Suppression of Range Ambiguity in Spaceborne SAR With Elevation Beam Pattern Mask Design

Ryu, Ji Yoon; Yi, Dong-Woo; Kim, Seyoung; Yoon, Giwan

doi:10.1109/lgrs.2020.3048426

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…It should be noted that Equation (7) and Equation ( 8) will only produce the correct indices during the active (non-zero) portion that occurs for τ seconds, and the values during the inactive period of the pulse are multiplied by zero due to the gate function described by Equation (3). Using the block and bit at any time t, the current CT bit can be obtained according to Equation (9).…”

Section: Pulse Codementioning

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: Pulse Codementioning

confidence: 99%