Speed measuring apparatus

• US 3,118,139 A
• Filed: 11/25/1959
• Issued: 01/14/1964
• Est. Priority Date: 11/25/1959
• Status: Expired due to Term

• Current Assignee: Gerald Durstewitz
• Original Assignee: Gerald Durstewitz
• Inventors: GERALD DURSTEWITZ
• Application Number:
  US03/855,360
• Time in Patent Office: 1,511 Days
• US Class Current: 356/28
• CPC Class Codes: G01S 13/003 Bistatic radar systems; Multistatic radar systems
• CPC Class Codes: G01S 13/60 wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track G01S13/64 takes precedence
• CPC Class Codes: G01S 13/92 for velocity measurement

Claims

1. SPEED MEASURING APPARATUS MOUNTED ON A BODY MOVING WITH RESPECT TO AN OBJECT FOR DETECTING THE SPEED OF A SECOND MOVING BODY RELATIVE TO THE OBJECT INCLUDING IN COMBINATION MEANS FOR RADIATING ENERGY AT A PREDETERMINED FREQUENCY TOWARD THE SECOND BODY AND TOWARD THE OBJECT AND FOR RECEIVING THE RADIATIONS REFLECTED FROM THE SECOND BODY AND FROM THE OBJECT, MEANS FOR COMPARING SAID RECEIVED RADIATIONS AND PRODUCING A SIGNAL HAVING A FREQUENCY EQUAL TO THE DIFFERENCE BETWEEN THE FREQUENCY OF THE RECEIVED RADIATIONS REFLECTED FROM THE OBJECT AND THE FREQUENCY OF THE RECEIVED RADIATIONS, REFLECTED FROM THE SECOND BODY, AND MEANS RESPONSIVE TO SAID DIFFERENCE FREQUENCY SIGNAL FOR GIVING AN INDICATION OF THE SPEED OF THE SECOND BODY WITH RESPECT TO THE OBJECT.