| 摘要 |
A personal security system and process for use thereof wherein customers of a security service are provided with personal transmitters capable of selectively transmitting one or more radio signals at a desired frequency, the signals representing the particular character of service that is desired. A number of antenna/transmitters are located in evenly spaced relation in the geographical area and correspond to a computer grid work of the geographical area. The antenna/transmitters receive signals having X and Y axes from the personal transmitters, amplify the signals and transmit them to signal processing equipment. The signal processing equipment includes an automatic direction finding circuit capable of receiving the X and Y axes components of the personal transmitter signal and the vertical elevation of the signal in order to yield an ADF signal output reflecting the location of the signal. The ADF output signal is then processed by means of a computer such that the signal is displayed on a cathode ray tube impressed with a map of the geographical area and the antenna grid work to thus display a signal representing the position of the personal transmitter on a grid of the geographical area. This signal can be further processed to locate the personal transmitter on a small portion of the grid work to thus provide service personnel with the capability of efficiently locating and servicing the signal transmitting customer's needs.
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