针对星间交叉定标和地面固定场地交叉定标两种辐射定标方案，利用卫星的轨道参数建立了交叉定标轨道模型，提出了定标交叉频次的计算方法。研究了各轨道参数对交叉频次的影响程度，经过分析限定了轨道高度、升交点赤经、纬度幅角是影响交叉频次的主要因素。提出了基于遗传算法的服务于多目标载荷轨道的基准载荷轨道优化方法，通过选择合适的适应度函数，优化得到的基准载荷轨道相较于未优化前，单位仿真周期内总体交叉频次和对各目标载荷的交叉均匀度都有明显改善。仿真分析结果有助于开展服务多目标载荷的基准载荷轨道优化设计。

Aiming at the two radiometric calibration schemes of inter-satellite cross-calibration and fixed ground site cross-calibration, the cross-calibration orbit model is established by using the orbit parameters of the satellite. And the calculation method of calibration crossing frequency is proposed. The influence degree of each orbit parameter on the crossing frequency is studied. After analysis, it is limited that the height of the orbit, the right ascension of the ascending node and the argument of latitude are the main factors affecting the crossing frequency. A reference payload orbit optimization method serving multi-objective payload orbit based on genetic algorithm is proposed. By selecting the appropriate fitness function, the overall crossover frequency and crossover uniformity of each target payload in the unit simulation cycle are significantly improved compared with that before optimization. The simulation results are helpful to carry out the reference payload orbit optimization design for serving multi-objective payload.