RU2124807C1 - Receiving-transmitting unit of phased antenna array - Google Patents

Abstract

FIELD: antenna equipment. SUBSTANCE: goal of invention is achieved by introduced multiplexer for n-bit codes, n-bit memory unit, m-bit binary adder (m>n), rectangular pulse generator, which provides of grater jitter frequency of phase state of unit within range of rounding constant. Antenna array consisting of such units provide chaotic phase jitter (dynamic phase rounding). EFFECT: increased efficiency of time method for interruption of phase sampling error period in phased antenna array aperture in order to increase precision of beam pattern setting and to decrease side lobe level. 1 dwg

Description

 The invention relates to the field of antenna technology, in particular to a beam control system for a phased array antenna (PAR) and can be used in receiving, transmitting or transmitting modules of active phased array antennas (AFAR).

Known antenna array with high resolution [1,2], where it is proposed to change the phase of the excitation of all elements of the antenna array at the same time in each sensing period by the same value d _p , while summing the code of the quantity d _p with the codes for the installation of discrete phase shifters carried out before rounding off the latter.

The disadvantage of the device [1] is the low frequency of the phase shift d _p due to the limited performance of the computing operations of a single centralized beam control system. This leads to the fact that the number of phase sets formed in this case for averaging the angular errors per unit time is limited; as a result, the efficiency of the method of decorrelation of phase errors decreases.

 An AFAR transceiver module is also known, comprising a discrete phase shifter included in the high-frequency path of the module, a phase shifter control circuit and a memory device that corrects the phase characteristic of the antenna array [3].

 The disadvantage of this device is the lack of autonomous means of decorrelating (destroying) the frequency distribution of phase quantization errors in the AFAR aperture to increase the accuracy of beam alignment in space and reduce the level of the side lobes of the antenna array.

 The aim of this invention is to increase the accuracy of the installation of the radiation pattern (NAM) and reducing the level of the side lobes AFAR.

 This goal is achieved by the fact that an n-bit code multiplexer, an n-bit memory cell, an m-bit binary adder (m> n), and a square-wave generator, as a result of which provides random jitter with a high frequency, are additionally introduced into the AFAR transceiver module "phases of individual AFAR modules for decorrelation of the frequency distribution of phase errors.

 The drawing shows a diagram of the proposed transceiver module AFAR.

 The proposed transceiver module 1 contains an n-bit discrete phase shifter 2 included in the high-frequency path 3, an n-bit code multiplexer 4, a square-wave pulse generator 5, an n-bit memory cell 6, an m-bit binary adder 7, and a control unit 8 of a discrete phase shifter.

где
Φ $\genfrac{}{}{0ex}{}{\text{n}}{\text{x,y}}$ - результирующий n-разрядный выходной код управления дискретным фазовращателем модуля с координатами X, Y в апертуре АФАР;
φ $\genfrac{}{}{0ex}{}{\text{n}}{\text{x,y}}$ - n-разрядный выходной код управления дискретным фазовращателем модуля с координатами X, Y в апертуре АФАР;
{v}_τ - оператор динамического "ИЛИ" со скоростью переключения t;
φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{x,y}}$ - m-разрядный выходной код управления дискретным фазовращателем модуля с координатами X, Y в апертуре АФАР, при этом m>n;
φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{0}}$ - m-разрядная фазовая константа округления;

оператор n-разрядного выходного кода.The functioning algorithm of the proposed device is determined by the following expression:

Where
Φ $\genfrac{}{}{0ex}{}{\text{n}}{\text{x, y}}$ - the resulting n-bit output control code of the discrete module phase shifter with coordinates X, Y in the AFAR aperture;
φ $\genfrac{}{}{0ex}{}{\text{n}}{\text{x, y}}$ - n-bit output control code for a discrete module phase shifter with coordinates X, Y in the AFAR aperture;
{v} _τ - dynamic "OR" operator with switching speed t;
φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{x, y}}$ - m-bit output control code of the discrete phase shifter of the module with coordinates X, Y in the aperture of the AFAR, with m>n;
φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{0}}$ - m-bit phase constant of rounding;

n-bit output code operator.

Рассмотрим два примера:
1. Пусть φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{x,y}}$ = 0011; φ $\genfrac{}{}{0ex}{}{\text{n}}{\text{x,y}}$ = 001; φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{0}}$ = 0001,
тогда

Φ_x,y= 001{v}_τ010.
2. Пусть φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{x,y}}$ = 0010; φ $\genfrac{}{}{0ex}{}{\text{n}}{\text{x,y}}$ = 001; φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{0}}$ = 0001,
тогда

Φ_x,y= 001{v}_τ001.
Таким образом, код управления дискретным фазовращателем, в первом примере, будет переключаться мультиплексором из одного значения 001 в другое 010.As a result of the operation of the operator {v} _τ at various times, the expression
Φ $\genfrac{}{}{0ex}{}{\text{n}}{\text{x, y}}$ = φ $\genfrac{}{}{0ex}{}{\text{n}}{\text{x, y}}$ at τ = t;

Let's look at two examples:
1. Let φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{x, y}}$ = 0011; φ $\genfrac{}{}{0ex}{}{\text{n}}{\text{x, y}}$ = 001; φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{0}}$ = 0001,
then

Φ _{x, y} = 001 {v} _τ 010.
2. Let φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{x, y}}$ = 0010; φ $\genfrac{}{}{0ex}{}{\text{n}}{\text{x, y}}$ = 001; φ $\genfrac{}{}{0ex}{}{\text{m}}{\text{0}}$ = 0001,
then

Φ _{x, y} = 001 {v} _τ 001.
Thus, the control code of the discrete phase shifter, in the first example, will be switched by the multiplexer from one value 001 to another 010.

 In another example, the control code will remain unchanged 001.

 The switching frequency can be quite high, and mainly limited by the speed of the discrete phase shifter 2.

 Thus, the phase state of some AFAR modules will switch from one state to another with a high frequency.

 Such an autonomous “jitter” of the phase of individual transceiver modules of the AFAR, within the rounding constant with a constant direction of the beam, allows the high-efficiency time method of decorrelation of the frequency distribution of the errors of quantization of the phase in the AFAR aperture to be implemented.

The high efficiency of using the temporary decorrelation method in the proposed device is due to three factors:
- high frequency switching phase states (megahertz);
- independent, autonomous operation of pulse generators 5 in separate AFAR modules, which creates an additional element of random decorrelation;
- different from each other, the frequency value of the generators 5, further enhances the element of randomness.

 The proposed device can be implemented on discrete elements, on large integrated circuits or through controllers.

Sources of information
1. US patent N 3387301, NKI 343-100.

 2. V.I. Samoilenko, Yu.A. Shishov Management of phased array antennas. - M.: Radio and Communications, 1983, p. 142.

 3. Japan Patent N 61-117902, cl. H 01 Q 3/34.

Claims (1)

 AFAR transceiver module containing an n-bit discrete phase shifter included in the high-frequency path of the module, a discrete phase shifter control unit, the input of which is an input of the module for issuing control commands, characterized in that the module further comprises an n-bit code multiplexer, an n-bit memory cell , m-bit binary adder (m> n), a square-wave generator connected by its output to the control input of the n-bit code multiplexer, with n outputs of the n-bit multiplexer codes are respectively connected to the control inputs of an n-bit discrete phase shifter, one n inputs of the n-bit code multiplexer are connected to n outputs of an n-bit memory cell, n information inputs of which are connected to n high-order bits of an m-bit binary adder, one m of which inputs are connected with the first outputs of the discrete phase shifter control unit equipped with a phase constant code, the other m inputs of the m-bit binary adder are connected to the second m outputs of the discrete phase shifter control unit m, of which n outputs corresponding to the higher bits of the code are respectively connected to the second n inputs of the multiplexer of n-bit codes.