JP2000174533A - Aiming device for radar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately perform aiming control by providing a level correcting means for received signals and controlling the direction of an antenna to detect the peak point of the level corrected received signal. SOLUTION: At the center of front part of a vehicle 1, a supporting member 2 is installed so as to be vertically and laterally inclined while relatively and laterally juxtaposing plural antennas with prescribed directivity in advance. A correction processing part 5 is provided for correcting the level of received signal of a channel corresponding to the central antenna so as to sharpen the level characteristics of the received signal. A beam is emitted from the specified antenna among the plural antennas juxtaposed on the supporting member 2. Then, aiming is performed by controlling the direction of the supporting member 2 through a control mechanism 3 while watching the level of the received signal through a meter 4 so that the level of the received signal due to a reflected wave from a target 6 can become a peak.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar aiming device for adjusting the direction of an antenna so that a beam emitted from the antenna is directed in a predetermined direction.

[0002]

2. Description of the Related Art Conventionally, in an aiming device of this type of radar, an aiming target is provided in a predetermined direction, and a reflected wave from the target when a beam is emitted from an antenna is received, and the aiming is performed. The direction of the antenna is adjusted so that the peak point of the received signal is obtained.

[0003]

The problem to be solved is that if the detection accuracy of the peak point of the received signal due to the reflected wave from the target when the beam is emitted from the antenna is poor, the accuracy of the radar aiming adjustment will be poor. It is to be reduced.

[0004] Particularly, in a radar adopting a multi-channel system in which a plurality of antennas are provided with predetermined directivities in order to widen the radar monitoring area,
Aiming adjustment needs to be performed while shifting the position of the target so that the direction of each antenna is in a predetermined direction. However, there is a large error, and it is difficult to perform the adjustment with high accuracy.

[0005]

SUMMARY OF THE INVENTION The present invention is a radar aiming apparatus for providing an aiming target and adjusting the direction of the antenna so that a beam emitted from the antenna irradiates the target. In order to perform the adjustment easily and accurately, a level correction means for the received signal is provided, and the direction of the antenna is adjusted so that the peak point of the level-corrected received signal is detected. ing.

Further, in the present invention, in a multi-channel radar having a plurality of antennas, in order to easily and accurately perform the aiming adjustment, each antenna has a relatively predetermined directivity in advance. Attach it to one support member and adjust the direction of the support member while controlling the direction of the support member while observing the state of the reflected wave from the aiming target when a beam is emitted from a specific antenna among the plurality of antennas. And do it.

Further, in the present invention, in a multi-channel radar having a plurality of antennas, in order to easily and accurately perform the aiming adjustment, each antenna has a predetermined relative directivity in advance. Attaching to one support member and providing means for correcting the output level of the beam emitted from each of the plurality of antennas, and emitting the beam whose output level has been corrected from each antenna, the Aiming is performed collectively by adjusting the direction of the support member while observing the state of the reflected wave.

[0008]

1 and 2 show a case in which a multi-channel radar is mounted on a vehicle so that the distance between the vehicle and a vehicle ahead can be measured and the relative speed can be measured, and an obstacle ahead can be detected. Is shown. Here, a support member 2 in which a plurality of antennas (not shown in particular) are arranged side by side in the front center of the vehicle 1 with a relatively predetermined directivity in advance.
Is installed so that it can be tilted up and down and left and right. The support member 2 is provided with an adjusting mechanism 3 for performing the positioning.

FIG. 3 shows a specific configuration example of a radar employing a multi-channel system. Here, a plurality of FM-modulated beams can be transmitted forward from a plurality of antennas ANT1 to ANTn arranged in parallel.
The signals obtained by mixing the transmission signals and the reception signals of the antennas ANT1 to ANTn by the mixers 101 to 10n are sequentially read through the multiplexer 11 and converted into digital signals by the A / D converter 12, The FET processing unit 13 performs fast Fourier transform (FET) processing. Then, the peak detector 14
In the above, a peak level data is detected from the data of each channel system which has been spectrum-analyzed by the FET processing, and based on the detection result, the recognition processing unit 15 composed of a computer covers the data with a plurality of antennas ANT1 to ANTn. It is configured to perform recognition processing of a target in a monitoring area that is located within the monitoring area. In the figure, 7 is a transmission signal generator, 8 is a power divider, 91 to 9n
Is a circulator.

According to the present invention, as shown in FIGS. 1 and 2, an aiming target 6 is provided in front of the vehicle 1 and is provided side by side with the support member 2. Aiming is performed by adjusting the direction of the support member 2 so that the level of a received signal due to a reflected wave from the target 6 when a beam is emitted from a specific antenna among the plurality of antennas becomes a peak. I have. FIG. 1 shows a state before the aiming adjustment, and FIG. 2 shows a state after the aiming adjustment.

At this time, after the target 6 is provided at the front central portion of the vehicle 1, a beam is emitted from the central antenna among the plurality of antennas arranged in parallel on the support member 2, and the central antenna If the direction of the support member 2 is adjusted so that the level of the received signal due to the above becomes a peak, the aiming can be performed optimally.

More specifically, the operator tilts the support member 2 vertically and horizontally by the adjusting mechanism 3 while checking the level of the received signal with the meter 4 (see FIGS. 1 and 2).
The support member 2 is positioned at a position where the level reaches a peak.

Instead of manually adjusting the aiming, the actuator for adjusting the adjusting mechanism 3 is driven under the control of the computer so that the level of the received signal becomes a peak, and the positioning of the support member 2 is determined. It is easily possible to perform the processing automatically.

FIG. 4 shows channels CH1 to CH5 corresponding to each antenna when five antennas are arranged in parallel on the support member 2.
The level characteristic of the received signal of CH5 is shown. W indicates left and right monitoring areas by the five antennas.

FIG. 5 shows a channel C corresponding to the central one of the five antennas arranged side by side on the support member 2.
The level characteristic of the received signal of H3 is shown, and aiming adjustment is performed so that the direction of the peak point P is directed to the target 6.

Further, in the present invention, as shown in FIG. 6, a center antenna is provided so that the level characteristic of the received signal can be corrected to be steep so that the peak point P can be easily detected. A correction processing unit 5 for correcting the level of the received signal of the corresponding channel CH3 to a predetermined value is provided.

As a specific level correction, a correction value for an input level is set in advance. At that time, for example, 0 dB is directly changed to 0 dB, -2 dB is changed to -5 dB, -5 dB is changed to -8 dB, -10 dB is changed to -10 dB, -20 dB is changed to -15 dB, and -30 dB is changed to -30 dB.
The dB is corrected to -20 dB, and the -40 dB is corrected to -25 dB.

FIG. 7 shows characteristics when the level characteristics of the received signal of the channel CH3 shown in FIG. 5 are corrected.

Therefore, when the aiming adjustment is performed so that the level of the reception signal of the channel CH3 becomes a peak, that is, the center of the beam emitted from the central antenna coincides with the direction of the target 6, the level of the reception signal is adjusted. When the change is simple and gradual as shown in FIG. 5, it is difficult to find the peak point P. However, when the change in the level of the received signal is steep as shown in FIG. You will be able to find it easily.

The method of detecting the peak point by performing the level correction of the received signal is not limited to the multi-channel method, and is not particularly shown in the case of a one-channel type radar. If the signal level correction processing unit is provided and the direction of the antenna is adjusted so that the peak point of the level-corrected received signal is detected, the aiming adjustment can be easily and accurately performed. become.

Further, according to the present invention, a means for adjusting the output level of the beam emitted from each of the plurality of antennas is provided, and the beam whose output level is adjusted is emitted from each of the antennas. The direction of the support member 3 is adjusted while observing the state of the reflected wave from.

More specifically, when five antennas are arranged side by side on the support member 2, the channel CH corresponding to each antenna is
The output levels of 1 to CH5 are adjusted, for example, as follows.

For example, the output level of channel CH1 is set as a reference level, the output level of channel CH2 is adjusted to be 20% higher than the reference level, the output level of channel CH3 is adjusted to be 50% higher than the reference level, and channel CH is adjusted.
4 is adjusted to be 20% higher than the reference level, and the output level of channel CH5 is set as the reference level.

Actually, for example, in the radar configuration shown in FIG. 3, under the control of a computer, the transmission signal generator 7
Antennas ANT1 to ANTn by time-division driving of
In order to sequentially emit beams from the transmission signal generator 7, the levels of the transmission signals sequentially generated from the transmission signal generator 7 are sequentially adjusted.

FIG. 8 shows the level characteristics of the transmission signals of the channels CH1 to CH5 whose output levels have been adjusted at that time.

As described above, by adjusting the output level of the beam emitted from each of the plurality of antennas arranged in parallel on the support member 2 so that the output level of the center channel CH3 is maximized, the left and right monitoring is performed. Aiming adjustment can be optimally performed while keeping the area W wide.

[0027]

As described above, according to the present invention, there is provided a radar aiming apparatus for providing an aiming target and adjusting the direction of the antenna so that a beam emitted from the antenna irradiates the target. Since the signal level correcting means is provided and the direction of the antenna is adjusted so that the peak point of the level-corrected received signal is detected, the aiming adjustment can be performed easily and accurately. There are advantages.

According to the present invention, in particular, in a multi-channel radar having a plurality of antennas, each of the antennas has a relatively predetermined directivity.
Attach to one support member, and adjust the direction of the support member while checking the state of the reflected wave from the aiming target when a beam is emitted from a specific antenna among the plurality of antennas to perform aiming collectively. This is advantageous in that aiming adjustment can be easily and accurately performed.

Further, according to the present invention, in a multi-channel radar having a plurality of antennas,
Each antenna was previously attached to one supporting member with relatively predetermined directivity, and means for adjusting the output levels of beams emitted from the plurality of antennas were provided, and the output levels from the respective antennas were adjusted. By firing the beam, the direction of the support member is adjusted while performing the aiming at a time while checking the state of the reflected wave from the aiming target. It has the advantage that it can be done.

[Brief description of the drawings]

FIG. 1 is a simplified configuration diagram when a radar aiming device according to an embodiment of the present invention is mounted on a vehicle.

FIG. 2 is a diagram showing a state after aiming adjustment in the embodiment.

FIG. 3 is a block diagram illustrating a configuration example of a radar employing a multi-channel system.

FIG. 4 is a diagram showing level characteristics of received signals of respective channels corresponding to five antennas arranged in parallel on a support member.

FIG. 5 is a diagram showing level characteristics of a received signal of a channel corresponding to a central antenna among five antennas arranged in parallel on a support member.

FIG. 6 is a simplified configuration diagram when a radar aiming device according to another embodiment of the present invention is mounted on a vehicle.

FIG. 7 is a diagram showing characteristics obtained by correcting the level of a received signal of a channel corresponding to the center antenna among the five antennas arranged side by side on the support member.

FIG. 8 is a diagram showing the level characteristics of the transmission signal of each channel whose output level has been adjusted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle 2 Support member 3 Adjustment mechanism 4 Meter 5 Correction processing part 6 Target for aiming

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01Q 25/04 G01S 13/93 Z F-term (Reference) 5J021 AA05 AA07 AA11 AB01 DA02 FA13 FA32 FA35 GA02 HA02 HA04 5J047 AA01 AA02 AB02 BF10 BF11 5J070 AB08 AD03 AH25 AH31 AH35 AK22

Claims (5)

[Claims] 1. A radar aiming device for providing an aiming target and adjusting the direction of the antenna so that a beam emitted from the antenna irradiates the target, the device including a level correcting means for a received signal. A radar aiming device wherein the direction of the antenna is adjusted so that the peak point of the level-corrected received signal is detected. 2. A radar aiming device for providing an aiming target and adjusting the direction of the antenna so that a beam emitted from the antenna irradiates the target, so as to cover a predetermined monitoring area. By mounting each antenna in a multi-channel type radar provided with a plurality of antennas to one support member with relatively predetermined directivity, and by emitting a beam from a specific antenna among the plurality of antennas, Aiming apparatus for a radar, wherein aiming is performed by adjusting the direction of the support member. 3. An aiming target is provided at the center of a predetermined monitoring area provided by a plurality of antennas, and when a beam is emitted from the central antenna among the plurality of antennas toward the target, a peak point of a received signal is reduced. 3. A radar aiming apparatus according to claim 2, wherein aiming is performed by adjusting the direction of the support member so as to obtain the aiming. 4. The radar aiming device according to claim 3, wherein the level of the received signal is corrected to detect a peak point. 5. A radar aiming device for providing an aiming target and adjusting the direction of the antenna so that a beam emitted from the antenna illuminates the target, covering a predetermined monitoring area. In a multi-channel radar provided with a plurality of antennas, each antenna is attached to one support member with relatively predetermined directivity, and means for adjusting output levels of beams respectively emitted from the plurality of antennas is provided. A radar aiming device, wherein a beam whose output level is adjusted is emitted from each antenna to adjust the direction of the support member to perform aiming.