G - Physics – 01 – S
Patent
G - Physics
01
S
343/3, 343/69
G01S 5/02 (2006.01) G01S 1/68 (2006.01) G01S 11/10 (2006.01)
Patent
CA 1121488
SYSTEM FOR LOCATING MOBILE OBJECTS IN DISTRESS ABSTRACT OF THE DISCLOSURE A system for location of mobile objects in distress comprises emergency radio stations provided on the mobile objects and energized when these mobile objects are in dis- tress, at least one low orbiting earth satellite for ret- ransmission of the signals from the emergency stations, at least one control station for tracking the earth satellite and determining its ephemeris, and at least one receiving station connected with the control station by a communi- cation link and designed for reproduction of the messages transmitted by the emergency stations and for location of the mobile craft. The emergency radio stations are divided into groups with a specific pattern of the two components of the phase-shift-keyed signal, alternating in accordance with the transmitted message, assigned to each group. The receiving station includes a receiver, a reference-frequen- cy oscillator, signal processing means, their number being equal to that of the groups of emergency stations, and a computer for calculation of the coordinates of the emergen- cy stations, with the input of the computer connected to the communication link. Each of the signal processing means comprises a first filter and a second filter matched with the first and the second components of the signal from one of the groups of emergency radio stations, respectively, and connected to the output of the receiver, a first and a second detectors with their inputs connected to the out- puts of the first and second filters, respectively, an ad- der with the two inputs thereof connected, respectively, to the outputs of the first and second detectors, tracking systems provided with a second-order astaticism for mea- suring the running phase of the envelopes of the received signals from the emergency stations, one of the inputs of each tracking system being connected with the output of the reference-frequency oscillator, and one of its out- puts being connected with the other input of the computer, the tracking systems, for decoding the messages transmit- ted by the emergency stations. The signal inputs of the gates are connected to the output of the adder, the out- put of each of the gates is connected with the other input of one of the tracking systems, the inhibit inputs of each gate being connected with the other outputs of the remai- ning tracking systems. Two inputs of each of the decoders are connected to the outputs of the first and second detec- tors, respectively, while the control input of each deco- der is connected with the other output of one of the trac- king systems. The proposed system provides the capability of simultaneous operation of a large number of emergency radio stations within one common frequency band.
309968
Marks & Clerk
Zhilin Viktor A.
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