초록 ▼

A collision avoidance system using on-board B-CAS equipment having an object to minimize interference with the ground SSR stations and to effect precise tracking or distance-altitude measurement when necessary. Normally passive surveillance is made to detect the presence of other aircraft in the B-C

A collision avoidance system using on-board B-CAS equipment having an object to minimize interference with the ground SSR stations and to effect precise tracking or distance-altitude measurement when necessary. Normally passive surveillance is made to detect the presence of other aircraft in the B-CAS range. Active surveillance is added when required. In the active surveillance mode, initiated on locating an intruder aircraft, the power and interrogation signal are varied when the intruder aircraft becomes a threat aircraft to minimize interference with the ground SSR stations and aircraft outside the threat zone while maintaining accuracy of detection and tracking of the threat aircraft at a high level.

대표청구항 ▼

A surveillance system for avoiding collision between aircraft using radar beacons and comprising a surveillance means for other aricraft, a surveillance means for intruder aircraft, a surveillance means for threat aircraft, wherein said surveillance means for other aircraft comprises the following t

A surveillance system for avoiding collision between aircraft using radar beacons and comprising a surveillance means for other aricraft, a surveillance means for intruder aircraft, a surveillance means for threat aircraft, wherein said surveillance means for other aircraft comprises the following three listening means (a), (b) and (c); (a) a term listen-in means to detect a term from a time of receipt by one aircraft of an interrogation signal emitted from a ground secondary surveillance radar station to a time of receipt by said one aircraft of a response signal sent from an other aircraft responding to said interrogation signal, and to judge whether said detected term is within a predetermined term or not, (b) a level listen-in means to judge whether the receiving level of said response signal from said other aircraft received by said one aircraft exceeds a predetermined level or not, (c) an active listening means comprising a secondary surveillance radar in said one aircraft for irradiating interrogation signals of comparatively low power at predetermined time interval for detecting the presence of a response signal from aircraft; said surveillance means for intruder aircraft comprising a means effecting at least two judgments, a first of which is to intermittently irradiate interrogation signals having at least two interrogation groups having a predetermined interval at a power higher than that of said active listening means, to receive a response signal from responding aircraft and to judge whether the time elapsed between sending said interrogation signal to receipt of the response signal is within a predetermined time limit or not, the second judgment being whether a rate of shortening of said time is greater than a predetermined rate or not; said surveillance means for threat aircraft comprising a means for effecting at least three judgments, a first of which entails intermittently irradiating interrogation signals having at least three interrogation groups having a predetermined interval at a power higher than that of said active listening means, said predetermined interval being shorter than that of said surveillance means for intruder aircraft, response signals from aircraft responding to the interrogation signals being judged as to whether a time from the interrogation to the reception of the response is within a predetermined time or not, a second judgment being whether the shortening rate of said time is longer than a predetermined rate or not, the third judgment involving calculating the estimated time before collision between one\s and other aircraft and to judge whether such calculated time is shorter than a predetermined value or not; and means to judge conditions of at least one of said listening means (a), (b) and/or (c), to judge conditions of at least one of said two judgments for intruder aircraft surveillance and to judge conditions of at least one of said three judgments for threat aircraft surveillance, and based on said judgments and whether an aircraft intrusion or threat condition exists, to effect transfer from the surveillance means for other aircraft to the surveillance means for intruder aircraft and from the surveillance means for intruder aircraft to the surveillance means for threat aircraft and conversely from the surveillance means for threat aircraft to the surveillance means for intruder aircraft and from the surveillance means for intruder aircraft to the surveillance means for other aircraft.