Flexible Transmit Beampattern Design via Waveform Diversity

通过波形分集进行灵活的发射波束方向图设计

• 批准号: 0634786
• 负责人: Jian Li
• 金额: $ 43.82万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-15 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0634786&HistoricalAwards=false
• 关键词: Flexible; Transmit; Beampattern; Design; via

Transmit beampattern design is critically important in many applications including defense and homeland security applications as well as biomedical applications. Traditional array approaches require all antennas to transmit the same waveform and the power and phase of each antenna output are adjusted to achieve a desired transmit beampattern. However, in many practical systems, the antenna output powers are constrained, and adjusting only the phase of each antenna output poses significant limitations in transmit beampattern designs.This research addresses the underlying transmit beampattern design technical issues associated with the current limitations. Specifically, the investigators exploit waveform diversity, i.e., the diversity offered by different sensors in a distributed-sensor system transmitting different but correlated or uncorrelated waveforms, to achieve flexible transmit beampattern designs. Waveform diversity offers a new paradigm for flexible beampattern design because of significantly increased degrees of freedom. The investigators focus on the following three application areas: 1) improved passenger aircraft protections by rending shoulder-launched guided missiles ineffective via effective directed energy systems, 2) enhanced breast cancer therapies by providing a sufficiently large focal spot using an ultrasound array under elemental power constraints, and 3) making the ocean quieter by introducing, as viable alternatives to existing systems, distributed sensor networks with each sensor output power limited to ensure the safety ofthe whales and other ocean creatures.Level of Effort StatementAt the recommended level of support, the PI and Co-PIs will make every attempt to meet the original scope and level of effort of the project.

在许多应用中，包括国防和国土安全申请以及生物医学应用在内的许多应用中，传输横梁设计至关重要。传统的阵列方法需要所有天线传输相同的波形，并调整每个天线输出的功率和相位以实现所需的发射光束板。但是，在许多实用系统中，天线输出功率受到限制，并且仅调整每个天线输出的相位在发送光束板设计中构成了重大限制。这项研究解决了与当前局限性相关的基本传输光束设计技术问题。具体而言，研究人员利用波形多样性，即分布式传感器系统中不同传感器提供的多样性传输不同但相关或不相关的波形，以实现灵活的传输频率。波形多样性为灵活的梁板设计提供了新的范式，因为自由度显着增加。调查人员专注于以下三个应用领域：1）通过有效的导向能源系统进行肩部发出肩部发射的导弹，通过伸出肩部发射的导弹无效，2）通过在元素功率约束下提供足够大的超声阵列来增强乳腺癌疗法，并提供足够大的焦点，以及在元素下的限制性替代机构，以确保替代型号，以确保有限的替代方案，并实现限制性的替代方案，并有限地将强度的驱动器介绍，并实现强度的替代方案，并有限地将强度的驱动器介绍，并通​​过有限的替代方案，并有限在鲸鱼和其他海洋生物中。