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Performance Evaluation of UHF Wireless Digital Gait Monitoring Instrumentation for Long Range Data Transmission

Michael Olusope Alade, Adegbero Sunday Ajani

This paper presents performance evaluation of a UHF wireless Gait monitoring instrumentation system for long distance. This improvised gait monitoring system consists of two basic units; a mobile transmitting unit sending signal at carrier frequency of 869.85 MHz and a stationary receiving unit placed at the base station. The system was implemented using flexi force sensor A201 connected with the aid of appropriate reference resistance to the operational amplifier LM324 whose outputs are fed into 40-pin 8-bit PIC16F877A microcontroller which is connected to the TX3B, 869.85MHz transmitter connected to micro whip antenna and the receive unit which consists of micro whip antenna connected to 869.85MHz RX3A receiver which is connected trough RS-232 line driver to a Laptop computer. Visual C++ computer programming languages were written to run the various processing stages of the signal received. The performance of the system was tested with a number of pathological patients in relative with normal subjects in form of graphical analysis of the data obtained at various intervals of time. The comparison of range of data transmission obtained with the existing ones shows good agreement. The device is highly recommended for applications where quantitative gait measurements are the optimum requirement, especially in situations where long range data transmission is highly desired.