Non-crosstalk real-time ultrasonic range system with optimized chaotic pulse position-width modulation excitation

Yao, Zhenjing; Meng, Qinghao; Gen-wang, LI; Lin, Peng

doi:10.1109/ultsym.2008.0174

Cited by 22 publications

(12 citation statements)

References 11 publications

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“…The novel spectrum spread technique did not receive the proper attention in ultrasound: trains of the arbitrary position and width pulses (APWP) [18], [19]. Technique is using a chaotically placed train of square pulses with arbitrary position and width (Fig.…”

Section: Apwp Signalsmentioning

confidence: 99%

Application of Arbitrary Position and Width Pulse Trains Signals in Ultrasonic Imaging: Correlation Performance Study

Svilainis¹,

Lukoševičiūtė²,

Dumbrava³

et al. 2013

ElAEE

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Ultrasonic imaging requires both the accuracy and the resolution. Conventional imaging systems use the pulse signals to accomplish the task. But the energy attainable with such signals is limited. Spread spectrum, compressible signals allow to achieve the wide bandwidth even using long durations. Conventional signals do not offer full flexibility or, like nonlinear frequency modulation signals, lack the ease of properties control. We suggest using novel spread spectrum signals generation technique: trains of pulses of arbitrary pulse width and position (APWP). It is expected that APWP should have properties similar to chirp (wide, controllable bandwidth) and both the single pulse (low correlation sidelobes) signals. Study presented here was aimed at evaluating the correlation properties of APWP signals. It indicates that application of APWP signals allows obtaining the properties better or close to those of the conventional signals. It can be concluded that APWP signals offer a new perspective in imaging applications.

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Section: Apwp Signalsmentioning

confidence: 99%

Application of Arbitrary Position and Width Pulse Trains Signals in Ultrasonic Imaging: Correlation Performance Study

Svilainis¹,

Lukoševičiūtė²,

Dumbrava³

et al. 2013

ElAEE

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“…Chaotic sequences are used to modulate the position and sign of UWB ultrashort pulses (USP) [ 22 , 23 , 24 , 25 , 26 ] in the framework of position modulation, where symbols are encoded by USP sequences with chaotic intervals between them. Position modulation with chaotic signals is used in underwater communications [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Modulation, Shaping and Replicability of UWB Chaotic Radiopulses for Wireless Sensor Applications

Kuzmin

Ефремова

Itskov

2023

Sensors

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A modulation method is proposed for generating identical UWB chaotic radio pulses using an analog generator of chaotic oscillations. The problem is on the edge of two contradicting requirements: (1) theoretical ability to produce a huge number of various-shape signals, because of high sensitivity to the initial conditions of the generator; (2) the necessity to reproduce oscillations of the same shape both in the receiver and in the transmitter for the implementation of coherent methods of signal processing. The considered method allows us to resolve this contradiction. A single-transistor chaotic oscillator with single power supply and frequency range 100 to 500 MHz is proposed. A mathematical model of the generator (a system of ODEs) was derived. A method of generating chaotic radio pulses with a reproducible shape that could be varied in a manner that is controlled and natural for UWB radio by means of changing the supply voltage of the chaotic oscillator is shown. The mathematical model of the generator is simulated numerically and proves the proposed ideas. The shaping and the replicability of UWB pulses was experimentally proven in an analog domain on a testbed with four instances of the chaotic generator.

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“…Golay codes (Hernández Á., Ureña J, & Hernanz D., 2003;Ding Z., & Payne P, 1990;Hernández Á., Ureña J., & García J, 2004; Alvarez F., Diaz V., Ureña J., & Mazo M., 1999;Marziani C., Ureña J., & Hernández A., 2007) were applied in ultrasonic ranging system to avoid crosstalk and increase the signal to noise ratio (SNR). Chaotic codes (Fortuna L., Frasca M., & Rizzo A, 2003;Yao Z., Meng M., Li G., & Lin P, 2008) were also used to eliminate crosstalk in multichannel simultaneously triggered ultrasonic ranging System. Fortuna et al (2003) exploited chaotic pulse position modulation (CPPM) to fire the ultrasonic sensor.…”

Section: Introductionmentioning

confidence: 99%

Sensors Network for Ultrasonic Ranging System

Gao

Yao

2013

International Journal of Advanced Pervasive and Ubiquitous Computing

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The spectrum matching and correlation characteristic are both important in the multiple-user ultrasonic ranging system. As people know, an ultrasonic ranging system, which has a bell-shaped magnitude spectrum, acts like a band-pass filter. If the spectrum of the excitation signal does not match that of the ultrasonic ranging system, some of energy cannot be transmitted by the ultrasonic system. In other words, it does not make full use of the bandwidth of the ultrasonic ranging system. The good correlation characteristics can eliminate cross-talk among multichannel ultrasonic sensors firing simultaneously. To the authors’ knowledge, not many researchers considered how to make the spectrum of the excitation sequence match to that of the ultrasonic ranging system as well as improve the correlation characteristics. In this paper, the chaotic frequency modulation (CFM) excitation sequences are proposed for multiple-user ultrasonic ranging system. To obtain the excitation sequences which are spectrally matched to the ultrasonic ranging system as well as have the best correlation characteristic, the NSGA-II is applied to optimize the CFM excitation sequences.

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Non-crosstalk real-time ultrasonic range system with optimized chaotic pulse position-width modulation excitation

Cited by 22 publications

References 11 publications

Application of Arbitrary Position and Width Pulse Trains Signals in Ultrasonic Imaging: Correlation Performance Study

Application of Arbitrary Position and Width Pulse Trains Signals in Ultrasonic Imaging: Correlation Performance Study

Modulation, Shaping and Replicability of UWB Chaotic Radiopulses for Wireless Sensor Applications

Sensors Network for Ultrasonic Ranging System

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