Resources Contact Us Home
Frequency interrupt continuous transmit active sonar transmission and signal processing technique

Image Number 10 for United States Patent #5150335.

In a time continuous transmit active sonar system the frequency of the transmitted waveform is interrupted at predetermined intervals so that a frequency discontinuity in the transmitted waveform occurs at each interruption. The starting and ending frequencies at the beginning and end of the interruptions provide indications for properly resolving the range/Doppler ambiguity that is inherent in prior continuous transmit sonar systems. The transmitted signal may be frequency modulated. Further, the frequency of the transmitted waveform may be rapidly changed and/or multiple frequency waveforms may be transmitted within the same time interval. An existing passive sonar detection system may be modified to include an active continuous transmit sonar system whose echo returns may be processed by the passive system, thereby achieving benefits over conventional active pulsed sonar systems.

  Recently Added Patents
Electronic multiparty accounts receivable and accounts payable system
Systems and methods for automated institutional processing of payments
System and method for data reconfiguration in an optical communication network
Redundant power delivery
Method for producing semiconductor substrate, semiconductor substrate, method for manufacturing electronic device, and reaction apparatus
  Randomly Featured Patents
Methods and apparatus for packaging electronic components
Voltage converter, backlight module control system and control method thereof
Dipstick wipe-off tool
Memory card adapter
Lower-unit for marine outboard drive
Dispenser outlet
Fabrication method of a semiconductor device having a planarized surface
Still picture transmission apparatus
Method and a device for reducing NO.sub.x emissions from a diesel engine