With development of anti-stealth technology, meter-wave radar comes into sight of scientific community again due to its natural superiority of anti-stealth and anti-radiation missile. But as strongly influenced by multi- path effect in process of detecting target with low elevation angle, meter-wave radar may obtain a measured height with large deviation that unable to meet actual need. However, the development of data fusion technology in radar network finds a solution to this problem. This paper uses data fusion technology of radar network to realize three-dimensional positioning of target only with distance and azimuth information measured by meter-wave radar, so that the problem of height measurement in meter-wave radar can be well solved. In consideration of effect of earth curvature, the proposed height measurement algorithm of meter-wave radar network utilizes geodetic coordinate transformation, coordinate system transformations, and data transformation to unite all radar's data into one reasonable work platform, namely virtual plane. Height measurement is conducted to target on this plane. Azimuth angle information with not high resolution ratio but good data stability is used to determine hunting zone of algorithm so as to improve minimum error method. The target distance information with high resolution ratio is used to obtain final longitude, latitude and altitude estimate of target. Sometimes target distance estimate may be inaccurate as a result of strong reflection on earth surface, according to which a confidence judgment criterion is established to verify availability of positioning. Through the simulation analysis, the proposed algorithm is verified to obtain a good accuracy in height measurement and can be regarded as an effective method in height measurement for radar network.%随着反隐身技术的发展,米波雷达凭借其反隐身、反辐射导弹方面的天然优势,再度进入科学界的视野.但米波雷达在探测低仰角目标过程中受多路径效应影响严重,导致测高结果易出现较大偏差,无法满足实际需要.而组网雷达数据融合技术的发展为此问题找到了一个解决办法.该文采用组网雷达数据融合技术,仅利用米波雷达测得的距离和方位信息实现了目标的3维定位,从而解决米波雷达测高困难的问题.考虑地球曲率的影响.该文所提出的米波组网雷达测高算法利用大地坐标变换、坐标系变换和数据变换,把各雷达数据统一到一个合理的工作平台,即虚拟平面上,在该平面上对目标进行测高计算.对极小误差法加以改进,采用分辨率不高,但数据稳定性好的方位角信息确定算法的搜索范围;应用分辨率较高的目标距离信息来获取最终的目标经度、纬度、海拔高度估值.由于地面强反射的原因,目标的距离估值有些时候是不准确的,该文设立了置信度判决准则以验证定位的有效性.通过仿真验证,该算法具有较好的测高精度,可作为组网雷达行之有效的测高方法.
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