Sum-difference direction-finding device

• US 3,221,328 A
• Filed: 11/15/1962
• Issued: 11/30/1965
• Est. Priority Date: 12/01/1961
• Status: Expired due to Term

• Current Assignee: Walter Isch Hans
• Original Assignee: Walter Isch Hans
• Inventors: WALTER ISCH HANS
• Application Number:
  US04/237,843
• Time in Patent Office: 1,111 Days
• US Class Current: 342/151
• CPC Class Codes: G01S 13/44 Monopulse radar, i.e. simultaneous lobing
• CPC Class Codes: G01S 13/4409 HF sub-systems particularly adapted therefor, e.g. circuits for signal combination multi-lobing aerials or aerial systems H01Q25/00
• CPC Class Codes: G01S 13/4427 with means for eliminating the target-dependent errors in angle measurements, e.g. glint, scintillation effects
• CPC Class Codes: G01S 13/4436 with means specially adapted to maintain the same processing characteristics between the monopulse signals
• CPC Class Codes: G01S 7/4021 of receivers
• CPC Class Codes: G01S 7/4052 by simulation of echoes
• CPC Class Codes: G01S 7/4069 involving a RF signal injection

Claims

1. A SUM-DIFFERENCE TYPE MONOPULSE RADAR LOCATING APPARATUS COMPRISING, IN COMBINATION A PLURALITY OF PRIMARY TRANSMITTING AND RECEIVING ANTENNAS;

MEANS FOR SUPPLYING GENERATED RADIO ENERGY TO SAID ANTENNAS AT A PRESELECTED FREQUENCY;

A REFLECTOR SPACED FROM SAID PRIMARY ANTENNAS AND FOCUSING RECEIVED RADIO ENERGY TO SAID PRIMARY ANTENNAS;

A RECEIVED ENERGY COMPARISON NETWORK CONNECTED TO SAID PRIMAY ATENNAS TO PROVIDE A SUM SIGNAL AND TWO DIFFERENCE SIGNALS AT THE OUTLET PORTS OF SAID COMPARISON NETWORI;

AN AUXILIARY ANTENNA MOUNTED WITHIN SAID REFLECTOR AND FACING SAID PRIMARY ANTENNAS;

MEANS FOR SUPPLYING ENERGY TO SAID AUXILIARY ANTENNA AT A FREQUENCY CORRESPONDING TO THE SUPPLY OF GENERATED RADIO ENERGY TO SAID ANTENNAS, FOR SAID AUXILIARY ANTENNA TO RADIATE A CALIBRATING SIGNAL TO ALL OF SAID PRIMARY ANTENNAS;

SAID AUXILIARY ANTENNA BEING SO POSITIONED WITHIN SAID REFLECTOR WITH RESPECT TO SAID PRIMARY ANTENNAS THAT THE ENERGY RADIATED BY SAID AUXILIARY ANTENNA AND RECEIVED BY SID PRIMARY ANTENNAS GENERATES, IN SAID COMPARISON NETWORK, SUMMATION AND DIFFERENCE SIGNALS WHICH ARE OF SUBSTANTIALLY EQUAL PHASE AT THE OUTLET PORTS OF SAID COMPARISON NETWORK.