Patent ID: 8610621
Filing Date: 2013-12-17
Classification: G01S

Abstract:
1. A method for transmission and detection in an adaptive-on-transmit (AT) system operating in the electromagnetic spectrum, the method performed on a processor and comprising the steps of: identifying and selecting an input binary code of length M; determining a waveform-filter pair (K′,M) by deciding filter length K′ as an entire multiple of M based on an a-priori desired auto-correlation function sidelobe level reduction, out-of-band spectral suppression, and frequency spectrum power tail power decay, wherein the same are parameterized as a function of K′ and solvable a-priori for real-time AT system performance; determining an intermediate code s″ with length K′ and formed by interleaving an original code s, a skew-symmetrical flipped version of s, and a symmetrical distribution of (K′−M) null elements that zero-pads a start and end of s″; determining an extended code q′ by using a transformation matrix A, wherein q′ results in a symmetrical and spread-out sidelobe distribution of a resultant cross-correlation function of the outcome code q; and employing the waveform-filter pair in transmission and detection; and wherein two or more are provided of the group consisting of an auto-correlation function sidelobe level reduction proportional to a the filter length, K, or better, an out-of-band spectral suppression of at least about 40 dB, and a frequency spectrum power tail power decay of K