Determining relative position by means of the transit time of waves

Claim 1

A METHOD OF PROVIDING A MEASURE OF THE DISTANCE BETWEEN TWO SPACED POINTS CONSISTING IN GENERATING AT, AND RADIATING FROM, THE FIRST POINT A FIRST AND SECOND MEASURING FREQUENCY EACH AS A COMPONENT OF AN ELECTROMAGNETIC WAVE; GENERATING AT AND RADIATING FROM THE SECOND POINT A THIRD MEASURING FREQUENCY ALSO AS A COMPONENT OF AN ELECTROMAGNETIC WAVE; AT THE SECOND POINT RECEIVING THE WAVE OR WAVES CONTAINING THE FIRST AND SECOND MEASURING FREQUENCIES DETECTING FROM THE WAVES RECEIVED AND GENERATED AT THE POINT A FIRST COMPARISON FREQUENCY WHICH IS THE DIFFERENCE BETWEEN THE FIRST AND THIRD MEASURING FREQUENCIES, DETECTING FROM THE SAME WAVES A SECOND COMPARISON FREQUENCY WHICH IS THE SECOND MEASURING FREQUENCY OR THE DIFFERENCE FREQUENCY BETWEEN THE SECOND MEASURING FREQUENCY AND THE THIRD MEASURING FREQUENCY, TESTING THE RELATIONSHIP BETWEEN THE FIRST AND SECOND COMPARISON FREQUENCIES, DERIVING A CONTROL SIGNAL FROM THE TESTING OPERATION WHEN THE RELATIONSHIP BETWEEN THE COMPARISON FREQUENCIES DIFFERS FROM THE PREDETERMINED RELATIONSHIP, AND EMPLOYING THE CONTROL SIGNAL SO TO CONTROL THE GENERATION OF THE THIRD MEASURING FREQUENCY THAT THE PREDETERMINED FREQUENCY RELATIONSHIP BETWEEN THE COMPARISON FREQUENCIES IS RESTORED OR ESTABLISHED; AND AT THE FIRST POINT RECEIVING THE WAVE CONTAINING THE THIRD MEASURING FREQUENCY, FROM THE WAVE RECEIVED AND GENERATED AT THE POINT DETECTING THE FIRST AND SECOND COMPARISON FREQUENCIES AND COMPARING THE PHASES OF THE

Claim 2

A METHOD OF PROVIDING A MEASURE OF THE DISTANCE BETWEEN TWO SPACED POINTS CONSISTING IN GENERATING AT, AND RADIATING FROM, THE FIRST POINT A FIRST AND SECOND MEASURING FREQUENCY EACH AS A COMPONENT OF AN ELECTROMAGNETIC WAVE; GENERATING AT AND RADIATING FROM THE SECOND POINT A THIRD MEASURING FREQUENCY ALSO AS A COMPONENT OF AN ELECTROMAGNETIC WAVE; AT THE SECOND POINT RECEIVING THE WAVE OR WAVES CONTAINING THE FIRST AND SECOND MEASURING FREQUENCIES DETECTING FROM THE WAVES RECEIVED AND GENERATED AT THE POINT A FIRST COMPARISON FREQUENCY WHICH IS THE DIFFERENCE BETWEEN THE FIRST AND THIRD MEASURING FREQUENCIES, DETECTING FROM THE SAME WAVES A SECOND COMPARISON FREQUENCY WHICH IS THE SECOND MEASURING FREQUENCY OR THE DIFFERENCE FREQUENCY BETWEEN THE SECOND MEASURING FREQUENCY AND THE THIRD MEASURING FREQUENCY, TESTING THE RELATIONSHIP BETWEEN THE FIRST AND SECOND COMPARISON FREQUENCIES, DERIVING A CONTROL SIGNAL FROM THE TESTING OPERATION WHEN THE RELATIONSHIP BETWEEN THE COMPARISON FREQUENCIES DIFFERS FROM THE PREDETERMINED RELATIONSHIP, AND EMPLOYING THE CONTROL SIGNAL SO TO CONTROL THE GENERATION OF THE THIRD MEASURING FREQUENCY THAT THE PREDETERMINED FREQUENCY RELATIONSHIP BETWEEN THE COMPARISON FREQUENCIES IS RESTORED OR ESTABLISHED; AND AT THE FIRST POINT RECEIVING THE WAVE CONTAINING THE THIRD MEASURING FREQUENCY, FROM THE WAVE RECEIVED AND GENERATED AT THE POINT DETECTING THE FIRST AND SECOND COMPARISON FREQUENCIES AND COMPARING THE PHASES OF THE

Claim 3

A SYSTEM FOR PROVIDING A MEASURE OF THE DISTANCE BETWEEN TWO SPACED POINTS COMPRISING FREE-RUNNING MEANS STO GENERATE AND RADIATE A FIRST AND SECOND MEASURING FREQUENCY AT A FIRST POINT, CONTROLLED MEANS TO GENERATE AND RADIATE A THIRD MEASURING FREQUENCY AT A SECOND POINT; AT THE SECOND POINT MEANS TO RECEIVE THE FIRST AND SECOND MEASURING FREQUENCIES, MEANS FOR DETECTING THE DIFFERENCE FREQUENCY BETWEEN THE FIRST AND THIRD MEASURING FREQUENCIES, MEANS FOR DETECTING THE SECOND MEASURING FREQUENCY, MEANS TO DERIVE A CONTROL SIGNAL FROM THE DIFFERENCE FREQUENCY AND THE SECOND MEASURING FREQUENCY AS DETECTED AT THE SECOND POINT AND MEANS SO TO APPLY THE CONTROL SIGNAL TO THE MEANS FOR GENERATING THE THIRD MEASURING FREQUENCY AS TO KEEP THE DIFFERENCE FREQUENCY EQUAL TO THE SECOND MEASURING FREQUENCY; AND AT THE FIRST POINT MEANS TO RECIEVE THE THIRD MEASURING FREQUENCY, MEANS TO DETECT THE DIFFERENCE FREQUENCY BETWEEN THE FIRST MEASURING FREQUENCY AS GENERATED AND THE THIRD MEASURING FREQUENCY AS RECEIVED, AND MEANS TO COMPARE THE PHASES OF THE LATTER DIFFERENCE FREQUENCY AND THE SECOND MEASURINE FREQUENCY AS GENERATED TO GIVE A MEASURE OF THE DISTANCE BETWEEN THE TWO POINTS.

Claim 4

A SYSTEM FOR PROVIDING A MEASURE OF THE DISTANCE BETWEEN TWO SPACED POINTS COMPRISING FREE-RUNNING MEANS STO GENERATE AND RADIATE A FIRST AND SECOND MEASURING FREQUENCY AT A FIRST POINT, CONTROLLED MEANS TO GENERATE AND RADIATE A THIRD MEASURING FREQUENCY AT A SECOND POINT; AT THE SECOND POINT MEANS TO RECEIVE THE FIRST AND SECOND MEASURING FREQUENCIES, MEANS FOR DETECTING THE DIFFERENCE FREQUENCY BETWEEN THE FIRST AND THIRD MEASURING FREQUENCIES, MEANS FOR DETECTING THE SECOND MEASURING FREQUENCY, MEANS TO DERIVE A CONTROL SIGNAL FROM THE DIFFERENCE FREQUENCY AND THE SECOND MEASURING FREQUENCY AS DETECTED AT THE SECOND POINT AND MEANS SO TO APPLY THE CONTROL SIGNAL TO THE MEANS FOR GENERATING THE THIRD MEASURING FREQUENCY AS TO KEEP THE DIFFERENCE FREQUENCY EQUAL TO THE SECOND MEASURING FREQUENCY; AND AT THE FIRST POINT MEANS TO RECIEVE THE THIRD MEASURING FREQUENCY, MEANS TO DETECT THE DIFFERENCE FREQUENCY BETWEEN THE FIRST MEASURING FREQUENCY AS GENERATED AND THE THIRD MEASURING FREQUENCY AS RECEIVED, AND MEANS TO COMPARE THE PHASES OF THE LATTER DIFFERENCE FREQUENCY AND THE SECOND MEASURINE FREQUENCY AS GENERATED TO GIVE A MEASURE OF THE DISTANCE BETWEEN THE TWO POINTS.