Abstract: A traveler safety information correlation system is provided. An interactive, real-time mapping tool is combined with traveler location and alert information data sources. Recorded locations corresponding to human assets are overlaid on geographical maps enabling an operator to determine real or near real-time locations of human assets, such as an organizations employees. Traveler location information may obtained from computerized reservation systems, credit card processing systems, cellular and wireless computer networks, and/or other systems. The traveler safety information correlation system may also be used to generate alerts and to deliver information messages to human assets.

Abstract: A method for removing direct current (DC) interference from a signal received by a communication receiver is provided that removes both a DC offset signal induced by the communication receiver and transmitter. The method includes removing the estimated DC offset from the received signal, correcting a frequency shift in the received signal, estimating a second DC offset signal induced by a source of the received signal, such as a transmitter and removing the estimated second DC offset from the received signal. The receiver DC offset signal is estimated and removed prior to performing a timing carrier offset correction using Barker code manipulation to remove receiver-induced DC offset interference and to sum all Barker chips after effectively multiplying Barker codes to correlate to a Barker sequence unaffected by the receiver DC offset signal.

Abstract: A receiver (100) includes an input, a correlator (112), a phase-assisted demodulator (116), and an output. The input receives a modulated signal (102) and the correlator (112) generates a plurality of correlation values (114) from the received modulated signal (102). The phase-assisted demodulator (116), coupled to the correlator (112), selects one of the plurality of correlation values based on relative magnitude and relative phase information of at least a two of the plurality of correlation values. The output provides a demodulated signal (124), corresponding to the modulated signal (102), based on the selected one of the plurality of correlation values. The correlation value (11) having the largest magnitude and the correlation value having the second largest magnitude is used in combination with the relative phase information of both correlation values in determining which correlation value corresponds to the correct demodulated symbol.

Abstract: A method for removing direct current (DC) interference from a signal received by a communication receiver is provided that removes both a DC offset signal induced by the communication receiver and transmitter. The method includes removing the estimated DC offset from the received signal, correcting a frequency shift in the received signal, estimating a second DC offset signal induced by a source of the received signal, such as a transmitter and removing the estimated second DC offset from the received signal. The receiver DC offset signal is estimated and removed prior to performing a timing carrier offset correction using Barker code manipulation to remove receiver-induced DC offset interference and to sum all Barker chips after effectively multiplying Barker codes to correlate to a Barker sequence unaffected by the receiver DC offset signal.