Military, Aerospace, Satellite Technology
These courses look at Military and aerospace applications of technologies such as specialized antennas, vacuum tubes, as well as commercial technologies adapted to military use.
Radar sensing has long been an indispensable tool for military surveillance and civil remote sensing. The ability to function day and night, in all weathers and to cover wide areas rapidly means that radar has found wide application from short ranges of a few hundred meters to space based operations. In recent years, radar systems have gone through something of a revolution with the advent of high speed, wide dynamic rage A to D converters and corresponding digital processors. This has led to array based antennas, ultra high range resolution and imaging, advanced adaptive processing for enhanced detection, tracking and target classification. Indeed, radar sensing is continually being extended and new areas such as cognitive sensing and sensing for autonomous applications are set to bring about a further revolution. This course begins by introducing the basic, underpinning concepts that are the foundation of all radar systems. It then builds on this to introduce contemporary methods for moving target detection, array antennas for radar, tracking, high-resolution techniques, imaging and target classification. Throughout the course, real life examples are used to illustrate the key points and ensure that concepts are presented in a realistic and meaningful way.
This course provides a system design approach for wireless digital transceivers, radar, and cognitive and adaptive processes to enhance the designs for both commercial and military sectors, allowing a broad spectrum of readers to understand the topics clearly. It covers a wide range of data link communication design techniques, including link budgets, dynamic range and system analysis of receivers and transmitters used in data link communications, digital modulation and demodulation techniques of phase-shift keyed and frequency hopped spread spectrum systems using phase diagrams, multipath, gain control, an intuitive approach to probability, jamming reduction method using various adaptive processes, error detection and correction, global positioning systems (GPS) data link, satellite communications, direction-finding and interferometers, plus a section on broadband communications and home networking including Link 16, JTRS, military radios, and networking.
Filters are one of the fundamental building blocks used in integrated microwave assemblies, along with amplifiers, oscillators, mixers and switches. Depending on the frequency range and bandwidth we might use printed distributed filters, printed pseudo lumped filters, chip and wire lumped element filters and in some cases, cavity combline filters. Switched filter banks are common and sophisticated multiplexers are used in some systems.
Many broadband microwave down converters and up converters are built using thin-film technology on ceramic substrates. The substrates are placed in a channelized housing which isolates the various signal paths from each other. The front end, band select filters may be as broad as octave bandwidth, while the IF filters are typically much narrower. Filters used to clean up harmonics in the LO chain may be narrower still. It the past decade there has been a trend to use more printed circuit board technology when possible and even use commercial off the shelf (COTS) parts in military systems.
EM simulation is also an essential component of filter design for military systems. Distributed filters in a cut-off waveguide channel excite, and couple to, evanescent modes in the channel. The net result is the measured bandwidth of the filter is radically different with the cover on and the cover off. If the channel dimensions change, the filter must be redesigned. A design procedure that incorporates EM simulation is needed to include all the filter layout details and the coupling of the filter layout to the waveguide channel.
This seminar provides an introduction tutorial on basic Radar design, techniques and operational capabilities. It covers a definition of radar, basic radar fundamentals, types of radars, derivation of the radar equation in multiple forms, radar range equation and range ambiguity, minimal detectable range, signal and noise analysis, MDS, clutter, detection process, probability of detection and false alarm, range accuracy and resolution, range and bearing determinations, radar cross section, displays PPI, Moving Target Indicator MTI, blind speeds, multiple pulse MTI radar, Doppler, multipath, basic radar operation, radar directional antennas including AESAs, transmitters, receivers, frequency and bandwidth advantages and applications, group delay, dynamic range, AGC/STC, frequency diversity, radar path budget, PRI/PRF, , two-way channel losses including free-space loss and examples, and radar pulse shaping. Also included are techniques to use radar systems for communications using PPM and other modulation. In addition, direction finding DF using radar is discussed along with SATCOM radars and frequencies. In addition, several examples and step processes are discussed to determine the optimal solutions and tradeoffs between the many cognitive capabilities.
Transciever course with insight into satellite and military/aerospace applications. Covers military and satellite applications as well as commercial.