Подробные технологические характеристики

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Operation: Operation of the SSIU-1 is simple and easily learned by the novice operator. The system has two basic modes: direct sequence (DS) and frequency hop (FH). Detection consists of viewing the spectrum analyzer and recognizing the distinctive waveform structures produced by the SSIU-1 when (and only when) a target signal is present. Spread spectrum, symbol rate and hop rate are also easily and quickly determined from the spectrum analyzer presentation. The approach takes advantage of the human operator's inherent capacity for accurately assessing the character of the processed waveform, permitting identification of emanations without triggering false alarms.

Signal Processing: The SSIU-1 uses unique signal processing techniques to transform wideband modulated signals from the receiver IF into very narrowband signals. These processed signals exhibit deterministic and recognizable structures which fully characterize the signals of interest. The resulting outputs are visually presented on a spectrum analyzer and are available for additional processing in an optional host computer.

Capabilities: The SSIU-1, working in conjunction with the R-110B receiver, can detect and characterize virtually all important methods of digital communications, including spread spectrum, even when received at negative signal-to-noise ratios (SNR). Specifically, polyphase phase shift keying (PSK), quadrature PSK (QPSK), staggered QPSK (SQPSK), quadrature AM (QAM), m-ary frequency shift keying (FSK), direct sequence (DS), frequency hop (FH), and their hybrids are supported by the SSIU-1.

The SSIU-1 analog processor provides a substantial amount of processing gain, approximately +42 dB for DS and +55 dB for FH spread spectrum signals. At the same time, the SSIU-1 manipulates the raw spread spectrum intercept into distinctive baseband output signals that are easily recognized and interpreted by a non-technical operator viewing the spectrum analyzer display.