Abstract: A communication system for providing reliable transfer of digital data in such system as a security system between source of data 214 and user 213, and between user 213 and end use of data 215. When the false alarm rate requirement of the security system is specified in less than one in ten years, this tight requirement must also apply to the communication link even though the RF transmission path might use the very noisy 60 Hz power line. Digital data signals are transmitted only when a detection is made at source of data 214 or when user 213 outputs an action command to end of use data 215. Thus the communication system must maintain the low false alarm rate under two conditions: (1) where no data signal but noise and interference is received over long periods of time, and (2) where a data signal pulse noise is received.

Abstract: Detectors (11a-d) are located at a plurality of locations and include go, no-go decision processor apparatus for subjecting outputs of the detectors (11a-d) to a go, no-go decision process. First signal generator and transmitter apparatus (12a-d) are interconnected to said go, no-go decision processor apparatus for generating and transmitting signals responsive to the output of said go, no-go decision processor apparatus, the signals being transmitted in a wave form configured to maximize differentiation from noise and interference. First data receiver apparatus (13) receives the signals from said first signal generator and transmitter apparatus (12a-d) and includes wave form recognition apparatus. A reprogrammable central processor apparatus (14) is interconnected to the data receiver apparatus (13) for providing action outputs representative of one or more actions to be taken in response to one or more signals received from the first data receiver apparatus (13).

Abstract: Detectors (11a-d) are located at a plurality of locations and include go, no-go decision processor apparatus for subjecting outputs of the detectors (11a-d) to a go, no-go decision process. First signal generator and transmitter apparatus (12a-d) are interconnected to said go, no-go decision processor apparatus for generating and transmitting signals responsive to the output of said go, no-go decision processor apparatus, the signals being transmitted in a wave form configured to maximize differentiation from noise and interference. First data receiver apparatus (13) receives the signals from said first signal generator and transmitter apparatus (12a-d) and includes wave form recognition apparatus. A reprogrammable central processor apparatus (14) is interconnected to the data receiver apparatus (13) for providing action outputs representative of one or more actions to be taken in response to one or more signals received from the first data receiver apparatus (13).

Abstract: Display system capable of rapidly presenting three dimensional information ith a minimum of signal-to-noise degradation and particularly suitable for use in a high performance radar system. Three two-parameter display units present information on cathode ray tubes which include deflection circuits driven by main and auxiliary staircase sweep generators.

Abstract: A signal processing arrangement which discriminates against large-amplitude nterference signals and in favor of information signals. Incoming signals are separated into a plurality of contiguous frequency channels whose total frequency coverage is the frequency band of interest. The signals in the individual channels are then amplitude limited so that relatively narrow band interference signals are limited while a wide band desired signal is not. The desired signal is then spectrally compressed to obtain a high amplitude signal while the remaining interference signals are spread and rejected.

Abstract: A single filter to replace a set of parallel filters in an O-T-H radar coising a prelimiting filter connected to amplifying and limiting means and quenching means for shorting out said prelimiting filter at appropriate times. The prelimiting filter is connected to receive the output of the mixer of one range bin of the velocity-and-acceleration analyzer of the radar and the predetection filter of the analyzer receives the output of the amplifying and limiting means. The quenching means also receives the output of the amplifying and limiting means and provides a quenching signal to the predetection filter.