Introduction to RF Stealth
Providing a new generation of designers with a firm and proven basis for new developments, this book presents and explains first order methods for the design of active and passive stealth properties.
TABLE OF CONTENTS Introduction to RF Stealth
Chapter 7: Signal Processing
7.1 INTRODUCTION TO STEALTH SIGNAL PROCESSING
Stealth signal processing consists of squeezing the maximum performance out of the signal processed, regardless of the amount of "number smashing" that may be required. This includes minimizing straddling losses, reducing RF interference, and limiting self-noise. It also means choosing a waveform that has lowest inherent losses. Furthermore, the output signal-to-noise ratio must be the minimum acceptable, not the best available. Even so, there are inevitably cost-performance trade-offs that must be made, which revolve around word length and total number of arithmetic operations.
7.1.1 Example Signal Processors
The signal processing in a stealth system can be viewed in two ways: the way the hardware is organized and the way the data flows through the functions performed. Two examples of stealth hardware will be given first. Processing hardware consists of low-level RF, signal conditioning, A/D conversion, one or more programmable digital signal processors (PSP), one or more general purpose processors (GPPs) (e.g., your PC), one or more microprocessor control units (MCUs), one or more shared bulk memories (BMs), one or more data busses, control-interface hardware, recording means, and one or more displays. Each unit is "smart" in the sense that it calculates its detailed parameters from general commands or applications software. The hardware requires software: both a real-time operating system (RTOS) and applications programs unique to the system mode.
The first example is of a system that has both an airborne and a ground segment. Systems of this type must be loosely coupled and semiautonomous,...
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