Wireless light coherent radar bait device and use method

Abstract

The invention belongs to the field of radar decoy, and particularly relates to a wireless light coherent radar decoy device and a use method. Waveform generation is placed in a wireless bait station, a handheld synchronization device is used for collecting a synchronous clock of a radar, the working frequency of a phase-locked loop is locked, then frequency division is carried out to the synchronous clock frequency of the radar, a cable interface between the device and the radar is disconnected, and the device is carried to the wireless bait station to serve as a forwarded synchronous clock. And a deviation inducing signal emitted by the coherent synchronization wireless bait station is obtained. According to the invention, the extra design difficulty caused by using an optical interface is reduced, the erection difficulty caused by using a large coiled field operation optical cable is also reduced, and the extra cost caused by using an optical transceiver and the field operation optical cable is also reduced.

Description

Technical Field

[0001] The invention belongs to the field of radar decoys, and in particular relates to a wireless lightweight coherent radar decoy device and a use method thereof. Background Art

[0002] With the large-scale use of anti-radiation missiles (ARM), the battlefield survival environment of radars has become increasingly harsh. At the beginning of a war, the attacker will give priority to attacking radars to make the enemy lose its air defense capabilities. As the core equipment of the defense system, radar is irreplaceable. Once it is destroyed by the enemy, the entire defense system will lose most of its defense capabilities. Radars have complex structures, are difficult to operate, and are expensive. There are not many radars deployed on the battlefield, and even if only one is lost, it is difficult to accept. Equipping a decoy system is one of the effective means for radars to deal with the threat of anti-radiation missiles (ARM).

[0003] Decoy devices are divided into coherent decoys and non-coherent decoys. Coherent decoys have better decoy effects than non-coherent decoys, but coherent decoys are more difficult to implement than non-coherent decoys. Coherent decoys need to transmit coherent RF signals to the decoy devices. When RF cables are used to transmit RF signals over long distances, the power attenuation of RF signals will be greatly increased, and the signal-to-noise ratio will be seriously deteriorated, which may eventually cause the decoy devices to fail to work properly. If wireless transmission is used between radars and decoys, the complex electromagnetic environment of the battlefield will make wireless signals unreliable, which may also cause the decoy devices to fail to work properly.

[0004] In order to improve reliability and reduce the difficulty of implementation, traditional coherent decoys generally install a radio frequency optical transmitter in the radar to convert the decoy excitation signal generated by the radar into an optical signal, which is then forwarded to the decoy device through optical fiber. The radio frequency optical receiver in the decoy device receives the optical signal and converts it into a decoy excitation signal, which is then amplified and transmitted. When coherent decoys are used, they need to be equipped with long optical fibers. The length and weight of the optical fibers severely limit the installation of decoy equipment. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a wireless lightweight coherent radar decoy device and a method of use. The present invention places the waveform generator inside the wireless decoy station, uses a handheld synchronization device to collect the radar's synchronization clock, locks it to the operating frequency of the phase-locked loop, and then divides it to the radar's synchronization clock frequency. After disconnecting the cable interface between the device and the radar and carrying it to the wireless decoy station, it is used as a forwarded synchronization clock to coherently synchronize the decoy signal emitted by the wireless decoy station. The present invention also uses the device to receive the radar's decoy control command, stores it in the device's internal FPGA, and after being transported to the wireless decoy station, uses it as a forwarded decoy control command to control the working state of the wireless decoy station.

[0006] The technical solution of the present invention is: a wireless light coherent radar decoy device, including a handheld synchronization device and a wireless decoy station, the handheld synchronization device and the wireless decoy station are provided with a radio frequency interface and a communication interface, characterized in that:

[0007] The handheld synchronization device includes an RF input interface, an RF output interface, a communication input interface, a communication output interface, an RF switching switch, a clock phase-locked distribution chip, an FPGA, a crystal oscillator, a touch screen, and a battery; the RF input interface receives the synchronous clock of the radar, the communication input interface receives the decoy control command of the radar, the RF output interface outputs the forwarded synchronous clock to the wireless decoy station, and the communication output interface outputs the forwarded decoy control command to the wireless decoy station; the RF switching switch is used to switch the reference clock source of the clock phase-locked distribution chip; the clock phase-locked distribution chip has a built-in phase-locked loop to complete clock phase locking and frequency division;

[0008] The FPGA of the handheld synchronization device includes a command control forwarding module, a clock latch module and a clock switching module; the command control forwarding module is used to process the touch input instructions of the touch screen and send the operation completion status to the touch screen as a display output, while collecting, storing and forwarding the radar's decoy control commands; the clock latch module sends clock control data to the clock phase-locked distribution chip of the handheld synchronization device according to the touch input requirements, completing the locking, storage and forwarding of the radar's synchronous clock; the clock switching module controls the RF switching switch to switch the reference clock source of the clock phase-locked distribution chip;

[0009] The wireless bait station includes a wireless light bait and a generator; the wireless light bait includes a waveform generator, a power amplifier module, an omnidirectional antenna, a fan, and a bait compartment; the waveform generator includes a radio frequency interface and a communication interface, the waveform generator adopts a radio frequency direct transmission mode, and the power amplifier module uses a GaN power amplifier chip for amplification; the omnidirectional antenna is equipped with a protective antenna cover; the fan cooperates with the air duct to complete the forced air cooling heat dissipation in the wireless light bait; the bait compartment is equipped with a shutter with a dustproof net;

[0010] The FPGA for waveform generation inside the wireless light decoy includes a control command parsing module, a clock configuration module, a synchronization control module and a waveform data generation module; the control command parsing module is used to parse the decoy control command forwarded by the handheld synchronization device to obtain the corresponding periodic synchronization pulse, wave control code, waveform code and frequency code; the clock configuration module sends the clock configuration data to the clock phase-locked distribution chip inside the waveform generation, so that the phase-locked loop inside the clock phase-locked distribution chip completes the phase locking and frequency division of the reference clock source, and then sends a selection signal to the RF switching switch to switch the reference clock source of the clock phase-locked distribution chip, and finally outputs the working clock and DAC clock that are coherent with the radar; the synchronization control module generates the start time of the radar cycle according to the periodic synchronization pulse as the timing reference for generating DAC data; the waveform data generation module generates DAC data according to the wave control code, waveform code and frequency code, and outputs it according to the timing requirements.

[0011] According to the wireless lightweight coherent radar decoy device as described above, it is characterized in that the working process of the handheld synchronization device locking, storing and forwarding the synchronization clock of the radar includes the following steps:

[0012] Step 1: How to lock the radar's synchronization clock with the handheld synchronization device:

[0013] The clock phase-locked distribution chip inside the handheld synchronization device first uses the 100MHz synchronization clock of the external radar as the reference clock source, and locks the operating frequency of its internal phase-locked loop to 2000MHz through control, and then divides the frequency to 100MHz and outputs it to the outside of the chip in three ways, of which the first way is output as a latched clock to the RF switch, the second way is output as a device clock to the FPGA, and the third way is output as a forwarded 100MHz synchronization clock;

[0014] Step 2: The steps for storing the radar's synchronization clock in the handheld synchronization device:

[0015] After receiving the 100MHz device clock, the FPGA inside the handheld synchronization device controls the RF switch to switch the reference clock source of the clock phase-locked distribution chip from the external input radar synchronization clock to the 100MHz latched clock inside the device itself. The clock phase-locked distribution chip uses the new clock as the reference clock source, locks the operating frequency of the internal phase-locked loop to 2000MHz, and updates the three clock outputs of the chip.

[0016] Step 3: The waveform generated in the wireless bait station locks the synchronization clock forwarded by the handheld synchronization device:

[0017] The internal clock phase-locked distribution chip of the waveform generation first uses the 100MHz synchronization clock forwarded by the handheld synchronization device as the reference clock source, and controls the operating frequency of the internal phase-locked loop of the clock phase-locked distribution chip to be locked to 2000MHz, and then divided into two paths and divided into 100MHz and 1000MHz respectively. The signal after the frequency division to 100MHz is also divided into two paths, of which the first path is output as a self-locking clock to the RF switching switch inside the waveform generation, and the second path is output as the working clock to the FPGA, and the signal divided to 1000MHz is output to the DAC chip as the DAC clock;

[0018] Step 4: The waveform in the wireless decoy station generates and stores the synchronization clock forwarded by the handheld synchronization device:

[0019] The FPGA inside the waveform generator receives a 100MHz working clock. After pressing the synchronization output option on the touch screen of the handheld synchronization device, the RF switch is controlled to switch the reference clock source of the clock phase-locked distribution chip from the synchronization clock forwarded by the external handheld synchronization device to the 100MHz self-locked clock inside the device itself. The clock phase-locked distribution chip uses the new clock as the reference clock source and still locks the operating frequency of the internal phase-locked loop to 2000MHz, and updates the clock outputs of each channel of the chip. At this time, the clock phase-locked distribution chip is self-locked.

[0020] According to the wireless lightweight coherent radar decoy device as described above, it is characterized in that the radio frequency interface and the communication interface of the handheld synchronization device and the wireless decoy station are integrated into one aviation plug.

[0021] According to the wireless lightweight coherent radar decoy device as described above, it is characterized in that the power consumption of the generator is less than or equal to 500W.

[0022] According to the wireless lightweight coherent radar decoy device as described above, it is characterized in that the waveform generation and power amplifier module of the wireless decoy station form a power component.

[0023] The present invention also discloses a method for using a wireless lightweight coherent radar decoy device, which is characterized by comprising the following steps:

[0024] Step 1. The steps of collecting and storing the synchronous clock and decoy control commands of the radar by the handheld synchronization device: the wireless decoy station is arranged at the preset position to complete the installation; after the radar is turned on, the transmission is not started temporarily, and the operator carries the handheld synchronization device to the radar, connects the RF interface of the radar with the RF input interface of the handheld synchronization device, and the communication interface of the radar with the communication input interface of the handheld synchronization device with a cable, presses the synchronization input option on the touch screen of the handheld synchronization device, controls it to lock and store the synchronous clock frequency of the radar with the internal phase-locked loop, and collects and stores the decoy control commands of the radar with the FPGA, waits for the locking and storage of the synchronous clock and the collection and storage of the decoy control commands to be completed and displayed on the touch screen of the handheld synchronization device, and then unplugs the connecting cable;

[0025] Step 2, the handheld synchronization device forwards the synchronization clock and bait control command of the radar to the wireless bait station: the operator carries the handheld synchronization device to the wireless bait station, uses a cable to connect the RF interface of the wireless bait station with the RF output interface of the handheld synchronization device, and the communication interface of the wireless bait station with the communication output interface of the handheld synchronization device, presses the synchronization output option on the touch screen of the device, controls the device to output the forwarded synchronization clock to the wireless bait station, and also outputs the collected bait control command to the wireless bait station;

[0026] Step three, the wireless decoy station transmits the corresponding decoy signal according to the decoy control command and completes the normal operation of the decoy system: wait for the wireless decoy station to lock with the phase-locked loop generated by its internal waveform, store the synchronization clock frequency forwarded by the handheld synchronization device, and use FPGA to collect and store the decoy control command forwarded by the handheld synchronization device, and then display the synchronization completion status on the touch screen of the handheld synchronization device; the phase-locked loop generated by the waveform inside the wireless decoy station generates a working clock and DAC clock coherent with the radar through the locked frequency, and the FPGA generated by the waveform completes the time calibration through the rising edge of the periodic synchronization pulse in the decoy control command, and completes the type selection, timing control and frequency switching of the waveform emitted by the decoy according to the wave control code, waveform code and frequency code in the decoy control command; after the wireless decoy station starts transmitting, turn on the radar.

[0027] According to the method for using a wireless lightweight coherent radar decoy device as described above, it is characterized in that the radar decoy control command includes a synchronization pulse, a wave control code, a waveform code and a frequency code.

[0028] The beneficial effects of the present invention are as follows: since no optical interface is used, there is no need for an optical terminal and field optical cable required for long-distance transmission and reception of optical signals, and there is no need to install an optical module on the internal PCB board of the bait device, which reduces the additional design difficulty caused by the use of an optical interface, reduces the difficulty in installing a large-scale field optical cable, and reduces the additional cost introduced by the use of an optical terminal and a field optical cable; the power amplifier module of the wireless bait station has a high conversion efficiency, and the required power supply power does not need to be very large, a lightweight gasoline generator can be used, and a lot of fuel does not need to be carried, the size and weight of the wireless light coherent radar bait device can be controlled, and at the same time the handheld synchronization device is small in size and equipped with a power supply. The cable is short, so the weight of the whole device can be controlled within 80kg. It can be transported by a micro vehicle, and two people can easily complete the transportation and installation. If there is no vehicle, the whole device can be disassembled into several parts, and four people can also complete the transportation and installation. Due to the low difficulty of installation, it is convenient to network and install multiple sets of bait devices according to combat tasks to improve the decoy effect. The bait device is coherent with the radar and is equipped with a portable generator, so it can work wirelessly and independently. Considering the low cost of the bait device, when using a vehicle-mounted radar, the bait device can also be left in place to continue to maintain the decoy effect in the event of a threat, and the radar can be quickly withdrawn and the personnel can be evacuated to ensure the safety of the radar equipment and users. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the system principle block diagram.

[0030] Figure 2 Create a block diagram for the waveform generation.

[0031] Figure 3This is the structure diagram of the digital module in the FPGA of the handheld synchronization device.

[0032] Figure 4 This is the digital module structure diagram within the FPGA that generates the waveform.

[0033] Figure 5 The flowchart is for the use of wireless lightweight coherent radar decoy device.

[0034] Figure 6 This is a block diagram of the radar's synchronous clock locking, storage and forwarding. DETAILED DESCRIPTION

[0035] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0036] like Figure 1 As shown, the hardware of the present invention includes a handheld synchronization device and a wireless bait station, both of which have a radio frequency interface and a communication interface. The radio frequency interface and the communication interface can be integrated into an aviation plug that supports quick plugging and unplugging for easy connection.

[0037] The handheld synchronization device includes an RF input interface, an RF output interface, a communication input interface, a communication output interface, an RF switch, a clock phase-lock distribution chip, an FPGA, a crystal oscillator, a touch screen, and a battery. The RF input interface receives the synchronous clock of the radar, the communication input interface receives the decoy control command of the radar, the RF output interface outputs the forwarded synchronous clock to the wireless decoy station, and the communication output interface outputs the forwarded decoy control command to the wireless decoy station. The RF switch is used to switch the reference clock source of the clock phase-lock distribution chip. The clock phase-lock distribution chip has a built-in phase-locked loop to complete clock phase locking and frequency division. FPGA generally chooses the A7 series of XILINX with a high cost performance. The crystal oscillator is only used to provide the local clock of the FPGA, and generally uses a commonly used 100MHz or similar output frequency chip crystal oscillator. The touch screen is used for simple operations and displays the corresponding status. When selecting, it is necessary to consider the adaptable ambient temperature, and it can also be replaced by a display screen plus buttons. The battery chooses a commonly used rechargeable battery.

[0038] The wireless bait station includes a wireless light bait and a portable generator. The wireless light bait includes a waveform generator, a power amplifier module, an omnidirectional antenna, a fan, and a bait compartment. The waveform generator includes a radio frequency interface and a communication interface. The internal hardware is similar to the handheld synchronization device, but without a touch screen and a battery, and with an additional DAC chip for waveform generation. For a detailed block diagram, see Figure 2. The waveform generation and power amplifier module can be assembled together to form a power component. The waveform generation adopts the RF direct transmission mode, and the power amplifier module uses a GaN power amplifier chip for amplification. The omnidirectional antenna is equipped with a protective antenna cover to protect against rain, wind and dust in the wild. The fan cooperates with the air duct to complete the forced air cooling in the wireless light bait. The bait compartment is equipped with a shutter with a dustproof net to provide a heat dissipation outlet, which is both ventilated and rainproof. The power consumption of traditional bait stations using optical fiber is above 1kW. The power consumption of the wireless bait station of the present invention can be less than 500W, so that the wireless bait station can use a low-power gasoline generator, which generally weighs less than 30kg and is easy to carry.

[0039] like Figure 3 As shown, the FPGA of the handheld synchronization device includes a command control forwarding module, a clock latch module and a clock switching module; the command control forwarding module is used to process the touch input instructions of the touch screen and send the operation completion status to the touch screen as a display output, and at the same time collect, store and forward the decoy control commands of the radar; the clock latch module sends clock control data to the clock phase-locked distribution chip of the handheld synchronization device according to the touch input requirements, and completes the locking, storage and forwarding of the synchronous clock of the radar; the clock switching module controls the RF switching switch to switch the reference clock source of the clock phase-locked distribution chip.

[0040] like Figure 4 As shown, the FPGA for waveform generation inside the wireless light decoy includes a control command parsing module, a clock configuration module, a synchronization control module and a waveform data generation module; the control command parsing module is used to parse the decoy control command forwarded by the handheld synchronization device to obtain the corresponding periodic synchronization pulse, wave control code, waveform code and frequency code; the clock configuration module sends the clock configuration data to the clock phase-locked distribution chip inside the waveform generation, so that the phase-locked loop inside the clock phase-locked distribution chip completes the phase locking and frequency division of the reference clock source, and then sends a selection signal to the RF switching switch to switch the reference clock source of the clock phase-locked distribution chip, and finally outputs the working clock and DAC clock that are coherent with the radar; the synchronization control module generates the radar cycle start time according to the periodic synchronization pulse as the timing reference for generating DAC data; the waveform data generation module generates DAC data according to the wave control code, waveform code and frequency code, and outputs it according to the timing requirements.

[0041] The use process of the wireless lightweight coherent radar decoy device is as follows Figure 5 As shown, the following takes the radar synchronization clock of 100 MHz, the FPGA working clock of 100 MHz, and the DAC clock of 1000 MHz as an example to illustrate the solution of the present invention.

[0042] During use, the handheld synchronization device needs to go through two cable connection and removal processes: after the radar and decoy device are turned on, the handheld synchronization device is carried to the radar, and the radar's RF interface is connected to the handheld synchronization device's RF input interface, and the radar's communication interface is connected to the handheld synchronization device's communication input interface with a cable. After the handheld synchronization device completes locking, storage and forwarding of the radar's synchronization clock and completes the collection, storage and forwarding of the radar's decoy control commands, the cable connecting the handheld synchronization device to the radar is removed; the handheld synchronization device is carried to the wireless decoy station, and the wireless decoy station's RF interface is connected to the handheld synchronization device's RF output interface, and the wireless decoy station's communication interface is connected to the handheld synchronization device's communication output interface with a cable. After the wireless decoy station completes locking and storage of the synchronization clock forwarded by the handheld synchronization device and completes the collection and storage of the forwarded decoy control commands, the cable connecting the wireless decoy station to the handheld synchronization device is removed.

[0043] The principle of radar synchronous clock acquisition, storage and forwarding is as follows: Figure 6 As shown. The reference clock source of the clock phase-lock distribution chip inside the handheld synchronization device can select the synchronization clock of the external input radar, or the latch clock output by the chip after its own frequency division. The switching process is controlled by the FPGA inside the device. Before pressing the synchronization input option on the touch screen of the handheld synchronization device, the default reference clock source is selected as the synchronization clock of the external input radar. After pressing it, after the clock phase-lock distribution chip completes the phase-locking, the latch clock output by the clock phase-lock distribution chip after its own frequency division is selected as the reference clock source. The reference clock source of the clock phase-lock distribution chip generated by the waveform inside the wireless bait station is similar to that of the handheld synchronization device. It is also the default synchronization clock forwarded by the external input handheld synchronization device. After pressing the synchronization output option on the touch screen of the handheld synchronization device, it becomes the self-locking clock output by the chip after its own frequency division.

[0044] The process of the handheld synchronization device locking, storing and forwarding the radar's synchronization clock includes:

[0045] Step 1: How to lock the radar's synchronization clock with the handheld synchronization device:

[0046] The clock phase-locked distribution chip inside the handheld synchronization device first uses the 100MHz synchronization clock of the external radar as the reference clock source, and locks the operating frequency of its internal phase-locked loop to 2000MHz through control, and then divides the frequency to 100MHz and outputs it to the outside of the chip in three ways, of which the first way is output as a latched clock to the RF switch, the second way is output as a device clock to the FPGA, and the third way is output as a forwarded 100MHz synchronization clock;

[0047] Step 2: The steps for storing the radar's synchronization clock in the handheld synchronization device:

[0048] After receiving the 100MHz device clock, the FPGA inside the handheld synchronization device controls the RF switch to switch the reference clock source of the clock phase-locked distribution chip from the external input radar synchronization clock to the 100MHz latched clock inside the device itself. The clock phase-locked distribution chip uses the new clock as the reference clock source, still locks the operating frequency of the internal phase-locked loop to 2000MHz, and updates the three clock outputs of the chip. At this time, the clock phase-locked distribution chip forms a self-locking, and no longer needs the external input radar synchronization clock;

[0049] Step 3: The waveform generated in the wireless bait station locks the synchronization clock forwarded by the handheld synchronization device:

[0050] The internal clock phase-locked distribution chip of the waveform generation first uses the 100MHz synchronization clock forwarded by the handheld synchronization device as the reference clock source, and controls the operating frequency of the internal phase-locked loop of the clock phase-locked distribution chip to be locked to 2000MHz, and then divided into two paths and divided into 100MHz and 1000MHz respectively. The signal after the frequency division to 100MHz is also divided into two paths, of which the first path is output as a self-locking clock to the RF switching switch inside the waveform generation, and the second path is output as the working clock to the FPGA, and the signal divided to 1000MHz is output to the DAC chip as the DAC clock;

[0051] Step 4: The waveform in the wireless decoy station generates and stores the synchronization clock forwarded by the handheld synchronization device:

[0052] The FPGA inside the waveform generator receives a 100MHz working clock. After pressing the synchronization output option on the touch screen of the handheld synchronization device, the RF switch is controlled to switch the reference clock source of the clock phase-locked distribution chip from the synchronization clock forwarded by the external handheld synchronization device to the 100MHz self-locked clock inside the device itself. The clock phase-locked distribution chip uses the new clock as the reference clock source and still locks the operating frequency of the internal phase-locked loop to 2000MHz, and updates the clock outputs of each channel of the chip. At this time, the clock phase-locked distribution chip is self-locked and no longer requires the synchronization clock forwarded by the external handheld synchronization device.

[0053] The waveform is generated after locking the synchronization clock forwarded by the handheld synchronization device, and the internal clock phase-locked distribution chip is used to output the working clock to the FPGA. The bait control command forwarded by the handheld synchronization device is collected and stored, and then the time calibration is completed through the rising edge of the periodic synchronization pulse in the command, and the wave control code, waveform code and frequency code in the command are parsed and stored.

[0054] After the waveform generation synchronization is completed, the internal RF switch will switch the connection relationship between input and output, cutting off the path of the 100MHz synchronization clock forwarded by the handheld synchronization device to the clock phase-lock distribution chip inside the waveform generation. The handheld synchronization device detects this change and displays the synchronization output completion on the touch screen. At this time, the connection cable between the wireless bait station and the handheld synchronization device can be unplugged.

[0055] The waveform generation generates the radar cycle start time according to the periodic synchronization pulse in the decoy control command, which is used as the timing reference for generating DAC data. The type of waveform selection, timing control and frequency switching of the decoy emission are then completed according to the wave control code, waveform code and frequency code in the decoy control command. After the wireless decoy station starts transmitting, the radar transmission is turned on for detection, ultimately achieving the normal operation of the decoy system.

[0056] During the synchronization and control process, the phase-locked loop inside the handheld synchronization device locks the synchronization clock of the radar in less than 1 millisecond, and the internal FPGA collects and stores the bait control command, processes the touch input command and displays it on the touch screen in less than 5 seconds. In addition, the operation time is less than 5 seconds, so the total time for the handheld synchronization device to complete the synchronization input after connecting to the radar can be less than 10 seconds. Similarly, after the handheld synchronization device is connected to the waveform of the wireless bait station, the total time to complete the synchronization output can also be less than 10 seconds.

[0057] In the process of completing the synchronous input operation and the synchronous output operation, the operator needs to carry the handheld synchronization device from the radar to the wireless decoy station and complete the process of plugging and unplugging the cable plug, which also takes a lot of time. Considering that the commonly used coherent decoy system mostly uses three-point source decoy (that is, 3 decoys are arranged), the distance between each other is 150m to 300m, and the weight of the handheld synchronization device is very light (less than 3kg), the time for a single transfer of the device can be compressed to less than 3 minutes. When the RF interface and the communication interface are integrated into an aviation plug that supports fast plugging and unplugging, plus the moving and operating time, the total time for all three decoys to complete the synchronization process can be controlled within 10 minutes. If the task completion time requirement is very short, you can also use multiple handheld synchronization devices of the same model to latch the synchronization clock and collect the decoy control command from the radar, and then independently complete the synchronization of the decoys to reduce the total task completion time. During the operation of the radar and decoy, if the working status of the decoy needs to be changed urgently, a handheld synchronization device can be used to collect new decoy control commands from the radar, and then the device can be carried to the decoy and connected, and the command can be used to control the decoy to update the working status.

[0058] The present invention also provides a method for using a wireless lightweight coherent radar decoy device, comprising:

[0059] Step 1: The handheld synchronization device collects and stores the radar's synchronization clock and decoy control commands:

[0060] While the radar is being set up and turned on, the wireless decoy station is deployed to the preset position by means of vehicle transportation or multi-person team movement to complete the installation; after the radar is turned on, it is not launched for the time being. The operator brings a handheld synchronization device to the radar, connects the radar's RF interface with the handheld synchronization device's RF input interface, and the radar's communication interface with the handheld synchronization device's communication input interface with a cable, presses the synchronization input option on the touch screen of the handheld synchronization device, controls it to use the internal phase-locked loop to lock and store the radar's synchronization clock frequency, and uses FPGA to collect and store the radar's decoy control commands (synchronous pulses, wave control codes, waveform codes and frequency codes), waits for the locking and storage of the synchronization clock and the collection and storage of the decoy control commands to be completed and displayed on the touch screen of the handheld synchronization device, and then unplugs the connecting cable;

[0061] Step 2: The handheld synchronization device forwards the radar's synchronization clock and decoy control commands to the wireless decoy station:

[0062] The operator carries the handheld synchronization device to the wireless bait station, and uses a cable to connect the RF interface of the wireless bait station to the RF output interface of the handheld synchronization device, and the communication interface of the wireless bait station to the communication output interface of the handheld synchronization device. The operator presses the synchronization output option on the touch screen of the device to control the device to output the forwarded synchronization clock to the wireless bait station, and also outputs the collected bait control commands to the wireless bait station.

[0063] Step 3: The wireless decoy station transmits the corresponding decoy signal according to the decoy control command to complete the normal operation of the decoy system:

[0064] After waiting for the wireless decoy station to lock with the phase-locked loop generated by its internal waveform, store the synchronization clock frequency forwarded by the handheld synchronization device, and use FPGA to collect and store the decoy control command forwarded by the handheld synchronization device, the synchronization completion status will be displayed on the touch screen of the handheld synchronization device; the phase-locked loop generated by the waveform inside the wireless decoy station generates a working clock and DAC clock coherent with the radar through the locked frequency, and the waveform generated by the FPGA completes the time calibration through the rising edge of the periodic synchronization pulse in the decoy control command, and completes the type selection, timing control and frequency switching of the waveform emitted by the decoy according to the wave control code, waveform code and frequency code in the decoy control command; after the wireless decoy station starts transmitting, the radar transmission is turned on for detection, and finally the normal operation of the decoy system is realized.

[0065] The present invention completes the locking and forwarding of the radar synchronization clock through the handheld synchronization device and the respective phase-locked loop relay inside the waveform generator, so as to achieve the wireless coherent transmission of the synchronization clock. The synchronization coherent process of the handheld synchronization device used in the present invention does not require the use of the same phase-locked loop as a transit clock source. Therefore, under the condition of reducing the clock error requirement, multiple handheld synchronization devices can be used simultaneously to complete the coherent synchronization process of one radar and multiple wireless bait stations, which greatly compresses the operation time.

Claims

1. A wireless lightweight coherent radar decoy device, comprising a handheld synchronization device and a wireless decoy station, wherein the handheld synchronization device and the wireless decoy station are provided with a radio frequency interface and a communication interface, and characterized in that: The handheld synchronization device includes a radio frequency input interface, a radio frequency output interface, a communication input interface, a communication output interface, a radio frequency switching switch, a clock phase-locked distribution chip, an FPGA, a crystal oscillator, a touch screen, and a battery; the radio frequency input interface receives a synchronization clock of the radar, the communication input interface receives a decoy control command of the radar, the radio frequency output interface outputs a forwarded synchronization clock to a wireless decoy station, and the communication output interface outputs a forwarded decoy control command to the wireless decoy station; The RF switch is used to switch the reference clock source of the clock phase-locked distribution chip; the clock phase-locked distribution chip has a built-in phase-locked loop to complete clock phase locking and frequency division; The FPGA of the handheld synchronization device includes a command control forwarding module, a clock latch module, and a clock switching module; The command control forwarding module is used to process the touch input instructions of the touch screen and send the operation completion status to the touch screen as a display output, while collecting, storing and forwarding the radar's decoy control commands; The clock latch module sends clock control data to the clock phase-lock distribution chip of the handheld synchronization device according to the touch input requirements, completing the locking, storage and forwarding of the radar's synchronous clock; The clock switching module controls the RF switch to switch the reference clock source of the clock phase-locked distribution chip; The wireless bait station includes a wireless light bait and a generator; the wireless light bait includes a waveform generator, a power amplifier module, an omnidirectional antenna, a fan, and a bait compartment; the waveform generator includes a radio frequency interface and a communication interface, the waveform generator adopts a radio frequency direct transmission mode, and the power amplifier module uses a GaN power amplifier chip for amplification; the omnidirectional antenna is equipped with a protective antenna cover; the fan cooperates with the air duct to complete the forced air cooling heat dissipation in the wireless light bait; the bait compartment is equipped with a shutter with a dustproof net; The FPGA for waveform generation inside the wireless light decoy includes a control command parsing module, a clock configuration module, a synchronization control module and a waveform data generation module; the control command parsing module is used to parse the decoy control command forwarded by the handheld synchronization device to obtain the corresponding periodic synchronization pulse, wave control code, waveform code and frequency code; the clock configuration module sends the clock configuration data to the clock phase-locked distribution chip inside the waveform generation, so that the phase-locked loop inside the clock phase-locked distribution chip completes the phase locking and frequency division of the reference clock source, and then sends a selection signal to the RF switching switch to switch the reference clock source of the clock phase-locked distribution chip, and finally outputs the working clock and DAC clock that are coherent with the radar; the synchronization control module generates the start time of the radar cycle according to the periodic synchronization pulse as the timing reference for generating DAC data; the waveform data generation module generates DAC data according to the wave control code, waveform code and frequency code, and outputs it according to the timing requirements.

2. A wireless lightweight coherent radar decoy device according to claim 1, characterized in that: The operation process of the handheld synchronization device to lock, store and forward the radar's synchronization clock includes the following steps: Step 1: How to lock the radar's synchronization clock with the handheld synchronization device: The clock phase-locked distribution chip inside the handheld synchronization device first uses the 100MHz synchronization clock of the external radar as the reference clock source, and locks the operating frequency of its internal phase-locked loop to 2000MHz through control, and then divides the frequency to 100MHz and outputs it to the outside of the chip in three ways, of which the first way is output as a latched clock to the RF switch, the second way is output as a device clock to the FPGA, and the third way is output as a forwarded 100MHz synchronization clock; Step 2: The steps for storing the radar's synchronization clock in the handheld synchronization device: After receiving the 100MHz device clock, the FPGA inside the handheld synchronization device controls the RF switch to switch the reference clock source of the clock phase-locked distribution chip from the external input radar synchronization clock to the 100MHz latched clock inside the device itself. The clock phase-locked distribution chip uses the new clock as the reference clock source, locks the operating frequency of the internal phase-locked loop to 2000MHz, and updates the three clock outputs of the chip. Step 3: The waveform generated in the wireless bait station locks the synchronization clock forwarded by the handheld synchronization device: The internal clock phase-locked distribution chip of the waveform generation first uses the 100MHz synchronization clock forwarded by the handheld synchronization device as the reference clock source, and controls the operating frequency of the internal phase-locked loop of the clock phase-locked distribution chip to be locked to 2000MHz, and then divided into two paths and divided into 100MHz and 1000MHz respectively. The signal after the frequency division to 100MHz is also divided into two paths, of which the first path is output as a self-locking clock to the RF switching switch inside the waveform generation, and the second path is output as the working clock to the FPGA, and the signal divided to 1000MHz is output to the DAC chip as the DAC clock; Step 4: The waveform in the wireless decoy station generates and stores the synchronization clock forwarded by the handheld synchronization device: The FPGA inside the waveform generator receives a 100MHz working clock. After pressing the synchronization output option on the touch screen of the handheld synchronization device, the RF switch is controlled to switch the reference clock source of the clock phase-locked distribution chip from the synchronization clock forwarded by the external handheld synchronization device to the 100MHz self-locked clock inside the device itself. The clock phase-locked distribution chip uses the new clock as the reference clock source and still locks the operating frequency of the internal phase-locked loop to 2000MHz, and updates the clock outputs of each channel of the chip. At this time, the clock phase-locked distribution chip is self-locked.

3. A wireless lightweight coherent radar decoy device according to claim 1 or 2, characterized in that: The RF interface and communication interface of the handheld synchronization device and the wireless bait station are integrated into one aviation plug.

4. A wireless lightweight coherent radar decoy device according to claim 1 or 2, characterized in that: The power consumption of the generator is less than or equal to 500W.

5. A wireless lightweight coherent radar decoy device according to claim 1 or 2, characterized in that: The waveform generation and power amplifier module of the wireless bait station form a power component.

6. A method for using a wireless lightweight coherent radar decoy device, characterized in that: The following steps are involved: Step 1: The handheld synchronization device collects and stores the synchronization clock and decoy control commands of the radar: the wireless decoy station is arranged at the preset position to complete the installation; After the radar is turned on, it does not start transmitting for the time being. The operator brings a handheld synchronization device to the radar, connects the radar's RF interface with the handheld synchronization device's RF input interface, and the radar's communication interface with the handheld synchronization device's communication input interface with a cable, presses the synchronization input option on the handheld synchronization device's touch screen, controls it to use the internal phase-locked loop to lock and store the radar's synchronization clock frequency, and uses FPGA to collect and store the radar's decoy control commands. After waiting for the locking and storage of the synchronization clock and the collection and storage of the decoy control commands to be completed and displayed on the handheld synchronization device's touch screen, unplug the connection cable; Step 2, the handheld synchronization device forwards the synchronization clock and bait control command of the radar to the wireless bait station: the operator carries the handheld synchronization device to the wireless bait station, uses a cable to connect the RF interface of the wireless bait station with the RF output interface of the handheld synchronization device, and the communication interface of the wireless bait station with the communication output interface of the handheld synchronization device, presses the synchronization output option on the touch screen of the device, controls the device to output the forwarded synchronization clock to the wireless bait station, and also outputs the collected bait control command to the wireless bait station; Step 3. The wireless decoy station transmits the corresponding decoy signal according to the decoy control command and completes the normal operation of the decoy system: wait for the wireless decoy station to lock with the phase-locked loop generated by its internal waveform, store the synchronization clock frequency forwarded by the handheld synchronization device, and use FPGA to collect and store the decoy control command forwarded by the handheld synchronization device, and then display the synchronization completion status on the touch screen of the handheld synchronization device; the phase-locked loop generated by the waveform inside the wireless decoy station generates a working clock and DAC clock coherent with the radar through the locked frequency, and the FPGA generated by the waveform completes the time calibration through the rising edge of the periodic synchronization pulse in the decoy control command, and completes the type selection, timing control and frequency switching of the waveform emitted by the decoy according to the wave control code, waveform code and frequency code in the decoy control command; After the wireless decoy station starts transmitting, turn on the radar.

7. The method for using a wireless lightweight coherent radar decoy device according to claim 6, characterized in that: The radar's decoy control commands include synchronization pulses, wave control codes, waveform codes and frequency codes.

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