Combining external patch antenna with Global Positioning System (GPS) portable device is necessary to control raw data quality degradation bonded with low signal strength when receiver is operating at low elevation angle. However, this work has designed an economic data collection system comprising developed adaptive graphical user interface and antenna gain enhancement module that manage the open sky GPS propagation data and characterize the signal-to-noise (SNR) as function of elevation and azimuth angles. The model which will used to characterize received SNR mobile satellite (MS) at Kano and Samarahan, show betterquality signal strength with the other one without external patch antenna, thus provide better services to MS users for this environment.

Abstract-Mobile satellites (MS) propagation is important for the study of satellites signal strength. This paper concentrates on the evaluation of best positioning for the experimental data acquisition system, where a portable commercial Global Positioning System receiver was used in getting the best position. The receiver azimuth angle and elevation angle were utilized in obtaining the best results. The experiment is carried out in an open space area where line-of sight will be visible. Measurement is then performed to determine the relationship between the signal performance with respect to the elevation and azimuth angles. The result obtained from this experiment will be used to set a standard and best positioning for the GPS receiver in collecting data for experimental purpose. Single frequency receivers have the advantage that they are low-cost and CA-code acquisition for civilian access provide higher signal to noise ratio than synthesized P-code acquisition. Since the civilian users can have only access of CA-code, while the P-code in mainly for military users, this kind of receiver was used in this research. Details methodology for doing the experimental works will be discussed. The experiment was conducted at roof top of faculty of engineering building, Universiti Malaysia Sarawak. Therefore, a handheld GPS receiver best positioning experiment designed in order to encourage more experimental works to be carried out in the less developed countries. The analysis of the signal performance under different MS environments is performed with respect to the information such as elevation and azimuth angles.

GPS receivers play an important role for calculating and determining the precise point positioning and deal with the navigational messages. Also, one of the main uses of high-end GPS receivers is for scientific research and space science analysis. The handheld GPS receivers were utilized for experimental purposes contrary to the traditional application for recreation and geo-catching activities. The classification of different commercial GPS receivers gave an inside idea for application and utilization of these receivers in the field of laboratory research. Garmin GPS handheld receivers performed an excellent example in conducting experimental work for GPS propagation data analysis.

Abstract-The effect of ionosphere on mobile satellite (MS) L-band signal which are propagated from the transmitting satellite to the receiver over the equatorial region has attracted much interest. Sarawak which is located near the equatorial region has been selected for the purpose of this research. By means of data acquisition system using the Global Positioning System (