Generalized Radar Range Equation Applied to the Whole Field Region

Abstract

Most terahertz (THz) radar systems can only work in the near-field region, because the THz source power is limited and the size of the target scattered near field is up to tens of kilometers. Such conditions will result in the conventional radar range equation being unsuitable. Therefore, the near-field radar cross section (RCS) formula is given according to the numerical simulation on different targets. By modifying the parameters in the near field, including the gain of radar antennas and the RCS of targets, the generalized radar range equation is proposed. The THz radar working efficiency in the whole range and the simulation of the near-field RCS simulation model were employed to validate its effectiveness. Through comparison with the radar range equation, it can be concluded that the calculation results of the proposed equation are smaller in the near field, and the outcomes in the far field are identical. The proposed generalized radar range equation can be applied to the whole radiation area including the near field and the far field. Furthermore, more complicated real targets are calculated according to the generalized radar range equation and it can be extended from the submillimeter wave band to a much wider band range. Finally, the near-field radar theory is established, which shows its potential application to the radar cross section estimation in the extremely high frequency and fine design of THz radar systems.

Radar near-field sensing using metasurface for biomedical applications

“…To investigate the radar performance based on the theory in the scenarios with and without the metasurface, one can use the Friis radar equation applicable to the near-field region by modifying the parameters for the near-field analysis, including the antenna gain and radar range equation 48 . For traditional monostatic radar systems with far-field radiation, the radar path gain is given as, Where P TX and P RX are the transmitted and received power, G TX and G RX are the transmitter and receiver antenna gain, respectively, k is the wave number, σ is the radar cross section and R is the radar range between the TX and RX antennas.…”

“…To investigate the radar performance based on the theory in the scenarios with and without the metasurface, one can use the Friis radar equation applicable to the near-field region by modifying the parameters for the nearfield analysis, including the antenna gain and radar range equation 48 . For traditional monostatic radar systems with far-field radiation, the radar path gain is given as, Path Gain ¼…”

Intelligent Situation Awareness Based on the Fractal Dimension and Multidimensional Reconstruction

“…For example, the electromagnetic potential is different according to the selection of the parameters just for the drilling platform, as shown in Figure 9. Therefore, in order to minimize the threats detected by the radar, the radar equation [35] is called in the algorithm library and the parameters are maximized. According to the template, the horizontal direction function of the antenna takes the value range It should be noted that the above simulation of the electromagnetic situation is only the maximum threat space to the radar.…”

“…Therefore, in order to minimize the threats detected by the radar, the radar equation [ 35 ] is called in the algorithm library and the parameters are maximized. According to the template, the horizontal direction function of the antenna takes the value range $$[0 \sim 2\pi ]$$, and the vertical direction function takes the value range $$[ - 0.5\pi \sim 0.5\pi ]$$, to achieve 5D reconstruction under the maximum threat level.…”

Absolute Calibration of a UAV-Mounted Ultra-Wideband Software-Defined Radar Using an External Target in the Near-Field

“…The application for near-field RCS computation extends beyond radar calibration, including various applications such as automotive radar and terahertz radar systems. Automotive radar often encounters targets in close proximity to the radar [18], while the terahertz radar systems operate in the near-field region [19]. Elfrgani et al computed the near-field RCS for automotive radar operating at W-band using Altair Feko software [18].…”