Bandwidth Partitioned Programmable Matched Filter for 54,000 Time-Bandwidth Product Direct Sequence

Abstract

At proposed design of an all-SAW programmable matched filter for a pseudorandom-coded direct sequence waveform is described. The 200 MHz bandwidth is split into 8 bands 50 MHz wide on 25 MHz centers. Each band is converted down to 100 MHz where the 270 microsecond signal is processed by five cascaded SAW tapped delay lines. Each of the 750-tap transducers in each channel is matched to a segment of a noise-like waveform. Tap polarities are switched by integrated circuit chips. A thick film resistor matrix connects groups of taps with proper weighting to 24 doppler summing lines. After up-conversion, the channel outputs are combined to provide real time outputs on 24 doppler channels. This study was supported by the RADC Electromagnetic Sciences Division, Air Force Systems Command, Hanscom AFB, MA 01731.