JPH05209955A - Second search radar device - Google Patents

Abstract

PURPOSE:To prevent a target from being lost due to the differential loading of a sum beam and an SLS beam in the second search radar device of electronic scanning type. CONSTITUTION:This radar device is equipped with an SLS power distributor 5 for distributing an SLS signal in two directions, a sum/differential/SLS beam concurrent synthesizing power distributor 4 for distributing a sum beam signal, a differential signal beam and an SLS beam, a Butler matrix circuit 3 for transmitting a signal from column array aerials 1a to 1g for suppressing the side lobe of a sum beam pattern 10, and transmitting an SLS beam signal from a single column array aerial 1p for suppressing the back lobe of the sum beam pattern 10, and high-frequency selectors 2a to 2h.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an SLS for an electronic scanning secondary search radar antenna using a Butler matrix circuit.
Regarding the antenna.

[0002]

2. Description of the Related Art In a conventional example, an SLS antenna and a column array antenna for sum / difference beam radiation are provided independently.
Next, a conventional example will be described with reference to the drawings. FIG. 3 is a system diagram of a conventional example, and FIG. 4 is a diagram showing a beam pattern of the conventional example. In the conventional example, the column array antennas 13a to 13x for sum beam and difference beam radiation, the high frequency switching device 1 are used.
4a to 14h, Butler matrix circuit 15, sum / difference beam simultaneous combining power divider 16 and SLS antenna 19
Equipped with. When an electronic scanning antenna is realized using the Butler matrix circuit 15, the column array antenna 13
The circumference of a to 13x is divided into integers, the column array antenna in one range is fed, and the other elements are not fed. FIG. 3 shows an example in which the circumference is divided into three parts. 120 each other
Since the column array antennas apart from each other are not simultaneously supplied with power, the output of the Butler matrix circuit 15 is set to SP3.
Switching is performed by the T-type high frequency switching devices 14a to 14h. The sum beam signal / difference beam signal and the SLS beam signal of the secondary search radar transmitter / receiver are connected to the sum beam input / output terminal 17, the difference beam output terminal 18, and the SLS beam input / output terminal 20, respectively.

FIG. 6 is a circuit diagram of a power divider 16 for simultaneous sum and difference beam combining. The power divider 16 for simultaneous sum / difference beam combination is a circuit for giving an appropriate aperture distribution to each element of the column array antenna. The sum beam signal and the difference beam signal connected to the sum beam input / output terminal 25 and the difference beam output terminal 26 are connected to the power distributor output / input terminals 31a to 31h. Here, the power distributor output / input terminals 31a to 31
The sum beam signals are Aa to Ah, and the difference beam signals are Ba to Bh. The sum beam signal at the sum beam input / output terminal 25 is split into two equal phases in the rat race circuit 27, and the tandem feed circuits 30a and 30a are provided.
0b. Tandem feed circuit 3
Reference numerals 0a and 30b denote power feeding circuits that have two systems of power distribution circuits and output the sum of the outputs of the power distribution circuits. The sum beam signal connected to the tandem feed circuits 30a and 30b is distributed to Aa to Ah by the power distribution circuit of one system of the tandem feed circuits 30a and 30b, and the power distributor output / input terminals 31a to 31h, respectively.
Input and output with. The difference beam signal from the difference beam output terminal 26 is processed by the difference beam distribution circuit 29 as Σ (Aa to Ah): Σ
((Ba-Aa) to (Bh-Ah)), one of which is equally distributed in opposite phase by the rat race circuit 27 and is connected to the power distribution circuit of the system in which the sum beam signals of the tandem feed circuits 30a and 30b are connected. The other side is connected to the power distribution circuit of another system of the tandem feed circuits 30a and 30b. The differential beam signals are distributed and combined to An + (Bn-An) = Bn in the tandem feed circuits 30a and 30b, and connected to the power distributor output / input terminals 31a to 31h. The high frequency signals distributed by the power divider 16 for simultaneous sum / difference beam combination to one-third of the array number of the column array antennas 13a to 13x are rearranged by the Butler matrix circuit 15 and the high frequency switches 14a to 14h.
And the beam pattern 22 and the difference beam pattern 23 are formed from the range of one-third of the column array antennas 13a to 13x. The SLS signal is connected to the SLS beam input / output terminal 20, and the column array antenna 13a is connected.
-13x SL provided independently of SLS antenna 19
The S beam pattern 24 is formed. In the case of reception, a high frequency signal is output to the secondary search radar transmitter / receiver via a route opposite to this. The scanning in the beam radiation direction is performed by the Butler matrix circuit 15 and the high frequency switching devices 14a to 14h.
By switching the column array antenna that emits a signal.

[0004]

SUMMARY OF THE INVENTION Such a conventional example is as follows.
Since the column array antenna and the SLS antenna are independent, the effect of roving due to ground reflection is not the same for the sum / difference beam and the SLS beam, and there is a drawback that the target is lost by the differential roving.

The present invention eliminates such drawbacks, and an object of the present invention is to provide a secondary search radar apparatus having means for preventing the target lost due to the differential roving of the sum beam and the SLS beam. ..

[0006]

According to the present invention, there is provided a column array antenna having a plurality of antennas forming a sum beam and a difference beam, and a Butler matrix circuit for rearranging high frequency signals radiated by the column array antenna. In a secondary search radar device equipped with a high-frequency switcher for switching the antennas constituting a column array antenna, a high-frequency signal is simultaneously combined into a sum beam signal, a difference beam signal and an SLS beam signal and distributed to the Butler matrix circuit.・ Differential / SLS beam simultaneous combining power divider and SLS beam signal are divided into two, one is given to the Butler matrix circuit, and the other is given to the sum / difference / SLS
And a power distributor for SLS applied to the power distributor for simultaneous beam synthesis.

The sum / difference / SLS beam simultaneous power distributor has means for synthesizing the SLS beams to radiate in the same direction and in opposite directions with respect to the direction of the sum beam. Is desirable.

[0008]

The radiation direction 9 of the sum beam pattern 10 is the front direction of the column array antenna 1d.
When 0 is radiated from the column array antennas 1a to 1g, the SLS signal is divided into two by the SLS power divider,
For the purpose of suppressing the side lobe of the sum beam pattern 10, the sum / difference / SLS beam simultaneous combining power distributor distributes and radiates from the column array antennas 1a to 1g, and suppresses the back lobe of the sum beam pattern 10. SLS signal is emitted from one column array antenna 1p for the purpose of S
Form an LS pattern. A Butler matrix circuit and a high frequency switch are used to scan the radiation direction.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of this embodiment, and FIG. 2 is a pattern of this embodiment.

In this embodiment, as shown in FIG. 1, a column array antenna 1a to 1x having a plurality of antennas forming a sum beam and a difference beam, and a high frequency signal radiated by the column array antennas 1a to 1x. Butler matrix circuit 3 for rearranging and high frequency switching devices 2a-2 for switching antennas 1a-1x forming a column array antenna.
h, and as a feature of the present invention,
High-frequency signal to sum beam signal, difference beam signal and SLS
A power divider 4 for simultaneous sum / difference / SLS beam simultaneous synthesis that combines the beam signals simultaneously and distributes them to the Butler matrix circuit 3 and an SLS beam signal that is distributed to two, one of which is given to the Butler matrix circuit 3 and the other Sum / difference / SL
The power divider 5 for SLS, which is provided to the power divider 4 for S-beam simultaneous combining, includes the power divider 4 for simultaneous sum / difference / SLS beam combining in the same direction and in the opposite direction with respect to the direction of the sum beam. It has a means to perform synthesis that radiates in each direction.

Next, the operation of this embodiment will be described. When an electronic scanning antenna is realized by using the Butler matrix circuit 3, the column array antenna 1a on the circumference of the antenna is ...
1x is divided into integers, and radiation is performed from a part thereof. The case where the sum beam is radiated in the front direction 1d when the column array antennas 1a to 1x are divided into three will be described. In this embodiment, since another column array antenna 1p is used for the purpose of radiating the SLS signal in the opposite direction to the sum / difference signal, the number of elements 24 of the column array antennas 1a to 1x is divided into three "8". The sum / difference signals are radiated from the column array antennas 1a to 1g of "7" which is obtained by subtracting "1".

The sum beam signal, the difference beam signal and the SLS beam signal of the secondary search radar transmitter / receiver are respectively connected to the sum beam input / output terminal 6, the difference beam output terminal 7 and the SL.
It is connected to the S-beam input / output terminal 8. The sum signal and the difference signal are directly input from the sum beam input / output terminal 6 and the difference beam output terminal 7 to the power divider 4 for simultaneous sum / difference / SLS beam combination, but the SLS input / output signal is a sum / difference beam. In order to radiate in the same direction and in the opposite direction, the power is distributed by the SLS power distributor 5, and one of them is input to the sum / difference / SLS beam simultaneous power distributor 4. The sum beam signal, the difference beam signal, and the SLS beam signal are combined by the sum / difference / SLS beam simultaneous power distributor 4 in the column array antennas 1a to 1a.
The high frequency signal distributed to the array number 7 of h is input to the Butler matrix circuit 3. FIG. 5 is a circuit diagram of the power divider 4 for simultaneous sum / difference / SLS beam simultaneous synthesis. Sum / Difference / S
The LS beam simultaneous combining power divider 4 is a circuit that gives an appropriate aperture distribution to each element of the column array antenna. Sum beam input / output terminal 32, difference beam output terminal 33 and SL
The respective input / output signals of the S beam input / output terminal 34 are connected to the power distributor output / input terminals 40a-40g. Here, the input and output values of the power distributor output / input terminals 40a to 40g are Aa to Ag for the sum beam signal, Ba to Bg for the difference beam signal, and Ca to Cg for the SLS beam signal. The sum beam signal at the sum beam input / output terminal 32 is radiated from the central element of the column array antenna at a ratio Ad: Σ (Aa to A
c, Ae to Ag) are distributed by the sum beam / SLS beam distribution circuit 37, and one of them is connected to the power distributor output / input terminal 40d. The remaining sum beam signal is the rat race circuit 3
The tandem feed circuit 39a is divided into two equal phases by 5
And 39b, respectively. The tandem feed circuits 39a and 39b are power supply circuits that have two systems of power distribution circuits and each output the sum of the outputs of the power distribution circuits. The sum beam signal connected to the tandem feed circuits 39a and 39b is
The sum beam signals connected to a and 39b are distributed to Aa to Ac and Ae to Ag by the power distribution circuit of one system of the tandem feed circuits 39a and 39b, and the power distributor output / input terminals 40a to 40c and the power distributor are respectively distributed. Input / output is performed at the device output / input terminals 40e to 40g. The difference beam signal from the difference beam output terminal 33 is Σ
(Aa to Ac, Ae to Ag): Σ (Ba-Aa) to (B
c-Ac), (Be-Ae) to (Bg-Ag)), one of which is equally distributed in opposite phase by the rat race circuit 35 and is connected to the sum beam signals of the tandem feed circuits 39a and 39b. The other side is connected to the power distribution circuit, and the other side is connected to the power distribution circuit of another system of the tandem feed circuits 39a and 39b. The differential beam signal is output by An + (Bn-A in the tandem feed circuits 39a and 39b.
n) = Bn is distributed and combined, and the power distributor output / input terminal 40
a to 40c and power distributor output / input terminals 40e to 40g
Connected to. The SLS beam signal from the SLS beam input / output terminal 34 is processed by Σ in the sum beam / SLS beam distribution circuit 37.
(Aa to Ac, Ae to Ag): Ad = Cd: Σ (Ca to
Cc, Ce to Cg), one of which is directly connected to the power distributor output / input terminal 40d, and the other of which is connected to the power distribution system of the sum beam to output power distributor output / input terminals 40a to 40c and power distributor output / input terminal 40e. ~ 40g Ca ~ Cc, Ce
Connected at a ratio of ~ Cg. The Butler matrix circuit 3 rearranges the eight signals to which the seven outputs of the power divider 4 for sum / difference / SLS beam simultaneous synthesis and the other output of the SLS power divider 5 are rearranged to the high frequency switching devices 2a to 2h. Output. Scanning in the beam radiation direction is performed by switching the column array antenna with the Butler matrix circuit 3 and the high frequency switching devices 2a to 2h. In the case of this embodiment, in order to radiate the sum beam in the front direction of 1d, the seven outputs of the power divider 4 for simultaneous sum / difference / SLS beam simultaneous synthesis are outputted to the high frequency switching devices 2a to 2g, and the power for SLS is outputted. The other output of the distributor 5 is output to the high frequency switch 2h. The high frequency switching devices 2a to 2h switch the high frequency input signal to the element of the column array antennas 1a to 1x that radiates the high frequency signal. High frequency switch 2a-2
g is switched to each of the column array antennas 1a to 1g, and the high frequency switch 2h is connected to the column array antenna 1p.
Is switched to. The column array antennas 1a-1g form the sum beam pattern 10 and the difference beam pattern 11, and the column array antennas 1a-1g and the column array antenna p form the SLS beam pattern 12.

The SLS beam pattern 12 of the present invention has a figure-eight shape, but since the radiation in the lateral direction of the sum beam pattern 10 is sufficiently small, the sum beam pattern 12 is formed by forming the SLS beam pattern 12 in the front and rear directions. It is possible to suppress 10 side lobes and back lobes.

[0014]

As described above, the present invention provides SLS.
Since the beam is radiated and received using the same column array antenna as the sum beam, the effect of roving due to ground reflection is the same as that of the sum beam and the SLS beam, and there is an effect that the target loss due to differential roving can be prevented. In addition, by replacing the power distributor for simultaneous formation of the sum and difference beams of the conventional electronic scanning secondary search radar antenna device and adding the power distributor for SLS, a Butler matrix circuit, a high frequency switching device and a column array antenna Since the same one can be used, there is an effect that the present invention can be implemented easily and inexpensively.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a beam pattern according to an embodiment of the present invention.

FIG. 3 is a block configuration diagram showing a configuration of a conventional example.

FIG. 4 is a diagram showing a beam pattern of a conventional example.

5 is a circuit diagram showing a configuration of a power divider for simultaneous formation of sum, difference and SLS beams included in FIG. 1. FIG.

FIG. 6 is a circuit diagram showing a configuration of a power divider for simultaneous formation of sum and difference beams included in FIG.

[Explanation of symbols]

 1a to 1x Column array antenna 2a to 2h High-frequency switching device 3 Butler matrix circuit 4 Sum, difference, SLS beam simultaneous combining power distributor 5 SLS power distributor 6 Sum beam input / output terminal 7 Difference beam output terminal 8 SLS beam input Output terminal 9 Sum beam radiation direction 10 Sum beam pattern 11 Difference beam pattern 12 SLS beam pattern 13a to 13x Column array antenna 14a to 14h High-frequency switcher 15 Butler matrix circuit 16 Power divider for simultaneous sum and difference beam combination 17 Sum beam input Output terminal 18 Difference beam output terminal 19 SLS antenna 20 SLS beam input / output terminal 21 Sum beam radiation direction 22 Sum beam pattern 23 Difference beam pattern 24 SLS beam pattern 25 Sum beam input / output terminal 26 Difference beam output terminal 27 Latray Circuit 28 rat race circuit 29 difference beam distribution circuit 30a, 30b tandem feed circuit 31a to 31h power distributor output / input terminal 32 sum beam input / output terminal 33 difference beam output terminal 34 SLS beam input / output terminal 35 rat race circuit 36 rat race Circuit 37 Sum beam / SLS beam distribution circuit 38 Difference beam distribution circuit 39a, 39b Tandem feed circuit 40a-40g Power distributor output / input terminal

Claims (2)

[Claims] 1. A column array antenna having a plurality of antennas forming a sum beam and a difference beam, a Butler matrix circuit for rearranging high-frequency signals radiated by the column array antenna, and an antenna forming the column array antenna. In a secondary search radar device provided with a high frequency switch for switching, a high frequency signal is added to a sum beam signal, a difference beam signal and an SLS.
A power divider for simultaneous sum / difference / SLS beam simultaneous synthesis that simultaneously synthesizes the beam signals and distributes to the Butler matrix circuit, and an SLS beam signal is split into two, one of them is given to the Butler matrix circuit, and the other is given to the above. A secondary search radar device, comprising: an SLS power divider to be applied to a sum / difference / SLS beam simultaneous synthesis power divider. 2. The sum / difference / SLS beam simultaneous combining power distributor has means for synthesizing the SLS beams to radiate in the same direction and in opposite directions with respect to the direction of the sum beam. 2. The secondary search radar device according to 1.