Sequenced spatial coordinate determining system

Claim 1

AN ELECTRONIC SYSTEM FOR PRODUCING LOCATION INFORMATION OF A TRANSPONDER-CARRYING OBJECT, SAID TRANSPONDER BEING RESPONSIVE TO A GROUND-TRANSMITTED SIGNAL FOR RETRANSMITTING SAID SIGNAL, SAID SYSTEM COMPRISING: AT LEAST A PAIR OF TRANSMITTER-RECEIVER UNITS, EACH OF SAID UNITS BEING OPERABLE WHEN ACTUATED FOR TRANSMITTING AND RECEIVING SIGNALS FROM THE TRANSPONDER IN SAID OBJECT FOR DETERMINING RESPECTIVE SLANT RANGES THERETO; A PAIR OF CIRCUIT MEANS COUPLED TO SAID PAIR OF TRANSMITTER-RECEIVER UNITS, RESPECTIVELY, EACH OF SAID CIRCUIT MEANS INCLUDING FIRST AND SECOND ACTUABLE MEANS, SAID FIRST ACTUABLE MEANS BEING RESPONSIVE WHEN ACTUATED FOR INDEPENDENTLY ACTUATING ITS ASSOCIATED TRANSMITTER-RECEIVER UNIT, AND SAID SECOND ACTUABLE MEANS BEING RESPONSIVE WHEN ACTUATED FOR CAUSING ITS ASSOCIATED TRANSMITTER-RECEIVER UNIT TO BE ACTUATED BY A TRANSPONDER-RETRANSMITTED SIGNAL FROM THE OTHER OF SAID PAIRED TRANSMITTER-RECEIVER UNITS.