阅读说明：本技术 一种主被动复合射频探测器挂飞试验装置 (Active and passive composite radio frequency detector hanging test device ) 是由 胡昌华 钟都都 杨剑 张伟科 夏巍巍 衣彬 方晓 于 2021-09-28 设计创作，主要内容包括：本发明公开了一种主被动复合射频探测器挂飞试验装置,由圆形状的吸波材料和偏转安装支架组成,吸波材料粘贴在飞机的机头安装面,用于吸收入射到飞机机头安装面的电磁波；偏转安装支架为底部安装面、中间支撑筒和偏转安装面组成一体的结构,底部安装面通过紧固装置与所述飞机机头安装面固定；中间支撑筒位于吸波材料中央；偏转安装面相对于所述飞机的机头安装面存在一个先俯仰往下15～45度,然后方位往右15～45度的偏转；偏转安装面通过一个引导头与主被动复合射频探测器的底部固定。可以避免在低频段飞机机腹或机翼电磁反射对射频探测器被动测向的影响,并扩大了试验验证的射频探测器测向跟踪视场范围及试验验证的主动探测的入射余角。(The invention discloses an active and passive composite radio frequency detector hanging test device which comprises a circular wave-absorbing material and a deflection mounting bracket, wherein the wave-absorbing material is adhered to a machine head mounting surface of an airplane and used for absorbing electromagnetic waves incident to the machine head mounting surface of the airplane; the deflection mounting bracket is of an integrated structure consisting of a bottom mounting surface, a middle supporting cylinder and a deflection mounting surface, and the bottom mounting surface is fixed with the aircraft nose mounting surface through a fastening device; the middle supporting cylinder is positioned in the center of the wave-absorbing material; the deflection mounting surface deflects 15-45 degrees downwards in a pitching mode and 15-45 degrees to the right in the direction relative to the aircraft nose mounting surface of the aircraft; the deflection installation surface is fixed with the bottom of the active and passive composite radio frequency detector through a guide head. The influence of electromagnetic reflection of the ventral or the wing of the low-frequency plane on the passive direction finding of the radio frequency detector can be avoided, and the direction finding tracking field range of the radio frequency detector verified by the test and the incidence complementary angle of the active detection verified by the test are enlarged.)

1. The utility model provides an active passive compound radio frequency detector hangs and flies testing arrangement which characterized in that comprises absorbing material (1) and the installing support (2) that deflect of circular form, wherein:

the wave-absorbing material (1) is adhered to the aircraft nose installation surface of the aircraft and is used for absorbing electromagnetic waves incident to the aircraft nose installation surface;

the deflection mounting bracket (2) is of an integrated structure consisting of a bottom mounting surface (21), a middle supporting cylinder (22) and a deflection mounting surface (23), wherein:

the bottom mounting surface (21) is fixed with the aircraft nose mounting surface through a fastening device; the middle supporting cylinder (22) is positioned in the center of the wave-absorbing material (1);

the deflection mounting surface (23) deflects downwards by 15-45 degrees in a pitching mode and then rightwards by 15-45 degrees in an azimuth mode relative to the aircraft nose mounting surface;

the deflection mounting surface (23) is fixed with the bottom of the active and passive composite radio frequency detector through a guide head (3).

2. The active-passive composite radio frequency detector hanging test device according to claim 1, wherein the diameter of the wave-absorbing material (1) is 2.5m, the wave-absorbing material is formed by splicing a plurality of wave-absorbing materials, and the thickness of the wave-absorbing material is 2 cm-20 cm.

3. The active-passive composite radio frequency detector airborne test device according to claim 1 or 2, wherein the thickness of the wave-absorbing material (1) is 15 cm.

4. The active-passive composite radio frequency detector airborne test device according to claim 1, wherein the deflection mounting bracket (2) is made of a metal material.

Technical Field

The invention belongs to a radio frequency detector test technology in the field of applied electronics and information, and particularly relates to an active and passive composite radio frequency detector hanging test device.

Background

Compared with a common ground environment test and a ground performance test, the radio frequency detector hanging test is closer to a real use condition and is a necessary link for the performance test of the radio frequency detector. Taking the active and passive composite radio frequency detector as an example, the hang-off test can perform test verification on the active and passive composite radio frequency detector in the following aspects:

1) verifying the interception, direction finding and tracking capabilities of a passive part of the radio frequency detector on a radio frequency radiation source target in a flight state;

2) and verifying the interception, direction finding and tracking capabilities of the active part of the radio frequency detector on the target in the flight state.

In order to verify the passive target tracking capability and the active target tracking capability of the radio frequency detector in the flight test state more accurately, the radio frequency detector is generally hung under the belly of the airplane or under the two wings of the airplane by a hanging rack. For the active radio frequency detector, the influence of the belly or the wing of the airplane is small due to the high working frequency range, and the influence on the active direction finding and the angle tracking can be ignored. However, for a composite radio frequency detector including a passive part, the passive working frequency band is wide and the frequency band is low, so that the belly or the wing of the airplane has large influence, and the influence on passive direction finding cannot be ignored. In order to verify the direction-finding and tracking capabilities of the passive radio frequency detector or the passive part of the composite radio frequency detector through the hang-off test, usually, only a high frequency band in a passive direction-finding frequency band can be selected for verification, the direction-finding and tracking capabilities of a low frequency band cannot be verified, and the test is not sufficient.

Disclosure of Invention

Aiming at the technical problem of low-frequency-band flight adaptability of the active and passive composite radio frequency detector in the prior art, the invention aims to provide an active and passive composite radio frequency detector flight test device, and the active and passive composite radio frequency detector can be arranged at the aircraft nose position through the device.

In order to realize the task, the invention adopts the following technical solution:

the utility model provides an active passive compound radio frequency detector hangs and flies test device which characterized in that comprises the absorbing material of circular form and deflection installing support, wherein:

the wave-absorbing material is adhered to the aircraft nose installation surface of the aircraft and is used for absorbing electromagnetic waves incident to the aircraft nose installation surface;

the deflection mounting bracket is a structure formed by a bottom mounting surface, a middle supporting cylinder and a deflection mounting surface into a whole, wherein:

the bottom mounting surface is fixed with the aircraft nose mounting surface through a fastening device; the middle supporting cylinder is positioned in the center of the wave-absorbing material;

the deflection mounting surface deflects 15-45 degrees downwards in a pitching mode and 15-45 degrees to the right in a direction relative to the aircraft nose mounting surface;

the deflection installation surface is fixed with the bottom of the active and passive composite radio frequency detector through a guide head.

According to the invention, the diameter of the wave-absorbing material is 2.5m, the wave-absorbing material is formed by splicing a plurality of wave-absorbing materials, and the thickness of the wave-absorbing material is 2 cm-20 cm.

The active and passive composite radio frequency detector hang-off test device can avoid the influence of electromagnetic reflection of the belly or the wing of a low-frequency-band airplane on the passive direction finding of the radio frequency detector, solves the adaptability problem of the low-frequency-band passive direction finding and tracking, enlarges the direction finding and tracking view field range (including the active and passive working modes) of the radio frequency detector which can be tested and verified by the device, and enlarges the incidence complementary angle which can be tested and verified by the active working mode.

Drawings

FIG. 1 is a three-dimensional structure diagram of an active and passive composite RF detector airborne test device of the present invention;

FIG. 2 is a perspective view of a deflector mount bracket product;

FIG. 3 is a side view of the active and passive composite RF detector airborne test apparatus of the present invention installed in an aircraft;

FIG. 4 is a coordinate system definition;

FIG. 5 is a chart of a hangoff test;

FIG. 6 is a comparison of a low-frequency range hang-off test angle and a theoretical angle;

FIG. 7 is a comparison of target theoretical angles (range of fields of view that can be verified) for an undeflected mount versus a deflected mount;

the present invention will be described in further detail with reference to the accompanying drawings and examples.

Detailed Description

As shown in fig. 1, the active and passive composite radio frequency detector hanging flight test device provided by the embodiment is composed of a wave-absorbing material 1 and a deflection mounting bracket 2, wherein the wave-absorbing material 1 is formed by splicing a plurality of wave-absorbing materials, is round in appearance and 2.5m in diameter, completely covers the mounting surface of an aircraft nose, the thickness of the wave-absorbing material 1 is 2-20 cm, and the larger the thickness of the wave-absorbing material 1 is, the lower the adapted frequency band is.

In the embodiment, the thickness of the wave-absorbing material 1 is 15cm, which is equivalent to the wavelength of 2GHz electromagnetic waves. Most of electromagnetic energy incident to the rear of the radio frequency detector is absorbed by the wave absorbing material 1, and the reflected energy can be ignored, so that the electromagnetic environment of the active and passive composite radio frequency detector in a hanging state is consistent with the electromagnetic environment tested in a darkroom, and the direction finding precision of the active and passive composite radio frequency detector can be ensured. On the other hand, the wave-absorbing material 1 is arranged inside the antenna housing 5 of the aircraft nose 4, so that the pneumatic performance and the safety performance of the aircraft are not influenced. If the wave-absorbing material 1 is arranged on the belly or the wing, the aerodynamics of the airplane can be affected.

As shown in fig. 2, the yaw-mounting bracket 2 is made of a metal material and is an integrated structure composed of a bottom mounting surface 21, an intermediate support cylinder 22, and a yaw mounting surface 23.

The middle supporting cylinder 22 is located in the center of the wave absorbing material 1, the bottom mounting surface 21 is fixed with a mounting surface of the aircraft nose 4 through a fastening device, and the deflection mounting surface 23 deflects downwards by 15-45 degrees in a pitching mode and then deflects rightwards by 15-45 degrees in a direction relative to the mounting surface of the aircraft nose. The angle definitions of azimuth and pitch are shown in fig. 4.

As shown in fig. 3, the radio frequency detector is installed in the antenna housing 5 of the aircraft nose 4 through the active and passive composite radio frequency detector hang-off test device of this embodiment, the wave-absorbing material 1 is pasted on one side of the installation surface of the aircraft nose 4 in the antenna housing 5, and absorbs the electromagnetic wave incident to the installation surface of the aircraft nose 4 in the antenna housing 5, so as to reduce electromagnetic reflection, avoid the electromagnetic environment influence on the active and passive composite radio frequency detector, and enable the active and passive composite radio frequency detector to adapt to a low-frequency-band hang-off test.

The deflecting installation surface 23 is fixed with the bottom of the active and passive composite radio frequency detector through a guide head 3. Wherein the guide head 3 is used for easily adjusting the installation position of the active and passive composite radio frequency detector.

When the airplane is in a horizontal state, the direction of the airplane nose 4 is taken as a reference, the active and passive composite radio frequency detector points at-40 to-20 degrees of pitch and-40 to-20 degrees of azimuth, and the angle coordinates of the azimuth angle and the pitch angle are defined as shown in figure 4. The polarity is defined as negative when the pitch is downward and negative when the azimuth is rightward, and the radio frequency detector points to the lower right through the deflection mounting bracket 2.

Assuming that the airplane flies according to the flight path shown in fig. 5, the flying height is 8000m (high altitude), the flying speed is 200m/s, the target ground is at the point T, the altitude is 800m, the airplane enters the flight path from the point A, the passive part of the radio frequency detector starts to work from the point B, the radiation signal of the ground target radiation source is received, the target radiation source is passively detected, the active part of the radio frequency detector starts to work from the point C, the electromagnetic wave is emitted to irradiate the ground target, and the target is detected. At point D the aircraft begins flying to the right and returns back off. The aircraft flies horizontally along a predetermined route, and makes a plurality of round trips.

According to the active and passive composite radio frequency detector hang-off test device provided by the embodiment, the active and passive composite radio frequency detector can be arranged at the aircraft nose part through the deflection mounting bracket 2, and electromagnetic waves irradiated to the aircraft nose are absorbed by the wave-absorbing material 1 to reduce the influence of the aircraft on the passive low-frequency direction finding of the active and passive composite radio frequency detector.

Fig. 6 shows a comparison between the passive direction finding test result of the active and passive composite radio frequency detector in the low frequency band and the theoretical angle in the actual flight test, and it can be seen from fig. 6 that the test result is well matched with the theoretical result. After multiple times of ground verification, if the wave-absorbing material of the device is removed, the direction-finding precision is greatly deteriorated.

Through the active and passive composite radio frequency detector hang-off test device of the embodiment, the active and passive composite radio frequency detector is pointed to the right lower side with a deflection angle of 30 degrees in the pitching direction and a direction of 30 degrees in the right direction. In general, the range of the direction-finding field of view (whether active or passive) of the active and passive composite rf detector is limited, and for example, the azimuth angle is α, the pitch angle is β, α is ± 30 degrees, and β is ± 30 degrees. And the active and passive composite radio frequency detector cannot work when the azimuth angle or the pitch angle exceeds respective ranges. Through the active and passive composite radio frequency detector hang-off test device in the embodiment, in 0-7275 frame data (as shown in fig. 7), the target is in the field range of the active and passive composite radio frequency detector, and the active and passive composite radio frequency detector can normally direction and track the target. The azimuth direction-finding field range which can be verified by tests covers-3.9 to +27.2 degrees, and the pitch direction-finding field range which can be verified by tests covers-30.0 to +12.9 degrees. If a conventional hang-off test device is adopted, the active and passive composite radio frequency detector is normally installed (does not deflect), the azimuth view field range which can be verified through tests only covers-15.0 to-5.5 degrees, and the pitching direction-finding view field range which can be verified only covers-30.0 to-15.8 degrees (corresponding to 1 to 4142 frame data on figure 7). The range of the direction-finding field of view is small under the condition of non-deflection installation, because the azimuth angle exceeds alpha or the pitch angle exceeds beta, the detector cannot work. By the aid of the active and passive composite radio frequency detector hanging-flying test device, the active and passive composite radio frequency detector is deflected in the pointing direction, and the direction-finding tracking field range of the active and passive composite radio frequency detector which can be verified through tests is enlarged.

For the active and passive composite active radio frequency detector, an important assessment index is the ground incidence complementary angle. The grazing incidence complementary angle is defined as the angle between the beam pointing direction and the horizontal plane. Under the conventional condition, if the active and passive composite radio frequency detector points to the horizontal, the range of a pitching direction-finding field of view does not exceed beta, and the ground incidence complementary angle does not exceed the maximum value of beta in the horizontal hanging state. If a large complementary angle of incidence needs to be verified, the airplane needs to fly in a 'dive' mode, the challenge to the airplane and personnel is large, and a large risk exists in safety. Through the active and passive composite radio frequency detector hang-off test device of the embodiment, even if an airplane flies horizontally, the beam direction of the active and passive composite radio frequency detector deflects downwards by a certain angle due to the device, and the maximum ground incident complementary angle capable of being verified by a test is effectively enlarged by combining the field range of the active and passive composite radio frequency detector, so that the implementation of a hang-off test is greatly facilitated.

Through the verification, the active and passive composite radio frequency detector hang-off test device provided by the embodiment can improve the adaptability of the low-frequency-band active and passive composite radio frequency detector passive direction finding test verification, enlarge the direction finding tracking view field range of the active and passive composite radio frequency detector which can be tested and verified, and enlarge the maximum ground incidence complementary angle which can be tested and verified.