Programmable PSK Correlators Utilizing Nonlinear SAW Delay Lines.
Final technical rept. 7 Apr 75-31 Jul 76,
UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CONN
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This report describes an experimental and theoretical study of nonlinear tapped delay lines for use in electronically programmable, long code Phase Shift Key PsK signal correlation and encoding. The programmable delay line device studied here, which is called the PSK Diode Correlator, is a hybrid, Integrated Circuit device which utilizes a Surface Acoustic Wave SAW tapped delay line and an attached microelectronic diode and resistor array. PSK signal processing is accomplished at the P diodetaps of the signal processing region of the device by a low power, wide bandwidth, nonlinear mixing process. The design, fabrication and testing of 64 and 128 tap devices are described which utilize lithium niobate delay lines and silicon on sapphire diode and resistor arrays. These devices operate with signal and output frequencies near 70 and 30 MHz respectively and have delay line tap spacing chosen for processing PSK sequences with chip rates equal to, or a multiple of 9.8 MHz. The effect of system errors on the correlation response of a multi-module long code PSK cascade processor is analyzed, and the effect of finite module bandwidth is discussed in a simulated 8 module, 1024 chip cascade correlator.
- Line, Surface and Bulk Acoustic Wave Devices