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1. 发明授权

US4874937A Digital sun sensor 失效
标题翻译：数码太阳传感器
公开(公告)号：US4874937A
公开(公告)日：1989-10-17
申请号：US23719
申请日：1987-03-09
申请人： Tsuguhiko Okamoto
发明人： Tsuguhiko Okamoto
IPC分类号： B64G1/36 , G01C1/00 , G01C17/34 , G01C21/24 , G01S3/78 , G01S3/783 , G01S3/784 , G02B7/182 , G05D1/08
CPC分类号： G01S3/7835 , G01C17/34 , G01S3/784
摘要： A digital sun sensor having an ND filter, a prism, an opaque layer formed on the prism and having a slit, a band-pass filter, and a linear array sensor. A sunbeam passes through ND filter, and is diffracted as it passes through the slit, and is refracted by prism. The diffracted sunbeam, which has a specified wavelength, passes through the band-pass filter and reaches the linear array sensor. The sensor is driven by a first clock signal, thereby generating electrical signals. An automatic gain control circuit maintains these signals at a constant peak value. The output signal of automatic gain control circuit is compared with a reference level. When this output is at a level lower than the reference level, the first clock signal is supplied to an N-bit counter. When the output is at a level higher than the reference level, a second clock signal having a frequency half that of the first clock signal is supplied to the N-bit counter. N-bit counter counts the pulses of either clock signal. Any pulse of the second clock signal, that has been counted by the counter, is input to the lowest bit-input terminal of an (N+1)-bit latch circuit, and the pulses of the first clock signal, which have been counted by the counter, are input to the other N-bit input terminals of the latch circuit.
摘要翻译：具有ND滤光器，棱镜，形成在棱镜上的具有狭缝的不透明层，带通滤光器和线性阵列传感器的数字太阳传感器。阳光通过ND滤光片，并在穿过狭缝时衍射，并被棱镜折射。具有指定波长的衍射光束通过带通滤光片并到达线阵列传感器。传感器由第一时钟信号驱动，从而产生电信号。自动增益控制电路将这些信号保持在恒定的峰值。将自动增益控制电路的输出信号与参考电平进行比较。当该输出处于低于参考电平的电平时，第一个时钟信号被提供给N位计数器。当输出处于比参考电平高的电平时，具有第一时钟信号的频率的一半的第二时钟信号被提供给N位计数器。 N位计数器计数任一个时钟信号的脉冲。由计数器计数的第二时钟信号的任何脉冲被输入到第（N + 1）位锁存电路的最低位输入端，并且已经计数的第一时钟信号的脉冲由计数器输入到锁存电路的其它N位输入端。

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