廉价且低空飞行的微型无人机带来了巨大的威胁，因为现有的防空传感器大多针对大型目标设计，常把它们误当杂波过滤掉。像Echodyne这样的公司正在开发紧凑的便携式雷达，其成本比传统系统低一个数量级，并能追踪远至五公里的无人机。

其他如Prandtl Dynamics等初创公司正在使用创新的声学技术来检测静默或隐藏的无人机。他们的便携式Dome-C设备和Dome-O系统能使无人机产生振动并发出超声波，增强其声学特征，从而定位隐藏在背包或车辆内的无人机。

在测试中，Prandtl的16麦克风阵列成功追踪了远至200米外、重量仅为250克的无人机，在与Dome-O配合使用时可将追踪距离延长75米。这项极具前景的技术在反无人机竞赛中获得了第二名及375,000加元（约合270,000美元）的奖金，展示了声学和低成本雷达防御系统日益增强的可行性。

Cheap and low-flying small drones pose a significant threat because existing air-defence sensors, designed for larger threats, filter them out as clutter. Companies like Echodyne are developing compact, laptop-sized radars that are an order of magnitude cheaper than traditional systems and can track drones up to five kilometres away.

Other startups, such as Prandtl Dynamics, are using innovative acoustic technology to detect silent or hidden drones. Their portable Dome-C device and Dome-O system make drones vibrate and emit ultrasound, augmenting their acoustic signature to locate them even when concealed inside backpacks or vehicles.

In trials, Prandtl's 16-microphone array successfully tracked drones as light as 250 grams up to 200 meters away, extending the range by 75 meters when paired with Dome-O. This promising tech won a second-place prize of C$375,000 ($270,000) at a counter-drone competition, demonstrating the growing viability of acoustic and low-cost radar defenses.

Source: How to bring down cheap, low-flying drones

Subtitle: Acoustics and innovative radar could help

Dateline: June 4th 2026