低复杂度直接定位地面GNSS干扰源的低地球轨道方法
Low-Complexity Direct Geolocation of Terrestrial GNSS Jammers from Low Earth Orbit
AI总结：
提出准直接定位(QDG)技术，大幅降低直接定位复杂度，通过低轨卫星OPS-SAT PRETTY实验验证了对地面干扰源的定位，支持多星座RFI监测。
摘要：
本文介绍了一种名为准直接定位（QDG）的低复杂度技术，用于在位置域直接对发射源进行无源射频（RF）定位，类似于直接定位（DG）和直接位置确定（DPD）。所提出的技术大幅降低了DG/DPD的复杂度，并在Jammertest 2025中通过低地球轨道（LEO）的改造卫星OPS-SAT PRETTY对地面干扰源定位进行了实验验证。QDG的目标是使卫星能够作为全球导航卫星系统（GNSS）频段中的机会频谱传感器，为多星座RF干扰（RFI）监测系统做出贡献，即使这些卫星受限于小尺寸、重量和功率（SWaP）。它们可以作为数据收集器和/或边缘计算机。在前一种情况下，QDG可用于将大量I/Q样本压缩为最小信号信息，通过低容量下行链路中继到地面进行后处理。在后一种情况下，QDG可用于在轨低功耗星载计算机（OBC）上计算RFI源的地理位置。这些能力的缺点是灵敏度和精度低于DG/DPD，并且对可定位的信号源类型有限制，但尽管如此，仍包括最常见的GNSS干扰源。
英文摘要：
This paper introduces a low-complexity technique named quasi-direct geolocation (QDG) to perform passive radio-frequency (RF) geolocation of emitters directly in the position domain, akin to direct geolocation (DG) and direct position determination (DPD). The proposed technique drastically reduces the complexity of DG/DPD and is experimentally demonstrated in geolocating a terrestrial jammer at Jammertest 2025 from a repurposed satellite in low Earth orbit (LEO): OPS-SAT PRETTY. The goal of QDG is to enable satellites to contribute to a multi-constellation system for RF interference (RFI) monitoring as opportunistic spectrum sensors in global navigation satellite systems (GNSS) bands, even if these are constrained by low size, weight, and power (SWaP). They can serve as data collectors and/or edge computers. In the former case, QDG can be used to compress large volumes of I/Q samples into minimal signal information, which can be relayed to ground for post-processing via low-capacity downlinks. In the latter case, QDG can be used to compute the geolocation of RFI sources in orbit on low-power on-board computers (OBC). The drawback of these capabilities is lower sensitivity and accuracy than DG/DPD plus limitations on the types of signal sources that can be geolocated, which, nonetheless, include the most common GNSS jammers.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
