系统温度[System Temperature] - 达人(其实～我是卧底，来自外星)

2005/10/30 | 系统温度[System Temperature]
类别(Ω〖物理〗) | 评论(0) | 阅读(347) | 发表于 11:17: The effective temperature measured in the absence of a signal. It is defined as

where is the receiver temperature, which represents internal noise from the receiving amplifier, and is the noise "antenna temperature" which represents the unwanted noise from the antenna produced by ground radiation, atmospheric attenuation, and other sources. A more complete description is

Table 7-1 in Crane and Napier (1989) gives (now outdated) values for each parameter at the VLA for various frequencies. The system noise for an antenna with a system temperature is, using; 0