GB1111108A - Improvement in or relating to radar system - Google Patents

Abstract

1,111,108. Radar. TESLA NARODNI PODNIK. 15 March, 1966 [15 March, 1965], No. 11295/66. Heading HAD. The Specification describes an aircraft approach radar system, comprising at the intersection of two runways DL and DP, Fig. 1 (not shown), a transmitter V, Fig. 2a, receiver E, a local indicator AD (not shown), and aerials L and P directed along the respective runways. A first remote indicator DS, forms part of an air-traffic control system, a second remote indication TS forms part of a monitoring service, and control units ADO, DSO and TSO, Fig. 2b, are provided for the respective indicators, the control means having precedence of operation in the order DSO, TSO and ADO. Thus on approach of an aircraft, the airtraffic controller depresses normally open switch D1T, thus energizing relay D1 which is then looked on by the closure of contact dl. Contact d1a is also closed such that relay P2 is energized and contact p21 switched over. This causes the energizing of relay P3 and the closure of contact p3. When the power supply ZJ is initially switched on, the receiver E is fully energized, but only the low voltage parts of the transmitter V are energized, i.e. not the magnetron. The magnetron is energized by a connection ZJ2a, ZJ2b, interrupted by contact p3. Thus closure of switch D1T, causes the full energization of the transmitter. The relays &c. may be returned to their initial states and the transmitter magnetron switched off by operation of normally closed switch D2T which deenergizes relay D1. The control unit TSO of the monotor unit is the same as that described for the air-traffic control unit DSO, and works in parallel therewith. The local control unit ADO is also the same as unit DSO, but is connected to one contact of switch p21, such that if either of the switches D1T, T1T are in use (switch p21 to the left), operation of switch A2T does not switch off the transmitter magnetron. Control units DSO, TSO, ADO also contain means whereby half or full power may be fed from the transmitter to the aerials. Thus in Fig. 2c, closure of switch DS1, after energization of relay P2 has switched over contact p22, causes the energization of relay PS. Contact p5 is thus switched over, such that the transmitter power on leads ZJla is only applied to half the power transformer VN primary, and the output power fed to the aerials is doubled. The arrangement for monitoring unit TSO is similar except that switch TS1 is selfresetting and has to be kept depressed. Switch AS1 of the local unit is connected to the upper contact of switch p22 such that it has no effect if relay P2 is energized. The duplexer PA may be shifted by the control units such that the transmitter output is fed to aerial L on to aerial P. Thus, Fig. 2d, shifting switch DS11 to position D11a energizes relay P7, thus closing contact p7 and causing the motor SM to move the duplexer such that the transmitter power is fed to aerial L. Similarly with switch DS11 in position D11c contact p6 is closed and the duplexer is moved to energize aerial P. Similar self-resetting push switches TS2, TS3, AS2, AS3, in the units TSO and ADO are able to perform the same function, when switch DS11 is in the control position DS11b.