• Title, Summary, Keyword: CA-CFAR

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A Study of Efficient CFAR Algorithm (효율적인 CFAR 알고리듬 연구)

  • Shin, Sang-Jin
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.8
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    • pp.849-856
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    • 2014
  • This paper proposes a new efficient CFAR algorithm. The structure of the proposed CFAR is relatively simple as compared with the OS-CFAR or ML-CFAR which are considered to deal with the nonhomogeneous environment such as clutter and multiple targets. The proposed algorithm is effectively applied to the radar signal processor with reduced computation burden. The relationship between the threshold and PFA of the proposed CFAR is derived analytically. The CFAR loss of the proposed CFAR algorithm is compared with CA-CFAR and OS-CFAR based on both SNR and ADT(Average Detection Threshold).

Fast CA-CFAR Processor Design with Low Hardware Complexity (하드웨어 복잡도를 줄인 고속 CA-CFAR 프로세서 설계)

  • Hyun, Eu-Gin;Oh, Woo-Jin;Lee, Jong-Hun
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.48 no.5
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    • pp.123-128
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    • 2011
  • In this paper, we design the CA-CFAR processor using a root-square approximation approach and a fixed-point operation to improve hardware complexity and reduce computational effort. We also propose CA-CFAR processor with multi-window, which is capable of concurrent parallel processing. The proposed architecture is synthesized and implemented into the FPGA and the performance is compared with the conventional processor designed by root-square libarary licensed by FPGA corporation.

OSR CFAR Robust to Multiple Underwater Target Environments (다중 수중 표적 환경에 강인한 OSR CFAR 알고리듬)

  • Hong, Seong-Won;Han, Dong-Seog
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.48 no.4
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    • pp.47-52
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    • 2011
  • Constant false alarm rate (CFAR) is an automatic detection algorithm for active sonar system. Among several CFAR algorithms, ordered statistics (OS) CFAR has the best performance over cell averaging (CA), smallest of (SO), greatest of (GO) algorithms at non-homogeneous environments. However, OS CFAR has the disadvantage of bad detection performance in multiple target conditions. We suggest an ordered statistics ratio (OSR) CFAR algorithm that is robust to multiple target environments. The proposed and conventional schemes are compared with computer simulations.

Analysis of the Generalized Order Statistics Constant False Alarm Rate Detector

  • Kim, Chang-Joo;Lee, Hwang-Soo
    • ETRI Journal
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    • v.16 no.1
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    • pp.17-34
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    • 1994
  • In this paper, we present an architecture of the constant false alarm rate (CFAR) detector called the generalized order statistics (GOS) CFAR detector, which covers various order statistics (OS) and cell-averaging (CA) CFAR detectors as special cases. For the proposed GOS CFAR detector, we obtain unified formulas for the false alarm and detection probabilities. By properly choosing coefficients of the GOS CFAR detector, one can utilize any combination of ordered samples to estimate the background noise level. Thus, if we use a reference window of size N, we can realize $(2^N-1)$ kinds of CFAR processors and obtain their performances from the unified formulas. Some examples are the CA, the OS, the censored mean level, and the trimmed mean CFAR detectors. As an application of the GOS CFAR detector to multiple target detection, we propose an algorithm called the adaptive mean level detector, which censors adaptively the interfering target returns in a reference window.

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Code Acquisition with Receive Diversity and Constant False Alarm Rate Schemes: 1. Homogeneous Fading Circumstance (수신기 다양성과 일정 오경보 확률 방법을 쓴 부호획득: 1. 균질 감쇄 환경)

  • Kwon Hyoung-Moon;Oh Jong-Ho;Song Iick-Ho;Lee Ju-Mi
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.4C
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    • pp.371-380
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    • 2006
  • The performance characteristics of the cell averaging(CA), greatest of(GO), and smallest of(SO) constant false alarm rate(CFAR) processors in homogeneous environment are obtained and compared when receiving antenna diversity is employed in the pseudonoise code acquisition of direct-sequence code division multiple access (DS/CDMA) systems. From the simulation results, it is observed that the CA CFAR scheme has the best performance and the GO CFAR scheme has almost the same performance as the CA CFAR scheme in homogeneous environment. In Part 2 of this paper, the CA, GO, and SO CFAR processors for code acquisition in nonhomogeneous environment are addressed.

Advanced OS-CFAR Processor Design with Low Computational Effort (순서통계에 근거한 개선된 CFAR 검파기의 하드웨어 구조 제안)

  • Hyun, Eu-Gin;Lee, Jong-Hun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.1
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    • pp.65-71
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    • 2012
  • An OS-CFAR (Ordered Statistics CFAR) based on a sorting algorithm is useful for automotive radar systems in a multi-target situation. However, while the typical cell-averaging CFAR has low computational complexity, the OS-CFAR has much higher computation effort. In this paper, we design the new OS-CFAR architecture with a low computational effort. In the proposed method, since one time sorting processing is performed for the decision of the CFAR threshold, the whole processing effort can be reduced. When the fast sorting technique is employed, the computing time of the proposed OS-CFAR is always much shorter compared with typical OS-CFAR method regardless of the data size. We also present the processing result of proposed architecture using the real radar data.

An Improvement in Detection Performance of Logarithmic Receiver (대수수신계통의 탐색특성개선)

  • 윤현보;장태무;조광래
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.9 no.1
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    • pp.45-48
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    • 1984
  • A serious degradation of blocking of the detection performance in a cell aeraging-logarithmic detector/constant false alarm rate(CA-LOG/CFAR) is known to be caused by the presence of a large interfering noise in the set of sample mean. A technique consisting of the logarithmic circuit and inverter has been proposed to alleviate this problem, by modifying the conventional CA-LOG/CFAR receiver. The detection performance of the proposed technique is linearly improbed over the normal output level and the blocking characteristics of the CA-LOG/CFAR can be changed to finite output level.

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Code Acquisition with Receive Diversity and Constant False Alarm Rate Schemes: 2. Nonhomogeneous Fading Circumstance (수신기 다양성과 일정 오경보 확률 방법을 쓴 부호획득: 2. 벼균질 감쇄 환경)

  • Kwon Hyoung-Moon;Kang Hyun-Gu;Park Ju-Ho;Ahn Tae-Hoon;Lee Sung-Ro;Song Iick-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.7C
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    • pp.725-734
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    • 2006
  • As a sequel to Part 1, the performance characteristics of the cell averaging (CA), greatest of (GO), and smallest of (SO) constant false alarm rate (CFAR) processors in nonhomogeneous environment are obtained and compared when receiving antenna diversity is employed in the pseudonoise (PN) code acquisition of direct-sequence code division multiple access (DS/CDMA) systems. Unlike in homogeneous environment, the GO CFAR processor is observed to exhibit the best performance in nonhomogeneous environment, with the CA CFAR processor performing the second best.

The Study of CFAR(Constant False Alarm Rate) process for a helicopter mounted millimeter wave radar system

  • Kim In Kyu;Moon Sang Man;Kim Hyoun Kyoung;Lee Sang Jong;Kim Tae Sik;Lee Hae Chang
    • Proceedings of the IEEK Conference
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    • pp.890-895
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    • 2004
  • This paper describes constant alarm rates process of millimeter wave radar that exits on non-stationary target detection schemes in the ground clutter conditions. The comparison of various CFAR processes such as CA(Cell-Average)-CFAR, GO(Greatest Of)/SO(Smallest Of)-CFAR and OS(Order Statistics)-CFAR performance are applied. Using matlab software, we show the performance and loss between detection probability and signal to noise ratio. When rang bins increase, this results show the OS-CFAR process performance is better than any others and satisfies the optimal detection probability without loss of detection in the homogeneous clutter.

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Target Detection probability simulation in the homogeneous ground clutter environment

  • Kim, In-Kyu;Moon, Sang-Man;Kim, Hyoun-Kyoung;Lee, Sang-Jong;Kim, Tae-Sik;Lee, Hae-Chang
    • International Journal of Aeronautical and Space Sciences
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    • v.6 no.1
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    • pp.8-16
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    • 2005
  • This paper describes target detection performance of millimeter wave radar that exits on non-stationary target detection schemes in the ground clutter conditions. The comparison of various CFAR process schemes such as CA(Cell-Average)-CFAR, GO(Greatest Of)/SO(Smallest Of)-CFAR, and OS(Order Statistics)-CFAR performance are applied. Using matlab software, we show the performance and loss between target detection probability and signal to noise ratio. This paper concludes the OS-CFAR process performance is better than any others and satisfies the optimal detection probability without loss of detection in the homogeneous clutter, When range bins increase.