JPS55112609A - Detector for position of moving body - Google Patents

Abstract

PURPOSE: To enable position detection for ground and mobile stations at the same time, by constituting the feedback oscillation circuit when the ground station and the mobile station are coupled with induction and changing the frequency every time the mobile body passes through the branch point between sections of the running path.

CONSTITUTION: The induction lines 1, 1' along the running path are sectioned into the sections of AWD, crossing is made every section point of the section. At the secondary of the coupling transformer 4 coupled to the induction lines 1, 1', the oscillation amplifying circuit 11 of ground station is connected, and the output of the circuit 11 is inputted to the transformer 11 connected to the induction line 2. When the mobile station is on the induction line section, the loop coil 6 is coupled with the induction line 2 and the loop coil 7 is coupled to the induction lines 1, 1'. Two feedback loops of transformer 3-transformer 4-circuit 11-transformer 3 and induction line-coil 6-amplifier 8- coil 7-induction line are formed. The amplification factor and feedback factor of the amplifier are set to a given value, then oscillation is made in frequency f₁ for the sections A, C and in frequency f₂ for the sections B and C, the frequency is discriminated at the discriminators 12, 9 of the ground and mobile station, and the position of the mobile station can be detected by counting the number of times.

COPYRIGHT: (C)1980,JPO&Japio