Abstract: A Doppler position locator for determining the bearing of a signal source from a moving receiver. The signal source encodes a digital signal indicating its actual transmitting frequency on a transmitted carrier. The moving receiver such as an airplane receives a Doppler shifted carrier frequency and the digital information on what the actual transmitted frequency was. Comparison of the received frequency to the digital information on the transmitted frequency yields a Doppler frequency (the increase or decrease caused by the relative motion, i.e., the numerical difference between the transmitted and received frequencies). From the aircraft velocity and the two frequencies, the bearing can be determined using the formula .crclbar.=cos.sup.-1 (d*c)/(f*v) where .crclbar. is the bearing angle, f is the transmitted frequency, d is the Doppler shift or change in frequency, c is the speed of light and v is the magnitude of the receiver velocity.

Abstract: In a plasma type display panel of the type having a plurality of parallel row and parallel column electrical conductors forming an array of matrix cross points for providing discrete discharge and light emitting sites upon selection and addressing one or more said sites by selection and addressing circuit means electrically connected to the panel conductors, an improved method and apparatus for providing all or part of the selection and addressing circuit means in one or more high density thick film circuit modules adapted to be detachably engaged with the panel and having conductors thereon in superposed relationship with the parallel panel conductors.