RU3175U1 - ANTENNA DEVICE - Google Patents

Abstract

An antenna device containing two loop antennas located in orthogonal planes and connected to the inputs of the respective amplifiers, the output of the first amplifier through the first phase shifter, made in the form of a non-minimum phase link, connected to the first input of the first adder, and the output of the second amplifier through the second phase shifter, made in the form of a group of series-connected identical non-minimum phase units, connected to the second input of the first adder, characterized in that it is additionally introduced There is a second adder, the first and second inputs of which are connected respectively to the outputs of the first and second phase shifters, as well as a switch whose output is the output of the antenna device, the first signal input of the switch connected to the output of the first adder, and the second signal input to the output of the second adder .

Description

ANTENNA USTROMST ZO

The utility model relates to radio engineering, in particular to antenna devices for receiving signals from radio navigation systems such as Omega or Laurent-S,

Known receiving antenna system / I /, containing two mutually "orthogonal loop antennas connected to the inputs of the first and second mixers, respectively, the outputs of which are connected to the inputs of the adder, and a local oscillator, the cathode of which through the first frequency divider into two is connected to the mixer of the first orthogonal frame and in parallel, through a phase inverter and a second frequency divider into two, to a mixer of the second frame. Thus, a 90-degree phase shift between the signals in the channels of the receiving antenna system is provided, which allows non-directional in azimuth (circular) pattern of the antenna, which provides the possibility of simultaneous reception of signals of different stations on one frequency.

A known antenna device / 2 /, which is the prototype of the claimed, containing two loop antennas located in orthogonal PLANES. 1I connected to the inputs of the respective amplifiers, the output of the first amplifier through the first phase shifter, made in the form of a non-minimum phase link, connected to the first input of the adder , the output of which is the output of the antenna device, and between the output of the second amplifier and the second input of the adder included a second phase shifter containing several series-connected non-mini low-phase links. Due to the broadband phase shifters, the radiation pattern isotropic in the range of several received frequencies of radar systems.

The prototype device operates as follows.

Orthogonal loop antennas receive radio signals emitted by reference stations of the radio navigation system (for example, Omega, Laurent). The signals received by the loop antennas are fed to the corresponding amplifiers, from the outputs of which they are fed to the inputs of the first and second phase shifters. The first phase shifter, made in the form of a non-minimum phase link, carries out a phase shift of the signals by an amount of the Second phase shifter, which contains several series-connected non-minimum phase links, carries out a phase shift of the signals by the value of BH. . The phase difference of the signals at the outputs of the first and second phase shifters in the operating frequency range is 90 °. The signals from the outputs of the phase shifters are fed to the adder, at the output of which the signal amplitude in the working frequency range does not depend on the direction to the transmitting radio station. Thus, in the working frequency range the device implements a circular radiation pattern

For the prototype device, it is characteristic that the phase of the signal at the output of the adder contains two components: one of them is determined by the phase of the received signal at the output of the antenna, and the other is determined by the azimuth to the transmitting station. In addition, the phase of the signal at the output of the adder depends on the difference in transmission coefficients frame paths, as well as deviations from the orthogonality of the frames. It should be noted that only the first of the indicated phase components of the signals received by the device carries navigation information (information about the distance to station) and is useful “Therefore, in the process of navigation measurements, the phases (phase differences) of the received reference stations should be adjusted taking into account the introduced errors, including the error depending on the directions to the reference transmitting stations. To implement such an algorithmic correction, in particular, during operation in the differential-ranging mode, it is necessary to know the angle between the azimuths to the transmitting stations, which for specific areas may be known in advance, and for operating in the ranging mode, it is necessary to know the azimuth for each Pass the station "that

&

practically, with the required accuracy, is not feasible.

The objective of the utility model is the formation by the antenna device of additional output signals, which would make it possible to mutually compensate phase errors during their joint processing with the main signals in the process of navigation phase measurements, depending both on the non-identity of the transmission coefficients of the frame paths and the deviations of the frames from orthogonality and on the direction to the reference transmitting stations of the radio navigation system.

The solution to this problem allows navigational phase measurements without involving information about directions to the reference transmitting station as well as information about the non-identity of the transmission coefficients of the channels and the deviation of the frames from orthogonality. In particular, this allows us to expand the scope of the possible use of the device for receivers operating in rangefinder mode

To solve this problem, in an antenna device containing two loop antennas located in orthogonal planes and connected to the inputs of the respective amplifiers, the output of the first amplifier through a phase shifter made in the form of a non-minimum phase link is connected to the first input of the adder, which performs the function of adding signals and the output of the second amplifier through the phase shifter, containing several series-connected identical non-minimum O-phase links, is connected to the second input of the adder, Tel'nykh introduced second adder performing signal subtraction function whose inputs are connected in parallel to respective inputs of the first adder, and a switch, whose output is the output of the antenna device, the first signal input switch coupled to an output of the first adder and the second signal output of the second adder.

S /// th /

channels and deviations from the orthogonality of the frames, at the output of the first and second adders have different signs, and the components depending on the phase of the received signal have the same signs, which allows for the subsequent comparison of the measurement results of the phases of the switched signals to compensate for multipolar components, that is, to carry out navigation phase measurements without involving information on directions to reference stations, on the difference between the transmission coefficients of the frame paths and deviations from the orthogonality of the frames.

The essence of the utility model and the possibility of its implementation is illustrated by the structural electrical diagram of the device shown in the figure.

The proposed antenna device (see figure) contains two loop antennas I and Non-located in orthogonal planes and connected to the inputs of the respective amplifiers 3 and 4, and the output of the first amplifier 3 through the phase shifter 5, made in the form of a non-minimum phase link 6, is connected to the first the input of the first adder 7, and the output of the second amplifier 4 through a phase shifter b containing several series-connected identical non-minimum phase links b, is connected to the second input of the first adder 7, The apparatus also includes a second function performs the subtraction € Shia adder 9, whose inputs are connected in parallel to respective inputs of the first adder 7, the outputs of adders 7 and 9 are connected to respective signal inputs of the switch 10 whose output is an output device.

The antenna device works as follows: The signals received by the mutually orthogonal frames I and 2 emitted by the reference stations of the radio navigation system (for example, Omega, Doran) are fed to the inputs of the first 3 and second amplifiers, and from the outputs of the amplifiers to the inputs of the corresponding phase shifters 5 and 8, which carry out a difference-phase shift between the signals by 90 °, the signal from the output of the phase shifter 5 is supplied in parallel to the first inputs of the first adder 7 and the second adder 9, and the signal from the step of the phase shifter 8 is fed in parallel to the second inputs adders 7 and 9 Adder 7 sums the signals arriving at its inputs, and adder 9 reads out. From the output of the first 7 and second 9 adders, the total and difference signals are fed to the corresponding first and second signal inputs of the switch 10, which transfers to the corresponding program the output of the antenna device of the total or differential signals, depending on the control signal. arriving at its third input.

Thus, signals having an output of orthogonal frames

and,. , and S.oC Ju-t-J,

U i / ,, t.5S P, c),

where: IS. 1f - signal amplitudes at the output of frames I and 2;

 and - azimuth to each transmitting station, taking into account deviations from the orthogonality of the frames; S and cos Bj are the amplitude characteristics due to

radiation patterns of frames; -. - circular frequency of the received signal; - phase of the received signal,

after passing through amplifiers 3 and 4 and phase shifters 5 and 8, acquiring a phase-difference shift of 90 °, take the form:

c. K-, g /, Sin i9,,

 LOSB,),

Where; k, and - transmission coefficients of amplifiers and phase shifters, or

 9, -V)}

where: O / -, C,

, the angle due to the deviation from the orthogonality of the directivity characteristics of the frames.

As a result of the addition of signals in the first adder 7, the signal at its output can be written in the form:

((9, A0) ti / s; n, ..cr ..

(Ij-l-J ll

a as a result of subtracting the signals in the second adder 9, the signal at its output has the form: and. // 2/7 7у7 Sin V Thus, the phase of the signal at the output of the switch has the value:

„,) C. or about

  C r // - l 2) 3 (Qfi-uQ)

which makes it possible, during subsequent navigational phase measurements in the transceiver, to compensate for the phase shift due to the dependence on the azimuth to the transmitting station and the non-identical characteristics of the antenna channels, without involving information about the directions to the transmitting stations, by averaging the phases of the two signals 6 / h.

Since usually 2y Z /, a, then with sufficient accuracy for practice the radiation pattern of the antenna device can be considered close to circular.

The proposed antenna device is implemented on nodes and devices known in the art, used, for example, in ship and aircraft radio navigation equipment, operating on the basis of signals from radio navigation systems such as Omega and Laurent. So, for a ship embodiment of the device as an antenna

g / S-4. / p U. 1. (b liUo i & f, any commercially available loop antenna can be used, for example, PR-1.3 as an amplifier, an adder that performs the function of adding signals., and the switch can be used similar elements of naval radio navigation devices, for example, rudder. performing the function of subtracting signals, does not cause any difficulties, since a conventional differential amplifier can be used for this. Non-minimum phase links can be implemented, as in the prototype, according to the scheme, etc. set in / 2, FIG. 2 /,

Thus, the claimed utility model is feasible, industrially feasible and solves the task of generating output signals that allow for the navigation phase measurements to compensate for errors that depend both on the non-identical transmission coefficients of the antenna frame paths and their deviation from orthogonality, and on the directions to the transmitting stations .

Therefore, the proposed antenna device, having all the positive qualities of the prototype, namely: broadband, the possibility of omnidirectional simultaneous reception of signals from several stations and radio navigation systems at different frequencies, has a positive feature, which consists in the possibility of compensating for the phase shift, as from the direction of reception, which eliminates the need to know the azimuths to the transmitting stations, as well as from the non-identity of the transmission coefficients of the tractors of the antenna framework and their deviations from orthogonality, which expands the scope of the possible use of the antenna device, in particular for receiver indicators operating in the rangefinder mode,

ZhTERATSA Second Certificate of the USSR No. 1g77262, class H01 q 7/08 D5.12.66,

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Claims (1)

An antenna device containing two loop antennas located in orthogonal planes and connected to the inputs of the respective amplifiers, the output of the first amplifier through the first phase shifter, made in the form of a non-minimum phase link, connected to the first input of the first adder, and the output of the second amplifier through the second phase shifter, made in the form of a group of series-connected identical non-minimum phase units, connected to the second input of the first adder, characterized in that it is additionally introduced There is a second adder, the first and second inputs of which are connected respectively to the outputs of the first and second phase shifters, as well as a switch whose output is the output of the antenna device, the first signal input of the switch connected to the output of the first adder, and the second signal input to the output of the second adder .