A method for increasing the instantaneous bandwidth of a throwable active decoy bomb

Abstract

A method for increasing the instantaneous bandwidth of a throwable active decoy belongs to the technical field of interference of an external throwable active decoy in electronic countermeasures. A receiving end divides an 8GHz bandwidth signal into two 4GHz bandwidth radio frequency signals, mixes the two 4GHz bandwidth radio frequency signals into the same 4GHz bandwidth intermediate frequency signal, and folds the 8GHz bandwidth radio frequency signal into a 4GHz bandwidth intermediate frequency signal by combining, and the signal amplitudes in the two intermediate frequency signals are superimposed; a transmitting channel divides a 4GHz bandwidth intermediate frequency signal into two, mixes the two 4GHz bandwidth intermediate frequency signals into two signals of f0~f0+4GHz and f0~f0‑4GHz, respectively, and combines and superimposes the two 4GHz bandwidth radio frequency signals to form an 8GHz instantaneous bandwidth signal. The present invention uses an ADC with a sampling rate of 9Gsps to achieve an instantaneous bandwidth of 8GHz, which solves the problem of achieving an instantaneous large bandwidth in a small space of a decoy.

Description

Technical Field

[0001] The invention belongs to the technical field of interference of an externally thrown active decoy bomb in electronic countermeasures, and in particular relates to a method for increasing the instantaneous bandwidth of a thrown active decoy bomb. Background Art

[0002] Throwable active decoy bombs are used to counter terminal air-to-terminal guided weapons. They forward the received radar seeker signal to form a realistic false target signal, thereby deflecting the seeker's tracking of the target aircraft and improving the aircraft's survivability.

[0003] In today's air-to-air combat, the operating frequency bandwidth of air-to-air terminally guided weapons can cover 8GHz, so the instantaneous bandwidth of the throwable active decoy bomb must reach 8GHz to effectively interfere with the threat signal. At present, the industry's multi-bit ADC sampling rate can only reach 9Gsps. According to the Nyquist theorem and engineering feasibility, the ADC with this sampling rate can only achieve 4GHz instantaneous bandwidth sampling. In order to achieve an instantaneous bandwidth of 8GHz, the current mainstream method is to splice two ADCs. However, the decoy bomb is small in size and space is limited, so the splicing method cannot be used to achieve the design requirements of large instantaneous bandwidth. Summary of the invention

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a method for increasing the instantaneous bandwidth of a throwable active decoy bomb. An ADC with a sampling rate of 9Gsps can achieve an instantaneous bandwidth of 8GHz, solving the problem of achieving an instantaneous large bandwidth in a small space of the decoy bomb.

[0005] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0006] A method for increasing the instantaneous bandwidth of a throwable active decoy bomb comprises the following steps: a receiving end divides an 8 GHz bandwidth signal into two 4 GHz bandwidth radio frequency signals, mixes the two 4 GHz bandwidth radio frequency signals into the same 4 GHz bandwidth intermediate frequency signal, folds the 8 GHz bandwidth radio frequency signal into a 4 GHz bandwidth intermediate frequency signal by combining, superimposes the signal amplitudes in the two intermediate frequency signals, and retains all information; a transmitting channel divides a 4 GHz bandwidth intermediate frequency signal into two, mixes the two 4 GHz bandwidth intermediate frequency signals into two signals of f0 to f0+4 GHz and f0 to f0-4 GHz, combines and superimposes the two 4 GHz bandwidth radio frequency signals, forms an 8 GHz instantaneous bandwidth signal, and retains the original information.

[0007] Furthermore, the signal receiving specifically includes the following steps:

[0008] S01: The decoy receives the signal in the f0±4GHz frequency band, which is divided into two signals by the splitter / combiner. After passing through the corresponding filters, the two signals of f0~f0+4GHz and f0~f0-4GHz are output, where f0 is the center frequency.

[0009] S02: One of the f0~f0+4GHz signals is mixed with the high local oscillator signal after passing through the transceiver switch, amplifier, transceiver switch, and filter to generate an intermediate frequency signal. The intermediate frequency signal is filtered to remove the 4GHz bandwidth of the sideband, and the frequency is 0.3 GHz~4.3GHz signal;

[0010] S03: Another f0~f0-4GHz signal is mixed with the high local oscillator signal after passing through the transceiver switch, amplifier, transceiver switch, and filter to generate an intermediate frequency signal. The intermediate frequency signal is filtered to remove the sideband 4GHz bandwidth, and the frequency is 0.3 GHz~4.3GHz bandwidth signal;

[0011] S04: The two lower sideband signals are combined into a signal with a frequency of 0.3 GHz to 4.3 GHz through a splitter / combiner, analog-to-digital conversion is performed through an anti-aliasing filter, and digital signal processing is performed using FPGA.

[0012] Furthermore, in step S02, the high local oscillator signal frequency is f0+4.3 GHz.

[0013] Furthermore, in step S03, the high local oscillation signal frequency is f0+0.3 GHz.

[0014] Furthermore, the signal transmission specifically includes the following steps:

[0015] S1: Transmitting link: After the digital-to-analog converter converts the digital signal into an analog signal, it generates a 4GHz bandwidth signal with a frequency of 0.3GHz to 4.3GHz through the transceiver switch and filtering. The 4GHz intermediate frequency signal is divided into two paths through the splitter / combiner;

[0016] S2: After one of the signals is mixed and filtered with frequency synthesizer 1, the 4GHz bandwidth intermediate frequency signal is converted into an RF signal in the frequency band of f0 to f0+4GHz. After passing through the transceiver switch, RF amplification and transceiver switch, the RF signal in the frequency band of f0 to f0+4GHz is amplified, and f0 is the center frequency.

[0017] S3: After another signal is mixed and filtered with frequency synthesizer 2, the 4GHz bandwidth intermediate frequency signal is converted into a radio frequency signal in the frequency band range of f0~f0-4GHz, and the radio frequency signal in the frequency band of f0~f0-4GHz is amplified and filtered after the transceiver switch, and the radio frequency signal in the frequency band of f0~f0-4GHz is amplified;

[0018] S4: Combine the two signals of f0~f0+4GHz and f0~f0-4GHz with a splitter / combiner, and superimpose the two signals to achieve a radio frequency signal with an instantaneous bandwidth of 8GHz.

[0019] Furthermore, the frequency of the frequency synthesizer 1 is f0+4.3 GHz.

[0020] Furthermore, the frequency of the frequency synthesis 2 is f0+0.3 GHz.

[0021] The beneficial effects of the present invention are as follows: the present invention uses an ADC with a sampling rate of 9Gsps to achieve an instantaneous bandwidth of 8GHz. Compared with the traditional folding design, the present invention reduces one ADC chip, one DAC chip and several power supply chips, effectively reduces the volume and cost, and meets the requirements of small volume, low power consumption and low cost of the decoy bomb. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of a method for increasing the instantaneous bandwidth of a throwable active decoy bomb according to the present invention. DETAILED DESCRIPTION

[0023] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0024] like Figure 1 As shown, the present invention provides a method for increasing the instantaneous bandwidth of a throwable active decoy bomb. The receiving end divides the 8GHz bandwidth signal into two 4GHz bandwidth radio frequency signals, mixes the two 4GHz bandwidth radio frequency signals into the same 4GHz bandwidth intermediate frequency signal, and folds the 8GHz bandwidth radio frequency signal into a 4GHz bandwidth intermediate frequency signal by combining. The signal amplitudes in the two intermediate frequency signals are superimposed, and all information is retained. The signal receiving and processing process specifically includes the following steps:

[0025] S01: The decoy receives the signal of f0±4GHz band through the front-end component, which is divided into two signals by the splitter / combiner. After passing through the corresponding filters, the two signals of f0~f0+4GHz and f0~f0-4GHz are output, with f0 as the center frequency.

[0026] S02: One of the f0~f0+4GHz signals is mixed with the high local oscillator signal (frequency f0+4.3GHz) to generate an intermediate frequency signal after passing through the transceiver switch, amplifier, transceiver switch and filter. The intermediate frequency signal is filtered to remove the sideband 4GHz bandwidth (0.3 GHz-4.3GHz) signal;

[0027] S03: Another f0~f0-4GHz signal is mixed with a high local oscillator signal (frequency f0+0.3GHz) to generate an intermediate frequency signal after passing through a transceiver switch, an amplifier, a transceiver switch and a filter. The intermediate frequency signal is filtered to remove the sideband 4GHz bandwidth (0.3 GHz-4.3GHz) signal.

[0028] S04: The two lower sideband signals are combined into a signal with a frequency of 0.3 GHz to 4.3 GHz through a splitter / combiner, analog-to-digital conversion is performed through an anti-aliasing filter, and digital signal processing is performed using FPGA.

[0029] The signal transmission process is as follows:

[0030] The transmission channel divides a 4GHz bandwidth intermediate frequency signal into two channels, mixes the two 4GHz bandwidth intermediate frequency signals into two signals of f0~f0+4GHz and f0~f0-4GHz respectively, and superimposes the two 4GHz bandwidth RF signals through combining to form an 8GHz instantaneous bandwidth signal, and the original information is retained. The specific implementation method is as follows:

[0031] S1: Transmitting link: After the digital-to-analog converter (DAC) converts the digital signal into an analog signal, it generates 4GHz, 0.3GHz~4.3GHz signals through the transceiver switch and filtering, and the 4GHz intermediate frequency signal is divided into two paths through the splitter / combiner;

[0032] S2: After one of the signals is mixed and filtered with frequency synthesizer 1 (f0+4.3GHz), the 4GHz bandwidth intermediate frequency signal is converted into a radio frequency signal in the frequency band of f0~f0+4GHz. The radio frequency signal in the frequency band of f0~f0+4GHz is amplified through the transceiver switch, radio frequency amplification and filtering after the transceiver switch for subsequent transmission;

[0033] S3: After another signal is mixed and filtered with frequency synthesizer 2 (f0+0.3GHz), the 4GHz bandwidth intermediate frequency signal is converted into a radio frequency signal in the frequency band range of f0~f0-4GHz, and then filtered after the transceiver switch, amplification and transceiver switch to achieve amplification of the radio frequency signal in the frequency band of f0~f0-4GHz for subsequent transmission;

[0034] S4: The two signals of f0~f0+4GHz and f0~f0-4GHz are combined by a splitter / combiner, and the two signals are superimposed to realize an RF signal with an instantaneous bandwidth of 8GHz.

[0035] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Alterations, modifications, substitutions and variations of the above embodiments by a person skilled in the art are all within the scope of the present invention.

Claims

1. A method for increasing the instantaneous bandwidth of a throwable active decoy bomb, characterized in that: The receiving end divides the 8GHz bandwidth signal into two 4GHz bandwidth RF signals, mixes the two 4GHz bandwidth RF signals into the same 4GHz bandwidth intermediate frequency signal, and folds the 8GHz bandwidth RF signal into a 4GHz bandwidth intermediate frequency signal by combining. The signal amplitudes in the two intermediate frequency signals are superimposed to retain all information; the transmitting channel divides a 4GHz bandwidth intermediate frequency signal into two, mixes the two 4GHz bandwidth intermediate frequency signals into two signals of f0~f0+4GHz and f0~f0-4GHz respectively, combines and superimposes the two 4GHz bandwidth RF signals to form an 8GHz instantaneous bandwidth signal, and retains the original information.

2. A method for increasing the instantaneous bandwidth of a throwable active decoy bomb according to claim 1, characterized in that: Signal reception specifically includes the following steps: S01: The decoy receives the signal in the f0±4GHz frequency band, which is divided into two signals by the splitter / combiner. After passing through the corresponding filters, the two signals of f0~f0+4GHz and f0~f0-4GHz are output, where f0 is the center frequency. S02: one of the f0~f0+4GHz signals is mixed with the high local oscillator signal after passing through the transceiver switch, amplifier, transceiver switch, and filter to generate an intermediate frequency signal. The intermediate frequency signal is filtered to remove the sideband 4GHz bandwidth, and the frequency is 0.3 GHz~4.3GHz signal; S03: Another f0~f0-4GHz signal is mixed with the high local oscillator signal after passing through the transceiver switch, amplifier, transceiver switch, and filter to generate an intermediate frequency signal. The intermediate frequency signal is filtered to remove the sideband 4GHz bandwidth, and the frequency is 0.3 GHz~4.3GHz signal; S04: The two lower sideband signals are combined into a signal with a frequency of 0.3 GHz to 4.3 GHz through a splitter / combiner, analog-to-digital conversion is performed through an anti-aliasing filter, and digital signal processing is performed using FPGA.

3. A method for increasing the instantaneous bandwidth of a throwable active decoy bomb according to claim 2, characterized in that: In the step S02, the high local oscillator signal frequency is f0+4.3 GHz.

4. A method for increasing the instantaneous bandwidth of a throwable active decoy bomb according to claim 2, characterized in that: In the step S03, the high local oscillation signal frequency is f0+0.3 GHz.

5. A method for increasing the instantaneous bandwidth of a throwable active decoy bomb according to claim 1, characterized in that: The signal transmission specifically includes the following steps: S1: Transmitting link: After the digital-to-analog converter converts the digital signal into an analog signal, a 4GHz bandwidth signal is generated through the transceiver switch and filtering, and the frequency is 0.3GHz to 4.3GHz. The 4GHz bandwidth intermediate frequency signal is divided into two paths through the splitter / combiner; S2: After one of the signals is mixed and filtered with frequency synthesizer 1, the 4GHz bandwidth intermediate frequency signal is converted into an RF signal in the frequency band of f0 to f0+4GHz. After passing through the transceiver switch, RF amplification and transceiver switch, the RF signal in the frequency band of f0 to f0+4GHz is amplified, and f0 is the center frequency. S3: After another signal is mixed and filtered with frequency synthesizer 2, the 4GHz bandwidth intermediate frequency signal is converted into a radio frequency signal in the frequency band range of f0~f0-4GHz, and the radio frequency signal in the frequency band of f0~f0-4GHz is amplified and filtered after the transceiver switch, and the radio frequency signal in the frequency band of f0~f0-4GHz is amplified; S4: Combine the two signals of f0~f0+4GHz and f0~f0-4GHz with a splitter / combiner, and superimpose the two signals to achieve a radio frequency signal with an instantaneous bandwidth of 8GHz.

6. A method for increasing the instantaneous bandwidth of a throwable active decoy bomb according to claim 5, characterized in that: The frequency of the frequency synthesizer 1 is f0+4.3 GHz.

7. A method for increasing the instantaneous bandwidth of a throwable active decoy bomb according to claim 5, characterized in that: The frequency of the frequency synthesizer 2 is f0+0.3 GHz.

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