams and description of noise sources in such devices. A comparative evaluation of optical receivers was carried out.
The Chap. 7 of the book examines the measurement of the main characteristics of radio receivers, including sensitivity and distortion of signals. At the same time, issues, related to automatic gain control, frequency control and automation of testing are considered.
The textbook is based on lectures, given by the authors at the St. Petersburg State University of Aerospace Instrumentation and at the Moscow State Technical University of Civil Aviation.