A frequency diversity radar signal simulation device

Abstract

The present invention discloses a frequency diversity radar signal simulation device, comprising a radar signal generating module, a radio frequency frequency diversity signal generating module, a frequency band transmitter, a branch output circulator, an antenna turntable and an antenna device; wherein the radar signal generating module obtains a radar intermediate frequency signal based on the coherence of a digital radar waveform and a second local oscillator intermediate frequency signal; in the radio frequency frequency diversity signal generating module, the radar intermediate frequency signal is mixed with two local oscillator signals of different bands to form radio frequency radar signals of different frequency bands; the radio frequency radar signals of each frequency band are amplified by the transmitter to become high-power radio frequency signals; the high-power radio frequency signals are respectively branched and output by the circulator and then pass through the antenna turntable, and form a beam through the antenna device to radiate into the air. The present invention uses the same antenna transmitter to set frequency diversity radar signals of more than two frequency bands for tactical use such as anti-reconnaissance and anti-radiation missile target shooting, and has the characteristics of small size, light weight, flexible layout and small combat damage.

Description

Technical Field

[0001] The present invention relates to the field of electronic engineering technology, and more specifically, to a frequency diversity radar signal simulation device. Background Art

[0002] Ordinary radar signal simulators can generate realistic radar signals, but the spatial coverage and rotation of the radar beam are difficult to achieve realistic effects. Directional radar simulators only generate radar signals in a certain direction and cannot provide complex electromagnetic environments and cover main combat radars for simulated training, exercises or even real battlefields. Summary of the invention

[0003] In order to solve the above technical problems, the present invention aims to provide a frequency diversity radar signal simulation device with multi-band fusion, which provides application equipment for constructing complex electromagnetic environment and covering main combat radar and tactical training strike targets.

[0004] In order to solve the above technical problems, the present invention adopts a frequency diversity radar signal simulation device, which includes a radar signal generation module, a radio frequency diversity signal generation module, a frequency band transmitter, a branch output circulator, an antenna turntable and an antenna device; wherein,

[0005] The radar signal generating module obtains a radar intermediate frequency signal based on the digital radar waveform and the second local oscillator intermediate frequency signal;

[0006] In the radio frequency diversity signal generating module, the radar intermediate frequency signal is mixed with two local oscillator signals of different frequency bands to form radio frequency radar signals of different frequency bands;

[0007] The RF radar signals of each frequency band are amplified by the transmitter and become high-power RF signals;

[0008] The high-power RF signal is divided into two paths and output from the circulator, then passes through the antenna turntable, and forms a beam through the antenna device to radiate into the air.

[0009] Furthermore, the antenna device includes a grid reflector and a horn feed, and the horn feed is located at the focal axis focus of the grid reflector.

[0010] Furthermore, the RF frequency diversity signal generating module includes a power divider, a mixer and a filter. In the power divider part, the radar intermediate frequency signal is divided into two paths, one of which is coherently coupled with the first local oscillator A in the mixer to obtain an A-path RF radar signal, and the other is coherently coupled with the first local oscillator B in the mixer to obtain a B-path RF radar signal. The A-path and B-path RF radar signals are filtered by filters respectively.

[0011] Furthermore, the filtered A-channel and B-channel RF radar signals are respectively connected to two horn feed sources through RF slip rings of the antenna turntable.

[0012] Furthermore, the installation angle of the horn feed is adjusted according to the beam elevation angle, and the beam direction is changed according to the parabola focusing principle.

[0013] Furthermore, one of the horn feed sources is flipped at a vertical angle to form vertical and horizontal polarization diversity.

[0014] As a preferred implementation scheme of the present application, the first local oscillator A is a local oscillator source signal of the L band, and the first local oscillator B is a local oscillator source signal of the S band.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The present invention uses the same antenna transmitter to set frequency diversity radar signals of more than two frequency bands for tactical use such as anti-reconnaissance and anti-radiation missile shooting. It has the characteristics of small size, light weight, flexible layout and small combat damage. It can be widely used in radar position deployment, training test targets, etc. It is an economical and practical radar simulation device. Especially when used in actual installation target shooting training and weapon verification, it can achieve better tactical effects at a relatively low cost. Figure 5 As shown. The host will not be seriously damaged under the reinforced concrete shelter, because the effective range of the general anti-radiation missile is about 20km, and its warhead uses high-explosive armor-piercing shells, which have a very obvious killing effect on ground targets, but basically have no killing power on underground equipment. The outdoor part of the present invention is an antenna turntable and a parabolic grid antenna, which are low in cost and very convenient to replace in case of war damage. Therefore, the device is economical and practical in anti-radiation missile verification and training, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural block diagram of the frequency diversity radar signal simulation device of this application;

[0018] Figure 2 This is a schematic diagram of the product structure of the frequency diversity radar signal simulation device of this application;

[0019] Figure 3 Schematic diagram of a polarization diversity feed in an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the beam of a frequency diversity radar signal simulation device in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the deployment of the application position shelter of the frequency diversity radar signal simulation device of this application;

[0022] In the figure, 1-antenna, 2-radiation feed source, 3-turntable, 4-RF cable, 5-fortification shelter building layer, 6-host. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0024] The present invention aims to provide a frequency diversity radar signal simulation device with multi-band fusion, which provides application equipment for building complex electromagnetic environment, covering main combat radar and tactical training and attacking targets. Ordinary radar signal simulators can generate realistic radar signals, but the spatial coverage and rotation of radar beams are difficult to achieve realistic effects.

[0025] The present invention is a small-scale real radar tactical application simulation device. By using a grid antenna 1 emitter and setting a dual-band feed at the focus, a frequency diversity radar signal simulation device can be formed. Its characteristic is that signals of different frequency bands form different beams, so that one antenna 1 can simulate multiple radar signals and their beam pointing effects. The present invention uses a 600mm×900mm grid reflector and sets radiation feeds 2 of two frequency bands, L and S, to form radar beams of two frequencies, L and S, in the air. The configuration of a small antenna 1 turntable 3 can realistically imitate the tactical characteristics of air-to-air radars, which is of great significance for simulating radar deployment, disrupting enemy wireless signal detection and protecting main combat radars, especially for targets used in anti-radiation missile shooting. The transmitter is moved underground, and only the antenna is exposed for missile homing. After the damage in battle, the antenna 1 facility can be replaced and put back into use, which is a good configuration for missile tactical training. The present invention can not only achieve frequency diversity, but also polarization diversity configuration. The two-band feeds are respectively used for horizontal line polarization and vertical line polarization, so as to achieve the effect of polarization diversity. System components: Figure 1 shown.

[0026] The composition of the frequency diversity radar signal simulation device provided by the present application is as follows: Figure 1 As shown, the main components are radar signal generation, RF frequency diversity signal generation, S and L band transmitters, branch output circulator, antenna 1 turntable 3 (high frequency slip ring), antenna 1 device, etc.

[0027] The radar signal generation part is the frequency diversity common part. The digital radar waveform generated by the waveform generator is coherent with the second local oscillator intermediate frequency signal to form a radar intermediate frequency signal. It is divided into two paths by a power divider and sent to the L and S RF signal generation circuits respectively. They are coherent with the L-band 1 local oscillator and the S-band 1 local oscillator in the mixer to form L and S-band RF radar signals respectively. After being amplified by their respective transmitters, they become high-power RF signals. This RF signal is connected to the L and S feed sources through the RF slip rings of the antenna 1 turntable 3 respectively, and is reflected and focused by the grid to form a beam that radiates into the air. The display and control computer can control the equipment to perform waveform selection, frequency selection, frequency hopping and other operations. Figure 4, is a schematic diagram of the L and S band radar beams. Due to slight differences in the feed installation angles, the beam angles formed are slightly different. The feed position can be appropriately adjusted according to tactical requirements to achieve the ideal radiation beam angle.

[0028] Based on frequency diversity, the present invention can also perform polarization diversity as required. Figure 3 As shown in the figure. By flipping one of the feed sources 900 degrees, vertical and horizontal polarization diversity can be formed. Polarization diversity is of certain significance for radar anti-interference and anti-reconnaissance.

[0029] The present invention uses a 600mm×900mm grid reflector plus a horn feed structure, the antenna 1 has a gain greater than 20dB, and is provided with radiation feeds 2 of L and S bands, the frequency range is 1120MHz-1400MHz for L band, 3100MHz-3500MHz for S band, and the radio frequency equivalent radiation power ERP is greater than 62dBm (about 1580W). The transmitter output power is about 2Kw. The beam widths of the L and S band antennas 1 are both 100 in azimuth and 140 in elevation, and a receiving device with a sensitivity of -60dBm at a distance of 25Km can effectively capture the target.

[0030] The present invention is a small-scale real radar tactical application simulation device. It uses a grid antenna 1 emitter and sets a dual-band feed at the focus to form a frequency diversity radar signal simulation device. Its characteristic is that signals of different frequency bands form different beams, so that one antenna 1 can simulate multiple radar signals and their beam directions.

[0031] The present invention uses a 600mm×900mm grid reflector, sets radiation feed sources 2 of two frequency bands L and S, and forms radar beams of two frequencies L and S in the air. The configuration of a small antenna 1 turntable 3 can realistically imitate the tactical characteristics of air-to-air radars, which is of great significance for simulating radar deployment, disrupting the opponent's wireless signal detection and protecting the main combat radar, especially for the target of anti-radiation missile shooting. The transmitter is moved underground, and only the antenna 1 is exposed for missile homing. After the damage in the battle, the antenna 1 facility can be replaced and put into use again, which is a good configuration for missile tactical training. The present invention can not only achieve frequency diversity, but also polarization diversity configuration. The 2-band feed sources are respectively used for horizontal line polarization and vertical line polarization, so as to achieve the effect of polarization diversity.

[0032] The present invention is an integrated telecontrol wireless radar simulation device. Generally, after the off-road vehicle-mounted equipment arrives at the designated location, the automatic leveling device is started, and the equipment-mounted vehicle automatically reaches a balanced state. Connect the power line of the self-provided power station (which can be fixedly connected) and start the power supply of the equipment. The roof radar antenna 1 is in a 45-degree upward state, which can fully cover the 90-degree vertical space beam. When the power supply in the car is turned on, the equipment is in standby mode. When operating locally, the radar signals can be selected and set one by one, including signal categories (including conventional pulses, linear frequency modulation, nonlinear frequency modulation, phase encoding, etc.), operating frequency, pulse width, pulse repetition frequency, output power, etc., and then turn on the transmitting switch, and the equipment will work according to the set parameters. When no parameters need to be set, the equipment works according to the defective state parameters (pre-set parameters). When operating by telecontrol remote control, the operation of the remote control center is the same as the local control.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A frequency diversity radar signal simulation device, characterized in that: The signal simulation device comprises a radar signal generating module, a radio frequency diversity signal generating module, a frequency band transmitter, a branch output circulator, an antenna turntable and an antenna device; wherein, The radar signal generating module obtains a radar intermediate frequency signal based on the digital radar waveform and the second local oscillator intermediate frequency signal; In the RF frequency diversity signal generating module, the radar intermediate frequency signal is mixed with two local oscillator signals of different bands to form RF radar signals of different frequency bands; the digital radar waveform generated by the waveform generator is coherently combined with the second local oscillator intermediate frequency signal to form a radar intermediate frequency signal, which is divided into two paths by a power divider and sent to the L and S RF signal generating circuits respectively, and is coherently combined with the L band 1 local oscillator and the S band 1 local oscillator in the mixer to form L and S band RF radar signals respectively; The RF radar signals of each frequency band are amplified by the transmitter and become high-power RF signals; The high-power radio frequency signal is divided into two paths and output from the circulator, and then passes through the antenna turntable, and forms a beam through the antenna device to radiate into the air; the antenna device includes a grid reflector and a horn feed source, and the horn feed source is located at the focal axis of the grid reflector; The installation angle of the horn feed is adjusted according to the beam elevation angle, and the beam direction is changed according to the parabola focusing principle.

2. A frequency diversity radar signal simulation device according to claim 1, characterized in that: The radio frequency diversity signal generating module includes a power divider, a mixer and a filter. In the power divider part, the radar intermediate frequency signal is divided into two paths, one of which is coherently connected with the first local oscillator A in the mixer to obtain an A-path radio frequency radar signal, and the other is coherently connected with the first local oscillator B in the mixer to obtain a B-path radio frequency radar signal. The A-path and B-path radio frequency radar signals are filtered by filters respectively.

3. A frequency diversity radar signal simulation device according to claim 2, characterized in that: The filtered A-channel and B-channel RF radar signals are respectively connected to two horn feed sources through the RF slip rings of the antenna turntable.

4. A frequency diversity radar signal simulation device according to claim 1, characterized in that: One of the horn feed sources is flipped at a vertical angle to form vertical and horizontal polarization diversity.

5. A frequency diversity radar signal simulation device according to claim 2 or 3, characterized in that: The first local oscillator A is a local oscillator source signal of the L band, and the first local oscillator B is a local oscillator source signal of the S band.

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