Signal sorting device

• US 3,922,676 A
• Filed: 11/12/1964
• Issued: 11/25/1975
• Est. Priority Date: 11/12/1964
• Status: Expired due to Term

• Current Assignee: Eugene R. Fox, Kenneth L. Plante, William A O'Berry
• Original Assignee: Eugene R. Fox, Kenneth L. Plante, William A O'Berry
• Inventors: O'Berry, William A., Fox, Eugene R., Plante, Kenneth L.
• Primary Examiner(s): Wilbur, Maynard R.
• Assistant Examiner(s): Montone, G. E.
• Application Number:
  US04/410,816
• Time in Patent Office: 4,030 Days
• Field of Search: 343/5,10,11,5W,5R,16R,113R,113PT,17.1R,17.1PF,11R,5CM,18E
• US Class Current: 342/13
• CPC Class Codes: G01S 7/021 Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals

Abstract

1. Radar signal processing equipment for indicating the presence of a radiating source having predetermined characteristics, comprising: A DIRECTIONAL ANTENNA ARRAY PROVIDING A PLURALITY OF OUTPUTS, EACH OUTPUT CORRESPONDING, WITHIN A GIVEN RESOLUTION, TO A PARTICULAR ANGULAR SEGMENT OF THE SPACE SCANNED BY THE ANTENNA ARRAY; A PLURALITY OF PROCESSING CHANNELS WHEREIN EACH OF THE PROCESSING CHANNELS IS CONNECTED TO ONE OF THE OUTPUTS FROM THE ANTENNA ARRAY; MEANS IN EACH PROCESSING CHANNEL TO PASS RADAR SIGNALS OF ONLY A PARTICULAR CARRIER FREQUENCY; PULSE WIDTH DETECTOR MEANS TO PASS DEMODULATED PULSE RADAR SIGNALS HAVING LESS THAN A PREDETERMINED PULSE WIDTH; MEANS CONNECTED TO THE PULSE WIDTH DETECTOR TO PASS SIGNALS HAVING ONLY THE PROPER REPETITION FREQUENCY; AND DWELL TIME DETECTOR MEANS RESPONSIVE TO A SUCCESSION OF PULSES APPEARING DURING A PREDETERMINED INTERVAL, AND TO AN ABSENCE OF PULSES DURING A SECOND PREDETERMINED INTERVAL, TO INDICATE THE EXISTENCE OF A SIGNAL SOURCE HAVING DESIRED CHARACTERISTICS.

Claims

1. Radar signal processing equipment for indicating the presence of a radiating source having predetermined characteristics, comprising:

a directional antenna array providing a plurality of outputs, each output corresponding, within a given resolution, to a particular angular segment of the space scanned by the antenna array;

a plurality of processing channels wherein each of the processing channels is connected to one of the outputs from the antenna array;

means in each processing channel to pass radar signals of only a particular carrier frequency;

pulse width detector means to pass demodulated pulse radar signals having less than a predetermined pulse width;

means connected to the pulse width detector to pass signals having only the proper repetition frequency; and

dwell time detector means responsive to a succession of pulses appearing during a predetermined interval, and to an absence of pulses during a second predetermined interval, to indicate the existence of a signal source having desired characteristics.

2. The system of claim 1 wherein the carrier frequency filtering devices each comprise:

means connected to each of the outputs of the directive antenna array to extract a portion of the pulse signal information and carrier signals appearing thereat, a variable band pass filter arrangement connected to all of said extracting means to block signals having undesired carrier frequencies, demodulating means connected to the variable filter to present the pulse signal information modulting the desired carrier frequency, and detector means in each channel connected to the output of the directional antenna array to present the pulse signal information modulating any carrier wave present at the input of the associated channel, coincidence means in each channel, one input thereof connected to the detector means in its respective channel, and the other input thereof connected to the detector means fed by the variable filter, whereby, upon coincidence of pulse information, at the desired frequency as determined by the variable filter, and a modulated signal of that frequency in any particular channel a signal will be provided by the appropriate coincidence means.