Real-time spectrum analysis using hardware Fourier and chirp-Z transformations
Abstract
The paper emphasizes the wide variety of distinct block-schematic approaches to be adopted in analog implementations for real-time spectrum analysis by hardware Fourier and chirp-Z transformations. The discussion covers Fourier analysis by correlation, chirp-Z analysis by correlation, variants of chirp-Z correlation, chirp-Z analysis by matched filtering, matching the chirp waveform with a dispersive delay line, and some features common to chirp-Z (FM) systems. Also examined are Fourier analysis by transversal filter as well as some relevant technologies such as CCDs and SAWs. It is shown that from a theoretical viewpoint quite a wide diversity of apparently distinct types of frequency analyzer are essentially equivalent. Subject to some minor variations, they give the same performance and, more specifically, the same resolution of BT 'lines', for an input covering the bandwidth-time product BT. The choice adopted in any given application depends on relevant engineering requirements and constraints.
- Publication:
-
Radio and Electronic Engineer
- Pub Date:
- February 1979
- Bibcode:
- 1979RaEE...49..101B
- Keywords:
-
- Chirp Signals;
- Fourier Transformation;
- Frequency Analyzers;
- Real Time Operation;
- Signal Analysis;
- Spectrum Analysis;
- Delay Lines;
- Frequency Modulation;
- Frequency Shift;
- Matched Filters;
- Power Spectra;
- Sequential Analysis;
- Time Dependence;
- Electronics and Electrical Engineering