Polarization adaptive radio frequency simulation antenna array simulation system and method

Abstract

The invention discloses a polarization adaptive radio frequency simulation antenna array simulation system and method, and relates to the technical field of radio frequency simulation, the polarization adaptive radio frequency simulation antenna array simulation system comprises a receiving antenna array, a radio frequency feed channel, a polarization characteristic measurement device and a polarization signal simulator, the receiving antenna array and the radio frequency feed channel achieve gating of receiving antennas through switch switching, the radio frequency feed channel is connected with the polarization characteristic measuring device through signals, and an output interface of the polarization characteristic measuring device is connected with an input interface of the control resolving module. The control resolving module receives an amplitude-phase measurement value output by the polarization measurement equipment, and an output interface of the control resolving module is connected with an input interface of the polarization signal simulator; according to the invention, polarization characteristic measurement can be carried out on the signal emitted by the tested equipment in real time, and polarization characteristic simulation of a radar target echo signal, an interference signal and a clutter signal is completed by using a measurement result, so that the signal polarization characteristic simulation accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency simulation technology, and in particular to a polarization adaptive radio frequency simulation antenna array simulation system and method. Background Art

[0002] It is well known that the RF simulation antenna array is an important component of the semi-physical RF simulation test system. It is mainly used to radiate the RF signal generated by the signal environment simulation subsystem into the microwave darkroom, and under the control of the semi-physical RF simulation test system control computer, by controlling the amplitude and phase of the RF signal, simulate the continuous movement of the radar target in azimuth and elevation. Currently, polarization information is increasingly used in the field of radar and radar countermeasure equipment. Therefore, in order to adapt to the performance assessment needs of radar and radar countermeasure equipment, the semi-physical RF simulation test system should be able to adaptively simulate the generation of polarization target echo signals and polarization interference signals according to the polarization characteristics of the equipment under test during the test.

[0003] In order to simulate the corresponding polarization target echo signal and polarization interference signal according to the polarization characteristics of the equipment under test, the semi-physical RF simulation test system should first be able to accurately measure the polarization characteristics of the equipment under test, and then ensure the accuracy and confidence of the signal polarization characteristics based on the measured polarization characteristic parameters of the equipment under test, the target polarization characteristics and the polarization interference strategy.

[0004] At present, the simulation of polarization characteristics of semi-physical RF simulation test system requires the corresponding polarization characteristics of the test equipment to be set in advance. However, when the test equipment has the function of real-time polarization change, this pre-set method will not be able to accurately simulate the corresponding polarization signal. The semi-physical simulation test system uses the internal integrated target polarization characteristic model to solve the amplitude and phase information of the two orthogonal signals, and adjusts the amplitude and phase of the two orthogonal signals in real time according to the solved data by controlling the programmable attenuators and programmable phase shifters of the two channels in the antenna array RF feed channel, so as to realize the real-time adjustment of the polarization characteristics of the target echo signal. The polarization characteristics of the radar target echo are closely related to the polarization characteristics of the radar target on the one hand, and are also related to the polarization characteristics of the equipment transmitting antenna. The current semi-physical simulation test system cannot perceive the polarization characteristics of the equipment transmitting antenna, and only modulates the polarization characteristics of the radar target echo signal through the built-in radar target polarization characteristic model. The simulated echo signal has low fidelity. Summary of the invention

[0005] In order to overcome the deficiencies in the background technology, the present invention discloses a polarization adaptive radio frequency simulation antenna array simulation system and method.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme: A polarization adaptive radio frequency simulation antenna array simulation system comprises a receiving antenna array, a radio frequency feeding channel, a polarization characteristic measuring device and a polarization signal simulator. The receiving antenna array is arranged on the radio frequency simulation antenna array array surface. The receiving antenna array and the radio frequency feeding channel are switched by switches to realize gating of the receiving antenna. The radio frequency feeding channel is connected to the polarization characteristic measuring device by signals. The output interface of the polarization characteristic measuring device is connected to the input interface of a control solution module. The control solution module receives amplitude and phase measurement values ​​output by the polarization measurement device. The output interface of the control solution module is connected to the input interface of the polarization signal simulator.

[0007] The polarization adaptive radio frequency simulation antenna array simulation system also includes a power supply module, which is respectively connected to the radio frequency feeding channel and the polarization characteristic measurement device.

[0008] In the polarization adaptive radio frequency simulation antenna array simulation system, the receiving antenna array adopts a dual-polarized horn antenna as an array element, and the horn antenna is installed on an adjustment mechanism to ensure that the axis of the antenna points to the test equipment.

[0009] The polarization adaptive RF simulation antenna array simulation system also includes a control solution module, and the input port of the control solution module adopts a standard LVDS receiving circuit to receive the antenna pointing information of the test equipment sent by the semi-physical RF simulation system through LVDS.

[0010] The polarization adaptive RF simulation antenna array simulation system, the RF feeding channel includes an equalizer A, a programmable attenuator A, an LNA low noise amplifier A, an equalizer B, an electronic switch matrix, a programmable attenuator B, an LNA low noise amplifier B and an equalizer C connected in sequence through signals, wherein the programmable attenuator A and the programmable attenuator B are used to adjust the link gain of the RF feeding channel to avoid the low noise amplifier in the channel working in a nonlinear region due to excessive input signal power, thereby causing large amplitude and phase measurement errors; the electronic switch matrix completes the gating of the receiving antenna under the control of the control and solution module; the LNA low noise amplifier A and the LNA low noise amplifier B are used for signal attenuation compensation to ensure that the output power of the RF feeding channel meets the signal detection requirements of the polarization characteristic measurement equipment.

[0011] The polarization adaptive RF simulation antenna array simulation system and the polarization characteristic measurement device include a down-conversion unit, an ADC unit, a signal parameter measurement unit and a local oscillator unit connected in sequence. The local oscillator unit provides the down-conversion unit with a frequency conversion local oscillator signal required for frequency conversion. The down-conversion unit mixes the received two-way horizontal polarization RF signal and the vertical polarization RF signal with the frequency conversion local oscillator signal generated by the local oscillator unit to obtain an intermediate frequency signal and amplify it. The ADC unit performs A / D sampling on the intermediate frequency signal to obtain a baseband digital radar signal. The signal parameter measurement unit performs amplitude and phase measurement on the received baseband digital radar signal to finally obtain the amplitude difference and phase difference of the two signals.

[0012] A method for simulating a polarization adaptive radio frequency simulation antenna array specifically comprises the following steps: S1. Arrange multiple receiving antennas with dual-polarization ports on the RF simulation antenna array to form a receiving antenna array, and design corresponding RF feeding channels to achieve gating of the receiving antennas through switch switching; S2, following the previous step, the two selected receiving antenna microwaves RH1 and RV1 are respectively selected to enter the two RF feeding channels, and the signals are modulated for the first time by the equalizer A, the programmable attenuator A, and the LNA low noise amplifier A in sequence, and the signals are then modulated for the second time by the equalizer B, the electronic switch matrix, the programmable attenuator B, and the LNA low noise amplifier B in sequence, and the modulated signals are again passed through the equalizer C to enter the polarization characteristic measurement device to achieve accurate measurement of the amplitude and phase of the horizontally polarized RF signal and the vertically polarized RF signal; S3, following the previous step, the local oscillator unit provides the down-conversion unit with the frequency conversion local oscillator signal required for frequency conversion, and the down-conversion unit mixes the received two-way horizontal polarization RF signal and the vertical polarization RF signal with the frequency conversion local oscillator signal generated by the local oscillator unit to obtain the intermediate frequency signal and amplify it; the ADC unit performs A / D sampling on the intermediate frequency signal to obtain the baseband digital radar signal, and the signal parameter measurement unit performs amplitude and phase measurement on the received baseband digital radar signal to finally obtain polarization characteristic information, that is, the amplitude difference and phase difference of the two signals, and the signal parameter measurement unit sends the output polarization characteristic information to the polarization signal simulator through the control solution module; S4. The polarization signal simulator controls and simulates the polarization characteristics of the radar echo signal, interference signal and clutter signal according to the amplitude and phase information of the two signals.

[0013] The polarization adaptive RF simulation antenna array simulation method, in step S3, controls the solution module to complete the initial value calibration measurement of the amplitude and phase characteristics of all RF feeding channels before testing, and forms an initial value calibration table; during the test, according to the antenna pointing information of the test equipment and the installation positions of different receiving antennas, a suitable receiving antenna is selected, the switch control word in the RF feeding channel is solved, and the selected receiving antenna is selected; according to the signal amplitude information output by the polarization characteristic measurement device, the working state of the RF feeding channel is judged, and the amplitude control code is output to adjust the overall gain of the RF feeding channel to ensure that the RF feeding channel works in the linear region; after the working state of the RF feeding channel is adjusted, the amplitude and phase measurement results output by the polarization characteristic measurement device are received, and the polarization characteristic information of the signal is output to the polarization signal simulator in combination with the calibration data.

[0014] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: The polarization adaptive radio frequency simulation antenna array simulation system and method described in the present invention arranges receiving antennas on the antenna array array surface, receives signals transmitted by equipment, and measures the polarization characteristics of the signals in real time, and uses the measurement information and the built-in radar target polarization characteristic model of the semi-physical simulation test system to complete the accurate simulation of the polarization characteristics of the target echo signal; the present invention can measure the polarization characteristics of the signals transmitted by the tested equipment in real time, and use the measurement results to complete the polarization characteristic simulation of the radar target echo signal, interference signal and clutter signal, so as to improve the simulation accuracy of the signal polarization characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural block diagram of the present invention.

[0016] Figure 2 It is a schematic diagram of the principle of the radio frequency feeding channel of the present invention.

[0017] Figure 3 It is a schematic diagram of the principle of the polarization characteristic measurement device of the present invention. DETAILED DESCRIPTION

[0018] The present invention can be explained in detail by the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0019] Combined with Figure 1-3The polarization adaptive RF simulation antenna array simulation system comprises a receiving antenna array, a RF feeding channel, a polarization characteristic measurement device and a polarization signal simulator, wherein the receiving antenna array is arranged on the RF simulation antenna array array surface, the receiving antenna array and the RF feeding channel are switched by switches to realize the gating of the receiving antenna, the RF feeding channel and the polarization characteristic measurement device are connected by signals, the output interface of the polarization characteristic measurement device is connected to the input interface of the control solution module, the control solution module receives the amplitude and phase measurement values ​​output by the polarization measurement device, and the output interface of the control solution module is connected to the input interface of the polarization signal simulator; the system also comprises a power supply module, which is respectively connected to the RF feeding channel and the polarization characteristic measurement device; the system also comprises a control solution module, the input port of which adopts a standard LVDS receiving circuit to receive the antenna pointing information of the test equipment sent by the semi-physical RF simulation system through LVDS; The radio frequency feeding channel comprises an equalizer A, a programmable attenuator A, an LNA low noise amplifier A, an equalizer B, an electronic switch matrix, a programmable attenuator B, an LNA low noise amplifier B and an equalizer C which are sequentially connected by signals, wherein the programmable attenuator A and the programmable attenuator B are used to adjust the link gain of the radio frequency feeding channel to avoid the low noise amplifier in the channel working in a nonlinear region due to excessive input signal power, thereby causing large amplitude and phase measurement errors; the electronic switch matrix completes the gating of the receiving antenna under the control of the control and solution module; the LNA low noise amplifier A and the LNA low noise amplifier B are used for signal attenuation compensation to ensure that the output power of the radio frequency feeding channel meets the signal detection requirements of the polarization characteristic measurement equipment; The polarization characteristic measuring device comprises a down-conversion unit, an ADC unit, a signal parameter measuring unit and a local oscillator unit which are connected in sequence. The local oscillator unit provides the down-conversion unit with a frequency conversion local oscillator signal required for frequency conversion. The down-conversion unit mixes two received horizontally polarized radio frequency signals and vertically polarized radio frequency signals with the frequency conversion local oscillator signal generated by the local oscillator unit to obtain an intermediate frequency signal and amplify the signal. The ADC unit performs A / D sampling on the intermediate frequency signal to obtain a baseband digital radar signal. The signal parameter measuring unit performs amplitude and phase measurement on the received baseband digital radar signal to finally obtain an amplitude difference and a phase difference between the two signals.

[0020] Furthermore, the receiving antenna array uses a dual-polarized horn antenna as an array element, and the horn antenna is installed on an adjustment mechanism to ensure that the axis of the antenna points to the equipment under test; Specifically, in order to avoid frequent switching of receiving antennas during the experiment, it is necessary to reasonably design the layout of the receiving antenna array according to the antenna radiation pattern characteristics and pointing adjustment range of the equipment under test, to ensure that the receiving antenna is located within the main beam range of the equipment under test in different states.

[0021] A method for simulating a polarization adaptive radio frequency simulation antenna array specifically comprises the following steps: S1. Arrange multiple receiving antennas with dual-polarization ports on the RF simulation antenna array to form a receiving antenna array, and design corresponding RF feeding channels to achieve gating of the receiving antennas through switch switching; S2, following the previous step, the two selected receiving antenna microwaves RH1 and RV1 are respectively selected to enter the two RF feeding channels, and the signals are modulated for the first time by the equalizer A, the programmable attenuator A, and the LNA low noise amplifier A in sequence, and the signals are then modulated for the second time by the equalizer B, the electronic switch matrix, the programmable attenuator B, and the LNA low noise amplifier B in sequence, and the modulated signals are again passed through the equalizer C to enter the polarization characteristic measurement device to achieve accurate measurement of the amplitude and phase of the horizontally polarized RF signal and the vertically polarized RF signal; S3, following the previous step, the local oscillator unit provides the down-conversion unit with the frequency conversion local oscillator signal required for frequency conversion, and the down-conversion unit mixes the received two-way horizontal polarization RF signal and the vertical polarization RF signal with the frequency conversion local oscillator signal generated by the local oscillator unit to obtain the intermediate frequency signal and amplify it; the ADC unit performs A / D sampling on the intermediate frequency signal to obtain the baseband digital radar signal, and the signal parameter measurement unit performs amplitude and phase measurement on the received baseband digital radar signal to finally obtain polarization characteristic information, that is, the amplitude difference and phase difference of the two signals, and the signal parameter measurement unit sends the output polarization characteristic information to the polarization signal simulator through the control solution module; S4. The polarization signal simulator controls and simulates the polarization characteristics of the radar echo signal, interference signal and clutter signal according to the amplitude and phase information of the two signals.

[0022] Parts of the present invention not described in detail are prior art.

[0023] The embodiments selected herein for the purpose of disclosing the invention are currently considered to be suitable, but it should be understood that the invention is intended to include all changes and modifications of the embodiments that fall within the scope of the concept and invention.

Claims

1. A polarization adaptive radio frequency simulation antenna array simulation system, comprising a receiving antenna array, a radio frequency feeding channel, a polarization characteristic measurement device and a polarization signal simulator, characterized in that: The receiving antenna array is arranged on the RF simulation antenna array array surface. The receiving antenna array and the RF feeding channel are switched by switches to achieve the selection of the receiving antenna. The RF feeding channel is connected to the polarization characteristic measurement device through signals. The output interface of the polarization characteristic measurement device is connected to the input interface of the control solution module. The control solution module receives the amplitude and phase measurement values ​​output by the polarization measurement device. The output interface of the control solution module is connected to the input interface of the polarization signal simulator.

2. The polarization adaptive radio frequency simulation antenna array simulation system according to claim 1 is characterized in that: It also includes a power supply module, which is connected to the radio frequency feeding channel and the polarization characteristic measuring device respectively.

3. The polarization adaptive radio frequency simulation antenna array simulation system according to claim 1, characterized in that: The receiving antenna array uses a dual-polarized horn antenna as an array element. The horn antenna is installed on an adjustment mechanism to ensure that the axis of the antenna points to the equipment under test.

4. The polarization adaptive radio frequency simulation antenna array simulation system according to claim 1 is characterized in that: It also includes a control solution module, the input port of which adopts a standard LVDS receiving circuit to receive the antenna pointing information of the test equipment sent by the semi-physical radio frequency simulation system through LVDS.

5. The polarization adaptive radio frequency simulation antenna array simulation system according to claim 1, characterized in that: The radio frequency feeding channel includes an equalizer A, a programmable attenuator A, an LNA low noise amplifier A, an equalizer B, an electronic switch matrix, a programmable attenuator B, an LNA low noise amplifier B and an equalizer C which are connected in sequence through signals, wherein the programmable attenuator A and the programmable attenuator B are used to adjust the link gain of the radio frequency feeding channel to avoid the low noise amplifier in the channel working in a nonlinear region due to excessive input signal power, thereby causing large amplitude and phase measurement errors; the electronic switch matrix completes the gating of the receiving antenna under the control of the control and solution module; the LNA low noise amplifier A and the LNA low noise amplifier B are used for signal attenuation compensation to ensure that the output power of the radio frequency feeding channel meets the signal detection requirements of the polarization characteristic measurement equipment.

6. The polarization adaptive radio frequency simulation antenna array simulation system according to claim 1 is characterized in that: The polarization characteristic measuring device comprises a down-conversion unit, an ADC unit, a signal parameter measuring unit and a local oscillator unit which are connected in sequence. The local oscillator unit provides the down-conversion unit with a frequency conversion local oscillator signal required for frequency conversion. The down-conversion unit mixes two received horizontally polarized radio frequency signals and vertically polarized radio frequency signals with the frequency conversion local oscillator signal generated by the local oscillator unit to obtain an intermediate frequency signal and amplify the signal. The ADC unit performs A / D sampling on the intermediate frequency signal to obtain a baseband digital radar signal. The signal parameter measuring unit performs amplitude and phase measurement on the received baseband digital radar signal to finally obtain the amplitude difference and phase difference between the two signals.

7. The method for simulating a polarization adaptive radio frequency simulation antenna array according to any one of claims 1 to 6, characterized in that: The specific steps include: S1. Arrange multiple receiving antennas with dual-polarization ports on the RF simulation antenna array to form a receiving antenna array, and design corresponding RF feeding channels to achieve gating of the receiving antennas through switch switching; S2, following the previous step, the two selected receiving antenna microwaves RH1 and RV1 are respectively selected to enter the two RF feeding channels, and the signals are modulated for the first time by the equalizer A, the programmable attenuator A, and the LNA low noise amplifier A in sequence, and the signals are then modulated for the second time by the equalizer B, the electronic switch matrix, the programmable attenuator B, and the LNA low noise amplifier B in sequence, and the modulated signals are again passed through the equalizer C to enter the polarization characteristic measurement device to achieve accurate measurement of the amplitude and phase of the horizontally polarized RF signal and the vertically polarized RF signal; S3, following the previous step, the local oscillator unit provides the down-conversion unit with the frequency conversion local oscillator signal required for frequency conversion, and the down-conversion unit mixes the received two-way horizontal polarization RF signal and the vertical polarization RF signal with the frequency conversion local oscillator signal generated by the local oscillator unit to obtain the intermediate frequency signal and amplify it; the ADC unit performs A / D sampling on the intermediate frequency signal to obtain the baseband digital radar signal, and the signal parameter measurement unit performs amplitude and phase measurement on the received baseband digital radar signal to finally obtain polarization characteristic information, that is, the amplitude difference and phase difference of the two signals, and the signal parameter measurement unit sends the output polarization characteristic information to the polarization signal simulator through the control solution module; S4. The polarization signal simulator controls and simulates the polarization characteristics of the radar echo signal, interference signal and clutter signal according to the amplitude and phase information of the two signals.

8. The polarization adaptive radio frequency simulation antenna array simulation method according to claim 7 is characterized in that: In step S3, the control solution module completes the initial value calibration measurement of the amplitude and phase characteristics of all RF feed channels before the test, and forms an initial value calibration table; during the test, according to the antenna pointing information of the test equipment and the installation positions of different receiving antennas, a suitable receiving antenna is selected, the switch control word in the RF feed channel is solved, and the selected receiving antenna is selected; according to the signal amplitude information output by the polarization characteristic measurement device, the working state of the RF feed channel is judged, and the amplitude control code is output to adjust the overall gain of the RF feed channel to ensure that the RF feed channel works in the linear region; after the working state of the RF feed channel is adjusted, the amplitude and phase measurement results output by the polarization characteristic measurement device are received, and the polarization characteristic information of the signal is output to the polarization signal simulator in combination with the calibration data.

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