System for locating a radar transmitter

• US 4,068,237 A
• Filed: 06/29/1976
• Issued: 01/10/1978
• Est. Priority Date: 06/29/1976
• Status: Expired due to Term

• Current Assignee: James R. Jones, Jr.
• Original Assignee: James R. Jones, Jr.
• Inventors: Jones, James R. Jr.
• Primary Examiner(s): Wilbur, Maynard R.
• Assistant Examiner(s): Blum, T. M.
• Application Number:
  US05/700,991
• Time in Patent Office: 560 Days
• Field of Search: 343/112 R, 343/112 C, 343/112 PT, 343/15
• US Class Current: 342/451
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location

Abstract

A system for obtaining the range and bearing of the location of any radar transmission with a minimum of received data (one pulse). Three receiving systems spaced apart from each other receive signals from the radiating source. Solving three simultaneous equations for circles using the location of each receiving antenna as the center of three circles. The point of intersection of the three circles is the location of the radiating source.

Claims

1. A system for detecting the location of an unknown radar transmission the combination including:

a. at least three radar receiving means positioned on a straight line and at a known distance from each other to receive radar transmission from radar transmitters having an unknown location,

b. signal processing circuit means for processing at least one radar pulse signal received by each of said radar receiving means to provide at least three signals representing the respective distances each of said radar receiving means is located from said radar transmitter,

c. a laser beam source,

d. said signal processing circuit means including a reference clock pulse source, a time detection counter coupled to receive said radar pulse signal and to said reference clock source for measuring the time duration following the arrival of a reference clock pulse to the arrival of an incoming radar pulse and providing a digital output signal for modulating the output of said laser beam source,

e. computer means coupled to said signal processing means for computing the location of said radar transmitter.

2. A system for detecting the location of an unknown radar transmission the combination including:

a. at least three radar receiving means positioned on a straight line and at a known distance from each other to receive radar transmission from radar transmitters having an unknown location,

b. signal processing circuit means for processing at least one radar pulse signal received by each of said radar receiving means, said processing circuit including at least one subsystem comprising,

1. a receiver for receiving the received radar pulse signal,

2. a video detector coupled to said receiver for detecting a received radar signal,

3. a reference clock source,

4. time detection counter means coupled to said video detector and to said reference clock source for providing a digital output signal representing a measured time after a radar signal has been detected,

5. a laser beam source,

6. modulator means coupled to said time detection counter and to said laser for providing a modulated laser beam signal,

7. a fiber optics transmission line coupled to said modulator for transmitting said modulated signal in a non-radiating manner,

3. demodulator means coupled to said transmission line for demodulating the transmitted signal to provide digital data suitable for use in a computer.