KR20000074104A - Direction detect apparatus using circle arrangement composition of equal angle - Google Patents

Abstract

PURPOSE: A direction detecting device is provided to improve a direction-detection accuracy by adding a weight to a portion where the accuracy is excellent. CONSTITUTION: A direction detecting device comprises a calculation block(610) which converts video signals of odd and even channels to measure maximum values of odd and even channels. A selector calculating part(620) receives the maximum values from the calculation block(610) to calculate a sector value. A channel compensating block(630) compensates the nonlinear characteristics with regard to an output signal of the calculation block(610) with reference to the sector value. An amplitude difference calculating block(640) calculates an amplitude difference of the odd channel and an amplitude difference of the even channel, and an amplitude difference of adjacent beams in response to an output signal of the block(630). A period direction calculating block(650) calculates period directions of the odd and even channels and of the adjacent beams. An intersection amplitude period direction calculating part(660) obtains a channel amplitude difference by comparing the period directions from the block(650) with a sector direction of the calculation part(620), and calculates a direction of a mixing amplitude period by adding a weight to a sector where a direction-detection accuracy is stable.

Description

DIRECTION DETECT APPARATUS USING CIRCLE ARRANGEMENT COMPOSITION OF EQUAL ANGLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direction detection technique, and more particularly, to a direction detecting apparatus having a conformal circular arrangement.

The direction detection device aims to provide information regarding the direction of arrival for each of the received pulses.

In general, the direction detecting apparatus is composed of a certain number of channels directly connected to the antenna to form a monopulse network.

Amplitude comparison method is the most widely used universal anti-sense method because of its simple structure and excellent instantaneous anti-sense ability.

Common amplitude comparison probes In order to detect the omnidirectional, a plurality of antennas are configured in an isometric circular array structure.

The number of antennas is preferred, such as four, six or eight.

In general, a probe using four antennas has a frequency range of 10 to 15 in the frequency range of 2 to 18 GHz. The detection accuracy using 8 antennas with RMS accuracy is 4 ~ 6 It is known to have a RMS accuracy of detection.

In addition, a spiral antenna having a relatively small amount of change in the beam pattern according to frequency is used for the anti-explosion antenna used for wideband.

The 3dB beamwidth of the spiral antenna is about 70 And typically increase in low frequency bands.

Fig. 1 is a block diagram showing a typical amplitude comparison monopulse device using four antennas, and as shown therein, a high frequency signal received by antennas 101 to 104 (Fig. To ) By amplifying and detecting a predetermined level To Amplifiers 111 to 114 and a video signal from the amplifiers 111 to 114 To Compares two signals between adjacent amplifiers. To It is comprised by the comparators 121-124 which calculate | require ().

Referring to the operation of the general amplitude comparison probe device as follows.

Any direction ( High frequency signal from To ) Is received by the antennas 101 to 104 and input to the amplifiers 111 to 114, the amplifiers 111 to 114 are amplified by a predetermined level, detected, and detected by the video signal ( To ) Is output to two adjacent comparators of the comparators 121 to 124.

That is, the video signal from the amplifier 111 ( ) Is input to the comparators 121 and 124 and the video signal ( ) Is input to the comparators 121 and 122 and the video signal (< / RTI > ) Is input to the comparators 123 and 124 and the video signal ( ) Is input to the comparators 124 and 121.

At this time, the comparators 121 to 124 use four video signals ( To ) Compare two adjacent signals with each other To )

Therefore, the amplitude difference in the comparators 121-124 ( To ) To obtain the arrival direction information.

If the signal source is any angle (receivable by the antenna 101, 102) ) Is an angle ( The amplitude difference between the two antennas (101, 102) Is represented by ), You can find the direction of the incident signal.

At this time, the signal intensity distribution received by the two antennas 101 and 102 is as shown in the waveform diagram of FIG.

Accordingly, any direction ( Received from the received antenna Signal strength varies according to), and from this, the angle of arrival (AOA) information can be obtained.

For example, FIGS. 3A and 3B show a probe antenna In the case of eight circular arrangements, the distribution of the slopes of the adjacent comparison amplitude difference and the detection error measurement of the four antennas are respectively shown.

67.5 in the case of the antenna 2 beam and the antenna 3 beam The crossover point in the vicinity is the part where the slope of the amplitude of the two beams is stable and the detection accuracy is excellent due to the small amplitude difference.

The characteristics of good detection accuracy near these intersections are 45 Pair, 60 90 pairs The same pattern is shown in the pair comparison technique.

In addition, if the compensation data is extracted after measuring an accurate antenna pattern for each frequency, relatively high detection accuracy can be obtained in a wide band.

However, in general, the amplitude comparison method cannot accurately match amplitudes between channels, antennas, and receiving channels (amplifiers, detectors, etc.), and thus has a disadvantage in that high accuracy cannot be obtained.

For example, in FIG. 3, the incident signal 1 and the incident signal 2 incident between the antenna 2 and the antenna 3 are 67.5 near the intersection when the orientation is measured using the antenna (2,3) pair. Unlike the vicinity, it is located in the area where the measurement error of detection is large.

Therefore, the general amplitude comparison observation apparatus has a problem in that the amplitude difference becomes unstable as the amplitude gradient constituting the amplitude difference becomes more unstable toward both antennas (antenna boresight) at the intersection point, so that the accuracy of the detection is significantly reduced.

Therefore, in order to solve the conventional problems, the present invention is directed to an isometric device having an isometric circular array structure which improves the detection accuracy by selecting and weighting only parts having excellent detection accuracy by using two pairs of amplitude differences. The purpose is to provide.

1 is a block diagram of a general direction detection device of the monopulse type.

2 is a waveform diagram showing signal intensity distribution at the time of signal reception between two antennas.

Fig. 45 Illustrated diagram showing the distribution of the slope of the relative comparison amplitude difference and the azimuth measurement error of four antennas in an isotropic array.

Fig. 45 45 of isometric arrays With 90 Illustrated diagram showing the distribution of the amplitude difference slope and the orientation measurement error distribution of a pair.

Fig. 45 90 of conformal arrays With 90 Illustrated diagram showing the distribution of the amplitude difference slope and the orientation measurement error distribution of a pair.

Fig. 45 90 of conformal arrays With 90 Block diagram of a pair of direction finders.

*** Explanation of symbols for the main parts of the drawing ***

610: operation block for each channel 620: sector operation unit

630: channel compensation block 640: amplitude difference calculation block

650: section bearing calculation block 660: cross amplitude section bearing calculation unit

670: bearing selection unit 680: bearing information calculation unit

In order to achieve the above object, the present invention provides a channel-specific operation block for detecting a video signal from a signal received in an arbitrary direction by a plurality of antennas and measuring a maximum value and a difference maximum value for each channel, and the odd and even A sector calculation unit for calculating a sector value by calculating a maximum value of a channel, a channel compensation block for compensating for nonlinearity with respect to a maximum value and a difference maximum value for each channel by referring to an operating frequency and the sector value, and a channel compensation block for Amplitude difference calculation block for calculating amplitude differences between adjacent beams, odd channels and even channels with an output signal, and adjacent beam section orientation and section orientations for odd and even channels with input signals of the amplitude difference calculation block. A cross section for calculating weights by selecting specific sectors by inputting section bearing calculation blocks to be divided and section bearings of the odd and even channels in the section bearing calculation blocks. And a bearing selector for selecting one of the section beam bearings of the adjacent beam section bearing, the odd or even channel according to the width section bearing calculating section, and the output signal of the cross amplitude section bearing calculating section. And a bearing information calculating unit for outputting bearing data by adding the sector bearings in the sector calculating unit.

Hereinafter, the present invention will be described in detail with reference to the drawings.

6 is a block diagram of an apparatus for an embodiment of the present invention, as shown therein, wherein the video signals of the odd and even channels ( To Channel-based operation block 610 that measures the maximum value and difference maximum value for each channel by digital conversion, and inputs the maximum value of the odd and even channels in the maximum value calculation block 610 for each channel. Non-linearity of the antenna and RF / IF with respect to the output signal of the maximum value calculation block 610 for each channel with reference to the calculated sector calculator 620 and the operating frequency and the sector value of the sector calculator 620. A channel compensation block 630 for compensating the signal and an output signal of the channel compensation block 630, and an amplitude difference calculation block 640 for calculating the amplitude difference of the adjacent beam, the amplitude difference of the odd channel, and the amplitude difference of the even channel. And an interval orientation calculation block for calculating an operating frequency and an adjacent beam section orientation and a section orientation of an odd and even channel based on the operating frequency and the sector in the sector calculating section 620 by inputting the output signal of the amplitude difference calculating block 640 ( 650) and this section bearing calculation block 650 Compares the section orientations of the odd and even channels with the sector orientations of the sector calculator 620 to obtain the amplitude difference for each channel, and compares the amplitude difference for each channel with each other to give weight to a specific sector with stable detection accuracy. The cross amplitude amplitude direction calculation unit 660 for calculating the direction of the synthesized amplitude section by means of the cross amplitude range direction calculation unit 660, and the adjacent beam interval direction in the edge direction calculation block 650 according to the output signal of the cross amplitude amplitude direction direction calculation unit 660; An orientation selection unit 670 for selecting one of the section orientations of the odd and even channels, and an orientation for outputting the orientation data by adding the sector orientation in the sector calculating unit 620 to the selection orientation in the orientation selection unit 670; It consists of the information calculation part 680.

The maximum value calculation block 610 for each channel includes four odd channel signals ( , , , ) And an odd channel calculator 611 for calculating the maximum value and the difference maximum value after digital conversion. , , , ) Is converted into an even channel calculator 612 that calculates the maximum value and the difference maximum value after digital conversion.

The channel compensation block 630 includes a first odd channel compensator 631 for compensating for nonlinearity with respect to the maximum value of the odd channel, and a second odd channel compensator for compensating for nonlinearity with respect to a difference maximum value of the odd channel. 632, a first even channel compensator 633 for compensating for nonlinearity with respect to the maximum value of the even channel, and a second even channel compensator for compensating for nonlinearity with respect to a difference maximum value of the even channel. It consists of.

The amplitude difference calculation block 640 may include a first amplitude difference calculation unit 641 that obtains an amplitude difference between adjacent beams by inputting a compensated maximum value of an odd and even channel in the channel compensation block 630, and the channel compensation block. A second amplitude difference calculation unit 642 for obtaining an amplitude difference of the odd channel by inputting the compensated maximum value and the difference maximum value of the odd channel at 630, and the compensated value of the even channel in the channel compensation block 630; The third amplitude difference calculating unit 643 obtains the amplitude difference of the even channel by inputting the maximum value and the difference maximum value.

The section orientation calculation block 650 is a first section orientation calculator 651 that calculates a section orientation of an adjacent beam amplitude difference in the amplitude difference calculation block 640 by inputting a operating frequency and a sector in the sector calculator 620. And a second interval azimuth calculating unit 652 for calculating a section orientation of the amplitude difference of the odd channel in the amplitude difference calculating block 640 by inputting the operating frequency and the sector in the sector calculating unit 620, and the operating frequency. And a third section azimuth calculating section 653 that calculates a section orientation for the amplitude difference of the even channel in the amplitude difference calculating block 640 by inputting the sector in the sector calculating section 620.

Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

Video signals received and detected by eight antennas ( To ) Is input to the channel-specific operation block 610, the odd channel calculator 611 receives the signal of the odd channel ( , , , ) Is converted into a digital signal by pairing each of the two signals, and then the maximum value and the difference maximum value of the odd channel are measured, and the even channel calculator 612 measures the even channel signal ( , , , ) Is converted into a digital signal by pairing two signals, and the maximum and difference maximum values of the even channel are measured.

In this case, the sector calculator 620 calculates a sector value by inputting the maximum value of the odd channel and the maximum value of the even channel measured by the channel-specific operation block 610.

Accordingly, the channel compensation block 630 refers to the antenna for the maximum value and difference maximum value of the odd and even channels in the maximum value calculation block 610 for each channel by referring to the operating frequency and the sector value of the sector calculator 620. And compensating for each channel nonlinearity of the RF / IF. The first odd channel compensation unit 631 compensates for the nonlinearity with respect to the maximum value of the odd channel, and the second odd channel compensator 632 maximizes the difference between the odd channels. Compensation for nonlinearity with respect to the value, and the first even channel compensation unit 633 compensates for the nonlinearity with respect to the maximum value of the even channel, and the second even channel compensation unit 634 with nonlinearity with respect to the difference maximum value of the even channel. To compensate.

In this case, the amplitude difference calculation block 640 calculates the amplitude difference of the adjacent beam, the amplitude difference of the odd channel, and the even channel by using the output signal from the channel compensation block 630, and the first amplitude difference calculating unit ( In 641, the amplitude difference of the adjacent beam is obtained by inputting the compensated maximum value of the odd and even channels in the channel compensation block 630, and the second channel in the channel compensation block 630 in the second amplitude difference calculator 642. The amplitude difference of the odd channel is obtained by inputting the compensated maximum value and the difference maximum value of the input signal, and the compensated maximum value and difference maximum value of the even channel of the channel compensation block 630 are input by the third amplitude difference calculator 643. The amplitude difference of the even channel is obtained by.

Accordingly, the section orientation calculation block 650 inputs the output signal of the amplitude difference calculation block 640 to adjust the operating frequency and the section beam direction of the adjacent beam section and the section orientation of the odd and even channels for each sector in the sector calculating section 620. The first section orientation calculation unit 651 calculates the section orientation of the adjacent beam amplitude difference in the amplitude difference calculation block 640 by inputting the operating frequency and the sector in the sector calculation section 620, and the second section orientation. The calculation section 652 calculates the section orientation of the amplitude difference of the odd channel in the amplitude difference calculation block 640 by inputting the operating frequency and the sector in the sector calculation section 620, and the third section orientation calculation section 653. The interval orientation of the amplitude difference of the even channel in the amplitude difference calculation block 640 is calculated by inputting an operating frequency and a sector in the sector calculator 620.

In this case, the cross amplitude section direction calculation unit 660 selects a specific sector by referring to the operating frequency and the sector in the sector calculating unit 620 by inputting the section orientations of the odd and even channels in the section direction calculation block 650. The orientation of the synthesized amplitude section is calculated by weighting the selected specific sector.

Accordingly, the azimuth selector 670 uses the azimuth of the synthesized amplitude section in the cross amplitude section direction calculation unit 660 as a control signal to determine the adjacent beam section direction, the odd and even channel of the section direction calculation block 650. The corresponding bearing is selected among the section bearings and output to the bearing information calculating unit 680.

Accordingly, the azimuth information calculator 680 outputs azimuth data by adding the azimuth in the azimuth selection block 670 and a sector azimuth in the sector calculator 620.

In addition, the process of weighting the cross amplitude section direction calculation unit 660 using two pairs of amplitude differences and two azimuths is as follows.

On the other hand, amplitude difference gradient distribution and azimuth measurement error distribution in the embodiment of the present invention, which is weighted to selectively utilize only the portions having excellent detection accuracy in the comparison detection (Adjacent Comparison) inspection apparatus as shown in FIG. 3. 4 is an exemplary view of FIGS. 4 and 5.

First, Figure 4 shows eight probe antennas. 45 rounded isometric With 90 This is an exemplary diagram showing the distribution of the amplitude difference slope and the detection error measurement of the pair.

This is to improve the accuracy of the section where the boresight of the antenna is located, which is the section where the accuracy of detection is significantly lowered in the neighbor comparison. We show how to use the pairs. Pair)) and the section where the boresight of the antenna is located is 90 This technique is used to increase the weight of a pair.

Therefore, in the case of the incident signal 1 in FIG. Rather than using amplitude differences between (antenna 2,3) pairs, 90 By actively using the (antenna 1, 3) pair, it is possible to compensate for the shortcomings of the general proximity comparison method of FIG.

Likewise, in the case of incident signal 2, 45 90 rather than (antenna2,3) pairs Excellent weighting accuracy can be obtained by giving greater weight to the (antenna 1,3) pair.

That is, the method as shown in FIG. 4 is larger than the intersection of antennas 2 and 3 by 90. If we use (antenna 2,4) pair and it is smaller than intersection point, it is 90 Amplitude difference of (antenna1,3) pair is 45 It is used for the part where the detection error of (antenna 2,3) pair is big.

5 is a concept similar to that of FIG. 90 in isometric arrangement Even Pair and 90 (Odd Pair) This is an illustration showing the distribution of the amplitude difference slope and the orientation measurement error of the pair.

Where one side 90 As the amplitude difference between the pairs increases, the other 90 You can see that the amplitude difference of the pair gets smaller, 90 If the azimuth error of the (antenna1,3) pair increases, 90 (Antenna 2,4) Pair orientation error is reduced and 90 If the azimuth error of (antenna1,3) pair is small, 90 The orientation error of the (antenna 2,4) pair becomes large.

Therefore, the accuracy of the screening can be improved by giving a large weight to the parts having good staggered amplitude differences and azimuth errors.

That is, the direction detection of the incident signal 1 in Figure 5 is 90 Mainly using (antenna 1,3) pairs and incident signal 2 is 90 By mainly using (antenna 2,4) pairs, it is possible to improve the accuracy of detection by supplementing the disadvantages of the general adjacent comparison detection method as shown in FIG.

In conclusion, FIGS. 4 and 5 can considerably improve the accuracy of the adjacent comparative amplitude detection by calculating two orientations using two pairs of amplitude differences and assigning a high weight to a stable amplitude portion, that is, a portion having a small orientation error. have.

As described in detail above, the present invention uses two pairs of amplitude differences to give a high weight to the parts having excellent detection accuracy, thereby reducing the detection accuracy due to nonlinearity due to distortion in the interval sector or the sector. It is possible to stably obtain the orientation information of all the zones in the detection orientation, thereby improving the detection accuracy.

Claims (3)

In the direction detection apparatus of the amplitude comparison method for detecting the direction of arrival of the received signal by arranging a plurality of antennas in a circular shape, the video signal detected from the plurality of received signals ( To A channel operation block that calculates a sector value by inputting the maximum value of the odd and even channels in the maximum value calculation block for each channel by digital conversion A channel compensation block for compensating for nonlinearity with respect to the output signal of the channel-specific operation block by referring to the sector value in the sector calculator, and the amplitude difference of the adjacent beam and the amplitude of the odd channel by inputting the output signal of the channel compensation block. A section for calculating the adjacent beam section orientation and the section orientation of the odd and even channel for each sector in the sector calculator by inputting an amplitude difference calculation block for calculating amplitude differences between the difference and even channels and an output signal of the amplitude difference calculation block. The amplitude difference for each channel is calculated by comparing the azimuth calculation block and the azimuth and even channel orientations in this section azimuth calculation block with the sector orientations in the sector calculating section. A cross amplitude section direction calculation section for calculating a direction of the synthesized amplitude section by comparing the amplitude differences for each channel to each other and weighting a sector having stable detection accuracy, and the section according to the output signal of the cross amplitude section direction calculation section. Azimuth data is output by adding an azimuth selector for selecting a corresponding azimuth among adjacent beam section azimuths in the azimuth calculation block and a section orientation of the odd and even channels, and a sector azimuth in the sector calculating unit to a selected azimuth in this azimuth selector. Directional detection device of the conformal circular array structure, characterized in that consisting of a bearing information calculation unit. The method of claim 1, wherein the cross amplitude section direction calculation unit is a plurality of antennas 45 45 rounded isometric With 90 In the section where the accuracy of detection is deteriorated by finding the amplitude difference of the pair, the adjacent 90 Directional detection device of the conformal circular array structure, characterized in that to increase the weight of the pair. The method of claim 1, wherein the cross amplitude section direction calculation unit is a plurality of antennas 45 90 in isometric round arrangement Odd Pair and 90 Find the amplitude difference and azimuth error of the pair, and the amplitude difference and azimuth error are good. Directional detection device of the conformal circular array structure, characterized in that to increase the weight of the pair.