Method of Passive MMW Image Detection and Identification for Close Target

Abstract

This paper mainly deals with the problem of detecting and identifying target in close range, the performance of which will be effected by the radiometer's parameters and target's characteristics. According to the relationship between the range equation of the Passive Millimeter Wave (PMMW) and these parameters, we present a convenient statistical method based on PMMW image detection to solve the inherent problem by statistical radiometer parameters, which can be achieved by the W band radiometer experimental data. Finally, we validate the method by simulation and experiment. The results show that the method is convenient for detecting and identifying target in close range.

Shape Feature Analysis of Concealed Objects With Passive Millimeter Wave Imaging

“…There have been researches on the automatic detection of concealed objects [7][8][9][10][11][12][13][14]. The multi-level thresholding was addressed to detect the contours of the concealed objects from Terahertz images [7].…”

“…Multi-level segmentation has been proposed to cluster pixels adopting the expectation and maximization (EM) algorithm [9,10]. Object identification has been performed using the radiation characteristics of a target in a close range [11]. Studies on concealed weapon identification and navigation were presented in [12].…”

Mm‐wave imaging results based on a frequency scanning delay line waveguide horn antenna array

“…Additionally, mm‐wave imaging systems need the use of complex focusing structures; that is, metallic mirrors with moveable parts to scan in 2D the overall image under analysis .…”

“…If a power source is used to illuminate the targets, then the system is known as active . If no power source is used to illuminate the targets, then the system is passive . However, the main advantage when using passive systems is that the scene is not radiated, so bounces of more exposed areas do not hide other areas so a more realistic image is obtained.…”

Millimeter-wave emission characteristics of bilayer radar-infrared compound stealth material

“…PMMW imaging systems can generate images through the passive detection of naturally emitting MMW radiation from substances. In recent years, researchers have used PMMW technology for military applications, including detecting aircrafts [6][7][8][9] , especially stealth fighters due to the "hot" MMW emission of radar-absorbing materials (RAMs). Traditional stealth fighters generally have RAM on the surface [10] .…”