Communications: directive radio wave systems and devices (e.g. – Transmission through media other than air or free space
Patent
1987-03-27
1989-03-14
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Transmission through media other than air or free space
342459, 324329, 324337, G01S 744, G01S 1306, G01V 312
Patent
active
048128503
ABSTRACT:
A method and apparatus for producing data indicative of the presence of buried objects, wherein two waveforms I(t) Q(t) are combined with two reference waveforms Ir(t) Qr(t) using filters 10, 12, 14, 16 of two types A, B. Type A has time response Ir(-t) and type B has time response Qr(-t). The products {I(t)@Ir(t)}.multidot.{Q(t)@Qr(t)} and {I(t)@Qr(t)}.multidot.{Q(t)@Ir(t)} from multipliers 18, 20 are subtracted to give V1 and added to give V2 in the combiner 30. A list of object distances (36) is derived from V1. A list of object orientations (46) is derived from V2. Object times (34) are used to section V2 at (40) on a time basis. A correlation operation is represented by @. The invention is particularly applicable to location of buried pipes using ground probing radar, but is also useful in locating planar objects and in other systems. The waveform combination suppresses noise and clutter. I(t) and Ir(t) are quadrature versions of Q(t) and Qr(t). The emitted radiation is circularly polarized.
REFERENCES:
patent: 3775765 (1973-11-01), Di Piazza et al.
patent: 4292635 (1981-09-01), Rittenback
Robinson et al., Location and Recognition of Discontinuities in Dielectric Media Using Synthetic RF Pulses, Procl. IEEE, vol. 62, No. 1, Jan. 1974, pp. 36-44.
Gunton David J.
Manning Lucy J.
Barron Jr. Gilberto
British Gas plc
Tarcza Thomas H.
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