SAR antenna design for ambiguity and multipath suppression
نویسنده
چکیده
A high resolution airborne Synthetic Aperture Radar (SAR) has been developed at Electromagnetics Institute (EMI) for remote sensing applications. This paper considers the radiation of antennas for a SAR system from a systems perspective. The basic specifications of an idealised antenna are obtained from the required swath and tlie azimuth footprint needed for the SAR processing. The radiation from a real antenna causes unwanted signal returns that lead to intensity variations (multipath) and ghost echoes (ambiguity). Additional specifications are deduced by considering these signals. The requirements are illustrated by exaniples from a realised dual polarised antenna for a C-hand SAR.
منابع مشابه
Optimization Capabilities of LMS and SMI Algorithm for Smart Antenna Systems (RESEARCH NOTE)
In the present paper convergence characteristics of Sample matrix Inversion (SMI) and Least Mean Square (LMS) adaptive beam-forming algorithms (ABFA) are compared for a Smart Antenna System (SAS) in a multipath environment. SAS are employed at base stations for radiating narrow beams at the desired mobile users. The ABFA are incorporated in the digital signal processors for adjusting the weight...
متن کاملAn Optimal Antenna Pattern Synthesis for Active Phased Array Sar Based on Particle Swarm Optimization and Adaptive Weight- Ing Factor
This paper shows that an optimal antenna pattern for active phased array synthetic aperture radar (SAR) has been synthesized to meet the best performances based on particle swarm optimization (PSO) and adaptively selected weighting factors. Because the antenna radiation pattern has a very close relation with the performance of an active phased array SAR system, the authors derived the multi-obj...
متن کاملCentimeter Positioning with a Smartphone-Quality GNSS Antenna
This paper demonstrates for the first time that centimeteraccurate positioning is possible based on data sampled from a smartphone-quality Global Navigation Satellite System (GNSS) antenna. Centimeter-accurate smartphone positioning will enable a host of new applications such as globally-registered fiduciary-marker-free augmented reality and location-based contextual advertising, both of which ...
متن کاملGroove Gap Waveguide (GGW) H-plane Horn Antenna and a Method for Its Back lobe Suppression
recently a new structure called groove gap waveguide (GGW) is introduced to implement low loss microwave component devices especially for millimeter wave applications. This paper presents a new type of H-plane horn antenna making use of this new technology in which backward radiation is significantly suppressed by introducing a high impedance surface at the antenna aperture. The high impe...
متن کاملطراحی آنتن میکرواستریپ با شکاف U شکل و تغذیه تزویج مجاورتی جهت کاربرد در آنتن رادار روزنه مصنوعی
In this paper, the design and simulation of an antenna for SAR applications, with specified imaging characteristics, is proposed. The antenna should represent a wideband impedance bandwidth and also a high gain; so the design of a microstrip array antenna with proximity coupling feed and U-shaped slot patch is considered. First, the main design parameters of such an antenna element are recogniz...
متن کامل