Missile-borne data link anti-interference method based on double-frequency hopping

Abstract

The invention discloses a missile-borne data link anti-interference method based on dual-frequency hopping, which is characterized in that on the basis of adopting a set of signal processing chip and a frequency conversion module, the dual-channel characteristic of a frequency agility chip in the frequency conversion module is utilized to output frequency signals with the working frequency band difference of 40MHz, and the frequency signals are subjected to radio frequency multiplication on two different frequency bands. According to the method, the high-speed frequency hopping capability is realized under the condition of not additionally increasing hardware resources and algorithm complexity while ensuring that the missile-borne data chain has the double-frequency hopping capability.

Description

Technical Field

[0001] The invention belongs to the technical field of wireless communication, and in particular relates to a missile-borne data link anti-interference method based on dual-frequency hopping. Background Art

[0002] At present, with the development of wireless communication technology, wireless communication equipment is used more and more in missiles, making the electromagnetic environment of the missile more complex, requiring the missile-borne data link to have strong anti-interference capability.

[0003] The interference in the missile working environment is generally divided into narrowband interference, random noise interference, follow-up interference, broadband blocking interference, etc. At present, the anti-interference methods of domestic missile-borne data links mostly adopt spread spectrum and frequency hopping anti-interference methods. Among them, spread spectrum anti-interference can only be used in missile-borne data links with low transmission rates. Most missile-borne data links use frequency hopping anti-interference methods to resist complex electromagnetic environments. In order to achieve anti-interference capabilities at a wider frequency, missile-borne data links generally achieve frequency hopping capabilities in multiple frequency bands by adding multi-channel RF hardware and parallel signal processing hardware on the basis of traditional frequency hopping communication systems. This not only increases the hardware complexity of the product, but also increases the redundancy of the equipment. Therefore, a new frequency hopping anti-interference data link design method is urgently needed to achieve the original multi-band frequency hopping capability without increasing the hardware complexity. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a missile-borne data link anti-interference method based on dual-frequency frequency hopping. On the basis of adopting a set of signal processing chips and frequency conversion modules, the dual-channel characteristics of the frequency conversion chip in the frequency conversion module are used to output frequency signals with a difference of 40MHz in the working frequency band, and the frequency is multiplied by radio frequency in two different frequency bands. This method ensures that the missile-borne data link has dual-frequency frequency hopping capability, and realizes high-speed frequency hopping capability without additionally increasing hardware resources and algorithm complexity.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] Step 1: The missile-borne data link anti-interference method based on dual-frequency frequency hopping includes a radio frequency module, a frequency conversion module and a baseband signal processing module, wherein the radio frequency module is responsible for the filtering, power amplification, receiving and sending functions of the dual-frequency signals, the frequency conversion module is responsible for the up and down frequency conversion functions of the dual-frequency signals, and the baseband signal processing is responsible for the simultaneous encoding and decoding, modulation and demodulation, and frequency hopping control functions of the dual-frequency signals;

[0007] Step 2: The baseband signal processing module encodes and decodes the service information, modulates and demodulates it to form two intermediate frequency signals with a difference of 40MHz. After the two intermediate frequency signals are sent to the frequency conversion module, the frequency conversion module up-converts the two intermediate frequency signals to different working frequency bands respectively, and sends the two intermediate frequency signals to different antennas respectively through the radio frequency module;

[0008] Step 3: After receiving the communication signal, the four RF channels in the RF module are sent to the frequency conversion module for down-conversion into four intermediate frequency signals. The working frequency bands of every two intermediate frequency signals are consistent. The intermediate frequency signals are converted into four IQ baseband signals through ADC sampling and down-conversion, and sent to the baseband signal processing module;

[0009] Step 4: Baseband signal processing For each 2 IQ signals, the 4 signals are merged into 2 baseband signals of different frequencies through the vector synthesis superposition algorithm, and then one signal is prioritized for demodulation and decoding through the amplitude comparison algorithm to achieve the synchronous reception capability of dual frequency hopping signals.

[0010] Preferably, the radio frequency module has 2 transmitters and 4 receivers.

[0011] Preferably, the different operating frequency bands are L band and S band.

[0012] The beneficial effects of the present invention are as follows:

[0013] Compared with the existing methods, the present invention can realize the dual-frequency hopping capability of the data link by using a set of processing hardware without increasing the complexity of hardware and software, thereby reducing the complexity of the anti-interference processing technology and the hardware cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the hardware architecture of the present invention.

[0015] Figure 2 It is a schematic diagram of the received signal processing flow of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] The technical problem to be solved by the present invention is that in order to improve the frequency hopping and anti-interference capability of traditional data links, multi-channel RF hardware and parallel signal processing hardware are often used to realize multi-band frequency hopping function. However, the hardware volume is large and the software complexity is high, which makes it difficult to meet the application requirements of low-cost and small-volume ammunition platforms.

[0018] In order to solve the above technical problems, the present invention provides a missile-borne data link anti-interference method based on dual-frequency hopping, comprising the following steps:

[0019] S1: The anti-interference method of the missile-borne data link based on dual-frequency frequency hopping includes a radio frequency module (2 transmitters and 4 receivers), a frequency conversion module and a baseband signal processing module. The radio frequency module is mainly responsible for the receiving and sending functions such as filtering and power amplification of dual-frequency signals. The frequency conversion module is mainly responsible for the up and down frequency conversion functions of dual-frequency signals. The baseband signal processing is mainly responsible for the simultaneous encoding and decoding, modulation and demodulation, and frequency hopping control functions of dual-frequency signals.

[0020] S2: The baseband signal processing module encodes and decodes the service information, modulates and demodulates it to form two intermediate frequency signals with a phase difference of 40MHz. After the intermediate frequency signals are sent to the frequency conversion module, the frequency conversion module up-converts the two intermediate frequency signals to different working frequency bands, such as L band and S band, and sends the two signals to different antennas through the RF module.

[0021] S3: After receiving the communication signal, the four RF channels in the RF module are sent to the frequency conversion module for down-conversion into four intermediate frequency signals. The working frequency bands of every two intermediate frequency signals are consistent. The intermediate frequency signals are converted into four IQ baseband signals through ADC sampling and down-conversion, and sent to the baseband signal processing module;

[0022] S4: Baseband signal processing For each 2 IQ signals, the 4 signals are merged into 2 baseband signals with different frequencies through the vector synthesis superposition algorithm, and then one signal is prioritized for demodulation and decoding through the amplitude comparison algorithm to achieve the synchronous reception capability of dual-frequency hopping signals.

[0023] Example:

[0024] like Figure 1 and Figure 2 As shown, a missile-borne data link anti-interference method based on dual-frequency hopping of the present invention comprises the following steps:

[0025] S1: The missile-borne data link anti-interference method based on dual-frequency frequency hopping includes a radio frequency module (2 transmitters and 4 receivers), a frequency conversion module and a baseband signal processing module. The radio frequency module is mainly responsible for the receiving and sending functions such as filtering and power amplification of dual-frequency signals. The frequency conversion module is mainly responsible for the digital-to-analog conversion and up-down conversion of dual-frequency signals. The baseband signal processing is mainly responsible for the simultaneous encoding and decoding, modulation and demodulation and frequency hopping control of dual-frequency signals.

[0026] S2; the baseband signal processing module encodes and decodes the service information, modulates and demodulates it to form an IQ baseband signal, which is then sent to the frequency conversion module, and controls the frequency conversion module to output the operating frequency according to the frequency hopping pattern, jumping from the pulse frequency f1 to f10 every 200us;

[0027] S3: After receiving the baseband signal, the frequency conversion module converts the baseband signal into two intermediate frequency signals through DAC sampling and up-conversion, and each intermediate frequency signal is 40MHz apart;

[0028] S4: After receiving the intermediate frequency signal, the RF module amplifies the intermediate frequency signal to the L and S frequency bands through multi-stage amplification, filtering, mixing and filtering.

[0029] S5: After receiving the 4 RF signals, the RF module down-converts them into 4 IF signals through low noise amplification, filtering, mixing, and the interval between every two IF signals is 40MHz.

[0030] S6: After receiving the intermediate frequency signal, the frequency conversion module receives the frequency hopping control of the baseband signal processing module, and converts the intermediate frequency signal into 4-channel IQ baseband signals through ADC sampling and down-conversion in a manner of jumping from the pulse frequency point f1 to f10 every 200us, and sends them to the baseband signal processing module;

[0031] S7: The baseband signal processing module receives 4 IQ signals at the same time. For every 2 IQ signals, the 4 signals are merged into 2 baseband signals with different frequencies through the vector synthesis superposition algorithm. The strength of the two signals is compared through the amplitude comparison algorithm, and the best signal is given priority to enter the demodulation and decoding, so as to realize the anti-interference capability of the data link.

Claims

1. A missile-borne data link anti-interference method based on dual-frequency hopping, characterized in that: The steps include: Step 1: The missile-borne data link anti-interference method based on dual-frequency frequency hopping includes a radio frequency module, a frequency conversion module and a baseband signal processing module, wherein the radio frequency module is responsible for the filtering, power amplification, receiving and sending functions of the dual-frequency signals, the frequency conversion module is responsible for the up and down frequency conversion functions of the dual-frequency signals, and the baseband signal processing is responsible for the simultaneous encoding and decoding, modulation and demodulation, and frequency hopping control functions of the dual-frequency signals; Step 2; The baseband signal processing module encodes, decodes, modulates and demodulates the service information to form two intermediate frequency signals with a phase difference of 40MHz. After the two intermediate frequency signals are sent to the frequency conversion module, the frequency conversion module up-converts the two intermediate frequency signals to different working frequency bands respectively, and sends the two intermediate frequency signals to different antennas respectively through the RF module; Step 3: After receiving the communication signal, the four RF channels in the RF module are sent to the frequency conversion module for down-conversion into four intermediate frequency signals. The working frequency bands of every two intermediate frequency signals are consistent. The intermediate frequency signals are converted into four IQ baseband signals through ADC sampling and down-conversion, and sent to the baseband signal processing module; Step 4: Baseband signal processing For each 2 IQ signals, the 4 signals are merged into 2 baseband signals of different frequencies through the vector synthesis superposition algorithm, and then one signal is prioritized for demodulation and decoding through the amplitude comparison algorithm to achieve the synchronous reception capability of dual frequency hopping signals.

2. According to claim 1, a missile-borne data link anti-interference method based on dual-frequency hopping is characterized in that: The radio frequency module has 2 transmitters and 4 receivers.

3. The anti-interference method of missile-borne data link based on dual-frequency hopping according to claim 1 is characterized in that: The different operating frequency bands are L band and S band.

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