HARMONIC DETECTION SYSTEM

• US 3,631,484 A
• Filed: 07/30/1969
• Issued: 12/28/1971
• Est. Priority Date: 07/30/1969
• Status: Expired due to Term

• Current Assignee: Harry A. Augenblick
• Original Assignee: Harry A. Augenblick
• Inventors: Augenblick, Harry A.
• Application Number:
  US04/845,955
• Time in Patent Office: 881 Days
• US Class Current: 342/46
• CPC Class Codes: G01S 13/58 Velocity or trajectory determination systems; Sense-of-movement determination systems
• CPC Class Codes: G01S 13/753 using frequency selective elements, e.g. resonator

Abstract

A detection system comprising a transmitter for radiating signal of frequency '"'"''"'"''"'"''"'"'F'"'"''"'"''"'"''"'"' to a harmonic generator. The generator is adapted to produce a signal of frequency '"'"''"'"''"'"''"'"' XF+ XD'"'"''"'"''"'"''"'"' where XF is a harmonic of the transmitted signal and XD is a frequency shift due to the movement of the generator. A receiver includes a multiplier connected to the transmitter for producing a signal XF and a mixer adapted to receive the harmonic generator signal and the multiplier signal for producing a signal proportional to the difference therebetween.

Claims

1. A detection system comprising a transmitter including signalgenerating means for generating a signal having a preselected frequency, and radiating means connected to said signalgenerating means for radiating said signal of preselected frequency, a passive harmonic generator means operable to receive said preselected frequency signal for generating an output signal having a frequency equal to a harmonic greater than said preselected frequency plus a differential proportional to the speed of said harmonic generator means;

and receiving means for detecting the movement of said harmonic generator means;

said receiving means comprising an antenna for receiving said output signal, multiplier means connected to said signal-generating means for producing a signal of frequency equal to said harmonic, and mixing means connected to said antenna and said multiplier means for producing a signal proportional to the difference in frequency between said output and harmonic signals.

2. In a detection system as in claim 1, and frequency-modulating means connected to said signal-generating means to vary the frequency of the signal produced by said signal-generating means about said preselected frequency.

3. In a detection system according to claim 1, in which said harmonic-generating means comprises a diode connected to an antenna.

4. In a detection system as in claim 3, and biasing means to operate said diode at a predetermined point on its characteristic curve to change the impedance thereof.

5. In a detection system as in claim 4, in which said biasing means comprises a source of varying potential to modulate the signals generated by said diode.

6. In a detection system according to claim 1, in which said harmonic-generating means comprises a diode connected between a receiving and transmitting antenna.

7. In a detection and navigation system as in claim 1, and a filter connected to said harmonic-generating means for attenuating all signals except a preselected one of said harmonic signals.

8. In a detection system as in claim 1, and indicating means responsive to said mixing means signal for indicating the movement of said harmonic generator means.

9. In a detection system as in claim 3, and frequency-detecting means responsive to said mixing means signal for producing an indication proportional to the frequency of said mixing means.