Journal of Systems Engineering and Electronics ›› 2022, Vol. 33 ›› Issue (1): 28-37.doi: 10.23919/JSEE.2022.000004

• ELECTRONICS TECHNOLOGY • Previous Articles     Next Articles

Range resolution and sampling frequency trade-off for GPS passive radar

Zhuxian ZHANG1,2(), Yu ZHENG2(), Linhua ZHENG1,*(), Peidong ZHU2()   

  1. 1 College of Electronic Science, National University of Defense Technology, Changsha 410073, China
    2 College of Electronic Communication and Electrical Engineering, Changsha University, Changsha 410022, China
  • Received:2020-12-15 Accepted:2021-11-29 Online:2022-01-18 Published:2022-02-22
  • Contact: Linhua ZHENG E-mail:zxzhang@ccsu.edu.cn;y_zheng170@sina.com;lhzheng131@sohu.com;pdzhu@nudt.edu.cn
  • About author:|ZHANG Zhuxian was born in 1984. She received her M.S. degree in telecommunication from Melbourne University in 2009. She is now a Ph.D. candidate in National University of Defense Technology. Her main research in GNSS passive radar sensing include static and dynamic object detection. E-mail: zxzhang@ccsu.edu.cn||ZHENG Yu was born in 1989. He received his B.E. degree and M.S. degree from Xiangtan University, China and University of Alberta, Canada in 2012 and 2014, respectively. In 2015, he joined the Department of Land Surveying and Geo-informatics, Hong Kong Polytechnic University as a Ph.D. student. He received his Ph.D. degree in 2018. Now he is a lecturer in the College of Electronic Communication and Electrical Engineering, Changsha University. His major research interests including environmental sensing using GNSS signals as source of opportunity and indoor location and surveillance using commercial devices. E-mail: y_zheng170@sina.com||ZHENG Linhua was born in 1961. He received his Ph.D. degree from the College of Electronic Science and Engineering, National University of Defense Technology, Changsha, China. Currently he is a full professor with the same institution. He has published eight monographs and textbooks and over 100 technical papers. His research interests are wireless communication system, satellite communication, and radar signal processing. E-mail: lhzheng131@sohu.com||ZHU Peidong was born in 1971. He received his Ph.D. degree in the College of Computer Science and Technology, National University of Defense Technology, Changsha, China in 1999. After that, he has been a faculty member in the same institution from lecturer to full professor. He was a visiting chair professor in Saint Xavier University from 2008 to 2009. Now he is a full professor and departmental head for the College of Electronic Communication and Electrical Engineering, Changsha University, Changsha, China. His main research interests are wireless communication networks and security assessment for radar network. E-mail: pdzhu@nudt.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (42001297), the Research Foundation of Education Department of Hunan Province (19B061) and the National Natural Science Foundation of Hunan Province (2021JJ40631)

Abstract:

In a global positioning system (GPS) passive radar, a high resolution requires a high sampling frequency, which increases the computational load. Balancing the computational load and the range resolution is challenging. This paper presents a method to trade off the range resolution and the computational load by experimentally determining the optimal sampling frequency through an analysis of multiple sets of GPS satellite data at different sampling frequencies. The test data are used to construct a range resolution-sampling frequency trade-off model using least-squares estimation. The theoretical analysis shows that the experimental data are the best fit using smoothing and nth-order derivative splines. Using field GPS C/A code signal-based GPS radar, the trade-off between the optimal sampling frequency is determined to be in the 20 461.25–24 553.5 kHz range, which supports a resolution of 43–48 m. Compared with the conventional method, the CPU time is reduced by approximately 50%.

Key words: global positioning system (GPS) radar, range resolution, sampling frequency, trade-off