Fractional Fourier Transform-Based Radio Frequency Interference Suppression for High-Frequency Surface Wave Radar

Zhou, Qing; Zheng, Hong; Wu, Xiongbin; Yue, Xianchang; Chen, Zhangyou; Wang, Qinxiong

doi:10.3390/rs12010075

Cited by 11 publications

(4 citation statements)

References 29 publications

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“…When the GPS modern plan is completed, the L1 band will contain three kinds of signals, which are C/A code, P(Y) code, and M code signal, respectively. The bandwidths of the three signals are 2.046 MHz, 20.46 MHz, and 30.69 MHz, separately, so the maximum interference bandwidth is 2.046 MHz, 20.46 MHz, and 30.69 MHz [30][31][32]. This simulation considers that the interference bandwidth is the maximum.…”

Section: Impact Of Bandwidth On Anti-jammingmentioning

confidence: 99%

Suppression of Jammer Multipath in GNSS Antenna Array Receiver

Huang

Xiao

et al. 2022

Remote Sensing

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Interference multipath is an important factor to affect the anti-jamming performance for the global navigation satellite system (GNSS) antenna array receiver. However, interference multipath must be considered in practical application. In this paper, the antenna array model for interference multipath is analyzed, and an equivalent model for interference multipath is proposed. According to the equivalent interference multipath model, the influence of interference multipath on anti-jamming performance is analyzed from the space only processing (SOP) and space-time adaptive processing (STAP). Interference multipath can cause loss of the degree of freedom (DoF) of SOP. Through analysis of the equivalent model and STAP mechanism, it further reveals how the STAP can solve the interference multipath. The simulation experiments prove that the equivalent model is effective, and the analysis conclusion is correct. This paper also points out that the interference bandwidth is wider and more taps in STAP are required, under the same experiment conditions.

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Section: Impact Of Bandwidth On Anti-jammingmentioning

confidence: 99%

Suppression of Jammer Multipath in GNSS Antenna Array Receiver

Huang

Xiao

et al. 2022

Remote Sensing

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“…where S is the scale factor introduced in Reference [37], and S = T a / f r , f r is the pulse sample frequency, that is the pulse repetition frequency.…”

Section: Time-frequency Analysismentioning

confidence: 99%

Efficient Rotational Angular Velocity Estimation of Rotor Target via Modified Short-Time Fractional Fourier Transform

Wang¹,

Zhu²,

Tang³

et al. 2021

Remote Sensing

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As a special micro-motion feature of rotor target, rotational angular velocity can provide a discriminant basis for target classification and recognition. In this paper, the authors focus on an efficient rotational angular velocity estimation method of the rotor target is based on the combination of the time–frequency analysis algorithm and Hough transform. In order to avoid the problems of low time–frequency resolution and cross-term interference in short-time Fourier transform and Wigner–Ville distribution algorithm, a modified short-time fractional Fourier transform (M-STFRFT) is proposed to obtain the time-FRFT domain (FRFD)-frequency spectrum with the highest time–FRFD–frequency resolution. In particular, an orthogonal matching pursuit (OMP)-based algorithm is proposed to reduce the computational complexity when estimating the matched transform order in the proposed M-STFRFT algorithm. Firstly, partial transform order candidates are selected randomly from the complete candidates. Then, a partial entropy vector corresponding to partial transform order candidates is calculated from the FRFT results and utilized to reconstruct the complete entropy vector via the OMP algorithm, and the matched transform order can be estimated by searching minimum entropy. Based on the estimated matched transform order, STFRFT is performed to obtain the time–FRFD–frequency spectrum. Moreover, Hough transform is employed to obtain the energy accumulation spectrum, and the micro-Doppler parameter of rotational angular velocity can be estimated by searching the peak value from the energy accumulation spectrum. Both simulated data and measured data collected by frequency modulated continuous wave radar validate the effectiveness of the proposed algorithm.

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“…However, satellite navigation signals are usually in the L-band. Ground air traffic radars, active earth exploration satellites, satellite-toground mobile communication satellites, and aviation radio navigation, among others, are also in this frequency band [13,[21][22][23]. If the same frequency is used between different systems, there will be mutual interference between the different systems.…”

Section: Introductionmentioning

confidence: 99%

Influence of sweep interference on satellite navigation time-domain anti-jamming

Qiao

et al. 2023

Front. Phys.

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The global navigation satellite system (GNSS), represented by global positioning systems (GPS), is widely used in various civil and military fields and represents an essential basis for space-time information services. However, the radar signals partially overlap with the frequency band of satellite navigation signals, seriously affecting the normal reception of weak satellite navigation signal power. To further improve anti-jamming with sweep interference in the time domain, this paper focuses on the sweep interference scenario, studies the influence of the sweep interference on time-domain-adaptive anti-jamming, and proposes a timing reset based on the adaptive filter. The proposed method can effectively deal with the influence of sweep interference on time-domain-adaptive anti-jamming and can suppress interference and protect signals at the same time. Simulation experiments verify the effectiveness of the anti-jamming method proposed in this paper. Under the typical simulation scenarios, the influence time of the frequency sweep interference on the navigation signal is less than 1 m when the timing reset period is 1 m, which is significantly reduced compared to traditional methods. The proposed anti-jamming method is of great significance for improving the survivability of satellite navigation receivers in sweep interference scenarios.

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Fractional Fourier Transform-Based Radio Frequency Interference Suppression for High-Frequency Surface Wave Radar

Cited by 11 publications

References 29 publications

Suppression of Jammer Multipath in GNSS Antenna Array Receiver

Suppression of Jammer Multipath in GNSS Antenna Array Receiver

Efficient Rotational Angular Velocity Estimation of Rotor Target via Modified Short-Time Fractional Fourier Transform

Influence of sweep interference on satellite navigation time-domain anti-jamming

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