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低信噪比情况对空间点目标的识别仍然是很困难的问题，尤其在区分卫星目标和系留诱饵等干扰时尤为困难。此时系留诱饵与目标具有相同的运动轨迹和相似的外形特性，因而所能利用的差异仅有辐射特性差异。然而提取多光谱辐射差异并不是简单的问题，尤其是辐射会受到探测距离、探测角度的影响。基于目标和诱饵等干扰具有不同辐射强度及辐射变化频率的特点，建立了空间目标等效黑体温度的概念。并相应的设计了等效黑体温度的计算模型，该模型可以有效的减小空间环境的干扰而充分体现目标和诱饵等干扰的辐射差异。然而由于噪声的干扰，此模型会产生计算误差，并且不同的探测波段组合具有不同的误差传递能力。为了使这种噪声引起的误差最小，需要确定最佳的探测波段。通过计算噪声存在情况下，误差随探测波段参数的变化趋势，获得了最佳探测双波段、最佳探测多波段和最佳探测波段数。通过分析仿真实验的结果，使用最佳探测双波段可以减小20%的误差，而最佳探测多波段会进一步的减小20%的误差，这种结果证明了文中研究结论的正确性。“,”In low SNR cases, the distinction between spatial point-target and interferences like decoys is still a very difficult problem, especial between the satellites target and mooring decoys. At that time decoys have the same orbit and similar shape with the spatial target, so that only could be used to distinguish the target is the radiation difference. However it is not easy to extract the multi-spectral radiation which is influenced by the detection distance and observation angle. In this paper, based on the characteristics that target and interferences like decoys and noise have different radiation intensity and radiation changing frequency, the concept of the equivalent blackbody temperature in several bands (EBTSB) was built. Then the calculation model of EBTSB was designed, which could effectively reduce the interference of the space environment and fully showed the radiation differences between point-target and interferences like decoys. Under noises interference, this model would produce calculation error, and different bands combinations had different error transmission capacity. In order to make error minimum, the best detection bands need to be determined. In this paper, the best detection dual-bands and the best detection multi-bands were obtained by calculating the trend of error with the band parameters under noises interference. By analyzing the results of the simulation experiments, the best detection dual-band will have 20% advantage and the best detection multi-bands will further reduce error 20%, which prove the correctness of the conclusions of this paper.