3781880

Information

• Patent Grant
• 3781880

• References
• Source

• Patent Number

  3,781,880

• Date Filed

  Not available

• Date Issued

  Tuesday, December 25, 1973
  51 years ago

• CPC

  • G01S1/38 - using comparison of (1) the phase of the envelope of the change of frequency, due to Doppler effect, of the signal transmitted by an aerial moving, or appearing to move, in a cyclic path with (2) the phase of a reference signal, the frequency of this reference signal being synchronised with that of the cyclic movement, or apparent cyclic movement, of the aerial
  • G01S1/02 - using radio waves

• US Classifications

  • 342 - Communications: directive radio wave systems and devices