The following is a sampling of projects recently undertaken by Gulfview Research:
Biomedical Telemetry Receiver
This microcontroller-based scanning VHF data receiver was developed to receive telemetry data from a very-low-power transmitter ingested by a human subject. Since the transmit frequency can drift with time and temperature, the receiver must continually scan a range of frequencies to acquire and follow the data signal. In order to conserve power, the receiver spends most of the time in a low-power shutdown state, waking up periodically to re-acquire the signal and decode the data. The data is then re-transmitted over a low-power UHF link to a central data collection receiver/computer. The receiver, about the size of a pack of cigarettes, is worn by the subject, and can operate for over 500 hours on a single lithium battery.
Amusement Vending Machine
This vending machine accepts input data entered by the user, processes the data, and delivers a printed report containing information extracted from a stored data base. The machine uses a commercial off-the-shelf microprocessor board executing custom application software written in the C programming language. The microprocessor board reads various switches, controls several indicator lights, displays messages on an LCD display module, and outputs information on a small thermal line printer.
This device simulates military UHF communications satellites by providing frequency conversion, attenuation, noise, time delay, and doppler shift. This allows UHF satellite communications transceivers to be tested and evaluated without occupying valuable satellite channels. A custom microcontroller board was developed to control RF synthesizers, programmable step attenuators, a noise source, and a digital signal processor board. The microcontroller board communicates with a commercial off-the-shelf hand-held ASCII terminal via an EIA-232C serial port to implement a menu-driven user interface. The unit can also be controlled remotely by a host computer via a second EIA-232C serial port. The microcontroller board is shown below.
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