System and method to locate radiomobiles outside the coverage of a cellular network
First Claim
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1. A method for detecting at least one mobile in a standby mode, comprising:
- searching with a moving search device located at a varying altitude above said at least one mobile;
simulating, at said moving search device, a cellular network to activate said at least one mobile, wherein said simulating comprises repeatedly changing the Location Area Identification of a broadcast channel of the simulated network to force said at least one mobile to repeat location updating procedures by simulating a change of cell;
using a flat plate or trihedral antenna equipped with N radioelectric sensors to detect at least one signal transmitted by said at least one mobile;
taring a plurality of reception channels of said antenna with a frequency generator, wherein said antenna and said frequency generator are positioned as close as possible to one another, and said frequency generator is used for self-calibration of reception systems up to signal digitization; and
determining at least one parameter representative of said at least one signal transmitted by said activated at least one mobile.
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Abstract
A method and system for detecting and locating at least one mobile in a standby mode using a search device located at a certain altitude above the at least one mobile. A simulation of a cellular network activates the at least one mobile within range of the simulated network. At least one parameter representative of at least one signal transmitted by the activated at least one mobile is determined.
41 Citations
17 Claims
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1. A method for detecting at least one mobile in a standby mode, comprising:
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searching with a moving search device located at a varying altitude above said at least one mobile; simulating, at said moving search device, a cellular network to activate said at least one mobile, wherein said simulating comprises repeatedly changing the Location Area Identification of a broadcast channel of the simulated network to force said at least one mobile to repeat location updating procedures by simulating a change of cell; using a flat plate or trihedral antenna equipped with N radioelectric sensors to detect at least one signal transmitted by said at least one mobile; taring a plurality of reception channels of said antenna with a frequency generator, wherein said antenna and said frequency generator are positioned as close as possible to one another, and said frequency generator is used for self-calibration of reception systems up to signal digitization; and determining at least one parameter representative of said at least one signal transmitted by said activated at least one mobile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for detecting at least one mobile located at a limit of or outside a cellular communication network, comprising:
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a simulating device configured to simulate a cellular communication network and activate at least one mobile in a standby mode within a range of the simulating device, the simulating device also being configured to move at a higher altitude relative to said at least one mobile, and to repeatedly change the Location Area Identification of a broadcast channel of the simulated network to force said at least one mobile to repeat location updating procedures by simulating a change of cell; a flat plate or trihedral antenna equipped with N radioelectric sensors to detect at least one signal transmitted by said at least one mobile; a frequency generator configured to tare a plurality of reception channels of said antenna, wherein said antenna and said frequency generator are positioned as close as possible to one another, and said frequency generator is configured to perform self-calibration of reception systems up to signal digitization; a locating device configured to locate at least one mobile located outside said cellular communication network; and a signal processing device. - View Dependent Claims (10, 11)
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12. A method for detecting at least one mobile in a standby mode at the limit of or beyond a network of said at least one mobile, comprising:
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moving a network simulator arranged in a search vehicle over a search area at a varying altitude; activating said at least one mobile using said network simulator, wherein said network simulator is configured to repeatedly change the Location Area Identification of a broadcast channel of the simulated network to force said at least one mobile to repeat location updating procedures by simulating a change of cell; using a flat plate or trihedral antenna equipped with N radioelectric sensors to detect at least one signal transmitted by said at least one mobile; taring a plurality of reception channels of said antenna with a frequency generator, wherein said antenna and said frequency generator are positioned as close as possible to one another, and said frequency generator is used for self-calibration of reception systems up to signal digitization; and determining an angular direction of said at least one signal expressed by either or both of an angle of elevation and an azimuth angle. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification