Abstract: A bus arbitration method and apparatus for determining which of a plurality of devices desiring access to a common bus will gain access to the bus when it becomes available. Using the change of state of a common BUSY line to synchronize the simultaneous initiation of the arbitration process in each competing device, each device outputs a unique signal to a common arbitration line or lines. Each device monitors the composite signal on the arbitration line or lines and determines its priority relative to other devices. The device with the highest priority gains access to the bus and outputs a signal to the BUSY line until the bus is available for another arbitration.

Abstract: A radar system transmits a signal to a target wherein the frequency is modulated with a sinusoidal modulation pattern. The difference between the actual target range and an estimate thereof is subjected to a spectral analysis wherein the spectral terms are described by Bessel functions. A second order range tracking loop, responsive to the relative magnitudes of the spectral terms, and an estimator of target radial acceleration, responsive to successive values of the spectral terms, provide components of the range estimate.