Radiolocation systems

• US 3,242,492 A
• Filed: 12/03/1962
• Issued: 03/22/1966
• Est. Priority Date: 12/09/1961
• Status: Expired due to Term

• Current Assignee: Gabriel Torcheux Emile Leon, Henry Honore Etienne Augustin
• Original Assignee: Gabriel Torcheux Emile Leon, Henry Honore Etienne Augustin
• Inventors: HENRY HONORE ETIENNE AUGUSTIN, GABRIEL TORCHEUX EMILE LEON
• Application Number:
  US04/241,780
• Time in Patent Office: 1,205 Days
• US Class Current: 342/393
• CPC Class Codes: G01S 1/20 using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems
• CPC Class Codes: G01S 1/30 the synchronised signals being continuous waves or intermittent trains of continuous waves, the intermittency not being for the purpose of determining direction or position line and the transit times being compared by measuring the phase difference
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location

Claims

1. A RADIO LOCATION SYSTEM OF THE TYPE, COMPRISING:

A PLURALITY OF TRANSMITTERS INCLUDING A MAIN TRANSMITTER AND AUXILIARY TRANSMITTERS LOCATED AT KNOWN POINTS AND EACH HAVING TRANSMITTER MEANS RADIATING IN TURN PULSES AT DIFFERENT FREQUENCIES IN ACCORDANCE WITH A CYCLE;

RECEIVER MEANS AT A RECEIVER STATION OPERABLE TO DETECT THE PHASE RELATIONSHIP BETWEEN THE WAVES RADIATED FROM SAID TRANSMITTER MEANS TO ASCERTAIN THE POSITION OF THE RECEIVER STATION;

EACH TRANSMITTER AND RECEIVER MEANS INCLUDING;

PRIMARY CLOCK MEANS, FIRST MEANS OPERATIVELY CONNECTED WITH SAID PRIMARY CLOCK MEANS FOR OPERATING ALL OF SAID PRIMARY CLOCK MEANS IN SUBSTANTIALLY PERFECT SYNCHRONISM, AND SECOND MEANS AT EACH TRANSMITTER MEANS FOR CONTROLLING THE TRANSMISSION OF WAVES BY THE RESPECTIVE PRIMARY CLOCK MEANS, SECONDARY CLOCK MEANS AT EACH AUXILIARY TRANSMITTER AND EACH RECEIVER MEANS, EACH TRANSMITTER STATION HAVING ONE SECONDARY CLOCK MEANS AND THE NUMBER OF SECONDARY CLOCK MEANS AT A RESPECTIVE RECEIVER MEANS CORRESPONDING TO THE NUMBER OF TRANSMITTER STATIONS, THIRD MEANS AT EACH AUXILIARY TRANSMITTER OPERATIVELY CONNECTED WITH A RESPECTIVE SECONDARY CLOCK MEANS FOR OPERATING THE SECONDARY CLOCK MEANS IN RELATIVE SYNCHRONISM WITH THE PRIMARY CLOCK MEANS OF THE MAIN TRANSMITTER, FOURTH MEANS IN EACH RECEIVER MEANS OPERATIVELY CONNECTED WITH THE SECONDARY CLOCK MEANS THEREOF FOR OPERATING A RESPECTIVE SECONDARY CLOCK MEANS THEREOF IN RELATIVE SYNCHRONISM WITH THE PRIMARY CLOCK MEANS OF A CORRESPONDING TRANSMITTER MEANS;

AND OUTPUT MEANS IN A RESPECTIVE RECEIVER MEANS OPERATIVELY CONNECTED WITH THE SECONDARY CLOCK MEANS THEREOF FOR INDICATING WITH REFERENCE TO A RESPECTIVE TRANSMITTER MEANS THE DIFFERENCES IN TIME EQUAL TO THE TIMES OF TRAVEL OF THE WAVES FROM ONE STATION TO ANOTHER.