b. c. d. e. f. Bombing Equipment, Optical Sight Aerial Mapping Camera Radar Tracking from Ground Station Keeping, Radar Optical Ground Tracking In the radar navigation method, the aircraft radar is used to determine the slant range distance to various targets placed at know locations in the test area. Knowing aircraft altitude, it is possible to calculate rosition using the above slant range data. Tata recording was accomplished by means of radar scope photos. with the optical bomb sight, visual sightings are made on land- v.. marks or targets indicated on a chart and the aircraft position calculated. tae The aerlal mapping camera is activated shortly before time zero anc operates through detonation tice until the film is exhausted. The exact tire of each photographic exsosure was recorded by the oscillograph. If the aircraft flies over terrain having some recognizable features, it would oe possible from scrutiny of the aerial photographs to chart the course of the aircraft as a function of time and determine its locztion at zero time. The slant ranre anc azimuth data from ground based radar track~ ine ecuirpment can ce used to determine aircraft location. This equipment also gives an approximate altituce figure and was used primarily for monitoring purroses to determine that aircraft would not be in a danger rezion at burst time or shock arrival. "Oration keeping” is the rethod whereby an aircraft is posi- tioned ty maintainine a fixed positicn with respect to another airborne zircraft, in tni: instance the "drop" aircraft. The two aircraft fly at constant, thou,hn rossiply different, aititudes. If the difference in &ititude is Known, then the rosition of the test aircraft can be ex- pressed in terms of a cearin: ard slant rance to the "drop" aircraft. The correct cearing and slant ranre is maintained by use of radar. Two-station optical rround trecking can be used to determine aircraft position if altitude is mown. Cperatior derernds unon measuring the azimuth and elevation angles from the try ground stations to the aircraft as a function of tine. Exact loc.tion of ground stations must be -. ,... ¢ ne veel oe me ee o nae ee a ®.. . a oeele oe Known. 2.3.2 Fesronse Measurements Aircraft reaction to clast loadin: was measured in terms of acceleration, shear, torsion, and cCenainr response at various points on the structure. The sensin.: elements or devices used for these measurements in all instarces emrloyed the strain eaze rrincirle, which makes use of the fact that the resista:ce of a wire varies in direct proportion a : are made of esrecially comrounded wire thet can te either pdor.sed to a >. to its elongation within the elastic limits of the wire. Strain gages part of a structure or stretcne: cetween two objects that move relative to each other. Tne former apriicaticn is senerally used when measuring tne strain in a structural remcer, tne latter apriication, the unbonded strain cave, te, as a is cenerally emrloyed in .cesific sernsinre devices such as a <a