Collision avoidance system for aircrafts
First Claim
1. A collision avoidance system for aircraft each equipped with an ATC transponder comprising;
- an interrogation station mounted on one aircraft, having secondary surveillance radar function emitting an interrogation signal to be responded to by the ATC transponder of a second aircraft,coarse detection means on said one aircraft for detecting the existence of the second aircraft in proximity to said one aircraft, andoutput control means for altering at least one of output power and transmission period of the interrogation signal so as to effect fine detection of said second aircraft when said coarse detection means delivers a signal representing information concerning said second aircraft which exceeds a certain value.
0 Assignments
0 Petitions
Accused Products
Abstract
A collision avoidance system for aircraft in which one aircraft is equippedith an interrogation station having a secondary surveillance radar. Coarse distance measurement is effected either by passive or active distance measurement or by both of them. If the detected distance lies within a certain limit, the output power and/or period of the interrogation signal of the secondary surveillance radar of the subject aircraft is altered so as to effect fine distance measurement. This system can be applied without increasing interference against the existing secondary surveillance radar system by keeping the output power and period of interrogation signal in a minimum required extent. By the same reason the system can keep the interference at a small extent between proximate aircraft, each mounting this collision avoidance system.
23 Citations
11 Claims
-
1. A collision avoidance system for aircraft each equipped with an ATC transponder comprising;
-
an interrogation station mounted on one aircraft, having secondary surveillance radar function emitting an interrogation signal to be responded to by the ATC transponder of a second aircraft, coarse detection means on said one aircraft for detecting the existence of the second aircraft in proximity to said one aircraft, and output control means for altering at least one of output power and transmission period of the interrogation signal so as to effect fine detection of said second aircraft when said coarse detection means delivers a signal representing information concerning said second aircraft which exceeds a certain value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification