Interference with satellite navigation signals over the Middle East is usually told as an aviation story. It is also a telecommunications story. Mobile networks that take their time from satellites share the same weakness, and if they failed, they would fail without a single system being hacked. The Aircraft That Believed It Was Elsewhere In September 2023, pilots flying airway UM688 over northern Iraq saw their Global Positioning System (GPS) position jump by about 60 nautical miles. Within minutes, their inertial reference systems, which are updated from GPS, had lost their position too [1]. This was not jamming, which simply blinds a receiver. It was spoofing: a counterfeit signal that the receiver accepts as genuine. The trend since then is clear. The 2024 safety report of the International Air Transport Association (IATA) recorded a rise of five hundred percent in spoofing incidents compared with the previous year, and named Türkiye, Iraq and Egypt as the areas where interference with satellite navigation is most common [2]. Aircraft, however, are only the most visible receivers. Thousands of others sit on telecommunication towers, and they rely on satellites not to know where they are, but to know what time it is. Time Is a Network Resource Satellite navigation systems, known collectively as the Global Navigation Satellite System (GNSS), carry extremely precise atomic time. A timing receiver on the ground converts that time into a single electrical pulse every second. Mobile base stations, broadcast transmitters and power-grid sensors adjust their own clocks to match it. The approach is inexpensive and remarkably accurate, so over two decades it quietly became the standard time source for mobile networks. Its fragility was demonstrated in January 2016, without any attacker involved. While an old GPS satellite was being retired, a ground-software error corrupted the time correction broadcast to users by about thirteen millionths of a second. Timing receivers raised alarms around the world, and digital broadcasting in the United Kingdom was disrupted for around twelve hours [3]. A Whisper from 20,000 Kilometres A GPS satellite orbits about 20,200 kilometres above the Earth. By the time its signal reaches the ground, it has spread over such a vast area that it is around fifty times weaker than the natural electrical noise inside the receiver itself. The receiver can recover it only because it knows the exact pattern each satellite transmits, and searches for that pattern within the noise. This is elegant engineering, and it is also the source of the weakness. A modest one-watt transmitter ten kilometres away would reach the receiver about ten thousand times stronger than all the satellites combined. A spoofer does not even need that much power. It only needs to be slightly stronger than the real satellites and carefully aligned with them, so that the receiver moves smoothly onto the false signal without noticing. The civilian signal carries no digital signature, so a receiver cannot tell a genuine satellite from a well-made imitation. The Silent Failure Many modern mobile networks use time-division duplexing (TDD), in which sending and receiving share the same frequency and take turns. For this to work, neighbouring towers must switch from transmitting to listening at exactly the same moment. International standards set by the 3rd Generation Partnership Project (3GPP) and the International Telecommunication Union (ITU) allow each tower to drift no more than one and a half millionths of a second from a common reference [4]. In that time, light travels only about 450 metres. Now imagine a spoofer that does not shift the clock suddenly but pulls it slowly, a little every second. The change is too gradual to trigger most alarms, yet within minutes it can use up the entire allowance, while the receiver still reports a healthy signal. The affected tower then keeps transmitting while its neighbours are trying to listen. Its powerful signal drowns out the much weaker signals coming from users’ phones. Calls drop and data speeds fall, yet there is no intrusion to detect and no malicious software to remove. The network is not attacked. It is simply given the wrong time, and it follows it. Designing for the Day the Sky Lies No single technology solves this problem. Protection comes from several independent layers. Backup oscillators, such as rubidium clocks and oven-controlled crystal oscillators, keep time when satellite signals are lost or rejected. The Precision Time Protocol (PTP) can deliver time over fibre-optic links from well-protected central atomic clocks [5]. Receivers that track several satellite systems at once, including GPS, Europe’s Galileo and China’s BeiDou, can compare them against each other. Galileo now adds a digital signature to part of its civilian signal. Specialised antennas can reject signals arriving from the horizon, where ground-based transmitters are located. Finally, monitoring systems can raise an alarm whenever different time sources disagree, rather than only when a signal disappears. The underlying principle is simple: satellite time should be treated as one witness among several, never as the only authority. Timing Sovereignty for Iraq Iraq lies in one of the most contested radio environments in the world, while its mobile networks, banks and electricity grid depend more and more on precise time. Three practical decisions would strengthen its position: a national time reference that does not depend on satellites; distribution of that time over the national fibre-optic network as a regulated service; and licensing rules that require mobile operators to maintain backup timing and to detect spoofing. The aircraft over Iraq did not know where they were. Good engineering must ensure that our networks never lose track of what time it is. References [1] OPSGROUP, “Flights misled over position, navigation failure follows,” September 2023. [2] International Air Transport Association (IATA), Safety Report 2024, as reported by Military & Aerospace Electronics, March 2025. [3] Inside GNSS, “GPS Experiences UTC Timing, IIF Satellite Launcher Problems,” January 2016; Resilient Navigation and Timing Foundation, disruption reports. [4] 3rd Generation Partnership Project (3GPP), Technical Specification TS 38.133; International Telecommunication Union, Recommendation ITU-T G.8271. [5] Microchip Technology, “Synchronizing 5G Networks with Timing Design and Management,” 2023. Al-Mustaqbal University – The First-Ranked University in Iraq Computer Engineering Technologies Department Dr. Musaddak M. Abdul Zahra