利用DME问答时序的飞机无源定位

针对多基测角交会、时差相差、时差频差定位系统复杂度高、同步要求高的问题，利用测距机（DME）系统测距模式中飞机与台站的通联关系，提出了一种对飞机无源定位的方法。已知地面DME台站位置和本机侦测点位置，通过对飞机地空测距询问信号、台站距离应答信号的到达时间、方位进行测量并进行解码分选，对解码分选结果进行关联聚类，再利用DME测距工作模式的随机询问特性进行询问-应答信号的时序匹配，最后根据配对信号的到达时间差、DME台站位置以及飞机方位对飞机进行计算定位。通过仿真分析证明了该方法的可行性，在固定DME台站位置已知的条件下该方法具有工程实践意义。

Passive location of aircraft based on DME inquiry replying sequence

As the high complexity and high synchronization requirement of the multi-angle intersection,time and phase difference,time and frequency difference location system,this paper proposes a passive aircraft location method by using the communication relationship between aircraft and distance measuring equipment(DME) stations when they work in distance measurement mode.It considers the condition that the position of the DME station and detect station is known,measures the arrival time and azimuth of the distance measurement inquiry signal from aircraft and the DME station reply signal,clusters the decoding and sorting result,then matches the inquiry-reply time sequence according to the random inquiry characteristics of the DME distance measurement mode,finally calculates the location of aircraft using the difference of arrival time of the matched signals,the location of the DME station and the azimuth of aircraft.The feasibility of the method is proved by simulation analysis.The method is of practical engineering significance under the condition that the position of DME station is known.