Passive secondary surveillance radar (ssr)system utilizing...

G - Physics – 01 – S

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G01S 13/93 (2006.01) G01S 3/02 (2006.01) G01S 13/76 (2006.01)

Patent

CA 2088725

The range from which a collision avoidance system at an Own station can receive secondary surveillance radars (SSR) interrogations and reply messages from Other stations, is extended by utilizing P2 pulses for timing time of arrival (TOA) measurement in the event P1-P3 pulse pairs are unavailable from the scanning main beam or its side lobes. The amplitude of the P2 pulses in the SLS radiation pattern being greater than the P1-P3 side lobes of the main beam over an angular sector of about 60° centered on the main beam can insure reception of P2 pulses at much greater ranges than P3 pulses contained in the main beam side lobes can be reliably received. Using P2 timing, interlaced Mode A and Mode C reply messages contained in a main beam burst reply sequence are separated into two "families" of TOAs, the Mode C (altitude) TOAS always being longer than the Mode A TOAs by 13 µsec. A " true" TOA is obtained by subtracting an appropriate time period from the TOA of each family, from which identity, altitude and range information is readily derived. The system continuously adapts to the best instantaneously available timing pulses, alternating between P3 timing and P2 timing throughout the time it takes for a main beam rotation of the received SSRs, thereby extending the operation area of multiple TOA measurements from multiple SSRs which, in turn, provides added safety and reduced false alarms compared to prior passive collision avoidance systems.

La distance à laquelle un système anticollision d'une propre station peut recevoir des interrogations SSR et des messages de réponse d'autres stations peut être allongée en utilisant des impulsions P2 pour synchroniser les mesures TOA en cas de non disponibilité des paires d'impulsions P1-P3 du faisceau principal de balayage ou de ses lobes secondaires. L'amplitude des impulsions P2 dans le diagramme de rayonnement SLS, qui est supérieure à celle des lobes secondaires P1-P3 du faisceau principal sur un secteur angulaire d'environ 60.degrés. centré sur le faisceau principal, permet la réception d'impulsions P2 à des distances supérieures aux distances de réception fiable des impulsions P3 des lobes secondaires du faisceau principal. € l'aide de la synchronisation P2, les messages de réponse entrelacés en mode A ou en mode C, contenus dans les séquences de réponse en salves de faisceau principal, sont divisés en deux «familles» de TOA, les TOA en mode C (altitude) étant plus longs que les TOA en mode A de 13µsec. Un TOA «réel» est obtenu en soustrayant une durée appropriée du TOA de chaque famille, lequel permet de dériver aisément les données d'identité, d'altitude et de portée. Le système s'adapte continuellement en fonction des meilleures impulsions de synchronisation disponibles, en alternance entre les impulsions P3 et P2 pendant la durée de rotation du faisceau principal des SSR reçus, ce qui permet d'étendre la zone d'opération de mesures TOA multiples de SSR multiples, et donc de réduire les fausses alertes par rapport aux systèmes anticollisions passifs.

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