Linear frequency modulation waveform synthesis

Patel, Kiran; Neelakantan, Usha; Gangele, Shalini; Vacchani, J. G; Desai, Nilesh M.

doi:10.1109/sceecs.2012.6184744

Cited by 13 publications

(5 citation statements)

References 3 publications

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“…It is often encountered in applications such as radar, sonar, and seismic signals [7][8] . In LFM, the frequency of the modulating signal increases linearly over the pulse duration of the signal, making LFM the most popular radar waveform due to its good range resolution and Doppler sensitivity [9] . LFM is a spread spectrum modulation technique that does not require pseudorandom coding sequences.…”

Section: Lfm-based Radar Communication Integrationtechnology Automati...mentioning

confidence: 99%

Challenge and Prospect of High-speed Rail Radar Communication Integration Technologies

Pan,

Zhang,

Tong

et al. 2024

E3S Web of Conf.

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Radar plays an important role in urban public transit system, so it is of great significance to ensure the safe operation of High-speed rail. Radar communication integration technology has the characteristics of high efficiency and low energy consumption, it can improve communication quality, speed up transmission efficiency and improve detection accuracy. Firstly, this paper introduces the running scene of High-speed rail, and puts forward that radar communication integration technology has a broad application space in High-speed rail. Then it introduces radar communication integration technology, and the research status, advantages and development prospects of radar communication integration technology based on linear frequency modulation（LFM）. Finally, it is proposed that obstacle detection technology is one of the difficulties to ensure the safe operation of High-speed rail. Radar integration technology can be effectively applied to train obstacle detection, which is an important technical support for improving service quality and speeding up the intelligent construction of High-speed rail in the future.

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Section: Lfm-based Radar Communication Integrationtechnology Automati...mentioning

confidence: 99%

Challenge and Prospect of High-speed Rail Radar Communication Integration Technologies

Pan,

Zhang,

Tong

et al. 2024

E3S Web of Conf.

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“…An investigation of clutter sequences shows that random large spikes of clutter remainder take place but good clutter elimination is obtained in most of the clutter cells, when the active range of the radar is exceeded. Authors in [15][16][17][18], gives an insight about the purpose of the spikes of clutter residue and presents the statistics of the residue for two, three & four pulse MTI lters. The percentage of clutter limited cells with good MTI performance supports that most of the clutter-limited cells do exhibit good MTI performance.…”

Section: Literature Reviewmentioning

confidence: 99%

Digital Pulse Compression: Linear Frequency Modulation Approach

Gowda

Siddesh

Anu³

et al. 2023

Preprint

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In radar system a challenging task is to achieve a good range resolution with a shorter pulse which needs more peak power. High peak power makes the design of transceivers complex because the devices used to build transceivers are able to withstand with high peak power. In literature pulse compression method is widely used to minimize the problem of using high peak power signal. In this paper, the problem of generating a high peak power signal with shorter duration, which is used to detect only moving targets has been addressed by proposing a novel radar pulse compression method using Linear Frequency Modulation with improved range resolution with a basic construction of a pulse processor which is analogous to a standard matched filter, and is reformed to suit an application. Multiple code types and lengths needed are used due to the flexibility in the design which reduce an uncertainties affected by the use of high pulse repetition frequencies.

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“…The underwater acoustic pulses transmitted by the active SONAR transmission system are generated by an oscillator and waveform controller and returned as echoes to the transducer or hydrophone. The most commonly used pulses in active SONAR are continuous wave (CW) and frequency modulation (FM) as mentioned in [2,4,33,34].…”

Section: Pulse Typesmentioning

confidence: 99%

Cavitation Detection in a Tonpilz-Type Transducer for Active SONAR Transmission System

Villalobos

López

Vázquez

et al. 2023

JMSE

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The active sound navigation and ranging (SONAR) transmission system emits acoustic pulses underwater using a wave generator, a SONAR power amplifier (SPA), and a projector. The acoustic pulse travel in the direction of the target and return as an echo to a hydrophone to learn the range or speed of the object. Often the same device is used as a hydrophone and a projector; in this context, it is known as a transducer. In order to obtain a maximum range of detection in the SONAR, it is desirable to generate the maximum amount of acoustic power until the point in which the echo can be detectable in an atmosphere with non-wished noise. Therefore, a high value of source level (SL) is required that depends largely on the value of electrical power applied to the transducer (Pe). However, when trying to obtain the maximum range of detection in the SONAR system there are the following three peculiar limitations that affect performance: The cavitation, the reverberation, and the effect of interaction in the near field. In this paper, an experimental measurement methodology is presented to detect the cavitation effects in a tonpilz-type transducer for an active SONAR transmission system using a transducer as a projector and a calibrated hydrophone in a hydroacoustic tank by measuring the parameters of total harmonic distortion of the fundamental waveform (THD-F) of the generated acoustic pulse, transmitting voltage response (TVR) to characterize the system and sound pressure level (SPL) that indicates the intensity of sound at a given distance. Whereas the reverberation and the interaction effect in the near field are objects of other study cases. A 570.21 W and THD-F < 5% switched-mode power amplifier (SMPA) prototype was developed to excite the electroacoustic transducer employing a full-bridge inverter (FBI) topology and a digital controller using a field-programmable gate array (FPGA) for unipolar sine pulse width modulation (SPWM) to generate a continuous wave (CW) acoustic pulse at a frequency 11.6 kHz. The results obtained show that from the level of Pe=196.05 W with the transducer at 1 m of depth, the value of THD-F increases significantly while the behavior of the TVR and SPL parameters is affected since it is not as expected and is attributed when cavitation occurs.

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Linear frequency modulation waveform synthesis

Cited by 13 publications

References 3 publications

Challenge and Prospect of High-speed Rail Radar Communication Integration Technologies

Challenge and Prospect of High-speed Rail Radar Communication Integration Technologies

Digital Pulse Compression: Linear Frequency Modulation Approach

Cavitation Detection in a Tonpilz-Type Transducer for Active SONAR Transmission System

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