Synthesis of multilevel and binary sequences with good correlation properties

In radar systems the very low side lobes that can be achieved with amplitude and phase modulated pulse trains especially particularly in systems requiring a large dynamic range. Moreover, the excellent self-clutter rejection performance is obtained without sacrificing the ability for the separation...

Full description

Saved in:

Bibliographic Details
Main Author:	Siti Julia, Rosli
Format:	Thesis
Language:	English
Subjects:	Radar systems Radar waveform Signal processing Pulse train Radar signals
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44111/1/p.1-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44111/2/full%20text.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-unimap-44111
record_format	uketd_dc
spelling	my-unimap-441112016-11-22T04:31:19Z Synthesis of multilevel and binary sequences with good correlation properties Siti Julia, Rosli In radar systems the very low side lobes that can be achieved with amplitude and phase modulated pulse trains especially particularly in systems requiring a large dynamic range. Moreover, the excellent self-clutter rejection performance is obtained without sacrificing the ability for the separation of close targets (no main lobe widening). The additional expense of encoding and decoding in amplitude and phase may be justified for radars that must cope with land clutter or operating in a dense-target environment. To choose a suitable transmit waveform is an important problem in radar design. This is so because, the waveform controls resolution, clutter performance and also bears heavily on the system cost. Theoretical studies which provide the basis for technical advances have not so far solved the general signal design problem. The knowledge about the properties of the pulse trains shows that, a class of signals particularly well suited to digital processing of increasing practical importance. Two properties of such sequences are of interest. One is the energy ratio (ER) defined as the ratio of the total energy of the sequence to the energy of the largest pulse. The other property is the total side lobe energy (SLE) which is the energy in the side lobes of the autocorrelation function of the sequency. The work presented in this research is mainly concerned with the synthesis of multilevel and binary waveform of any desired length that has high energy ratio and low side lobe in their autocorrelation function (ACF). For the design of multilevel sequences in iterative technique is proposed, this techniques employed the properties of optimum inverse filtering and shown to be effective for the generation of multilevel sequences in any desired lengths. The method of clipping proposed in this research converts a multilevel sequence to binary sequence in same lengths while it is still retaining at low side lobe in autocorrelation function. It is shown that the iterative method based on inverse filtering and the method of clipping provide effective techniques for the generation of multilevel sequences that have high energy ratio and low side lobe energy in their autocorrelation function. Such sequences can then be effectively used to improve the range and Doppler resolution of radars. Universiti Malaysia Perlis (UniMAP) 2013 Thesis en http://dspace.unimap.edu.my:80/xmlui/handle/123456789/44111 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44111/3/license.txt 8a4605be74aa9ea9d79846c1fba20a33 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44111/1/p.1-24.pdf 60787222b725834586a926d7ed81fe94 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44111/2/full%20text.pdf e95381bd438e94f2f57c95a49d3b6a0e Radar systems Radar waveform Signal processing Pulse train Radar signals School of Computer and Communication Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
topic	Radar systems Radar waveform Signal processing Pulse train Radar signals
spellingShingle	Radar systems Radar waveform Signal processing Pulse train Radar signals Siti Julia, Rosli Synthesis of multilevel and binary sequences with good correlation properties
description	In radar systems the very low side lobes that can be achieved with amplitude and phase modulated pulse trains especially particularly in systems requiring a large dynamic range. Moreover, the excellent self-clutter rejection performance is obtained without sacrificing the ability for the separation of close targets (no main lobe widening). The additional expense of encoding and decoding in amplitude and phase may be justified for radars that must cope with land clutter or operating in a dense-target environment. To choose a suitable transmit waveform is an important problem in radar design. This is so because, the waveform controls resolution, clutter performance and also bears heavily on the system cost. Theoretical studies which provide the basis for technical advances have not so far solved the general signal design problem. The knowledge about the properties of the pulse trains shows that, a class of signals particularly well suited to digital processing of increasing practical importance. Two properties of such sequences are of interest. One is the energy ratio (ER) defined as the ratio of the total energy of the sequence to the energy of the largest pulse. The other property is the total side lobe energy (SLE) which is the energy in the side lobes of the autocorrelation function of the sequency. The work presented in this research is mainly concerned with the synthesis of multilevel and binary waveform of any desired length that has high energy ratio and low side lobe in their autocorrelation function (ACF). For the design of multilevel sequences in iterative technique is proposed, this techniques employed the properties of optimum inverse filtering and shown to be effective for the generation of multilevel sequences in any desired lengths. The method of clipping proposed in this research converts a multilevel sequence to binary sequence in same lengths while it is still retaining at low side lobe in autocorrelation function. It is shown that the iterative method based on inverse filtering and the method of clipping provide effective techniques for the generation of multilevel sequences that have high energy ratio and low side lobe energy in their autocorrelation function. Such sequences can then be effectively used to improve the range and Doppler resolution of radars.
format	Thesis
author	Siti Julia, Rosli
author_facet	Siti Julia, Rosli
author_sort	Siti Julia, Rosli
title	Synthesis of multilevel and binary sequences with good correlation properties
title_short	Synthesis of multilevel and binary sequences with good correlation properties
title_full	Synthesis of multilevel and binary sequences with good correlation properties
title_fullStr	Synthesis of multilevel and binary sequences with good correlation properties
title_full_unstemmed	Synthesis of multilevel and binary sequences with good correlation properties
title_sort	synthesis of multilevel and binary sequences with good correlation properties
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Computer and Communication Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44111/1/p.1-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44111/2/full%20text.pdf
_version_	1747836821725773824

Synthesis of multilevel and binary sequences with good correlation properties

Similar Items