JPS5946565A - Bearing detector - Google Patents

Abstract

PURPOSE:To enable a bearing detection with a small scale of a receiver mechanism construction by comparing amplitudes of received signals with two systems of receivers; one receiving signals with a broad antenna beam, and the other receiving signals with a narrow antenna beam. CONSTITUTION:The received amplitude level of a receiver 2 with a broad beam is in a relative relationship with the received amplitude level of a receiver 7 with a narrow beam. It is so set that the received altitude level of the receiver with the broad beam is at the intersection of adjacent narrow beams. When receiving a signal with a narrow beam B, the receiver 7 is given an output of a larger received amplitude level of the receiver 2. The angle DELTAtheta of bearing is determined from the value of the amplitude level difference LBW1 with the receiver 2 corresponding to the difference between the coming direction of the signal and the beam nose direction of the narrow beam. When the amplitude level difference LAW1 of an amplitude comparator circuit 8 is below the reference level L0, the incoming direction is determined to be theta1 while when above L0, it is determined to be theta2 whereby the incoming bearing of the signal can be determined unconditionally. Thus, this has an advantage of allowing the detection of the bearing with a small scale of a receiver construction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an azimuth detection device that determines the direction of arrival of a signal from the amplitude difference between signals received by a plurality of receiving antenna beams.

Conventionally, this type of device is as shown in FIGS. 1 and 2.
A device is used that uses a plurality of narrow antenna beams at the same time and compares the amplitudes of signals received by each beam to detect the direction of arrival of a signal.

In Fig. 1 and Fig. 2, the wide beam antenna (11) and the receiver (2) are a receiving system (fl13 is the receiving output terminal of this receiving system) for identifying all objects to be detected in direction, and a narrow beam multi-beam Aerial line (3J, Q signal ('7 [1
1)～(7(→) or (7111), ('7F21
) and the amplitude comparison circuit (8) are an azimuth detection system for the target signal.

As shown in Fig. 3, the multi-beam antenna (3) consists of an array consisting of element antennas (4[11) to (4(n)) and a beam forming circuit (51) consisting of a baton matrix circuit or a substrate type lens. m antennas (m is regular)
(revised) narrow beam. Beam terminal (6111) ~ (
6 (→) is an antenna output terminal for signals received by each narrow beam. This multi-beam antenna (3) consists of m independent narrow-beam antennas (13 [11]) as shown in Figure 4.
~(13(m)) may be used in some cases. Since there is no essential difference in direction detection function between the two, the case where the multi-beam antenna shown in FIG. 3 is used will be described below.

In Figures 1 and 2, the amplitude comparison circuit (8) uses the fact that there is a one-to-one correspondence between the amplitude difference between the signals received by two adjacent narrow beams and the direction of arrival. The direction of arrival can be determined from the comparison. In the configuration shown in Figure 1, the amplitudes of signals received by m narrow beams are simultaneously compared, and in the configuration shown in Figure 2, the beam selection circuit (11Ill) and (11121
) to control two adjacent narrow beams by a control circuit (121
The signals received by two narrow beams directed in the signal arrival direction are simultaneously compared in amplitude, and the direction is detected based on the magnitude relationship.

According to the conventional configuration, it is necessary to use a receiver for identifying the direction detection target (in addition to a receiver for detecting the direction), and a large number of receivers of two or more series for detecting the direction.

As the configuration of the receiver becomes larger, the volume, etc.
This invention was created in order to solve the above-mentioned drawbacks of the direction detection device of the Congo Song Dynasty. By configuring the system to compare the amplitudes of the received signals of the receiving system using a wide beam antenna for identifying the target and the receiving system using the narrow beam antenna for detecting the direction, The object of the present invention is to provide a device capable of detecting direction with a receiver configuration of this size.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 5, the same reference numerals as those in FIGS. 11 to 4 indicate the same or equivalent parts, and hereinafter, the explanation of the structure and supplementary explanation thereof will be given together.

(11 is a wide beam antenna such as omnidirectional, and (2) is a receiver.The receiver (2) is a wide beam antenna (11) from which it selects functions such as frequency selectivity from the signals received. and outputs the received amplitude value for amplitude comparison. (3) is a multi-beam antenna with m narrow beams, (6) is a beam terminal of multi-beam antenna (3), and (11) is a multi-beam antenna with m narrow beams. Beam selection circuit for selecting one of the narrow beams of F+21 !'l: Beam selection circuit i@(Il
This is a side circuit that controls the beam selection by l to be performed sequentially in the order in which all beams are lined up. +71 is a receiver which outputs the amplitude value of the signal received by one beam selected by the beam selection circuit (11). +91 is an amplitude comparison circuit which compares the amplitude value output from the receiver (2) with the amplitude value output from the receiver (71) for the input signal identified by the receiver (2) as the direction measurement target signal. The receiver (2) and the receiver in the previous state, that is, the beam next to the beam currently selected by the selection circuit (11), which is stored in the storage circuit (14), are compared. machine +7
This is an amplitude comparison circuit that determines the amplitude difference of 1 and outputs the direction of arrival of the input signal to the direction output terminal (9).

Next, the operation will be explained.

The amplitude of the signal received by the wide beam antenna (1) and the receiver (2) and the amplitude of the signal received by the multibeam antenna (3) and the receiver (71) have the relationship shown in Fig. 6 with the direction of arrival. The received signal amplitude reflects the beam pattern of the antenna used for reception.

FIG. 6 shows the pattern of the amplitude level of the received signal for three continuous beams out of the wide beam and the narrow beams that are sequentially switched and received. In the same figure, the reception amplitude level of the wide beam receiver (2) and the narrow beam receiver (71) are shown.
The received amplitude levels of the two are relative, and one can be set to an arbitrary level with respect to the other. Here, the reception amplitude level of the wide beam is set to be at the intersection point of adjacent narrow beams (the point where the reception levels are the same).
Even in this case, the generality of the operation and operation description is not lost.

For example, when receiving with narrow beam B pointing in the direction of signal arrival as shown in FIG. The receiver (71) has an output with an amplitude level greater than the reception amplitude level of the receiver (2).

At this time, the amplitude level difference LBWI between this and receiver (2)
is determined by the amplitude comparison circuit (8), and the corresponding azimuth difference Δθ is determined from the value of the amplitude level difference LBw as the difference between the signal arrival azimuth and the beam nose direction of the narrow beam.

In the 6th part 1, if the signal arrival direction is 01, the amplitude level difference for the signal input from the direction 02 which is symmetrical to the signal arrival direction θ1 with respect to the beam nose direction θ0 of the narrow beam B: [, IBW 2 is equal to the amplitude level difference LBWI unless the narrow beam pattern is asymmetric, so the orientation difference Δ
Regarding θ, two types of signal arrival directions are assumed: azimuth 01 and front azimuth θ2 shown in FIG.

Since the memory circuit (I4) of No. 51 T1 stores the amplitude level difference before switching to narrow beam B, that is, the amplitude level difference LAWI during reception by narrow beam A in FIG. 6, the amplitude comparison circuit +81 Amplitude level difference r, +Awz h
If it is below the reference level LO shown at the 6th station, the direction of arrival of the signal is determined to be θl, and the reference level L is determined. If the signal arrival direction is above, the signal arrival direction is uniquely determined by determining the signal arrival direction as 02.

In addition, in the above embodiment, the memory content L of the memory circuit (14)
Although the AWI is used only to uniquely determine the signal arrival direction, the present invention is not limited to this, and the AWI is not limited to this, and the amplitude level difference TJ obtained between the memory content LAW1 of the memory circuit (14) and the current input is used.
BW1, that is, the amplitude level difference LA shown in FIG.
It is clear that the corresponding signal arrival direction can be determined from B using the same direction detection method as in the conventional direction detection device. In this case, even if there is a fluctuation in the level of the arriving signal between the time of reception with narrow beam A and the time of reception with narrow beam, the effect is canceled out and the amplitude level difference LAB[ is not bounded, so the influence of the level fluctuation of the arrival signal Direction detection is possible without being affected by

As explained above, the present invention is configured to compare the amplitudes of received signals using two receiver systems, one receiving with a wide antenna beam and the other receiving with a narrow antenna beam. It has the advantage of being able to detect the direction based on the aircraft configuration.

[Brief explanation of drawings]

Figures 1 and 2 are configuration diagrams of a conventional direction detection device;
1 and 4 are illustrations of a narrow beam antenna, FIG. 5 is a block diagram showing an example of the orientation detection device of the present invention, and FIG. 6 is a diagram showing the configuration of an embodiment of the orientation detection device It is an operation explanatory diagram. In the figure, (11 is a wide beam antenna, (2) is a receiver, (3) is an azimuth antenna, (7) is a receiver, (81 is an amplitude comparison circuit, (9) is an azimuth output terminal, and no is a beam selection. circuit, (1
21 is the side-turning circuit, (+4+ is the memory circuit. Agent Shin Kuzuno - Figure 1 Figure 3 Figure 4 Figure 4)

Claims (1)

[Claims] A first receiving device consisting of a wide beam antenna having a wide beam width and a receiver that converts a received signal obtained by the antenna into a predetermined electrical signal and outputs it, the direction of the beam nose being in a predetermined direction. a plurality of narrow-beam antennas having narrow beam widths, a selection circuit that sequentially switches their antenna outputs in a predetermined order and outputs one predetermined antenna output; and a reception obtained at the output of the selection circuit. a second receiving device comprising a receiver that converts a signal into a predetermined electrical signal and outputs the same; determining the amplitude difference between the output level of the first receiving device and the output level of the second receiving device;
A device that stores this amplitude difference signal in correspondence with each narrow beam antenna, and a device that calculates and determines the azimuth angle of a received incoming signal from the amplitude difference signal based on the relative relationship between the output characteristics of adjacent narrow beam antennas. Direction detection device equipped with