QZSS L5 Bandwidth Frequency Filter Design for QZSS Receiver

Journal homepage: http://ejournal.upi.edu/index.php/AJSE/ ASEAN Journal of Science and Engineering 2 (1) (2022) 95-100 © 2021 Universitas Pendidikan Indonesia Pattameak et al., QZSS L5 Bandwidth Frequency Filter Design for QZSS Receiver | 96 DOI: http://dx.doi.org/10. 17509/xxxxt.vxix pISSN 2776-6098 eISSN 2776-5938


A B S T R A C T S
A R T I C L E I N F O The purpose of this study was to design QZSS L5 Bandwidth Frequency Filter for QZSS Receiver. We presented the configuration of the Butterworth bandpass filter by using PSpice as the tool for the simulation. Bandpass filter frequency of the QZSS L5 with bandwidth is designed in 25 MHz using the Butterworth filter which is presented in this article. These designed circuits are composed of the 3rd order. Moreover, the combination between low pass filter and high pass filter is performed as a bandpass filter. In conclusion, this designed filter on the frequency of QZSS L5 is to be useful by using the Butterworth bandpass filter

INTRODUCTION
QZSS was authorized by the Japanese government in 2002. In the beginning, the system was developed by the Advanced Space Business Corporation (ASBC) team, including Mitsubishi Electric Corp., Hitachi Ltd., and GNSS Technologies Inc. When in 2007 ASBC collapsed, the work was taken over by JAXA together with established in February 2007 and approved by the Ministers associated with QZSS research and development (Asari et al., 2021).
The multi-constellation GNSS interoperable signals, L1 C/A, L2C, L5, and L1C, are to be provided based on no direct user fee. Compatibility is a mandatory requirement for the QZSS system, working in the same frequency bands among the multi-GNSS systems without harmful interference. For the GPS performance enhancement signals, L1-SAIF and LEX, a charging policy is under examination. SPAC leads the investigation for L1-SAIF (sub-meter class) and LEX (centimeter class) user terminals.
For bandwidth frequency design on QZSS satellite, it is expected performances are three times better than the specified ones in nominal conditions. Based on our previous studies (Phansori et al., 2021;Chinnapark et al., 2021;Onanong et al., 2021), we presented the QZSS Butterworth bandpass filter for bandwidth frequency design on QZSS satellite to be supported on QZSS applications which are: Mobile mapping, IT aided precise farming, IT aided construction, fleet management, marine and transportation applications, among others. Finally, the QZSS Butterworth bandpass filter is for bandwidth frequency design on a QZSS satellite as a service based on position (see Figure 1).

METHOD
This section of the article has presented the configuration of the Butterworth bandpass filter by using PSpice as the tool for the simulation. Figure 2 shows the design of the circuit used.
From the QZSS L5 signal frequency; = 1164MHz where f0 is the center of frequency, f1 is the lower cut-off frequency, fh is the higher cut-off frequency, 0 is the center of angular frequency, L is the inductor, C is the capacitor, R is the resistor, FSF is the frequency-scaling factor, and Z is the desired impedance level. The designed circuit is as follows in Figure 3. The figure shows the Butterworth bandpass filters.

Result
In this section, the results of the Butterworth bandpass filter circuit for design were presented using PSpice (Figure 4). The output of the band pass filter at -3 dB was between 1,164 and 1,189 MHz.We also showed phase response of bandpass filter, as shown in Figure  5.

Discussion
In this article, the combination of the low pass filter and high pass filter is to perform as the bandpass filter. Therefore, there are two combinations also in designing a bandpass filter. This combination aims to influence the performance of QZSS bandwidth frequency using the Butterworth bandpass filter.

CONCLUSION
Bandpass filter frequency of the QZSS L5 with bandwidth is designed in 25 MHz by using a Butterworth filter which is presented in this poster. These designed circuits are composed of the 3rd order. Moreover, the combination between low pass filter and high pass filter is performed as a bandpass filter. In conclusion, this designed filter on the frequency of QZSS L5 is to be useful using the Butterworth bandpass filter.

ACKNOWLEDGMENTS
We would like to thank class members, the professor in the radio frequency, mixed design subject in Department of Engineering Education, School of Industrial Education and Technology at King Mongkut's Institute of Technology Ladkrabang.

AUTHORS' NOTE
The author(s) declare(s) that there is no conflict of interest regarding the publication of this article. The authors confirmed that the data and the paper are free of plagiarism.