CPC Subgroup
G01S 3/04 Details
Full Title
Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received (position-fixing by co-ordinating a plurality of determinations of direction or position lines G01S5/00) > using radio waves > Details
6 direct subcodes
Child Classifications
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- G01S 3/06 Means for increasing effective directivity, e.g. by combining signals having differently oriented directivity characteristics or by sharpening the envelope waveform of the signal derived from a rotating or oscillating beam antenna (comparing amplitude of signals having differently oriented directivity characteristics to determine direction G01S3/16, G01S3/28)
- G01S 3/08 Means for reducing polarisation errors, e.g. by use of Adcock or spaced loop antenna systems
- G01S 3/10 Means for reducing or compensating for quadrantal, site, or like errors
- G01S 3/12 Means for determining sense of direction, e.g. by combining signals from directional antenna or goniometer search coil with those from non-directional antenna (determining direction by amplitude comparison of signals derived by combining directional and non-directional signals G01S3/24, G01S3/34)