Automatic Radio Homing Robot System Exploiting a Switched Beam Antenna

Masashi IZUMI  Yosuke OMORI  Takanari MINAMI  Naoki SAKAI  Takashi OHIRA  

C - Abstracts of IEICE TRANSACTIONS on Electronics (Japanese Edition)   Vol.J98-C   No.12   pp.403-411
Publication Date: 2015/12/01
Online ISSN: 1881-0217
Type of Manuscript: Special Section PAPER (Special Section on Microwave Technologies Launched from Universities)
microwave,  automatic homing,  switched beam antenna,  motor control,  analog circuit,  

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We prototype an automatic radio homing robot exploiting a switched beam antenna. The prototype system consists of a beacon transmitter, a receiver, a switched beam antenna, and a drive unit. The transmitter radiates carrier wave at 2.4GHz modulated with on-off-keying at 1MHz. The receiver has an antenna which can switch between two beams. One beam has a maximum gain of 7.3dBi at an azimuth angle of -20° and a beam width of 85° while the other beam has 6.7dBi at 10° and and 85°. The receiver outputs a DC-voltage in response to received signal strength. The drive unit supplies a voltage to two motors in synchronization with the switched beams. As a result, the prototype of automatic tracking robot successfully tracks the transmitter. Exhibited tracking range reaches 20cm to the receiver.