Exploitation of Advanced Waveform Coding Techniques to Enhance Stepped-frequency Radar Performance PDF Download

Author: Kevin L. Sitler (CAPT, USAF.)
Publisher:
ISBN:
Category : Radar targets
Languages : en
Pages :

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Author: G. S. Gill
Publisher:
ISBN: 9781423585169
Category :
Languages : en
Pages : 98

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This report discusses the design and analysis of a step frequency waveform for a surface based radar to detect small targets embedded in clutter. Detection of small targets requires significant reduction in clutter which can be achieved with high range resolution radar with narrow range cell size and Doppler processing. High range resolution with conventional constant frequency waveforms requires high speed A/D with large dynamic range, which is limited by existing A/D technology. However, step frequency allows high resolution with modest A/D requirements. The design of a step frequency waveform is complex due to the conflicting effect of waveform parameters on performance goals. In this report, the design process which determines the waveform parameters for given radar specifications, is systemized. A graphical as well as a computer implementation of the design process is presented. The step frequency waveform is analyzed using the ambiguity function which brings out the characteristics and advantages of the waveform. The ambiguity surface and related diagrams are plotted for specific waveforms of interest.

Author: Fulvio Gini
Publisher: IET
ISBN: 1849192650
Category : Technology & Engineering
Languages : en
Pages : 573

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Book Description
This is the first book to discuss current and future applications of waveform diversity and design in subjects such as radar and sonar, communications systems, passive sensing, and many other technologies. Waveform diversity allows researchers and system designers to optimize electromagnetic and acoustic systems for sensing, communications, electronic warfare or combinations thereof. It enables solutions to problems with how each system performs its own particular function as well as how it is affected by other systems and how those other systems may likewise be affected. It is an excellent standalone introduction to waveform diversity and design, which takes a high potential technology area and makes it visible to other researchers, as well as young engineers.

Author: Dean Francis Rowsell
Publisher:
ISBN:
Category : Coherent radar
Languages : en
Pages : 328

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Author: Mahdi Saleh
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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In various radar systems, a great deal of interest has been paid to selecting a waveformand designing a whole processing chain from the transmitter to the receiver toobtain the high range resolution profile (HRRP). For the last decades, radar designershave focused their attentions on different waveforms such as the pulse compressionwaveforms and the stepped frequency (SF) waveform:On the one hand, three different types of wide-band pulse compression waveforms havebeen proposed: the linear frequency modulation (LFM) waveform, the phase coded(PC) waveform, and the non-linear frequency modulation (NLFM) waveform. They arevery popular but the sampling frequency at the receiver is usually large. This hence requiresan expensive analog-to-digital convertor (ADC). In addition, the PC and NLFMwaveforms may be preferable in some high range resolution applications since they leadto peak sidelobe ratio (PSLR) and integrated sidelobe ratio (ISLR) better than the onesobtained with the LFM waveform.On the other hand, when dealing with SF waveforms, a small sampling frequency canbe considered, making it possible to use a cheap ADC.Pulse compression and SF waveforms can be combined to take advantage of both. Althoughthe standard combination of PC or NLFM with SF leads to the exploitation ofa cheap ADC, the performance of the PC waveform or NLFM waveform in terms ofPSLR and ISLR cannot be attained. As the PSLR and the ISLR have a great influenceon the probability of detection and probability of false alarm, our purpose in the PhDdissertation is to present two new processing chains, from the transmitter to the receiver:1) In the first approach, the spectrum of a wide-band pulse compression pulse is splitinto a predetermined number of portions. Then, the time-domain transformedversions of these various portions are transmitted. At the receiver, the receivedechoes can be either processed with a modified FD algorithm or a novel timewaveformreconstruction (TWR) algorithm. A comparative study is carried outbetween the different processing chains, from the transmitter to the receiver, thatcan be designed. Our simulations show that the performance in terms of PSLRand ISLR obtained with the TWR algorithm is better than that of the modified FDalgorithm for a certain number of portions. This comes at the expense of an additionalcomputational cost. Moreover, whatever the pulse compression used, the approach we present outperforms the standard SF waveforms in terms of PSLRand ISLR.2) In the second approach, we suggest approximating the wide-band NLFM by apiecewise linear waveform and then using it in a SF framework. Thus, a variablechirp rate SF-LFM waveform is proposed where SF is combined with a train ofLFM pulses having different chirp rates with different durations and bandwidths.The parameters of the proposed waveform are derived from the wide-band NLFMwaveform. Then, their selection is done by considering a multi-objective optimization issue taking into account the PSLR, the ISLR and the range resolution.The latter is addressed by using a genetic algorithm. Depending on the weightsused in the multi-objective criterion and the number of LFM pulses that is considered, the performance of the resulting waveforms vary.An appendix is finally provided in which additional works are presented dealing withmodel comparison based on Jeffreys divergence.

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 716

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Author: Mark A. Richards
Publisher: SciTech Publishing
ISBN: 9781839533815
Category : Technology & Engineering
Languages : en
Pages : 0

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Book Description
Principles of Modern Radar: Basic Principles is a comprehensive text for courses in radar systems and technology, a professional training textbook for formal in-house courses and for new hires; a reference for ongoing study following a radar short course and a self-study and professional reference book.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 88

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Book Description
The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.

Author: Bassem R. Mahafza
Publisher: CRC Press
ISBN: 1420066447
Category : Mathematics
Languages : en
Pages : 500

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Book Description
Offering radar-related software for the analysis and design of radar waveform and signal processing, Radar Signal Analysis and Processing Using MATLAB provides a comprehensive source of theoretical and practical information on radar signals, signal analysis, and radar signal processing with companion MATLAB code. Aft

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1032

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