Step-frequency radar

Iizuka, Keigo; Freundorfer, A.P.; Wu, K.H.; Mori, Hirotaka; Ogura, Hisanao; Nguyen, V.K.

doi:10.1063/1.334286

Cited by 100 publications

(38 citation statements)

References 15 publications

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“…Completely similar to the theory of "Stepped Frequency Radars" [27,28], the range dependent phase variation can be used to improve the range resolution of this system. If we set ∆f = 1/τ p , and if the delay is τ = n × τ p + δ τ , the phase would be φ = −2πn − 2π…”

Section: Problem Formulationmentioning

confidence: 99%

“…In the presented signaling, different carrier frequencies are used in different transmitters. Applying the frequency difference of ∆f = 1/τ p to all m transmitters, the range resolution can be improved to cτ p /2m according to the idea of "Stepped Frequency Radars" [27][28][29]. In the inter-pulse modulation signaling, the codes should be designed according to the criteria of good separability and proper pulse compression property.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Target Detection in Pulse-Train Mimo Radars Applying Ica Algorithms

Hatam¹,

Sheikhi²,

Masnadi-Shirazi³

2012

PIER

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Abstract-In this paper, the problem of target detection in colocated "multi-input multi-output" (MIMO) radars is considered. A pulse-train signaling is assumed to be used in this system. As the doppler effect should be considered for the pulse-train signaling, we are confronted by a compound hypothesis testing problem, so in this paper a Generalized Likelihood Ratio (GLR) detector is derived. The high complexity of this detector makes us derive a new detector based on the theory of Independent Component Analysis (ICA). It is shown that the computational load of the ICA-based detector is much less than the GLR detector. It is also shown that the sensitivity of the ICA-based detector to the doppler effect is very low. According to this approach, an appropriate signal design method is presented, based on the separation performance of the ICA algorithms. It is shown that independent random sequences are proper signals in the sense of detection performance.

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Section: Problem Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Target Detection in Pulse-Train Mimo Radars Applying Ica Algorithms

Hatam¹,

Sheikhi²,

Masnadi-Shirazi³

2012

PIER

View full text Add to dashboard Cite

show abstract

“…The number of frequency points (N) and the bandwidth of SFCW radar decides unambiguous range and down range resolution respectively 27 . Cross range depends on the center frequency of the transmitted signal and provides the ability to distinguish two closely separated targets in the lateral direction 22 .…”

Section: Mmw Measurement Set Up and Target Arrangement 21 Mmw Experimentioning

confidence: 99%

Development of Scale and Rotation Invariant Neural Network based Technique for Detection of Dielectric Contrast Concealed Targets with Millimeter Wave System

2017

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The detection of concealed targets beneath a person's clothing from standoff distance is an important task for protection and the security of a person in a crowded place like shopping malls, airports and playground stadium, etc. The detection capability of the concealed weapon depends on a lot of factors likes, a collection of back scattered data, dielectric property and a thickness of covering cloths, the hidden object, standoff distance and the probability of false alarm owing to objectionable substances. Though active millimeter wave systems have used to detect weapons under cloths, but still more attention is required to detect the target likes a gun, knife, and matchbox. To observe such problems, active V-band (59 GHz-61 GHz) MMW radar with the help of artificial neural network (ANN) has been demonstrated for non-metallic as well as metallic concealed target detection. To validate ANN, the signature of predefined targets is matched with the signature of validated data with the help of the correlation coefficient. The proposed technique has good capability to distinguish concealed targets under various cloths.

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“…The voltage scattering coefficient sk of the target is related to the IFFT7 of the data by (Izuka et al, 1984),…”

Section: Principlesmentioning

confidence: 99%