By ZDEBEJ TITZ
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38 Settling of frequency hopped signal. Fast hopping FH transmitters create a much higher level of transmission security than slow hoppers, but they can be expected to require much faster hopping synthesizers. At extremely high tuning speeds, “direct synthesizers” may be required. They are more complex than phase lock loop synthesizers. 39. 39 Direct synthesizer. Switching matrix Digital frequency command Local oscillator signal Communications Signals 41 desired output frequency. The mixer outputs the input frequencies and the sums and differences and harmonics of all input frequencies.
The code that is used to spread the signal is required to collapse the signal back to its prespread bandwidth. 28, there is a synchronization scheme common between transmitters and their intended receivers that allows the same code to be used and to keep the transmitter and receiver codes in phase with each other. Once the signal is despread, it can be demodulated in the appropriate, narrow bandwidth in which it has a high signal-to-noise ratio. Thus, the spreading process is transparent to the intended receiver.
The LPI technique combinations are: • Direct sequence spread spectrum and frequency hopping; • Chirp and direct sequence spread spectrum; • Frequency hopping and chirp. 48 EW 103 Signal strength There are also “time hopping” techniques, although these are not typically for transmission security. They provide multiple time slots so that multiple users can independently communicate over the same communication network. The most common combination LPI approach is direct sequence with frequency hopping.