Compact high-frequency surface wave radar (HFSWR) plays a critical role in ship surveillance. Due to the wide antenna beam-width and low spatial gain, traditional constant false alarm rate (CFAR) detectors often induce detection probability. To solve this problem, joint algorithm based on time-frequency (TF) analysis CFAR method is proposed paper. After TF ridge extraction, performed test each ...

A new method designated as the mean-to-mean ratio (MMR) test is proposed for the detection of nonhomogeneities in a radar’s Constant False Alarm Rate (CFAR) reference window. No a priori knowledge of the nonhomogeneity topology is assumed. Analysis using the Monte-Carlo method based on Rayleigh clutter and Swerling I target models is presented. Target-like interferences which seriously degrade ...

Recent publications have explored coherent radar detection in a compound Gaussian clutter environment with inverse gamma texture, since the latter clutter model has been validated for X-band high-resolution maritime surveillance radar clutter returns. This paper explores the development of coherent constant false alarm rate (CFAR) detectors for this scenario. In the first instance, a detector i...

In this article, we propose a determinant ratio test (DRT) statistic to measure the similarity of two covariance matrices for unsupervised change detection in polarimetric radar images. The multilook complex matrix is assumed follow scaled Wishart distribution. doing so, provide distribution DRT that exactly Wilks’s lambda second kind distribution, with density expressed terms Meijer G-function...

This letter proposes a novel technique for detecting a target signal buried in clutter using principal component analysis (PCA) for pulse-Doppler radar systems. The conventional detection algorithm is based on the fast Fourier transform-constant false alarm rate (FFT-CFAR) approaches. However, the detection task becomes extremely difficult when the Doppler spectrum of the target is completely b...

Recently, a novel approach for PN code acquisition of direct sequence code division multipleaccess (DS-CDMA) systems in Rayleigh fading multipath channel was proposed in [1]. The authors considered a combination of adaptive thresholding constant false alarm rate (CFAR) and smart antennas to increase the system capacity and consequently enhance the detection performance. This paper considers sti...

در مقاله پس از معرّفی مختصر همایندها و اشاره به اهمیت این نوع ترکیب‌های ثابت آموزش زبان‌های خارجی، پیشینۀ بررسی آنها روسی فارسی پرداخته می‌شود. سپس دسته‌بندی‌های مطرح شده دسته‌بندی که آن برپایۀ واژۀ اصلی دیدگاه نحوی دو گروه الف) همایندهای فعلی ب) نامی (وصفی اضافی) تقسیم می‌شوند، مناسب برای خارجی دانسته است. پرسش پژوهش است میزان همگونی فارسیِ هم‌معنا تا چه اندازه بوده ضرورت گنجاندن مبحث زبان دانشج...

The development of Intelligent Transportation Systems (ITS) puts forward higher requirements for millimeter-wave radar surveillance in the traffic environment, such as lower time delay, sensitivity, and better multi-target detection capability. Constant False Alarm Rate (CFAR) detector plays a vital role adaptive target radar. Still, traditional CFAR algorithms use sliding window to find limit ...