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Narrowband and wideband ambiguity functions for selected Barker binary pahse codes

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Naval Postgraduate School , Monterey, California
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Narrowband and wideband ambiguity functions for selected Barker binary pahse codes. Item Preview remove-circle Share or Embed This Item. EMBED. EMBED (for hosted blogs and item tags) Want more. Advanced embedding details, examples, and help. No_Favorite. share Pages: Approved for public release; distribution is unlimitedThe Barker binary phase codes have the interesting property that the magnitude of the range sidelobes never exceeds 1/N, where N is the code : John Phillip Kjellander.

ST—— UNCLASSIFIED ANINVESTIGATIONOFTIE NARROW-BANDANDWIDEBAND AMBIGUITYFUNCTIONSFORCOMPLEMENTARYCODES by Richard.'litsuoAkita Lieutenant,UnitedStatesNavy B.S. On the Fractional Wideband and Narrowband Ambiguity Function in Radar and Sonar Article (PDF Available) in IEEE Signal Processing Letters 13(9) - October with 85 ReadsAuthor: Brett Borden.

Figure 1 Graphical Representation of Binary phase coded waveform Barker Codes Barker code is a special type of binary code, which belongs to a class of sophisticated signal. The binary phase coded sequence of 00 0, values that result in equal sidelobes after passing through the matched filter is called Barker code.

The narrowband approximation of this wideband signal leads to errors. The narrowband conditions in literature are a gross indication of when the narrowband treatment of a signal is invalid. In this paper a mathematical expression is derived quantifying the error committed when applying the narrowband approximation.

Abstract: In this paper the application of the wideband radar ambiguity function and its nonparametric variant in radar and navigation systems is considered. The new nonparametric variant of the ambiguity function, which is based on the copula notion, is discussed. The suggested function can be used for the signal synthesis and detection in different electronic systems for signals with an.

Waveform Design and Generalized Ambiguity Function for Ultrawideband Nonsinusoidal Signals or impulses [1]– [3]. The concept of relative bandwidth was introduced by Harmuth [1] to distinguish between narrowband and ultrawideband radio technology.

The relative bandwidth is defined as follows: η = ∆f fc for sinusoidal signals, η = fH −fL File Size: KB. In particular, in the wide band case, WA(u) is a time–scale operator, whereas the narrow band ambiguity function, A(u), is a time–frequency operator. There is a corresponding wide band radar ambiguity problem which is at least as intractable as the narrow band Size: KB.

programming, broadband ambiguity function, wideband ambiguity function, Doppler. Introduction Constant-modulus (a.k.a. unimodular) signals encode information by periodically changing the phase of a carrier.

They are used in applications such as active sonar, radar, communications, seismology, non-destructive testing, and biomedical imaging [1.

Waveform Design for Active Sensing Systems A Computational Approach. Get access. Lin, Z. [], ‘ Wideband ambiguity function of broadband signals ’, ‘ Minimum peak range sidelobe filters for binary phase-coded waveforms ’, IEEE Transactions on Author: Hao He, Jian Li, Petre Stoica.

The narrowband ambiguity function has been used to study the space-time resolution of radar and sonar signals. Its derivation, properties, and generalizations are reviewod in a unifyinj- notation. A "most general ambiguity function" is defined, from which both narrowband and wideband am-biguity functions can be derived.

This paper presents binary phase Barker codes and corresponding decoding filters. These filters are optimal in the sense that they produce no sidelobes and they maximize the signal-to noise ratio.

Here, the input code is sampled at a rate of N s. Key Words: binary phase Barker codes, matched filter, mismatched filter (sidelobe-free decoding.

Description Narrowband and wideband ambiguity functions for selected Barker binary pahse codes EPUB

Synchronization-based scheme for calculating ambiguity functions of wideband chaotic signals Article in IEEE Transactions on Aerospace and Electronic Systems 44(1) - February with. Broadband signal analysis and design for radar and sonar systems require the use of a wideband ambiguity function (WAF) to estimate their performance.

The properties of WAF for FM signals are studied and the results of numerical computation are compared with the theoretical expressions.

The main findings presented here include the following. (a) A broadband LFM signal is not a Doppler Cited by: EMPIRICAL ANALYSIS ON DOPPLER TOLERANT RADAR CODES.

The binary codes like barker code and conventional pol-yphase pulse compression codes including frank code, p1, p2, p3 and p4 code suffer severe signal loss in performance under doppler the narrowband ambiguity function. Ambiguity in Radar and Sonar M.

Joao D.

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Rendas,˜ Member, IEEE, and Jose M. Moura,´ Fellow, IEEE Abstract— We introduce a new ambiguity function for general parameter estimation problems in curved exponential families.

We focus the presentation on passive and active radar and sonar location mechanisms. The new definition is based on the. Group synchronizing of binary digital systems () by R H Barker It is shown that the optimum rule is to select the location that maximizes the sum of the correlation and a correction term.

sync ” case where the detector output has a binary ambiguity and to the case of Gaussian data. Randomized Differential DSSS: Jamming-Resistant.

The narrowband generalized correlation function is a valid approximation of the response to the echo from a moving target of a bank of matched filters, if I is much less than Af, where Af is the difference in frequency between the centers of adjacent filters in the Size: KB.

use of the ambiguity function technique for target detection in phase coded continuous wave radars a thesis submitted to the graduate school of natural and applied File Size: 8MB.

Codes may be used as the pseudorandom codes for transmission. In this paper, for the simulation we used Barker code. 11 bit Barker code is encoded by polar NRZ, one example is shown as encoded sequence in figure Fig.

Barker code. The spreaded signal by DSSS is a result of multiplication of original signal by the Barker codeFile Size: KB. The convergence of the design method in terms of cost function, normalized projection w (k) /n, and normalized eigenvalue residual r (k) versus iterations are respectively plotted in Figs.

2–4, for different values of the parameter see that although the cost function always monotonically decreases with iteration, w and r generally increase as ζ becomes larger, since the penalty for Author: Mandar A.

Chitre, Jing Tian, Hari Vishnu. A Barker code resembles a discrete version of a continuous chirp, another low-autocorrelation signal used in other pulse compression radars. The positive and negative amplitudes of the pulses forming the Barker codes imply the use of biphase modulation or binary phase-shift keying; that is, the change of phase in the carrier wave is degrees.

A binary phase-coded sequence that results in equal side lobes after passing through the matched filter is called a Barker code. The longest Barker code is of length Pseudorandom codes are generated using shift registers with feedback and a modulo-two adder.

An n-stage shift register has a total of 2 n different possible states. Fig 1.a shows the ambiguity function of Barker sequence of Length N=13 and Fig 1.b shows the auto correlation function. The PSL of a bit Barker code at theoutput of a matched filter is dB[6,7,9,10].

Fig 1.a. shows the Ambiguity plot for Barker code N=13 Fig 1.b. shows the Auto correlation plot for Barker code N=13 Size: KB. using wideband ambiguity function. The authors also present a new type of Doppler-selective signal called cutFM for the underwater scenario, and test its performance to detect moving objects in air.

FM signals such as the linear FM (LFM) and hyperbolic FM [1] have been studied for quite some time due. Generation and Implementation of Barker and Nested Binary codes 1.

IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: ,p-ISSN:Volume 8, Issue 2 (Nov. - Dec. ), PP 33 | Page Generation and Implementation of Barker and Nested Binary codes othi1, K. Raja Rajeswari2 1.

The complex narrow-band ambiguity function uses the frequency shift approximation to the Doppler Effect. It is based on the shift theorem for the FOllrier transform and is defined as in Eqn. where s(t) is the complex envelope of the signal.

Replica Correlation by FFT The digital equivalent of this matched filter operation is known as File Size: KB. What can be used instead of a Barker sequence.

Jonathan Jedwab Abstract. A classical problem of digital sequence design, first studied in the s but still not well understood, is to determine long binary sequences for which the absolute values of the aperiodic autocorrelations are File Size: KB. From the figure, one can see that the zero Doppler cut of a Barker code's ambiguity function has an interesting property.

All its sidelobes have the same height and are exactly 1/7 of the mainlobe. In fact, a length-N Barker code can provide a peak-to-peak suppression of N, which helps distinguish closely located targets in range.

Computing the Cross Ambiguity Function ΠA Review by Christopher L. Yatrakis Multiple algorithms have been developed in order to compute the narrow-band cross-ambiguity function (CAF).

These algorithms share many similarities in their structure (decimation, filtering, etc–). Ambiguity [] [] L File Size: KB.Dr. Benjamin C. Flores. Professor at Univ of Texas at El Paso. SPIE Involvement: Author Publications (47) Proceedings Article | 23 April Chaotic systems for simultaneous communications and bistatic radar.

Details Narrowband and wideband ambiguity functions for selected Barker binary pahse codes EPUB

Chandra Pappu, Benjamin Flores. Proc. SPIE.Radar Sensor Technology XXIV.The cross-ambiguity function method is used to detect the stationary and moving targets in various target detection scenarios.

The contour plots of the cross-ambiguity function are computed as a function of delay and Doppler frequency shift. The results are compared with binary sequences of the sequence lengths N=32, N=, N= and N=