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International Journal of Antennas and Propagation
Volume 2015, Article ID 297823, 11 pages
http://dx.doi.org/10.1155/2015/297823
Research Article

Estimation of Sidelobe Level Variations of Phased Codes in Presence of Random Interference for Bistatic Wideband Noise Radar

1The Signal Theory and Communication Department, University of Vigo, 36310 Vigo, Spain
2The Klipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, NM 88001, USA
3Texas Instruments Inc., Dallas, TX 75243, USA

Received 22 July 2014; Accepted 3 November 2014

Academic Editor: Yong Bae Park

Copyright © 2015 Ana Vazquez Alejos et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We discuss the importance of using the sidelobe level of the cross-correlation function as a criterion to implement a noise radar based on the transmission of wideband binary waveforms. Theoretical expressions are introduced for the parameters Peak-Sidelobe, Secondary-Sidelobe, and Integrated-Sidelobe levels for both Golay and pseudorandom binary sequences in presence of additive white Gaussian noise, relating the sequence length to the spectral power of the interfering noise. These expressions offer a valuable method for adaptive radar waveform design in order to determine sequence requirements which allow facing the noise present in the frequency band of interest. We also show a comparison of the ambiguity functions for Golay and PRBS sequences to analyze their performance in terms of Doppler and range accuracy. We describe a practical implementation of a pseudonoise waveform-based bistatic radar with reduced sidelobe level due to the use of Golay codes in combination with single side band modulation and operation at UHF band. Experimental measurements were performed in actual scenarios for ranging test of single and double targets. Linear polarizations were combined with different length sequences to determine their influence on the sounder performance under field test conditions.