Detection of angular modulated electromagnetic signals
Abstract
A signal processing circuit which operates on a spread spectrum received signal to compress it into a waveform of sufficient amplitude to allow detection by conventional means. The received signal is filtered and split onto two paths, each path being mixed with an upper or lower single sideband created by an oscillator and modulator combination. The output of each mixer is filtered and mixed together in a third mixer, the resultant output of which is fed through a narrow bandpass filter to a conventional signal detector.
- Publication:
-
Air Force Interim Report
- Pub Date:
- December 1984
- Bibcode:
- 1984aifo.reptR....V
- Keywords:
-
- Angles (Geometry);
- Bandpass Filters;
- Detection;
- Electromagnetic Radiation;
- Mixing Circuits;
- Modulators;
- Signal Detectors;
- Signal Processing;
- Signal To Noise Ratios;
- Spread Spectrum Transmission;
- Bandwidth;
- Oscillators;
- Patents;
- Radar Equipment;
- Single Sideband Transmission;
- Communications and Radar