Active deviation guiding device and method for air millimeter wave radar

Abstract

The invention discloses an active deviation guiding device and method for an air millimeter-wave radar, and the device comprises a receiving down-conversion module which is provided with a receiving antenna for receiving a millimeter-wave radar signal; the transmitting up-conversion module is provided with a transmitting antenna for transmitting a signal to a target airspace; wherein the millimeter wave radar signal is subjected to low noise amplification processing through the receiving down-conversion module, is subjected to frequency conversion to an intermediate frequency band, is subjected to power division into multiple paths, is subjected to filtering delay combination processing, is recovered to an initial wave band through the transmitting up-conversion module, is subjected to power amplification and is transmitted to a target airspace. The device can approach to real protected target echoes, then attracts the millimeter wave radar to lock and quickly protect a high-value target, and is simple in structure and low in implementation cost.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic countermeasures, and in particular relates to an active deflection device and method for an aerial millimeter-wave radar. Background Art

[0002] In modern warfare, high-value targets play a vital role due to their important strategic value. For example, radar constitutes an important link in reconnaissance, surveillance and early warning. The destruction and protection of high-value targets have also become the primary goals of both the attacker and the defender in modern high-tech warfare.

[0003] Active deflection is to deploy a certain number of active decoys near the protected target, so that the signal forwarded by the active decoys and the echo signal of the protected target enter the millimeter-wave radar seeker at the same time, forming angle deception interference to the millimeter-wave radar seeker, causing the attack weapon to explode in the area where the active decoys are located, thereby achieving the purpose of ensuring the safety of the target;

[0004] However, the current active deflection devices are costly, bulky, heavy, have poor maneuverability, are difficult to install, and complex to operate. The probability of protecting high-value targets is low, making it difficult to quickly and efficiently protect high-value targets. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide an active deflection device and method for airborne millimeter-wave radar, perform low-noise amplification processing on the received millimeter-wave radar signal, complete linear amplification of the received signal, and then convert it to an intermediate frequency band, perform power division and filtering processing on the intermediate frequency signal, and realize separate delay of each signal through the inherent delay of the filter, combine the multiple signals after the delay is completed, and then convert them back to the initial radio frequency band after up-conversion, and then feed them to the radar receiver through the transmitting antenna after power amplification, so as to approximate the multi-point echo characteristics of the real protected target, thereby attracting the millimeter-wave radar to lock, and quickly protect the high-value target, and the device has a simple structure and low implementation cost.

[0006] The object of the present invention is achieved through the following technical solutions:

[0007] An active deflection device for airborne millimeter-wave radar, comprising:

[0008] A receiving down-conversion module having a receiving antenna for receiving millimeter wave radar signals;

[0009] A transmit up-conversion module having a transmit antenna for transmitting a signal to a target airspace;

[0010] Among them, the millimeter wave radar signal is processed by the receiving down-conversion module for low noise amplification and frequency conversion to the intermediate frequency band, and then power-divided into multiple paths and filtered, delayed and combined. It is then restored to the initial band by the transmitting up-conversion module and power amplified before being transmitted to the target airspace.

[0011] In one embodiment, the receiving down-conversion module further includes a low noise amplifier, a power divider and a filter, and the transmitting up-conversion module further includes an amplifier and a filter.

[0012] In one embodiment, the receiving down-conversion module and the transmitting up-conversion module both have an antenna cover, and the antenna opening surface of the antenna cover is opened with a window and filled with PMI foam, and the PMI foam is covered with a layer of epoxy resin paint;

[0013] Through this implementation, the receiving down-conversion module and the transmitting up-conversion module are protected, thereby achieving a waterproof effect on the product.

[0014] In one embodiment, it further comprises a tripod and a conversion plate arranged on the tripod, wherein the conversion plate is provided with a module mounting plate, and the receiving down-conversion module and the transmitting up-conversion module are respectively arranged at two ends of the module mounting plate;

[0015] Through this implementation, the transmitting and receiving antennas are arranged in an orthogonal polarization manner, and the isolation requirement between the transmitting and receiving antennas is improved by increasing the distance in space.

[0016] In one embodiment, a first absorbing layer is provided around the receiving antenna and the transmitting antenna;

[0017] Through this embodiment, the first absorbing layer arranged around the receiving antenna and the transmitting antenna reduces the backward radiation and receiving capability of the antenna, reduces the influence of the structure on the isolation of the transmitting and receiving antennas, improves the isolation of the transmitting and receiving antennas, and at the same time, the metal loaded absorbing layer is arranged on the absorbing mounting plate.

[0018] In one embodiment, the module mounting plate is further provided with an absorbing mounting plate, the absorbing mounting plate is located between the transmitting up-conversion module and the receiving down-conversion module, the projections of the transmitting up-conversion module and the receiving down-conversion module toward the absorbing mounting plate are both located within the absorbing mounting plate, and a metal-loaded absorbing layer is provided on the absorbing mounting plate;

[0019] Through this implementation, that is, in the forward and backward directions of the antenna radiation, both sides of the transmitting and receiving antennas have absorbing materials, that is, the isolation between the transmitting and receiving antennas is further improved.

[0020] The present invention also provides an active deflection method for an airborne millimeter-wave radar, based on the above-mentioned active deflection device, comprising the following steps:

[0021] Signal reception: receiving millimeter wave signals of multiple frequency bands through receiving antennas;

[0022] Front-end processing: low-noise amplification of received millimeter-wave signals;

[0023] Down-conversion, converting the millimeter wave signal after low noise amplifier processing to an intermediate frequency signal;

[0024] Delay processing: divide the intermediate frequency signal into multiple channels and filter them, and delay each channel of information before combining them;

[0025] Up-conversion, restoring the combined intermediate frequency signal to the initial frequency band;

[0026] Power amplification, amplifying and filtering the up-converted signal;

[0027] Signal transmission: The amplified signal is transmitted to the target airspace through the transmitting antenna.

[0028] In one embodiment, the millimeter wave signal includes an 8mm frequency band signal and a 3mm frequency band signal.

[0029] The beneficial effects of the present invention are:

[0030] The received millimeter-wave radar signal is processed with low noise amplification to complete the linear amplification of the received signal, and then the frequency is converted to the intermediate frequency band. The intermediate frequency signal is power-divided and filtered, and the inherent delay of the filter is used to achieve separate delay for each signal. After the delay is completed, the multiple signals are combined and then up-converted back to the initial RF band. After power amplification, they are air-fed to the radar receiver through the transmitting antenna, approaching the multi-point echo characteristics of the real protected target, thereby attracting the millimeter-wave radar to lock on and quickly protect high-value targets. The device has a simple structure and low implementation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0032] Figure 1 A schematic diagram showing the structure of the deflection device of the present invention is shown;

[0033] Figure 2 A schematic diagram showing the working principle of the deflection guiding method of the present invention is shown;

[0034] Figure 3 The detailed design block diagram of the receiving down-conversion module of the present invention is shown;

[0035] Figure 4 Shows a detailed design block diagram of the transmit up-conversion module of the present invention;

[0036] Figure 5 The schematic diagram of the 8mm band antenna gain simulation of the present invention is shown;

[0037] Figure 6 A schematic diagram of the 3mm band antenna gain simulation of the present invention is shown;

[0038] Figure 7 The 3mm band gain noise calculation diagram of the present invention is shown;

[0039] Figure 8 The 8mm band gain noise calculation diagram of the present invention is shown;

[0040] Fig. 9 A schematic diagram showing simulation results of the filter of the present invention is shown;

[0041] Fig.10 The filter group delay simulation result diagram of the present invention is shown;

[0042] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0043] Reference numerals:

[0044] 1-tripod, 2-transmitting up-conversion module, 3-receiving down-conversion module, 4-module mounting plate, 5-wave absorbing mounting plate. DETAILED DESCRIPTION

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] The present invention provides an active deflection device for airborne millimeter wave radar, such as Figure 1 As shown,

[0047] It comprises a tripod 1 and a conversion plate arranged on the tripod 1, the conversion plate is provided with a module mounting plate 4, the receiving down-conversion module 3 and the transmitting up-conversion module 2 are respectively arranged at two ends of the module mounting plate 4;

[0048] Wherein, the receiving down-conversion module 3 has a receiving antenna for receiving millimeter wave radar signals;

[0049] A transmitting up-conversion module 2, which has a transmitting antenna for transmitting a signal to a target airspace;

[0050] The millimeter wave radar signal is processed by the receiving down-conversion module 3 for low noise amplification and frequency conversion to the intermediate frequency band, and then is divided into multiple paths and filtered, delayed and combined. Then, it is restored to the initial band and power amplified by the transmitting up-conversion module 2 before being transmitted to the target airspace;

[0051] Specifically, Figure 3 and Figure 4 As shown, the receiving down-conversion module 3 also includes a low noise amplifier, a power divider and a filter, and the transmitting up-conversion module 2 also includes an amplifier and a filter;

[0052] It should be noted that the active deflection device provided in this embodiment can perform low-noise amplification processing on the received millimeter-wave radar signal, complete linear amplification of the received signal, and then convert it to the intermediate frequency band, perform power division and filtering processing on the intermediate frequency signal, and realize the delay of each signal separately through the inherent delay of the filter, and after the delay is completed, the multi-channel signal is combined and processed, and then converted back to the initial radio frequency band after up-conversion, and then fed to the radar receiver through the transmitting antenna after power amplification, so as to approach the real protected target echo, thereby attracting the millimeter-wave radar to lock, and quickly protect the high-value target, and the device has a simple structure and low cost;

[0053] Furthermore, the receiving down-conversion module 3 and the transmitting up-conversion module 2 both have an antenna cover, and the antenna opening surface of the antenna cover is opened with a window filled with PMI foam, and the PMI foam is covered with a layer of epoxy resin paint;

[0054] like Figure 5 As shown, the simulation structure of the radiation pattern of the 8mm band antenna is shown. The gain of the antenna is greater than 5.4dBi in the 32GHz, 34.5GHz and 37GHz bands. The antenna polarization mode is oblique polarization, installed at an angle of 45°, and the beam width in the elevation direction is greater than 90°, and the beam width in the azimuth direction is greater than 90°.

[0055] like Figure 6 As shown, the gain of the antenna is greater than 6.0dBi in the 92GHz, 94GHz and 96GHz frequency bands. The antenna polarization mode is oblique polarization, installed at an angle of 45°, the beam width in the elevation direction is greater than 90°, and the beam width in the azimuth direction is greater than 90°;

[0056] It should be noted that if Figure 3 and Figure 4 As shown, the delay module is divided into 3mm band delay and 8mm band delay, both of which are down-converted and then up-converted to their respective RF bands after delay processing. The intermediate frequency is 6-7GHz, the 3mm band local oscillator is 86-89GHz, and the frequency hopping step is 400MHz. The 8mm band local oscillator is 26-30GHz, and the frequency hopping step is 400MHz.

[0057] In one embodiment, a first absorbing layer is provided around the receiving antenna and the transmitting antenna, that is, the backward radiation and receiving capability of the antenna are reduced, the influence of the structure on the isolation of the transmitting and receiving antennas is reduced, and the isolation of the transmitting and receiving antennas is improved;

[0058] Furthermore, an absorbing mounting plate 5 is further provided on the module mounting plate 4, and the absorbing mounting plate 5 is located between the transmitting up-conversion module 2 and the receiving down-conversion module 3, and the projections of the transmitting up-conversion module 2 and the receiving down-conversion module 3 toward the absorbing mounting plate 5 are both located within the absorbing mounting plate 5, and a metal-loaded absorbing layer is provided on the absorbing mounting plate 5, so as to further improve the isolation between the transmitting and receiving antennas, so as to achieve a transmitting and receiving isolation effect of 110 dB;

[0059] In one embodiment, Figure 7 As shown, the noise figure of the 3mm band link is 4.67dB, the gain is 97dB, the antenna gain is ≥3dB, the output gain of the 3mm band is 104dB, the technical requirement is ≥98dB, and the margin is sufficient. During debugging, attenuators can be placed at appropriate positions in the link to ensure the requirements of the overall gain index;

[0060] like Figure 8 As shown, the noise figure of the 8mm band link is 3.1dB, the gain is 98dB, plus the antenna gain at full pitch angle ≥2dB, the output gain of the 8mm band is 103dB; the technical requirement is ≥93dB, which fully meets the technical index requirements. During debugging, attenuators can be placed at appropriate positions in the link to ensure the requirements of the overall gain index;

[0061] like Fig. 9 As shown, after down-converting the frequency to 6-7 GHz, the local oscillator frequency is changed to make the RF frequency correspond to it one by one. Then only one 6-7 GHz cavity filter is needed. The suppression of the 6-7 GHz cavity filter at 5.5 and 7.5 GHz can easily reach 25 dBc.

[0062] like Fig.10 As shown, the filter itself can have a delay characteristic. By adjusting the filter order, the transmission delay is designed into the filter index, which not only meets the suppression requirements but also achieves the delay effect. 0, 2, and 4 filters are set in the three delay channels to realize three delay signals with an interval of 6.7ns, so that the delay interval of the transmission channel is ≥6.7ns.

[0063] The present invention also provides an active deflection method for airborne millimeter wave radar, such as Figure 2 As shown, the following steps are included:

[0064] Signal reception: receiving millimeter wave signals of multiple frequency bands through receiving antennas;

[0065] Front-end processing: low-noise amplification of received millimeter-wave signals;

[0066] Down-conversion, converting the millimeter wave signal after low noise amplifier processing to an intermediate frequency signal;

[0067] Delay processing: divide the intermediate frequency signal into multiple channels and filter them, and delay each channel of information before combining them;

[0068] Up-conversion, restoring the combined intermediate frequency signal to the initial frequency band;

[0069] Power amplification, amplifying and filtering the up-converted signal;

[0070] Signal transmission, transmitting the amplified signal to the target airspace through the transmitting antenna:

[0071] Specifically, millimeter wave signals include 8mm frequency band signals and 3mm frequency band signals;

[0072] Among them, in the delay processing step, the intermediate frequency signal is split into three paths and filtered;

[0073] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0074] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. An active deflection device for airborne millimeter-wave radar, characterized in that: include: A receiving down-conversion module having a receiving antenna for receiving millimeter wave radar signals; A transmit up-conversion module having a transmit antenna for transmitting a signal to a target airspace; Among them, the millimeter wave radar signal is processed by the receiving down-conversion module for low noise amplification and frequency conversion to the intermediate frequency band, and then power-divided into multiple paths and filtered, delayed and combined. It is then restored to the initial band by the transmitting up-conversion module and power amplified before being transmitted to the target airspace.

2. The active deflection device for airborne millimeter-wave radar according to claim 1, characterized in that: The receiving down-conversion module further includes a low noise amplifier, a power divider and a filter, and the transmitting up-conversion module further includes an amplifier and a filter.

3. The active deflection device for airborne millimeter-wave radar according to claim 1, characterized in that: The receiving down-conversion module and the transmitting up-conversion module both have an antenna cover, and the antenna opening surface of the antenna cover has a window filled with PMI foam, and the PMI foam is covered with a layer of epoxy resin paint.

4. The active deflection device for airborne millimeter-wave radar according to claim 1, characterized in that: It also includes a tripod and a conversion plate arranged on the tripod, wherein a module mounting plate is arranged on the conversion plate, and the receiving down-conversion module and the transmitting up-conversion module are respectively arranged at two ends of the module mounting plate.

5. The active deflection device for airborne millimeter wave radar according to claim 4, characterized in that: A first wave absorbing layer is arranged around the receiving antenna and the transmitting antenna.

6. The active deflection device for airborne millimeter wave radar according to claim 4, characterized in that: A wave absorbing mounting plate is also provided on the module mounting plate, and the wave absorbing mounting plate is located between the transmitting up-conversion module and the receiving down-conversion module. The projections of the transmitting up-conversion module and the receiving down-conversion module toward the wave absorbing mounting plate are both located inside the wave absorbing mounting plate, and a metal-loaded wave absorbing layer is provided on the wave absorbing mounting plate.

7. An active deflection method for airborne millimeter wave radar, based on the active deflection device according to any one of claims 1 to 6, characterized in that: The steps include: Signal reception: receiving millimeter wave signals of multiple frequency bands through receiving antennas; Front-end processing: low-noise amplification of received millimeter-wave signals; Down-conversion, converting the millimeter wave signal after low noise amplifier processing to an intermediate frequency signal; Delay processing: divide the intermediate frequency signal into multiple channels and filter them, and delay each channel of information before combining them; Up-conversion, restoring the combined intermediate frequency signal to the initial frequency band; Power amplification, amplifying and filtering the up-converted signal; Signal transmission: The amplified signal is transmitted to the target airspace through the transmitting antenna.

8. The method for active deflection of airborne millimeter wave radar according to claim 7, characterized in that: The millimeter wave signal includes an 8mm frequency band signal and a 3mm frequency band signal.

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