System for broadcasting marker beacon signals and processing responses from seeking entities

• US 5,515,061 A
• Filed: 03/23/1994
• Issued: 05/07/1996
• Est. Priority Date: 03/23/1994
• Status: Expired due to Fees

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Wilson, Charles E., Hiltz, Frederick F.
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): PHAN, DAO LINDA
• Application Number:
  US08/216,567
• Time in Patent Office: 776 Days
• Field of Search: 342/385, 342/386, 342/419, 342/44, 342/45
• US Class Current: 342/385
• CPC Class Codes: G01S 1/68 Marker, boundary, call-sign, or like beacons transmitting signals not carrying directional information
• CPC Class Codes: G01S 1/70 using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 1/7038 Signal details
• CPC Class Codes: G01S 2201/01 adapted for specific applications or environments

Abstract

A target electronic system forms part of a marker beacon. The target systemids in detecting the marker beacon upon deployment. A seeking electronic system for locating the target system may be mounted on an air vehicle, land vehicle, sea vehicle, or backpack. The target system, upon deployment of the marker beacon, sends out signals identifying the marker beacon'"'"'s use, identity, and direction. The seeking system then responds by querying the target system of its distance. The target system then responds to this query. The seeking system then has the option of sending a signal to have the target system initiate the activation of a flare. The activated flare can then be used for visual and infrared detection.

Claims

1. An electronic system of special utility as a component of a marker beacon whose presence is intended to be nominally secure from unfriendly seekers and whose operation with authorized seeking entities follows a predetermined scenario comprising a sequence of transmission signal categories transmitted between the beacon and an authorized seeking entity, said system comprising:

a mode and code means for generating coded pulses capable of selectively representing a plurality of beacon uses and capable of selectively representing beacon unit identity, said coded pulses being transmitted as a first category transmission signal;

multiple role signal sensing means the function of which includes receiving a second category transmission signal emanating from an authorized seeking entity, said second category signal being actuated in response to said transmission of said first category transmission signal, said signal sensing means being operative during a predetermined time frame following the transmission of said first category transmission signal;

distance interrogation decode circuit means connected to said multiple role signal sensing means for determining if said second category transmission signal meets a predetermined distance interrogation decode criteria;

distance pulse transmission means for generating a third category signal actuated upon said second category transmission signal meeting the distance interrogation decode criteria;

the function of said multiple role signal sensing means further including receiving a fourth category transmission signal following generation of said third category transmission signal;

ignition decode circuit means connected to said multiple role signal sensing means for generating an electrical energy pulse upon determining said fourth category transmission signal meets a predetermined ignition decode criteria; and

activation means connected to said ignition decode circuit means for becoming operative upon receipt of said electrical pulse from said ignition decode circuit means.

5. An electronic system of special utility as a component of a marker beacon according to claim 1 wherein said ignition decode circuit means comprises a flare ignition decode circuit and said activation means comprises a squib within flare material, said squib being connected to said flare ignition decode circuit and said squib detonating and igniting said flare material upon receipt of said electrical pulse from said flare ignition decode circuit.

2. An electronic system of special utility as a component of a marker beacon according to claim I wherein said mode and code means further comprises:

an oscillator;

a countdown circuit connected to receive signals from said oscillator;

a mode generator having a mode selector and mode generating means connected to receive signals from said oscillator for generating coded pulses representing one of a predetermined set of scenarios of beacon application as selected by said mode selector;

code generating means having a code selector connected to receive signals from said countdown circuit and said mode generating means for generating coded pulses representing beacon unit identity as selected by said code selector;

an OR circuit connected to said mode generating means and said code generating means;

a pulse generator connected to said OR circuit for controlling the transmission time;

a modulator connected to said pulse generator for modulating the signals received from said pulse generator; and

transmission means connected to said modulator for transmitting the modulated signals from said modulator.

3. An electronic system of special utility as a component of a marker beacon according to claim 2 wherein said transmission means further comprises a serial connection of a transmitter, a duplexer, and a monopole antenna for transmitting said first category transmission signal as a radio signal.

4. An electronic system of special utility as a component of a marker beacon according to claim 3 wherein said multiple role signal sensing means further structurally comprises:

a one-shot multivibrator connected to said code generator for generating a gate signal;

said monopole antenna for receiving said second category transmission signal as a radio signal;

said duplexer serially connected to said monopole antenna;

a receiver comprising bandpass filtering and signal amplification serially connected to said duplexer, said receiver further connected to receive said gate signal from said one-shot multivibrator and becoming operative only during receipt of said gate signal; and

an RF processor connected to receive and demodulate signals from said receiver.