A multi-functional radar signal simulation method of arbitrary polarization modulation and polarization combination

Abstract

This invention provides a multifunctional radar signal simulation method with arbitrary polarization modulation and polarization combination. The polarization mode is changed by adjusting the amplitude and phase of the signal generated by the V-path of the H-path. The entire link is divided into two independent channels, the H-path and the V-path. The signal output of the two channels are respectively connected to the horizontal polarization port and the vertical polarization port of the dual-polarization antenna, forming the basis of orthogonal polarization processing. Two intermediate frequency signals are generated by the FPGA. When the intermediate frequency signals pass through the up-conversion link of the microwave unit, the power and phase of the two paths are adjusted so that the horizontal and vertical components of the orthogonal polarization base have a certain power ratio and phase difference, realizing the full polarization domain polarization processing function. This method uses multiple sets of radio frequency switching switches. By cleverly utilizing the switch combinations, it is possible to realize various polarization combinations for radar signal, target echo simulation, and interference signal simulation. These combinations can be combinations of the same polarization, combinations of orthogonal polarization, or combinations of arbitrary polarization.

Description

Technical Field

[0001] This invention relates to the field of radar signal simulation, and more specifically, to a multifunctional radar signal simulation method with arbitrary polarization modulation and polarization combination. Background Technology

[0002] With the continuous development of science and technology, the equipment level of our military is constantly improving, and the qualitative testing of equipment has become a key issue. Under information warfare conditions, the electromagnetic environment of the modern battlefield is becoming increasingly complex, and its diversity is mainly reflected in three aspects: 1. Diverse signal forms, large quantity, and high distribution density. Various new radar systems use more complex signal forms and are widely used in modern battlefields, especially in important military assembly areas where radar distribution is very dense. 2. Wide signal distribution range and severe signal overlap. The development of electronic technology has made the electromagnetic spectrum occupied by electromagnetic signals on the battlefield increasingly wider, almost covering the entire electromagnetic signal frequency band. The average number of pulse signals appearing per unit time is at least tens of thousands, and sometimes millions, with multiple signals possibly appearing simultaneously with severe overlap. 3. Complex signal modulation and variable parameters. With the development of signal generation and processing technologies, weapons and equipment can often generate waveforms with various modulation characteristics as needed. In addition, many devices can change the carrier frequency, pulse waveform, or other modulation parameters of the transmitted signal; the time of such changes may be several seconds or tens of milliseconds.

[0003] Currently, there are three methods for constructing complex electromagnetic environments: real equipment construction, simulator construction, and computer simulation construction. Simulator construction utilizes simulators to generate signals to simulate electromagnetic signals and construct complex electromagnetic environments. This method can generate targeted electromagnetic environments, and different electromagnetic environments can be flexibly simulated by adjusting parameters. It is relatively simple, effective, dynamic, inexpensive, and easy to operate.

[0004] Radar signal simulators and jammers play a crucial role in constructing complex electromagnetic environments for equipment training and performance evaluation. However, current radar signal simulators and jammers generally only construct complex electromagnetic environments in three dimensions: airspace, frequency domain, and energy domain. Furthermore, numerous radar anti-jamming methods have emerged targeting these three dimensions, necessitating alternative approaches to radar jamming.

[0005] Therefore, we propose a multifunctional radar signal simulation method based on arbitrary polarization modulation and polarization combination. This method can achieve arbitrary synthesis of interference signal polarization directions and can also be used as both a radar signal simulator and a radar target simulator. Unlike traditional equipment, the polarization mode can be switched arbitrarily, enabling the design and implementation of principle verification experiments and performance evaluation experiments for polarization interference. This method has significant theoretical and practical application value for interference experiments on radar main lobe and sidelobe, and for evaluating interference effectiveness. Summary of the Invention

[0006] The purpose of this invention is to address the problems raised in the existing background technology. To achieve the above-mentioned objective, this invention provides the following technical solution: a multi-functional radar signal simulation method with arbitrary polarization modulation and polarization combination, comprising the following steps: Step one, when controlling the polarization mode of the device, a dual-polarized antenna is selected, and the polarization mode is changed by adjusting the amplitude and phase of the signal generated by the V-path of the H-path; the entire link is divided into two independent channels, the H-path and the V-path, and the signal outputs of the two channels are respectively connected to the horizontal polarization port and the vertical polarization port of the dual-polarized antenna for orthogonal polarization processing; Step 2: Phase modulation is performed in the microwave module through a phase shifter. The digital module generates two intermediate frequency signals in the FPGA according to the phase parameters sent by the host computer. When the intermediate frequency signals pass through the up-conversion link of the microwave unit, their amplitude is modulated by the digitally controlled attenuator in the link. The attenuation value of the digitally controlled attenuator is adjusted by the digital module. Step 3: The phase of the link is modulated by a phase shifter, and the phase shift value of the phase shifter is adjusted by a digital module. By adjusting the power and phase of the two paths, the horizontal and vertical components of the orthogonal polarization base have a certain power ratio and phase difference, thereby realizing the full polarization domain polarization processing function.

[0007] As a preferred technical solution of the present invention, in step four, the rapid switching between vertical polarization, horizontal polarization and orthogonal polarization is completed according to different combinations of switches; in addition, after the amplitude and phase are modulated by the digital module, the two independent channels are combined to achieve arbitrary polarization.

[0008] As a preferred technical solution of the present invention, in step five, the two uplinks of the microwave unit are completely independent, and the digital module contains two completely independent FPGA chips, which are used to generate analog radar signals (analog target signals) and interference signals respectively; the two channels are set to generate signals simultaneously on the host computer, and only one channel is controlled to generate signals separately; the variable polarization interference signal is set on the host computer, and the fixed conventional polarization interference is used for the test.

[0009] As a preferred technical solution of the present invention, step six, polarization reception, is performed by receiving external signals through a dual-polarized antenna. After decomposition, the signals are simultaneously input to the microwave via two radio frequency inputs from the H port and V port. The microwave signals are down-converted to intermediate frequency and then input to the digital AD1 and AD2. The two AD signals are measured simultaneously. The amplitude and instantaneous phase are calculated through the IQ signals of H and V, and the amplitude ratio and phase difference of H and V are obtained, thereby completing the polarization measurement. The AD1 channel is used only for measurement, while the AD2 channel, in addition to measurement, also stores the radar signal and sends it to DA1 and DA2 to generate the transmission signal.

[0010] As a preferred technical solution of the present invention, step seven is polarization emission, which includes a) interference polarization and b) radiation source polarization.

[0011] As a preferred technical solution of the present invention, the interference polarization includes the following process: S1: DA1 generates an interference signal; S2: After being split into two by a microwave power divider, two signals are formed. These signals are then combined, and their amplitude and phase are adjusted by a phase shifter and an attenuator before being sent to the power amplifiers respectively. S3: RF signal H1 is sent to antenna H1 after passing through power amplifier 1; RF signal V1 is sent to antenna V1 after passing through power amplifier 2; S4: After the two signals converge into the H1V1 dual-polarized antenna, they form a polarization of the interference signal in space.

[0012] As a preferred technical solution of the present invention, the polarization of the b radiation source includes the following process: S1: DA2 outputs target / radiation source signal; S2: After being split into two by a microwave power divider, two signals are formed. These signals are then combined, and their amplitude and phase are adjusted by a phase shifter and an attenuator before being sent to the power amplifiers respectively. S3: RF signal V2 is sent to antenna V2 after passing through power amplifier 1; RF signal H2 is sent to antenna H2 after passing through power amplifier 2; S4: After the two signals converge into the H2V2 dual-polarized antenna, they form a polarization of the target / radiation source signal in space.

[0013] As a preferred technical solution of the present invention, step eight is non-polarization transmission, which completes the combination of interference, target / radiation source, and single polarization mode of interference and target / radiation source in a non-polarization scenario.

[0014] As a preferred technical solution of the present invention, step eight, non-polarization transmission is completed through the following steps in conjunction with link switching: S1: DA1 outputs interference, DA2 outputs target / radiation source; S2: After being split into two by a microwave power divider, four signals are generated. These signals are then switched by a switch and sent to a power amplifier via a combiner to form the required radio frequency signals.

[0015] As a preferred technical solution of the present invention, step eight, non-polarization transmission includes the polarization mode when each channel is used individually and the link polarization mode when two channels are combined; The polarization method for each individual channel is as follows: the RF signal H1 travels through the link channel and is sent to the H1 antenna via power amplifier 1, generating horizontal polarization for interference; the RF signal V1 travels through the link channel and is sent to the V1 antenna via power amplifier 2, generating vertical polarization for interference; the RF signal V2 travels through the link channel and is sent to the V2 antenna via power amplifier 1, generating vertical polarization for the target / radiation source; the RF signal H2 travels through the link channel and is sent to the H2 antenna via power amplifier 2, generating horizontal polarization for the target / radiation source. The link polarization methods for the two-channel combinations are as follows: Channel H1 and V2 combination: DA1 (interference) generates horizontal polarization through channel H1; DA2 (target / radiation source) generates vertical polarization through channel V2; Channel H1 and H2 combination: DA1 (interference) generates horizontal polarization through channel H1; DA2 (target / radiation source) generates horizontal polarization through channel H2; Channel V1 and V2 combination: DA1 (interference) generates vertical polarization through channel V1; DA2 (target / radiation source) generates vertical polarization through channel V2; Channel V1 and H2 combination: DA1 (interference) generates vertical polarization through channel V1; DA2 (target / radiation source) generates horizontal polarization through channel H2.

[0016] Compared with existing technologies, the beneficial effects of this invention are as follows: In the solution of this invention, the polarization mode is changed by adjusting the amplitude and phase of the signal generated by the V-path of the H-path. In the device design, the entire link is divided into two independent channels, the H-path and the V-path. The signal outputs of the two channels are respectively connected to the horizontal polarization port and the vertical polarization port of the dual-polarized antenna, forming the basis of orthogonal polarization processing. Phase modulation is performed in the microwave module through a phase shifter. The digital module generates two intermediate frequency (IF) signals in the FPGA according to the phase parameters sent by the host computer. When the IF signals pass through the up-conversion link of the microwave unit, their amplitude is modulated by the digitally controlled attenuator in the link, and the attenuation value of the digitally controlled attenuator is adjusted by the digital module; their phase is modulated by the phase shifter in the link, and the phase shift value of the phase shifter is adjusted by the digital module. By adjusting the power and phase of the two paths, the horizontal and vertical components of the orthogonal polarization base have a certain power ratio and phase difference, realizing the full polarization domain polarization processing function. Attached Figure Description

[0017] Figure 1 This invention provides a link block diagram for interference polarization. Figure 2 This invention provides a link block diagram for target / radiation source polarization. Figure 3 This is a schematic diagram of interference horizontal polarization provided by the present invention; Figure 4 This is a schematic diagram of interference vertical polarization provided by the present invention; Figure 5This is a schematic diagram of the vertical polarization of the target / radiation source provided by the present invention; Figure 6 This is a schematic diagram of the horizontal polarization of the target / radiation source provided by the present invention; Figure 7 This is a block diagram of the combination of channels 1 and 3 provided by the present invention; Figure 8 This is a block diagram of the combination of channels 1 and 4 provided by the present invention; Figure 9 This is a block diagram of the combination of channels 2 and 3 provided by the present invention; Figure 10 This is a block diagram of the combination of channels 2 and 4 provided by the present invention; Figure 11 A block diagram illustrating the principle of amplitude and phase modulation provided by this invention; Figure 12 The polarization diagram of each channel combination in the non-polarization scenario provided by the present invention; Figure 13 This is an arbitrary polarization synthesis diagram provided by the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] Example 1: Please refer to Figure 1-13 A multi-functional radar signal simulation method with arbitrary polarization modulation and polarization combination includes the following steps: Step 1, when controlling the polarization mode of the device, a dual-polarized antenna is selected, and the polarization mode is changed by adjusting the amplitude and phase of the signal generated by the V path of the H path; the entire link is divided into two independent channels, the H path and the V path, and the signal output of the two channels are respectively connected to the horizontal polarization port and the vertical polarization port of the dual-polarized antenna for orthogonal polarization processing; Step 2: Phase modulation is performed in the microwave module through a phase shifter. The digital module generates two intermediate frequency signals in the FPGA according to the phase parameters sent by the host computer. When the intermediate frequency signals pass through the up-conversion link of the microwave unit, their amplitude is modulated by the digitally controlled attenuator in the link. The attenuation value of the digitally controlled attenuator is adjusted by the digital module. Step 3: The phase of the link is modulated by a phase shifter, and the phase shift value of the phase shifter is adjusted by a digital module. By adjusting the power and phase of the two paths, the horizontal and vertical components of the orthogonal polarization base have a certain power ratio and phase difference, thereby realizing the full polarization domain polarization processing function.

[0021] Step four: Based on different combinations of switches, the rapid switching between vertical polarization, horizontal polarization, and orthogonal polarization is completed; in addition, through the modulation of amplitude and phase by the digital module, the two independent channels are combined to achieve arbitrary polarization.

[0022] Step 5: The two uplinks of the microwave unit are completely independent, and the digital module contains two completely independent FPGA chips, which are used to generate analog radar signals (analog target signals) and interference signals respectively; the two channels are set to generate signals simultaneously on the host computer, and only one channel is controlled to generate signals independently; the variable polarization interference signal is set on the host computer, and the fixed conventional polarization interference is used for the test.

[0023] Step 6, polarization reception: External signals are received through a dual-polarized antenna. After decomposition, the signals are simultaneously input to the microwave via two RF inputs from the H port and V port. The microwave signals are down-converted to intermediate frequency and then input to the digital AD1 and AD2. The two AD inputs are measured simultaneously. The amplitude and instantaneous phase of each signal are obtained from the IQ signals of H and V, and the amplitude ratio and phase difference of H and V are obtained, thus completing the polarization measurement. The AD1 channel is used only for measurement, while the AD2 channel, in addition to measurement, also stores the radar signal and sends it to DA1 and DA2 to generate the transmission signal.

[0024] Step 7, polarization emission, which includes a) interference polarization and b) radiation source polarization.

[0025] Interference polarization includes the following processes: S1: DA1 generates an interference signal; S2: After being split into two by a microwave power divider, two signals are formed. These signals are then combined, and their amplitude and phase are adjusted by a phase shifter and an attenuator before being sent to the power amplifiers respectively. S3: RF signal H1 is sent to antenna H1 after passing through power amplifier 1; RF signal V1 is sent to antenna V1 after passing through power amplifier 2; S4: After the two signals converge into the H1V1 dual-polarized antenna, they form a polarization of the interference signal in space.

[0026] b. Radiation source polarization includes the following processes: S1: DA2 outputs target / radiation source signal; S2: After being split into two by a microwave power divider, two signals are formed. These signals are then combined, and their amplitude and phase are adjusted by a phase shifter and an attenuator before being sent to the power amplifiers respectively. S3: RF signal V2 is sent to antenna V2 after passing through power amplifier 1; RF signal H2 is sent to antenna H2 after passing through power amplifier 2; S4: After the two signals converge into the H2V2 dual-polarized antenna, they form a polarization of the target / radiation source signal in space.

[0027] Step 8, Non-polarization transmission: In a non-polarization scenario, the combination of jamming, target / radiation source, and single polarization modes of jamming and target / radiation source is completed.

[0028] Step 8, non-polarization transmission is completed through the following steps in conjunction with link switching: S1: DA1 outputs interference, DA2 outputs target / radiation source; S2: After being split into two by a microwave power divider, four signals are generated. These signals are then switched by a switch and sent to a power amplifier via a combiner to form the required radio frequency signals.

[0029] Step 8, non-polarization transmission includes the polarization mode when each channel is used individually and the link polarization mode when two channels are combined; The polarization method for each individual channel is as follows: the RF signal H1 travels through the link channel and is sent to the H1 antenna via power amplifier 1, generating horizontal polarization for interference; the RF signal V1 travels through the link channel and is sent to the V1 antenna via power amplifier 2, generating vertical polarization for interference; the RF signal V2 travels through the link channel and is sent to the V2 antenna via power amplifier 1, generating vertical polarization for the target / radiation source; the RF signal H2 travels through the link channel and is sent to the H2 antenna via power amplifier 2, generating horizontal polarization for the target / radiation source. The link polarization methods for the two-channel combinations are as follows: Channel H1 and V2 combination: DA1 (interference) generates horizontal polarization through channel H1; DA2 (target / radiation source) generates vertical polarization through channel V2; Channel H1 and H2 combination: DA1 (interference) generates horizontal polarization through channel H1; DA2 (target / radiation source) generates horizontal polarization through channel H2; Channel V1 and V2 combination: DA1 (interference) generates vertical polarization through channel V1; DA2 (target / radiation source) generates vertical polarization through channel V2; Channel V1 and H2 combination: DA1 (interference) generates vertical polarization through channel V1; DA2 (target / radiation source) generates horizontal polarization through channel H2.

[0030] In this invention, to control the polarization of the device, a dual-polarized antenna is used. The polarization is changed by adjusting the amplitude and phase of the signal generated by the V-path of the H-path. In the device design, the entire link is divided into two independent channels, H-path and V-path. The signal outputs of the two channels are respectively connected to the horizontal and vertical polarization ports of the dual-polarized antenna, forming the basis for orthogonal polarization processing. Phase modulation is performed in the microwave module using a phase shifter. The digital module generates two intermediate frequency (IF) signals in the FPGA based on the phase parameters sent by the host computer. When the IF signals pass through the up-conversion link of the microwave unit, their amplitude is modulated by a digitally controlled attenuator in the link, and the attenuation value of the digitally controlled attenuator is adjusted by the digital module. Their phase is modulated by a phase shifter in the link, and the phase shift value of the phase shifter is adjusted by the digital module. By adjusting the power and phase of the two paths, the horizontal and vertical components of the orthogonal polarization base have a certain power ratio and phase difference, achieving full polarization domain polarization processing.

[0031] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A multi-functional radar signal simulation method of arbitrary polarization modulation and polarization combination, characterized in that, Includes the following steps: Step 1: When controlling the polarization mode of the device, select a dual-polarized antenna and change the polarization mode by adjusting the amplitude and phase of the signal generated by the V-path of the H-path. The entire link is divided into two independent channels, the H-path and the V-path. The signal output of the two channels are respectively connected to the horizontal polarization port and the vertical polarization port of the dual-polarized antenna for orthogonal polarization processing. Step 2: Phase modulation is performed in the microwave module through a phase shifter. The digital module generates two intermediate frequency signals in the FPGA according to the phase parameters sent by the host computer. When the intermediate frequency signals pass through the up-conversion link of the microwave unit, their amplitude is modulated by the digitally controlled attenuator in the link. The attenuation value of the digitally controlled attenuator is adjusted by the digital module. Step 3: The phase of the link is modulated by a phase shifter, and the phase shift value of the phase shifter is adjusted by a digital module. By adjusting the power and phase of the two paths, the horizontal and vertical components of the orthogonal polarization base have a certain power ratio and phase difference, thereby realizing the full polarization domain polarization processing function. Step four: Based on different combinations of switches, rapid switching between vertical polarization, horizontal polarization, and orthogonal polarization is achieved; in addition, through the modulation of amplitude and phase by the digital module, arbitrary polarization is achieved by combining two independent channels. Step 5: The two uplinks of the microwave unit are completely independent, and the digital module contains two completely independent FPGA chips, which are used to generate analog radar signals and jamming signals respectively; the two channels are set to generate signals simultaneously on the host computer, and only one channel is controlled to generate signals independently; the variable polarization jamming signal is set on the host computer, and the fixed conventional polarization jamming is used for the test. Step 6, polarization reception: External signals are received through a dual-polarized antenna. After decomposition, the signals are simultaneously input to the microwave via two RF inputs from the H port and V port. The microwave signals are down-converted to intermediate frequency and then input to the digital AD1 and AD2. The two AD inputs are measured simultaneously. The amplitude and instantaneous phase of each signal are obtained from the IQ signals of H and V, and the amplitude ratio and phase difference of H and V are obtained, thus completing the polarization measurement. The AD1 channel is used only for measurement, while the AD2 channel, in addition to measurement, also stores the radar signal and sends it to DA1 and DA2 to generate the transmission signal. Step 7, polarization emission, which includes a) interference polarization and b) radiation source polarization; Interference polarization includes the following processes: S1: DA1 generates an interference signal; S2: After being split into two by a microwave power divider, two signals are formed. These signals are then combined, and their amplitude and phase are adjusted by a phase shifter and an attenuator before being sent to the power amplifiers respectively. S3: RF signal H1 is sent to antenna H1 after passing through power amplifier 1; RF signal V1 is sent to antenna V1 after passing through power amplifier 2; S4: After the two signals converge into the H1V1 dual-polarized antenna, they form a polarization of the interference signal in space; b. Radiation source polarization includes the following processes: S1: DA2 outputs target / radiation source signal; S2: After being split into two by a microwave power divider, two signals are formed. These signals are then combined, and their amplitude and phase are adjusted by a phase shifter and an attenuator before being sent to the power amplifiers respectively. S3: RF signal V2 is sent to antenna V2 after passing through power amplifier 1; RF signal H2 is sent to antenna H2 after passing through power amplifier 2; S4: After the two signals converge into the H2V2 dual-polarized antenna, they form a polarization of the target / radiation source signal in space; Step 8, Non-polarization transmission: In a non-polarization scenario, complete the combination of single polarization modes of jamming, target / radiation source, jamming, and target / radiation source. Non-polarization transmission is accomplished through the following steps in conjunction with link switching: S1: DA1 outputs interference, DA2 outputs target / radiation source; S2: After being split into two by a microwave power divider, four signals are formed. These signals are then switched by a switch and sent to a power amplifier via a combiner to form the required radio frequency signals. Non-polarization transmission includes the polarization mode when each channel is used individually and the link polarization mode when two channels are combined; The polarization method for each channel when used individually is as follows: the radio frequency signal H1 travels through the link channel and is sent to the H1 antenna via power amplifier 1, generating horizontal polarization for interference; the radio frequency signal V1 travels through the link channel and is sent to the V1 antenna via power amplifier 2, generating vertical polarization for interference. Radio frequency signal V2 travels through the link channel and is sent to antenna V2 via power amplifier 1 to generate the vertical polarization of the target / radiation source; radio frequency signal H2 travels through the link channel and is sent to antenna H2 via power amplifier 2 to generate the horizontal polarization of the target / radiation source. The link polarization methods for the two-channel combination are as follows: Channel H1 and V2 combination: DA1 generates horizontal polarization through channel H1; DA2 generates vertical polarization through channel V2; Channel H1 and H2 combination: DA1 generates horizontal polarization through channel H1; DA2 generates horizontal polarization through channel H2; Channel V1 and V2 combination: DA1 generates vertical polarization through channel V1. DA2 generates vertical polarization through channel V2; the combination of channels V1 and H2: DA1 generates vertical polarization through channel V1; DA2 generates horizontal polarization through channel H2.

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