Detecting and recognizing long duration waveforms

Details Detecting and recognizing long duration waveforms Detecting and recognizing long duration waveforms

2007-09-20

2009-08-04

Gregory, Bernarr E (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Radar ew

Detection of surveilance

C342S013000, C342S089000, C342S090000, C342S165000, C342S173000, C342S175000, C342S195000

Reexamination Certificate

active

07570193

ABSTRACT:
A method and apparatus for processing signal pulses received by a device to identify the presence or absence of a waveform is provided. The waveform may have a long duration and may have a sparse energy distribution. An example of such a waveform is the bin-5 radar waveform. Based on the arrival rate of pulses, filtering of pulses is performed. The pulses that are not filtered out are grouped into bursts and information about the bursts is stored in a burst history. For example, the burst history might store the number of pulses in the burst and an inter-burst interval time. Entries over a certain age may be deleted from the burst history. The burst history is analyzed to determine if the pulses conform to a pattern associated with the waveform. The analysis may be based on various statistics. In an embodiment, only time domain information is analyzed.

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