Guidance system

Claim 1

RETURN ECHO SIGNAL TYPE DETECTING APPARATUS FOR A CRAFT, COMPRISING: MEANS FOR ESTABLISHING AT LEAST TWO DISTINCT SENSING REGIONS EACH DEFINED BY A DIFFERENT RADIATION PATTERN, ONE OF SAID SENSING REGIONS BEING A HIGH ENERGY REGION EXTENDING OUTWARDLY FROM SAID CRAFT ALONG A LINE GENERALLY CONCURRENT WITH A PATH OF TRAVEL OF SAID CRAFT AND HAVING A RELATIVELY HIGH DEGREE OF SENSING SENSITIVITY AND THE OTHER OF SAID SENSING REGIONS BEING A LOW ENERGY REGION EXTENDING ALONG LINES GENERALLY TRANSVERSE TO SAID PATH OF TRAVEL AND HAVING A RELATIVELY LOW DEGREE OF SENSING SENSITIVITY APPRECIABLY LESS THAN THAT OF SAID ONE SENSING REGION; A SINGLE SOURCE OF RADIATION ENERGY FOR PRODUCING SAID DIFFERENT RADIATION PATTERNS; SAID SENSING REGION ESTABLISHING MEANS COMPRISING SEPARATE ANTENNAS FOR EACH OF SAID SENSING REGIONS; THE RADIATION PATTERN PRODUCING MEANS ESTABLISHING THE SENSING REGION GENERALLY CONCURRENT WITH SAID PATH OF TRAVEL BEING CONNECTED TO SAID RADIATION SOURCE WITH RELATIVELY HIGH ENERGY TRANSFER MEANS, AND THE RADIATION PATTERN PRODUCING MEANS ESTABLISHING THE OTHER SENSING REGION BEING CONNECTED TO SAID RADIATION SOURCE THROUGH RELATIVE LOW ENERGY TRANSFER MEANS THEREBY TO ESTABLISH A GENERALLY TRANSVERSE SENSING REGION HAVING AN APPRECIABLY LESSER RANGE THAN THAT OF SAID ONE SENSING REGION, AND TIMED GATING MEANS CONNECTED TO ESTABLISH A DISTANCE RANGE OF RESPONSE ASSOCIATED WITH SAID ONE SENSING REGION THAT IS SUBSTANTIALLY GREATER THAN, AND SUBSTANTIALLY FREE OF DISTANCE RANGE OVERLAP WITH, THE DISTANCE RANGE RESPONSE ASSOCIATED WITH SAID OTHER SENSING REGION.