Interference Blanker for Dissimilar Modified Huffman Sequences

Abstract

There are many pulse-coded sequence solutions for a pulse compression design that are available from D. A. Huffman's polynomial approach. If a sequence of length 13 is considered then there are 122 independent sequence solutions for the autocorrelation function of design. Out of this diversity of possible solutions some will be usable because pulse train energy utilization is high. The components of any chosen sequence possess different amplitude and phase excitation values which could be implemented by today's technology. In this paper an "interference blanker" is defined as a device that permits simultaneous operation of two or more pulse compression equipments so that there is no suppression of range resolution accuracy. The pulse compression decoder for the modified D. A. Huffman impulse-equivalent pulse trains is shown to be an " interference blanker" because the cross-correlation function between any two usable sequence solutions shows great variation from the autocorrelation function of design. Because in a practical implementation, there is a limit to the time sidelobe reduction that can be accomplished, D. A. Huffman's zero time sidelobe condition is modified. As an example, the ten most favorable sequence solutions for the time sidelobe level of 32.3 dB and a sequence length 13 are studied.