Satellite interference location system using on-board multibeam antenna

Study of interference localization using single satellite based on signal strength distribution in multi-beam antenna for satellite communications system

“…Compared with the beam diameter 524 km, it is about one-tenth of the beam width, and the performance is equivalent with it in Matsumoto. 8 The location error is about 20 km when the signal strength measurement error is down to 0.6 dB, which outperforms that in Matsumoto. 8 From the above, the localization method can achieve finding the interference source without the help of other equipments onboard.…”

“…8 The location error is about 20 km when the signal strength measurement error is down to 0.6 dB, which outperforms that in Matsumoto. 8 From the above, the localization method can achieve finding the interference source without the help of other equipments onboard. There are two ways for the equation set solving: one is MLISM and the other is Newton iteration based on least square method.…”

“…Compared with the literature, 8 the similarity is as follows. In the multi-beam satellite communications system, the uplink interference waves received by the separate beams onboard are frequency multiplexed and are transmitted to the ground.…”

“…However, the differences are as follows. Viewed from the perspective of localization principle, in Matsumoto, 8 the angle measurement based on amplitude comparison among multiple beams is applied to localization system, whose interference is overlapping with the communication signals received by the multi-beam satellite antenna. However, in this article, the location of the interference source is given by measuring the relative ratio of the received signals strength and building and solving the mathematical equation set.…”

“…The former derives time difference of arrival (TDOA) along with phase measurements to localize an unknown interference using two satellites. Direction finding location [6][7][8][9] is preferred in single satellite localization, including direction finding by phase interferometer, phase comparison direction finding, amplitude comparison direction finding, time difference direction finding, spatial spectrum estimation, and so on.…”