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Field test of susceptibility of aviation GPS receivers to radio frequency interference

机译：航空GPS接收机对射频干扰的敏感性现场测试

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摘要

Susceptibility to Radio Frequency Interference (RFI) of aviation receivers in the GPS L1 band has been investigated in trials flights. With 200mW, the equivalent isotopically radiated power was comparable to common GPS jamming signals. For the first time in Switzerland, civil and military aircraft had the opportunity to investigate the performance of their GPS receivers in realistic jamming scenarios. The analysis of recorded GPS data allows investigating performance parameters. From the transmitting power of a GPS jammer the calculation of the field strength at the GPS receiver is straight forward. Since the GPS antennas are normally located on top of the aircraft and the jamming signal is presumed to be transmitted from the ground, the received power of the RFI can only be estimated. Experiments in the laboratory might not reflect the situation in real environments correctly. In addition, investigations of dynamic effects are costly and are most often not performed. Thus, field trials are required to investigate the effect of jamming signals under real conditions. This paper describes the experimental set-up. Four different types of interference signals were radiated at a biconical broad-bandwidth antenna during predefined times. The bandwidth of the interference signals was limited to 2 MHz around the center frequency of the GPS L1 band. Civil and military organization participated with different aircraft, fixed wing and rotor-craft. Operators with multi-band GPS receivers were instructed to use the L1 band only. Several flights were conducted with active interference signals. As a result, it turned out that most of the GPS receivers were not resistant to three types of the transmitted interference signals, even with a relatively low power of 200mW of the jammer. Those three signals were pseudo random noise sequence, continuous wave and frequency hopping signals. The remaining signal, a pulse with high repetition frequency, seemed not to interfere the GPS signals. Analysis of the recorded data showed that the detection of the interference event is reliable.
机译：在试飞中已经研究了GPS L1频段航空接收器的射频干扰（RFI）敏感性。在200mW的功率下，等效同位素辐射功率可与普通GPS干扰信号相媲美。在瑞士，民用和军用飞机首次有机会研究其GPS接收器在现实干扰情况下的性能。对记录的GPS数据进行分析可以研究性能参数。根据GPS干扰器的发射功率，可轻松进行GPS接收器的场强计算。由于GPS天线通常位于飞机顶部，并且推测干扰信号是从地面发射的，因此只能估计RFI的接收功率。实验室中的实验可能无法正确反映实际环境中的情况。另外，对动态影响的研究成本很高，并且通常不进行。因此，需要进行现场试验来研究干扰信号在真实条件下的影响。本文介绍了实验设置。在预定时间内，双锥宽带天线辐射了四种不同类型的干扰信号。干扰信号的带宽在GPS L1频带的中心频率附近限制为2 MHz。民间和军事组织参加了不同的飞机，固定翼和旋翼飞机。带有多频段GPS接收机的运营商被指示仅使用L1频段。在主动干扰信号下进行了几次飞行。结果，即使使用200mW的较低干扰功率，大多数GPS接收器也无法抵抗三种类型的传输干扰信号。这三个信号是伪随机噪声序列，连续波和跳频信号。其余信号（具有高重复频率的脉冲）似乎不干扰GPS信号。对记录数据的分析表明，干扰事件的检测是可靠的。

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  • 来源
    《European journal of navigation》 |2017年第2期|4-10|共7页
  • 作者

    Pascal Truffer; Maurizio Scaramuzza; Marc Troller;

  • 作者单位

    Skyguide Swiss Air Navigation Services, Wangen bei Duebendorf, Switzerland;

    Skyguide Swiss Air Navigation Services, Wangen bei Duebendorf, Switzerland;

    Skyguide Swiss Air Navigation Services, Wangen bei Duebendorf, Switzerland;

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