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
Entropy encoding and decoding using direct level and run-length/level context-adaptive arithmetic coding/decoding modes
Systems and methods for picture based communication
Direct converting apparatus, method for controlling the same, and control signal generation device
Enterprise seamless mobility
RF/optical shared aperture for high availability wideband communication RF/FSO links
Evolutionary clustering algorithm
Testing apparatus and testing method for telephone apparatus
  Randomly Featured Patents
Unidirectional tape
Aluminum electroplating solution
Systems, methods and computer program products for distributing connection information between ATM nodes
Solid state imaging device and method of driving the same
Copolymer of propylene or ethylene oxide and of an oxirane bearing an ionic group
Electrophysiology RF energy treatment device
Dielectric element including oxide-based dielectric film and method of fabricating the same
Side-wall barrier structure and method of fabrication
Trench etch with incremental oxygen flow
Analog pre-processor with improved input common mode range