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天波超视距雷达(OTHR)目标跟踪面临着“三低”(低检测概率、低数据率、低测量精度)和“多径”(多条传播路径)的严峻挑战,准确的传播模式辨识与精确的目标定位是改善跟踪能力的关键。针对考虑高度信息的目标定位问题,提出了一套不依赖于电离层探测设备的天波超视距雷达与前置接收机(FBRs)量测的关联融合方法,以辨识传播模式并改善含高度的目标定位精度。首先推导了考虑目标高度的坐标变换公式,通过融合FBRs的量测可以获得目标地理位置和电离层高度的初步估计,然后采用极大似然估计准则建立了一套OTHR传播模式和杂波模式的辨识规则,最后利用最小方差估计准则实现OTHR和FBRs关联量测的融合以提高目标定位精度。仿真结果表明:提出的关联融合框架能够有效地辨识传播/杂波模式,同时可以估计出电离层高度和目标高度。此外,通过OTHR和FBRs的关联量测融合有效地改善了目标定位精度。
The sky-wave OTHR target tracking faces the severe challenge of “three low ” (low detection probability, low data rate, low measurement accuracy) and “multipath ” (multiple propagation paths) Identification of propagation patterns and precise targeting are the keys to improving tracking. Aiming at the problem of target location considering the high information, a set of correlation fusion method of sky-wave over-the-horizon radar and pre-receiver (FBRs) measurement that does not depend on ionosphere detection equipment is proposed to identify the propagation mode and improve the height- Target positioning accuracy. First, the coordinate transformation formula considering the height of the target is deduced. The preliminary estimation of the target geographical position and ionosphere height can be obtained by the fusion of the FBRs, and then an OTHR propagation model and a clutter model are established by using the maximum likelihood estimation criterion Finally, the minimum variance estimation criterion is used to realize the fusion of OTHR and FBRs correlation measurement to improve the target location accuracy. Simulation results show that the proposed fusion framework can effectively identify propagation / clutter modes and estimate ionospheric height and target height. In addition, the fusion of OTHR and FBRs correlates the target location accuracy effectively.