Designing a water-quality monitor using an array of ion selective electrodes
This effort is directed at developing a sensor for evaluating water quality.
ISE water quality monitor↗
Engineering topics
Martin, D. P.
Publications and source records attributed to Martin, D. P..
System architecture study of an orbital GPS user terminal
The generic RF and applications processing requirements for a GPS orbital navigator are considered. A line of demarcation between dedicated analog hardware, and software/processor implementation, maximizing the latter is discussed. A modular approach to R/PA design which permits several varieties of receiver to be constructed from basic components is described. It is a basic conclusion that software signal processing of the output of the baseband correlator is the best choice of transition from analog to digital signal processing. High performance sets requiring multiple channels are developed from a generic design by replicating the RF processing segment, and modifying the applications software to provide enhanced state propagation and estimation.
Martin, D. P.↗
A combined radar-radiometer with variable polarization
An instrument is described that provides both radar and radiometer data at the same time. The antenna and receiver are time shared for the two sensor functions. The antenna polarization can be electronically scanned at rates up to 5000 changes for both the transmit and receive signal paths. This equipment is to investigate target signatures for remote sensing applications. The function of the equipment is described and the results for observations of asphalt, grass, and gravel surfaces are presented.
Martin, D. P.↗