Method and device in the antenna and receiving system of a radio

Details Method and device in the antenna and receiving system of a radio Method and device in the antenna and receiving system of a radio

1989-04-25

1991-04-23

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

342433, 342442, 342444, G01S 504

Patent

active

050103431

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 measurement branches and the reference branches.

REFERENCES:
patent: 3975736 (1976-08-01), Ewen
patent: 4328499 (1982-05-01), Anderson et al.
patent: 4809012 (1989-02-01), Tong
Rohde & Schwarz GmbH & Co. KG, Direction Finding and Radiolocation, News Special, pp. 78-82 and 90.
George Oeh and Al Lampell, Advanced Techniques Give One-Degree Accuracy in VHF/UHF Direction Finding, MSN: Mar. 1984, pp. 145-157.

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