Abstract: A signal analyzer comprises: a first tuner configured to tune to a first frequency band and to output first tuner data; a memory device configured to store the first tuner data; a spectrum calculator configured to calculate a series of spectra for the first tuner data; a processor configured to determine a presence of a transmission of interest within the first tuner data based on the series of spectra; a second tuner configured to receive the first tuner data stored in the memory device and to tune to a second frequency band including the transmission of interest. The second tuner outputs second tuner data in response to the stored first tuner data. The signal analyzer also comprises a transmission start time detector configured to receive the second tuner data and to determine a start time for the transmission of interest from the second tuner data.

Abstract: A method for establishing bindings in distributed systems is based on a relational characterization interface (RCI) that includes the following fields: ensemble, message type, and variable name. Optional fields may be specified such as time stamp, units, location, and value. The RCI uses explicit representation and standard representations for data and other communication entities to minimize the difficulty in establishing the necessary communication between parts of these systems while maximizing the interoperability properties of the components of these systems. In addition, the interface allows for the use of distributed or collective entities. A variety of services and other supporting methods are enabled by the RCI.

Abstract: The phase response of a network is measured at uniform frequency intervals. A linear regression analysis is performed on samples of the phase response measured at frequencies within an aperture centered on a group delay frequency to obtain an estimate of the group delay of the network at that frequency. The process is repeated for a sequence of group delay frequencies to determine a trace of the group delay of the network across a range of frequencies.

Abstract: The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments are obviated by optimizing filter circuitry and post-processing the IF signal using various techniques to compensate for errors caused by fast sweeping. Some selective windowing is also used to compensate for distortions due to fast sweep rates.

Abstract: The phase response of a network is measured at uniform frequency intervals. A linear regression analysis is performed on samples of the phase response measured at frequencies within an aperture centered on a group delay frequency to obtain an estimate of the group delay of the network at that frequency. The process is repeated for a sequence of group delay frequencies to determine a trace of the group delay of the network across a range of frequencies.

Abstract: The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments are obviated by optimizing filter circuitry and post-processing the IF signal using various techniques to compensate for errors caused by fast sweeping.

Abstract: The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments (10,38) are obviated by optimizing filter circuitry (24,32,34,46) and post-processing the IF signal using various techniques to compensate for errors caused by fast sweeping.

Abstract: The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments are obviated by optimizing filter circuitry and post-processing the IF signal using various techniques to compensate for errors caused by fast sweeping.