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- Q1760015 subject Q18580101.
- Q1760015 subject Q6431895.
- Q1760015 subject Q8953208.
- Q1760015 abstract "Oboe was a British aerial blind bombing targeting system in World War II, based on radio transponder technology. Using triangulation to determine relative location, the system consisted of a pair of radio transmitters on the ground, which sent signals which were received and retransmitted by a transponder in the aircraftt (typically a De Havilland Mosquito or Avro Lancaster). By comparing the time each signal took to reach the aircraft, its location could be calculated to a fair degree. In this way, an aircraft could be directed blindly over a specific target, all of which were pre-calculated and kept on file. Prior to a mission, a circle was drawn around the primary Oboe transmitter so that it passed over the selected target, with the primary transmitter in the exact center, and the radius of the circle noted. The transponder equipped bomber (or bombers, one at a time) would then attempt to fly along the circumference of this circle towards the target. By keeping careful track of the range between the transponder and transmitter, the Oboe operator in England would use the equipment to see if the bomber strayed from the path of the circle, and give the pilot instructions on how to regain it. While the primary transmitter could tell that the aircraft was on the circle, it was impossible to tell at what point it was. For this, the range from the secondary transmitter was also measured, and a circle drawn around it; the bomber would be at the point where the two circles intersected. By repeatedly doing this, the progress of the bomber could be tracked, and when it reached the point where the primary line passed over the target, a coded signal was sent alerting the crew to drop their bombs (they would typically also be alerted to waypoints and when the target was near) The path was only 35 yards (32 m) wide, allowing for much greater accuracy than other systems like Gee. The curved path of the aircraft was quite evident to German radar operators, who came to call the system "Boomerang" after the arc segment left on their displays as the aircraft appeared and disappeared out of range.The system was first used in December 1941, about the same time as H2S radar was introduced and a few months after the first use of Gee. As it could only guide one aircraft at a time, Oboe was used to direct the pathfinder bombers to drop their target indicators for the initial stages of the raid; following bombers would use the markers as a reference for conventional bombsights. Individual aircraft were also used to bomb point targets. Gee, a passive system that could be used by an unlimited number of aircraft, remained in use for local guidance over the UK, even after Oboe became widely used for bombing.Oboe's limitation of one aircraft at a time led to several new systems. Among these were the Gee-H system, which used the existing Gee equipment with Oboe-like transmitters. Gee-H could guide about 80 aircraft at once. In the U.S., SHORAN was similar, with a limitation of about 20 aircraft.".
- Q1760015 wikiPageExternalLink index.html.
- Q1760015 wikiPageExternalLink m3.
- Q1760015 wikiPageExternalLink chapter13.pdf.
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- Q1760015 comment "Oboe was a British aerial blind bombing targeting system in World War II, based on radio transponder technology. Using triangulation to determine relative location, the system consisted of a pair of radio transmitters on the ground, which sent signals which were received and retransmitted by a transponder in the aircraftt (typically a De Havilland Mosquito or Avro Lancaster). By comparing the time each signal took to reach the aircraft, its location could be calculated to a fair degree.".
- Q1760015 label "Oboe (navigation)".