Oboe (navigation)

An illustration of Oboe. Two radar stations track the flight of the aircraft. The southern station is the Cat which generates pulses whose arc is defined by the distance from the station to the target. The aircraft will fly along the arc from a start point ten minutes flight from the target. As it approaches the intersect with the arc from the Mouse station the aircraft is signaled to prepare for bomb release. When the aircraft reaches the point where the two arcs intersect the Mouse station transmits the signal to release bombs.

Oboe was a British bomb aiming system developed to allow their aircraft to bomb targets accurately in any type of weather, day or night. Oboe coupled radar tracking with radio transponder technology.[1] The guidance system used two well-separated radar stations to track the aircraft. Two circles were created before the mission, one around each station, such that they intersected at the bomb drop point. The operators used the radars, aided by transponders on the aircraft, to guide the bomber along one of the two circles and drop the bombs when they reached the intersection.

The system was developed in 1942 by the Telecommunications Research Establishment at Malvern in Worcestershire, working in close association with 109 Squadron.[2] By December 1942 a working system had been developed. The first major use of Oboe was in March 1943 when the system was used to mark the Krupp Works in an attack against Essen. Over the course of the month the system was used with great success to mark targets for the Main Force against the German industrial center of the Ruhr and for attacks against Cologne. Through November 1943 Oboe was used with good success against targets within its 250 mile range.

In December 1943 Bomber Command entered what was hoped to be a war winning campaign with the Battle of Berlin. Berlin was over the horizon for even the highest flying RAF aircraft, and thus beyond the range of Oboe. The campaign had to depend upon straight navigation and H2S. Bomber Command's efforts against Berlin over the next four months were unsuccessful. At the end of March Bomber Command was directed to serve under SHAEF to make preparations for the invasion of occupied Europe. These missions to northern France allowed Oboe to again demonstrate its value in the precision delivery of markers or bombs, regardless of weather or the visibility of the target.

Neither H2S nor Gee-H could provide the accuracy of Oboe. By guidance direction of individual aircraft, Oboe was used both to guide marker aircraft for the Main Force and for bombing aircraft making precision bombings of high value targets. It was by far the most accurate bombing system used during the war.[3][4]

  1. ^ Jones, F. E. (1946). "Oboe: A precision ground-controlled blind-bombing system". Journal of the Institution of Electrical Engineers - Part IIIA: Radiolocation. 93 (2): 496–511. doi:10.1049/ji-3a-1.1946.0133.
  2. ^ Cassidy, Alfred (May 2000). "Oboe: Top Secret Radar, WW II" (PDF). Archived from the original (PDF) on 16 November 2017. Retrieved 10 December 2018.
  3. ^ Cumming 1998, p. 164.
  4. ^ Jones 2017, p. 276.