×

Dual burst, wide range sonar system

  • US 4,396,268 A
  • Filed: 08/26/1981
  • Issued: 08/02/1983
  • Est. Priority Date: 08/26/1981
  • Status: Expired due to Term
First Claim
Patent Images

1. A sonic rangefinder system comprising transmitting and receiving means for transmitting a burst of sonic energy toward a subject and for receiving an echo therefrom so as to produce a range signal representative of subject distance in accordance with the elapsed time between transmission and reception, said transmitting means including a receiver and blanking means for blanking said receiver in synchronism with transmission of a burst for a blanking period in accordance with at least the duration of said burst, said tramsmitting and receiving means including means for automatically transmitting at least a pair of spaced apart bursts of sonic energy with one of said bursts being a short burst and the other thereof being a long burst, and said blanking means including means for blanking said receiver for a relatively short blanking period during the duration of said short burst and for a relatively long blanking period during the duration of said long burst so that said long burst is applicable to distant subjects whose echo return time is greater than said short blanking period while said short burst is applicable to determine near subject distances, including those whose echo return time is greater than said short blanking period but less than said long blanking period.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×