Positional Estimation of Obstacles and Aircraft by Using ISDB-T Signal Delay

This paper is concerned with positional estimation of obstacle and aircraft by using ISDB-T signal delays. Recently, Multi-Static Primary Surveillance Radar (MSPSR) has been expected to be used as primary surveillance radar alternative. MSPSR classified into passive bistatic radar uses not only conventional radar signal but also other communication signals. Among them, Digital Terrestrial Television Broadcasting (DTTB) is the most expected radio waves because it has high transmitted power. We have started the feasibility study of MSPSR using DTTB signal. Our system concept is to use original characteristics of DTTB. Since Japanese DTTB employs OFDM and guard interval, delayed signals caused by obstacles can be separated. In this paper, we discuss the positional estimation of obstacles and aircraft. This leads to the validation of the proposed method. Firstly, Japanese DTTB signal types of ISDB-T is introduced. Then, the principle of positional estimation is discussed. Positional estimation is started from detection of delayed signals, and positions are determined by bistatic ranging. Finally, delay profiles and bistatic ranging are shown in experimental results. Those results indicate that our proposed system concept would be useful for estimating obstacle and aircraft positions.