An Advanced Scheme for Range Ambiguity Suppression of Spaceborne SAR Based on Blind Source Separation

Chang, Sheng; Deng, Yunkai; Zhang, Yanyan; Zhao, Qingchao; Wang, Robert; Zhang, Ke

doi:10.1109/tgrs.2022.3184709

Cited by 25 publications

(30 citation statements)

References 44 publications

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“…In a continuous transmission mode, the encryption needs to be done at the rate of the BPSK chipping frequency (modulation rate) divided by 128. The complete AES-192 encryption algorithm is described in [10], and its inputs and output are abstracted by Equation (1).…”

Section: Aes-192 Pseudo-random Generatormentioning

confidence: 99%

“…The inherent Range and Doppler ambiguities in radar signal processing are significant issues that cause uncertainties in the location and relative velocity of targets. There are various methods available for mitigating these ambiguities, including using multiple subantennas [1], MIMO with pulse coding [2], beam pattern masking [3], dual phase term tracking [4], the use of multiple hypothesis tracking models and data association [5], mitigating range ambiguity using Doppler Division Multiple Access (DDMA) [6] and the use of phase codes to modulate the baseband signal [7].…”

Section: Introductionmentioning

confidence: 99%

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Reduction of Doppler and Range Ambiguity Using AES-192 Encryption-Based Pulse Coding

Kamrath

Baginski

Martin

2023

Sensors

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This research investigates the use of a Binary Phase Shift Key (BPSK) sequence derived from the 192-bit key Advanced Encryption Standard (AES-192) algorithm for radar signal modulation to mitigate Doppler and range ambiguities. The AES-192 BPSK sequence has a non-periodic nature resulting in a single large and narrow main lobe in the matched filter response but also produces undesired periodic side lobes that can be mitigated through the use of a CLEAN algorithm. The performance of the AES-192 BPSK sequence is compared to an Ipatov–Barker Hybrid BPSK code, which effectively extends the maximum unambiguous range but has some limitations in terms of signal processing requirements. The AES-192 based BPSK sequence has the advantage of having no maximum unambiguous range limit, and when the pulse location within the Pulse Repetition Interval (PRI) is randomized, the upper limit on the maximum unambiguous Doppler frequency shift is greatly extended.

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Section: Aes-192 Pseudo-random Generatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reduction of Doppler and Range Ambiguity Using AES-192 Encryption-Based Pulse Coding

Kamrath

Baginski

Martin

2023

Sensors

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show abstract

“…Compared with the robust principal component analysis, the proposed method has a better performance. Chang et al [39] proposed an advanced scheme for range ambiguity suppression of spaceborne SAR based on BSS. In the proposed scheme, the echoes are transmitted within the adjacent pulse repetition intervals to simulate multiple beams, and the scattered echoes are received by the sixteen-channel antennas in the range dimension simultaneously.…”

Section: Introductionmentioning

confidence: 99%

An Advanced Echo Separation Scheme for Space-Time Waveform-Encoding SAR Based on Digital Beamforming and Blind Source Separation

et al. 2022

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To achieve high-resolution and wide-swath (HRWS) imaging, a space-time waveform-encoding (STWE) spaceborne synthetic aperture radar (SAR) system is adopted. In rugged terrain, the beam-pointing mismatch problem will appear when the traditional digital beamforming (DBF) technique is used to separate the received echoes. This problem leads to decreasing the received echo’s gain, deteriorating the quality of the image product and making the interpretation of SAR image difficult. To address this problem, an advanced echo separation scheme for STWE spaceborne SAR based on the DBF and blind source separation (BSS) is put forward in this paper. In the scheme, the echoes are transmitted within the adjacent pulse repetition intervals to simulate multiple beams, and the scattered echoes are received by the sixteen-channel antennas in elevation simultaneously. In post-processing, a detailed flow is adopted. In the method, the DBF is firstly performed on received echoes. Due to the error caused by terrain undulation, the degree of echo separation is not enough. Then, the BSS is performed on the multiple echoes obtained after the DBF processing. Finally, the highly separated echo signal can be obtained. In this scheme, there is no need to perform the direction of arrival (DOA) estimation before the DBF processing, which saves valuable computing resources. In addition, to verify the proposed scheme, point target and distributed target simulations based on the 16-channel data of an elevation X-band DBF-SAR system are carried out. The results of point targets indicate that the residual echo caused by rough terrain can be reduced by more than 14 dB using the proposed scheme. The proposed scheme can be directly implemented into existing SAR systems; thus, it does not increase the complexity of the system design. The scheme has the potential to be applied to future spaceborne SAR missions.

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“…At present, methods to suppress mainlobe jammers have been explored by exploiting the discrepancies between the false targets and the true target in various domains, such as the time domain [10], frequency domain [11][12][13], spatial domain [14], and polarization domain [15]. Particularly, pulse frequency agility was utilized in [16] by adopting distinct frequencies among the transmit pulses.…”

Section: Introductionmentioning

confidence: 99%

Mainlobe Deceptive Jammer Suppression Based on Quadratic Phase Coding in FDA-MIMO Radar

Zhang¹,

Liao²,

Xu³

et al. 2022

Remote Sensing

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In this paper, the problem of mainlobe deceptive jammer suppression is solved with the frequency diversity array-multiple-input multiple-output (FDA-MIMO) radar system. At the modeling stage, based on the FDA-MIMO radar, a quadratic phase code (QPC) is applied along the slow time dimension in the transmit array. In the receiver, after decoding and principal range compensation, the true and false targets that are generated in an identical angle, can be discriminated in the joint transmit-receive-Doppler frequency domain. Particularly, the false targets are equivalently moved from the mainlobe to the sidelobes in the transmit spatial frequency domain. Then, by performing the data-dependent transmit-receive-Doppler three-dimensional beamforming, the false targets are suppressed owing to Doppler and range mismatches. Moreover, by moving the jammers to nulls in the Doppler frequency domain, the capability in terms of the maximum number of suppressible jammers can be strengthened with an appropriate coding coefficient and frequency increment. Numerical results can certify the suppression capability of the QPC-FDA-MIMO radar.

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An Advanced Scheme for Range Ambiguity Suppression of Spaceborne SAR Based on Blind Source Separation

Cited by 25 publications

References 44 publications

Reduction of Doppler and Range Ambiguity Using AES-192 Encryption-Based Pulse Coding

Reduction of Doppler and Range Ambiguity Using AES-192 Encryption-Based Pulse Coding

An Advanced Echo Separation Scheme for Space-Time Waveform-Encoding SAR Based on Digital Beamforming and Blind Source Separation

Mainlobe Deceptive Jammer Suppression Based on Quadratic Phase Coding in FDA-MIMO Radar

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