Abstract: System and method are provided for estimating attitude and angular rate of a spacecraft with greater accuracy by obtaining star field image data at smaller exposure times and processing the data using algorithms that allow attitude and angular rate to be calculated during the short exposure times.

Abstract: According to one embodiment of the present invention, an apparatus for automatic identification of celestial bodies comprises an imager and logic encoded in media. The imager is operable to accept incoming light from celestial bodies and produce a digital image. The logic encoded in media is operable to identify centroids of the celestial bodies within the digital image, and identify the celestial bodies by comparing angles derived from the centroids with catalogued values. The imager and the logic encoded in media are contained in a first enclosure. The first enclosure is sized to be held in a hand of a user or in a telescope mount.

Abstract: A line tracer is disclosed comprising a transmitter for generating a signal in a target pipe, a cable set, a detector for amplifying the signal and filtering unwanted electronic noise, and a method for employing the line tracer. The transmitter further comprises a transmitter circuit board having a pulse generation circuit, a tone generation circuit and a transformer drive circuit. The transmitter circuit board is tuned to provide a pulse frequency of approximately 1.3 Hz and a tone rate of approximately 600 Hz. The detector further comprises a detector circuit board having a difference amplifier, a first high pass filter, a second high pass filter, a non-inverting amplifier, and a sensitivity meter. The detector circuit board is designed to amplify the detected signal and to achieve an attenuation of frequencies from 0 Hz to 400 Hz that is 80 dB/decade. The detector provides a visual indicator of signal strength.

Abstract: A line tracer is disclosed comprising a transmitter for generating a signal in a target pipe, a cable set, a detector for amplifying the signal and filtering unwanted electronic noise, and a method for employing the line tracer. The transmitter further comprises a transmitter circuit board having a pulse generation circuit, a tone generation circuit and a transformer drive circuit. The transmitter circuit board is tuned to provide a pulse frequency of approximately 1.3 Hz and a tone rate of approximately 600 Hz. The detector further comprises a detector circuit board having a difference amplifier, a first high pass filter, a second high pass filter, a non-inverting amplifier, and a sensitivity meter. The detector circuit board is designed to amplify the detected signal and to achieve an attenuation of frequencies from 0 Hz to 400 Hz that is 80 dB/decade. The detector provides a visual indicator of signal strength.