Abrégé

A computerized machine (a) determines temporal and spatial confidence intervals for each one of plural sonic events, (b) classifies pairings among the sonic events as either comparable or non-comparable, and (c) estimates a minimum number of sonic sources, some of which are in motion, that could have produced or generated the sonic events. Sonic event times and positions are characterized by corresponding temporal and spatial confidence intervals. A pairing of sonic events is classified as comparable only when that pairing meets one or more preselected constraints, some of which depend on the temporal and spatial confidence intervals. The estimated minimum number of sonic sources is equal to the total number of sonic events minus the cardinality of a maximum matching of a bipartite graph derived from the classifications of the pairings and a chronological ordering of the set of sonic events.

Classes IPC  ?

• G01S 5/18 - Localisation par coordination de plusieurs déterminations de direction ou de ligne de positionLocalisation par coordination de plusieurs déterminations de distance utilisant des ondes ultrasonores, sonores ou infrasonores
• G06K 9/62 - Méthodes ou dispositions pour la reconnaissance utilisant des moyens électroniques
• A01K 11/00 - Marquage des animaux
• A01K 61/90 - Triage, classement, comptage ou marquage des animaux vivants, p. ex. identification de leur sexe
• G06K 9/00 - Méthodes ou dispositions pour la lecture ou la reconnaissance de caractères imprimés ou écrits ou pour la reconnaissance de formes, p.ex. d'empreintes digitales
• G01V 1/00 - SéismologieProspection ou détection sismique ou acoustique
• G06V 20/64 - Objets tridimensionnels

Abrégé

A computerized machine (a) determines temporal and spatial statistical characterizations for each one of plural sonic events, (b) classifies certain pairings among the sonic events as comparable, and (c) estimates a minimum number of sonic sources, some of which are in motion, that could have generated the sonic events. Sonic event times and positions can be characterized by corresponding temporal and spatial confidence intervals. A pairing of sonic events is classified as comparable only when that pairing meets one or more preselected constraints, some of which depend on the temporal and spatial statistical characterizations. The estimated minimum number of sonic sources is equal to the number of sonic events in a longest antichain within a chronological ordering of the set of sonic events. An antichain comprises a subset of the sonic events for which no pairing of sonic events of that subset is a comparable pairing.

Classes IPC  ?

• G06K 9/00 - Méthodes ou dispositions pour la lecture ou la reconnaissance de caractères imprimés ou écrits ou pour la reconnaissance de formes, p.ex. d'empreintes digitales
• G06F 17/18 - Opérations mathématiques complexes pour l'évaluation de données statistiques
• G06K 9/62 - Méthodes ou dispositions pour la reconnaissance utilisant des moyens électroniques
• A01K 61/90 - Triage, classement, comptage ou marquage des animaux vivants, p. ex. identification de leur sexe
• G01V 1/00 - SéismologieProspection ou détection sismique ou acoustique

Abrégé

A method implemented using a programmed computerized machine includes using an estimated uncorrected time-difference-of-arrival (TDOA) for a first signal at first and second sensors, located at first and second sensor locations and coupled to first and second clocks, to calculate a first estimated clock synchronization error (CSE) range that extends (i) from an estimated minimum true TDOA between the sensor locations minus an estimated maximum uncorrected TDOA, (ii) to an estimated maximum true TDOA between the sensor locations minus an estimated minimum uncorrected TDOA. Additional estimated CSE ranges based on additional signals can be used to calculate an estimated cumulative CSE range. A first or cumulative estimated CSE range can be used for calculations with respect to time-dependent signals arriving at one or both sensors, or for adjusting one or both clocks.

Classes IPC  ?

• G06F 1/10 - Répartition des signaux d'horloge
• G06F 1/12 - Synchronisation des différents signaux d'horloge

Abrégé

Multistatic active coherent sonar systems and methods include reception by floating receiver sonobuoys of acoustic signals emitted by floating source sonobuoys, by both direct propagation from the source sonobuoys and reflection or scattering from a target object. Subsequent calculations based at least in part on those signals can be employed to estimate relative or absolute positions or velocities of the target object and the source and receiver sonobuoys. The estimated relative velocities and positions can be calculated without relying on GPS or other extrinsic positioning signals acquired for each sonobuoy after its deployment. Acoustic signals emitted by a stationary source on the seabed, received by a stationary receiver on the seabed, or reflected/scattered from a bathymetric feature, can be employed to estimate absolute or relative positions or velocities of the target object and the source and receiver sonobuoys.

Classes IPC  ?

• G01S 15/00 - Systèmes utilisant la réflexion ou la reradiation d'ondes acoustiques, p. ex. systèmes sonar
• G01S 13/86 - Combinaisons de systèmes radar avec des systèmes autres que radar, p. ex. sonar, chercheur de direction
• G01S 3/808 - Systèmes pour déterminer une direction ou une déviation par rapport à une direction prédéterminée utilisant des transducteurs espacés et mesurant la différence de phase ou de temps entre les signaux provenant de ces transducteurs, c.-à-d. systèmes à différence de parcours
• G01S 11/16 - Systèmes pour déterminer la distance ou la vitesse sans utiliser la réflexion ou la reradiation utilisant la différence de temps de transit entre des ondes électromagnétiques et des ondes sonores