Analysis and Detection of S-Shaped NLFM Signal Based on Instantaneous Frequency

Song, Jun; Gao, Yue; Gao, Demin

doi:10.12720/jcm.10.12.976-982

Cited by 11 publications

(7 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The synthesis methods, as well as the estimation of NLFM signal parameters, are developed and discussed. The issue is known both in radars [27,28,29] and sonars [30,31]. Unfortunately, most of these methods require certain assumptions, such as the phase being described by the P -th order polynomial.…”

Section: State Of the Artmentioning

confidence: 99%

A Block Method Using the Chirp Rate Estimation for NLFM Radar Pulse Reconstruction

Abratkiewicz

Samczyński

2019

Sensors

View full text Add to dashboard Cite

This paper presents a novel approach to fast and accurate non-linear pulse signal reconstruction dedicated for electromagnetic sensors and their applications such as ELectronic INTelligence (ELINT), electronic warfare (EW), electronic reconnaissance (ER) systems, as well as for passive bistatic radar purposes in which other pulse radars are used as a source of illumination. The method is based on the instantaneous chirp rate (CR) estimation in the time-frequency (TF) domain providing a calculation of the frequency rate between every two consecutive samples. Such a new method allows for the precise reconstruction of the non-linear frequency modulated (NLFM) signal to be carried out in significantly shorter time in comparison to methods known in the literature. The presented approach was tested and validated using both simulated and real-life radar signals proving the usability of the proposed solution in practical applications. The results were compared with the precise extended generalized chirp transform (EGCT) method as a reference technique, using optimal matched filtration as the main concept.

show abstract

Section: State Of the Artmentioning

confidence: 99%

A Block Method Using the Chirp Rate Estimation for NLFM Radar Pulse Reconstruction

Abratkiewicz

Samczyński

2019

Sensors

View full text Add to dashboard Cite

show abstract

“…The equation NLFM S of instantaneous frequency, instantaneous phases and real signal can be seen in (9). Figure 4 shows the chirp of NLFM S. The design of a chirp of NLFM S is built from the formula of tangent function [15].…”

Section: B Non Linear Frequency Modulation (Nlfm)mentioning

confidence: 99%

“…The equations of NLFM Taylor original signal can be seen in (13) until (15). Substituting is done between (14) and (17), (18) and (19) where the result of substituting is at the below equations.…”

Section: Model For Realistic Applicationsmentioning

confidence: 99%

Analysis of Non Linear Frequency Modulation (NLFM) Waveforms for Pulse Compression Radar

Widyantara

Sugihartono

Suratman

et al. 2018

indones.j.electron.telecommun.

View full text Add to dashboard Cite

Non Linear Frequency Modulation (NLFM) method can suppress the peak sidelobe level without additional windowing function. NLFM doesn’t require any weighting function because it has inbuilt one. NLFM has a variable frequency deviation function due to the relation between frequency and time of the signal which is not linear so that it is possible to suppress of peak sidelobe level. This paper studies the characteristic of various NLFM waveform, such as NLFM Tri Stage Piece Wise (TSPW), NLFM S, and NLFM Taylor. The study of Pulse Compression of NLFM waveform consists of three aspects. First, analysis of pulse compression performance. Second, analysis of background noise. Last, analysis of Doppler effects. The simulation is done using Matlab software. The lowest value Peak Sidelobe Level (PSL)of NLFM TSPW is about -20 dB while NLFM S and NLFM Taylor are about -32 dB and -39 dB. Additive White Gaussian Noise (AWGN) and Doppler Effect influenced the value of PSL for each NLFM waveform. NLFM Taylor has the best NLFM waveform when the Doppler Effect and AWGN cause the value of PSL become high. Comparison between NLFM Taylor and Linear Frequency Modulation(LFM) is done in radar surveillance applications to analyze the detectability performance where the condition of Radar Cross Section (RCS) for each target has different significant value. The three targets are commercial airplanes, helicopter and fighter. For detectability performance, NLFM Taylor can detect more clearly than LFM conventional.

show abstract

“…A moving target causes the Doppler effect, which affects the performance of pulse compression. Although several studies have attempted at examining this problem, sidelobe reduction and narrowing of main lobe width continue to be attracting interest of researchers [4][5][6][7][8][9][10][11]. The present study focuses on new chirp waveforms to preserve the accuracy and to obtain reduced side lobes.…”

Section: Introductionmentioning

confidence: 99%

Development and Analysis of New NLFM Waveform for Achieving Sidelobe Reduction and Narrowing of Main lobe Width

2021

IJETER

View full text Add to dashboard Cite

Aimed at narrowing main lobe width and reduced sidelobe values, we developed three new NLFM chirp waveforms. The ambiguity function and the impact of sampling rate and compression ratios of these waveforms are analyzed. Their performance is examined against the doppler effect and background noise. One of the three designed NLFM chirp waveforms is useful in applications requiring side lobes of -50 dB and narrow main lobe width. The new waveform could achieve reduced sidelobes and narrow main lobe width compared to LFM and other NLFM waveforms

show abstract

Analysis and Detection of S-Shaped NLFM Signal Based on Instantaneous Frequency

Cited by 11 publications

References 12 publications

A Block Method Using the Chirp Rate Estimation for NLFM Radar Pulse Reconstruction

A Block Method Using the Chirp Rate Estimation for NLFM Radar Pulse Reconstruction

Analysis of Non Linear Frequency Modulation (NLFM) Waveforms for Pulse Compression Radar

Development and Analysis of New NLFM Waveform for Achieving Sidelobe Reduction and Narrowing of Main lobe Width

Contact Info

Product

Resources

About