Performance Evaluation of Compound Barker Codes using Cascaded Mismatched Filter Technique

Abstract

The major advantages of pulse compression are low pulsepower which makes it suitable for solid-state devices, higher maximum range, good range resolution and better jamming immunity. The matched filter is the optimal linear filter for maximizing the signal to noise ratio (SNR) in the presence of additive stochastic noise. Pulse compression is an example of matched filtering. But this matched filter output consists of unwanted but unavoidable side lobes. For multiple-target radar, the side lobes of the compressed pulse must be considered in the system design because of the likelihood of false alarms. At the receiver the signal processor uses weighting filters which are not matched to the transmitted waveform. When this filter is not matched to the transmitted waveform then filter output consists of unwanted but unavoidable side lobes. In this paper a new technique is proposed to suppress the side lobes of radar signals that result from standard matched filtering. This technique produces better peak side lobe ratio than all other conventional side lobe reduction techniques. In simulation the results of this filter technique for compound Barker codes is compared with the other side lobe reduction techniques.

Simulation and Performance Analysis of Chaotic Sequences using Enhanced Cuckoo Search Optimization Method

“…In second half of iterations, the improvement in global search phase is obtained by using (10) where the average of the three solutions is considered which are defined below in (7), (8)…”

“…The role of matched filter and mismatched filter makes it convenient to use in various areas of applications. The design of mismatched filter has been studied from years together by many scientists and engineers [8], [9]. It was studied that the optimization has to be done for the signal whose ACF contains lower peak sidelobes.…”