Patent GB-1084528-A (GB)
Title: An air-traffic control display system
IPC: G01S1/02
Filed: 1964-12-16
Abstract: 1,084,528. Radar air traffic control. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. Dec. 16, 1964 [Dec. 18, 1963], No. 51164/64. Heading H4D. [Also in Division G4] In a radar air traffic control system, wherein the control officer is provided with a P.P.I., C.R.T. display B1, using synthetic position information, provided by a computer ER on the bases of available flight plan reports, position reports and identifications, the control officer is alleviated of the task of checking the synthetic information, by the provision of a second P.P.I., C.R.T. display B2, displaying the synthetic position information together with the output of a primary radar system Rp, whereby a correcting officer can, by means of manual adjusting means H, change the synthetic position information of each aircraft in turn, until the synthetic and the real responses on display B2 coincide. The synthetic position information is stored before use in store S p , each aircraft being allocated a particular position in the store. The store may be divided into section I serving display B2, and storing only the position coordinates of the aircraft and signals determining the symbol to be displayed, and section II serving display B1, and storing everything in section I together with additional information identifying the aircraft. The information in each section is read out in cyclic sequence, so that each aircraft is displayed in cyclic order on the two displays, the synthetic display in display B2 being preferably added to the radar display by interscan techniques. Each synthetic aircraft response is presented in turn for correction by the correction officer by the depression of a key on keyboard T, the particular response due for correction being indicated to the officer by its flashing, and its stored position information being moved out of its normal position into position MZ. The manual adjusting means H comprises a rolling ball signal generator RK actuated by the correcting officer, and which feeds signals via register KR, to display B2, where they correct the position signals of the response being corrected. The generator signals also pass to computer ER such that the store position information is corrected, and the control officer is presented with a corrected display. The next time the key is pressed the corrected position information is returned from register KR to its normal position in store S p , and the next position information to be corrected is transferred to position MZ. Alternatively the presentation of the synthetic position information may be automatic, one response following another in cyclic order, and with the correcting officer provided with a key to stop the cycle when particular attention must be given to a particular response. When a new response appears on the radar display B2, the aircraft responsible is identified by interrogating it with a secondary radar Rs, the identity being displayed on indicating panel A and fed by the correcting officer to the computer ER. The screen of the C.R.T. of display B2 may be divided for convenience into nine portions F1 . . . F9, and the positions in the store divided into nine corresponding portions ZG1 . . . ZG9. If a particular response or responses is to be given repeated checking outside of the normal cycle, the corresponding stored information may be moved to special positions SZ in the store. The keyboard may contain additional keys, controlling various functions.