A full-time electronic jamming system transceiving method
By combining frequency domain estimation and self-interference signal cancellation methods in training and reconnaissance modes, the self-interference problem of the co-platform for jamming and reconnaissance was solved, achieving efficient self-interference suppression of the all-time electronic jamming system and improving the combat capability of the combat platform.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- UNIV OF ELECTRONICS SCI & TECH OF CHINA
- Filing Date
- 2025-05-20
- Publication Date
- 2026-06-26
AI Technical Summary
In existing technologies, when jamming and reconnaissance functions are shared on combat platforms such as fighter jets and ships, the high-power jamming signals emitted can cause self-interference in reconnaissance receivers, making it impossible to achieve all-time jamming and reconnaissance, thus affecting the smooth conduct of combat operations.
A method combining training and reconnaissance modes is adopted. The self-interference channel is estimated in the frequency domain. The self-interference channel is estimated in training mode and the self-interference signal is canceled in reconnaissance mode. The target signal is reconstructed using the reference signal and the channel estimate.
It enables estimation of self-interference channels without signal synchronization, reduces the complexity of self-interference suppression in jamming and reconnaissance co-platforms, and improves the synchronization and effectiveness of jamming and reconnaissance.
Smart Images
Figure CN120528548B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a full-time electronic jamming system, and in particular to a full-time electronic jamming system transceiver method. Background Technology
[0002] For core combat platforms such as fighter jets, ships, and armored vehicles, accurate control of battlefield situational information and the ability to transmit and receive electronic jamming and electronic reconnaissance around the clock are extremely necessary. For example, advanced fighter jets need to use jamming aircraft to continuously monitor enemy electronic signals during combat to provide strong support for operational decision-making. However, when jamming and reconnaissance functions operate simultaneously on the same platform, the high-power jamming signals emitted can cause severe self-interference to the reconnaissance receivers on the same platform, greatly interfering with or even blocking the effective detection of target signals by the reconnaissance aircraft, posing a serious challenge to the smooth progress of combat operations. To avoid the self-interference problem of simultaneous transmission and reception, existing solutions mostly utilize a time-division multiplexing system, but this cannot achieve continuous jamming and reconnaissance of target signals. For example, dividing time into multiple time slots and then arranging reconnaissance and jamming operations in different time slots means that during jamming time slots, it is impossible to detect enemy signal interference or important information, and during reconnaissance time slots, it is impossible to jam or attack the enemy, which may endanger the combat platform. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a real-time electronic jamming system transceiver method. This method combines a training mode and a reconnaissance mode. In the training mode, the self-interference channel is estimated in the frequency domain. Then, in the reconnaissance mode, the self-interference signal is canceled in the frequency domain to solve the self-interference problem of the jamming and reconnaissance co-platform.
[0004] The objective of this invention is achieved through the following technical solution: a method for transmitting and receiving in a full-time electronic jamming system, wherein the full-time electronic jamming system includes a jammer and a reconnaissance receiver, and the method includes the following steps:
[0005] S1. The jammer generates an interference signal with a period of N, performs digital-to-analog conversion and up-conversion on it, and then transmits it;
[0006] S2. The reconnaissance receiver enters training mode, and after down-converting and analog-to-digital conversion operations, the self-interference and reference signals are buffered for a length of 2N. N data points are selected and transformed into the frequency domain to perform self-interference channel estimation.
[0007] S3. The reconnaissance receiver enters reconnaissance mode, and after down-converting and analog-to-digital conversion of the received and reference signals, it buffers the signal for a length of 2N, selects N data points to transform to the frequency domain, reconstructs and cancels self-interference signals using the reference signal and channel estimation, and then inversely transforms it back to the time domain to obtain the target signal.
[0008] The beneficial effects of this invention are: the frequency domain interference suppression method adopted in this invention can estimate the self-interference channel without synchronizing the reference signal and the self-interference signal, thus solving the self-interference suppression problem of the interference detection co-platform and reducing the complexity of self-interference suppression of the interference detection co-platform. Attached Figure Description
[0009] Figure 1 This is a flowchart of the method of the present invention;
[0010] Figure 2 This is a schematic diagram illustrating the training mode principle of the all-time electronic jamming system in the embodiment.
[0011] Figure 3 This is a schematic diagram illustrating the reconnaissance mode principle of the all-time electronic jamming system in the embodiment;
[0012] Figure 4 The diagram shows the frequency domain interference suppression performance of the full-time electronic jamming system in this embodiment. Detailed Implementation
[0013] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.
[0014] like Figure 1 As shown, a method for transmitting and receiving in a full-time electronic jamming system is disclosed. The full-time electronic jamming system includes a jammer and a reconnaissance receiver. The method includes the following steps:
[0015] S1. The jammer generates an interference signal with a period of N, performs digital-to-analog conversion and up-conversion on it, and then transmits it;
[0016] S2. The reconnaissance receiver enters training mode, and after down-converting and analog-to-digital conversion operations, the self-interference and reference signals are buffered for a length of 2N. N data points are selected and transformed into the frequency domain to perform self-interference channel estimation.
[0017] S3. The reconnaissance receiver enters reconnaissance mode, and after down-converting and analog-to-digital conversion of the received and reference signals, it buffers the signal for a length of 2N, selects N data points to transform to the frequency domain, reconstructs and cancels self-interference signals using the reference signal and channel estimation, and then inversely transforms it back to the time domain to obtain the target signal.
[0018] Step S1 includes the following sub-steps:
[0019] S101. The jammer generates a periodic sequence x(n) of length N, performs digital-to-analog conversion and up-conversion on it, and obtains the jamming signal s(t):
[0020]
[0021] Among them, fs , θ s respectively represent the carrier frequency and initial phase of the jammer.
[0022] S102. The jammer transmits a jamming signal as the self-jamming signal of the reconnaissance receiver under the same platform.
[0023] Among them, the step S2 includes the following sub-steps:
[0024] S201. The reconnaissance receiver enters the training mode, and the received self-jamming signal can be expressed as after down-conversion
[0025]
[0026] where h si represents the self-jamming channel gain, f r represents the operating frequency of the reconnaissance receiver, θ r represents the phase of the reconnaissance receiver, and ω(t) represents thermal noise.
[0027] S202. After the analog-to-digital conversion operation of the self-jamming signal r si (t), it can be expressed as
[0028] r si (n) = h si x(n - D)e -j(2πΔf(n-D)+Δθ)+ω (n)
[0029] where D = τ / T s represents the normalized propagation delay, T s represents the sampling period, Δf = (f r - f s )T s represents the normalized frequency offset, Δθ = (θ r - θ s )T s represents the normalized phase error, and ω(n) represents thermal noise.
[0030] The reference signal can be expressed as
[0031] r f (n) = x(n)
[0032] S203. The reconnaissance receiver respectively caches the self-jamming signal r si and the reference signal r f Starting from the nth moment, n = 1, N, 2N,..., cache a length of 2N, and then select a signal with a length of N starting from the a (a < N)th signal, which can be respectively expressed as
[0033]
[0034] Obtain a complete self - interference signal \(r\) with length \(N\). si And the reference signal \(r\). f Then, with a period of \(N\), perform discrete - time Fourier transform to transform it into the frequency domain, which can be respectively expressed as
[0035]
[0036] where \(W(k)\) is thermal noise.
[0037] S204. Use the reference signal to estimate the self - interference channel of the received self - interference signal, and the channel estimation value can be obtained
[0038]
[0039] where \(W′(k)=W(k) / R(k)\). Assume that the actual self - interference channel estimation value is \(H\), then the self - interference channel estimation error is f (k),
[0040] where the step S3 includes the following sub - steps:
[0041] S301. The reconnaissance receiver enters the reconnaissance mode and simultaneously receives the self - interference signal and the target signal, which can be expressed as
[0042] r(t)=r si (t)+r d (t)+ω(t)
[0043] where \(r d (t)\) represents the target signal.
[0044] S302. After the analog - to - digital conversion operation of the received signal \(r(t)\), it can be expressed as
[0045] r(n)=r si (n)+r d (n)+ω(n)
[0046] where \(r d (n)\) represents the target signal.
[0047] S303. The reconnaissance receiver respectively caches the received signal \(r\) and the reference signal \(r f Starting from the \(n\) - th moment, cache a length of \(2N\), and then starting from the \(a\) (\(a < N\)) - th signal, select a signal with length \(N\), which can be respectively expressed as
[0048] r=r si +r d =[r(n + a + 1)r(n + a+N)]
[0049] rf = [x(n+a+1)x(n+a+N)]
[0050] Then the received signal r and the reference signal r are respectively... f Performing a discrete-time Fourier transform with a period of N, and transforming it to the frequency domain, the received signal can be expressed as:
[0051] R(k)=R si (k)+R d (k)
[0052] Among them, R d (k) represents the frequency domain form of the target signal.
[0053] S304. Channel estimation obtained using the training mode The reference signal is reconstructed to obtain the reconstructed self-interference signal.
[0054]
[0055] S305. Subtract the reconstructed self-interference signal from the received signal to obtain the residual signal.
[0056]
[0057] Therefore, the residual signal contains the target signal R. d (k) and residual interference signal ΔHR f .
[0058] S306. Perform an inverse Fourier transform on the residual signal and transform it to the time domain; it can be expressed as follows:
[0059] Δr(n)=r d (n)+ΔHr f
[0060] Ideally, the residual interference signal ΔHR f It can be ignored, therefore the target signal r can be obtained from the residual signal Δr(n). d All information about (n).
[0061] In the embodiments of this application, the reconnaissance receiver can perform subsequent reconnaissance signal processing on the residual signal Δr(n) to obtain the required information.
[0062] In the embodiments of this application, the all-time electronic jamming system includes a training mode and a reconnaissance mode. The training mode obtains the jamming channel estimate, such as... Figure 2 As shown. The reconnaissance mode reconstructs and cancels self-interference signals to obtain the target signal, as shown. Figure 3 As shown.
[0063] In the embodiments of this application, according to the method of the present invention, an interference detection platform model is constructed, the principle of which is as follows: Figure 2 Figure 3 As shown, the transmitter emits an interference signal, and the propagation environment is a multipath channel. Simulation verification was performed using MATLAB, and the simulation parameters are shown in the table below:
[0064]
[0065] Figure 4 The figure shows the interference suppression performance under different interference-to-noise ratios (IRRs). As can be seen from the figure, the interference suppression performance increases with the increase of the IRR. When the IRR is 0dB, the self-interference signal power is equal to the noise power, and the interference suppression performance is approximately 3dB. When the IRR is 30dB, the self-interference signal power is 10 times the noise power. 3 The interference suppression performance is approximately 30dB, which is a multiple of the original value. This indicates that the method can suppress self-interference signals to near-low noise levels.
[0066] The present invention has been described and demonstrated in detail herein, enabling those skilled in the art to understand and apply it. For those skilled in the art, various variations or modifications can be made based on the above description. Any alterations or modifications made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.
Claims
1. A method for transmitting and receiving a full-time electronic jamming system, wherein the full-time electronic jamming system comprises a jammer and a reconnaissance receiver, characterized in that: The method includes the following steps: S1. The jammer generates an interference signal with a period of N, performs digital-to-analog conversion and up-conversion on it, and then transmits it; S2. The reconnaissance receiver enters training mode, and after down-converting and analog-to-digital conversion operations, the self-interference and reference signals are buffered for a length of 2N. N data points are selected and transformed into the frequency domain to perform self-interference channel estimation. Step S2 includes the following sub-steps: S201. The reconnaissance receiver enters training mode and receives self-interference signals, which, after down-conversion, are represented as: ； in, Indicates the self-interference channel gain. This indicates the operating frequency of the reconnaissance receiver. Indicates the phase of the reconnaissance receiver. Indicates thermal noise; , These represent the carrier frequency and initial phase of the jammer, respectively. S202. Self-interference signal After the analog-to-digital conversion operation, it is represented as: ； in Indicates the normalized propagation delay. Indicates the sampling period. Indicates normalized frequency offset. Indicates the normalized phase error. Indicates thermal noise; The reference signal is represented as: ； S203. The reconnaissance receiver will transmit the self-interference signal separately. With reference signal Starting from the nth moment, Buffer a signal of length 2N, and then select signals of length N starting from the a-th signal, as follows: ； ； Among them, a <N; A complete self-interference signal of length N is obtained. With reference signal Then, with a period of N, a discrete-time Fourier transform is performed to transform it to the frequency domain, which can be expressed as follows: ； ； in, Thermal noise; S204. Using the reference signal, perform self-interference channel estimation on the received self-interference signal to obtain the channel estimate value. : ； in Assuming the actual self-interference channel estimate is H, then the self-interference channel estimation error is: ； S3. The reconnaissance receiver enters reconnaissance mode, performs down-conversion and analog-to-digital conversion on the received and reference signals, buffers them for a length of 2N, selects N data points to transform to the frequency domain, reconstructs and cancels self-interference signals using the reference signal and channel estimation, and then inversely transforms them back to the time domain to obtain the target signal.
2. The all-time electronic jamming system transceiver method according to claim 1, characterized in that: Step S1 includes the following sub-steps: S101. The jammer generates a periodic sequence of length N. After performing digital-to-analog conversion and up-conversion, the interference signal is obtained. : ； in, , These represent the carrier frequency and initial phase of the jammer, respectively. S102. The jammer transmits jamming signals as self-jamming signals for reconnaissance receivers on the same platform.
3. The all-time electronic jamming system transceiver method according to claim 1, characterized in that: Step S3 includes the following sub-steps: S301. The reconnaissance receiver enters reconnaissance mode and simultaneously receives both self-interference signals and target signals, as indicated by: ； in, Indicates the target signal; S302. Receiving signals After the analog-to-digital conversion operation, it is represented as: ； in, Indicates the target signal; S303. The reconnaissance receiver will receive the signals respectively. With reference signal Starting from the nth time step, buffer a length of 2N, and then select signals of length N starting from the ath signal, as follows: ； ； Among them, a <N; Then receive the signals respectively With reference signal Performing a discrete-time Fourier transform with a period of N, and transforming it to the frequency domain, the received signal is represented as: ； in, This is the frequency domain form of the target signal; S304. Channel estimation values obtained using the training mode The reference signal is reconstructed to obtain the reconstructed self-interference signal: ； S305. Subtract the reconstructed self-interference signal from the received signal to obtain the residual signal: ； Therefore, the residual signal contains the target signal. With residual interference signals ; S306. Perform an inverse Fourier transform on the residual signal and transform it to the time domain, as follows: ； Ideally, residual interference signals Negligible, therefore from the residual signal Obtain the target signal All information.