The Interference Analysis and Evaluation of DME to BeiDou-3/B2a

DME is a kind of important equipment for air route navigation and landing guidance. It has high transmitting power, a large number of installations, a wide range of signal coverage region, and also works at same frequency band with BeiDou-3/B2a signal. DME will interfere the weak satellite navigation signal. In order not to affect the signal capture, improve BeiDou receiver carrier tracking and code tracking accuracy, and reduce BER (Bit error rata), it is especially necessary to carry out the analysis and evaluation of DME to BeiDou-3/B2a signal interference and suppression measures research. Here, through the analysis of characteristics of DME and BeiDou-3/B2a signal, based on RTCA/DO-292 standard about radio signal on GPS/L5, Galileo/E5a interference impact analysis, proposed DME on BeiDou-3/B2a signal interference effective carrier-to-noise ratio degradation evaluation ideas and analysis methods. Based on the effective carrier-to-noise degradation algorithm model, DME to BeiDou-3/B2a signal interference evaluation was carried out for two hundred and five DME ground beacons co-located with VOR (Very-high-frequency Omnidirectional Range) for air route navigation in China. The interference evaluation method of DME to BeiDou-3/B2a in the paper provides technical guarantee for improving accuracy, availability, continuity and integrity of BeiDou navigation system, carrying out research on interference suppression measures and BeiDou system application.