SBIR Phase II: Wireless Weigh-in-Motion

这个小型企业创新研究（SBIR）第二阶段项目将开发一个基于加速度计的无线运动称重（WIM）站的全功能原型。WIM系统将包括一系列电池供电的3？立方体，嵌入在人行道上，每个都由一个加速度计、一个用于本地信号处理的微处理器和一个将处理后的测量数据发送到路边接入点（AP）的无线电组成。美联社估算了一辆卡车在高速公路上每根车轴的路面负荷，而卡车？S类，并将这些估计值传输到交通管理中心。这些立方体占用最小的空间，并在几分钟内安装完成，因此WIM系统可以部署在任何地方，成本只是传统WIM站的一小部分。第一阶段的研究展示了WIM的技术可行性和商业潜力。第二阶段的技术目标涉及WIM的包装和安装；校准：对重量、速度和温度的敏感性（特别是沥青路面）；信号压缩与源编码；信道编码;广域数据回程；系统总体设计；制造原型样品；以及广泛的测试。该项目的更广泛的影响/商业潜力是，通过大幅降低WIM站的成本，大大加强对卡车重量的监管，并为大大改善美国道路和桥梁基础设施的维护提供数据。目前WIM站点的部署有限，因为它们的安装成本很高，需要关闭道路数天，并且需要昂贵的维护和重新校准。新的WIM站点可以广泛部署在主干道和港口附近的其他地点，以监测卡车交通，并成为基于卡车重量的执法和收费系统的组成部分。这些WIM站也可以在海外市场实现类似的目标，为拥有设计、制造、销售和安装等不同技能的美国居民创造就业机会。

This Small Business Innovation Research (SBIR) Phase II project will develop a fully functional prototype of an accelerometer-based wireless Weigh In Motion (WIM) station. The WIM system will comprise an array of battery-powered 3? cubes, embedded in the pavement, each consisting of an accelerometer, a microprocessor for local signal processing, and a radio that sends the processed measurements to an Access Point (AP) on the side of the road. The AP estimates the pavement load from each axle of a truck at freeway speeds and the truck?s class, and transmits these estimates to the traffic management center. The cubes take up minimal space and are installed within minutes, so WIM systems can be deployed anywhere at a fraction of the cost of traditional WIM stations. Phase I research demonstrated the technical feasibility and commercial potential of the WIM. The technical objectives of Phase II concern the WIM packaging and installation; calibration: sensitivity to weight, speed and temperature (especially for asphalt pavements); signal compression and source coding; channel coding; wide area data backhaul; overall system design; manufacturing prototype samples; and extensive testing. The broader impact/commercial potential of this project is to dramatically enhance the regulation of truck weights and provide data to greatly improve the maintenance of the US road and bridge infrastructure by drastically reducing the costs of WIM stations. Current WIM stations have limited deployment as they are costly to install requiring shutting the road for days and needing expensive maintenance and re-calibration. The new WIM stations could be widely deployed in additional locations on arterial streets and near ports to monitor truck traffic and be a component in a truck weight-based enforcement and toll system. These WIM stations could also meet similar objectives in overseas markets creating employment for US residents with diverse skills in the design, manufacturing, sales, and installation.