| 摘要 |
PCT No. PCT/EP97/00234 Sec. 371 Date Nov. 12, 1997 Sec. 102(e) Date Nov. 12, 1997 PCT Filed Jan. 20, 1997 PCT Pub. No. WO97/26552 PCT Pub. Date Jul. 24, 1997A device for monitoring the distance between two objects, at least one of which is a moving object having transmission units carried by the two objects and receiving units carried at least by moving object, the transmission units transmitting position data signals for carrying object and an identification signal associated with the carrying object, and the receiving unit receiving the position data signals and object identification signals of other object, wherein the moving object carries a GPS unit which supplies the position data signals; wherein the transmission units and the receiving unit operate in the VHF range and each comprise an antenna with a substantially spherical operating characteristic; and wherein the transmission units have identical transmitting power and the receiving units are connected to a discriminator circuit which rejects received signals of an amplitude below a preset threshold value, and at least the moving object carries a monitoring computer which, from the position data signals of the moving object and the received position data signals of the other object, calculates the distance between the two objects.
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