Method and device in the antenna and receiving system of a radio theodolite
US5010343A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1989 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | Apr 25, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S11/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and device in the antenna and receiving system of a radio theodolite, wherein the radio signal arriving from the transmitter of the object (31) to be measured is received by means of at least three antennas (1 . . . n-1) in the antenna field (AK) as well as by means of a reference antenna (n). The signals received from said antennas are passed to the receiving system, being controlled and selected by an antenna-selection switch (10a). By means of said system, the phase differences between the signals of different antennas are detected and measured, on the basis of which phase differences it is possible to calculate the angles of incidence (.alpha.,.epsilon.) of the signals on the basis of the known coordinates of location of the antennas in the antenna field (AK). In the method an outer reference antenna (n+1) is used which does not belong to the antenna field (AK) proper. The phases of the antennas (1 . . . n-1) belonging to the antenna field proper and of the inner reference antenna (n) are measured in relation to the reference signal obtained from said outer reference antenna (n+1) and from the receiver (12) connected to same so that no calibration is required between the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.