CN115865114A - Multi-order self-adaptive signal large dynamic receiving method - Google Patents
Multi-order self-adaptive signal large dynamic receiving method Download PDFInfo
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Abstract
The invention discloses a multi-order self-adaptive signal large dynamic receiving method, which belongs to the field of electronic countermeasure, and comprises the steps of firstly constructing a multi-level gain fusion unit selected by two route switches, wherein the multi-level gain fusion unit comprises a path of N-path coupling cascade amplification channels and a path of M-level coupling cascade attenuation channels, judging whether a signal is input into the N-level amplification channels or the M-level attenuation channels according to the signal amplitude information uploaded by a detector, and calculating and outputting the required gain or attenuation according to the signal amplitude; then calculating the noise coefficient and cascade propagation loss of the signal channel; then the attenuation coefficient of actual work is solved through an intelligent feedback network. And finally, the multistage gain fusion network is used for self-adapting feedback gain multiple, namely, reverse control gain and matching output level.
Description
Technical Field
The invention belongs to the field of electronic countermeasure, and particularly relates to a multi-order self-adaptive signal large dynamic receiving method.
Background
Modern electronic warfare technology develops day by day, and the receiving system sensitivity of electronic countermeasure equipment is higher, and performance such as frequency and bandwidth is also more superior. Generally, a broadband radio frequency channel often contains signals with different frequencies, and longer interference distance is realized as far as possible to adapt to more complex electromagnetic working environment, and radar signals with different strengths need to be received by a countermeasure system as much as possible. Especially for millimeter wave countermeasure systems with wider frequency bands, the larger the dynamic range is, the more powerful the environmental adaptability of the equipment is. Therefore, large dynamic reception technology is one of the currently important research hotspots.
At present, for a radar system, a receiving end realizes a larger dynamic range, firstly, the sensitivity of system receiving is reduced, environmental noise is reduced, and the signal strength processed by the front end of a receiver is enhanced, but under the condition of meeting the normal operation of equipment, the improvement and the improvement of the material and the performance of electronic components are limited, and the method for changing the sensitivity is increasingly difficult. In addition, a method can be adopted to receive larger signals as far as possible, particularly in the field of electronic countermeasure, the method can adapt to more complex noise environment, the influence of channel saturation on the radio frequency processing rear end is avoided, and the method is single in the mode of improving the upper limit of level reception. In addition, the noise figure range and gain flatness of normal operation are guaranteed, which is also a necessary concern for large dynamic range design of the system. In actual engineering practice, the factors in the above aspects need to be comprehensively considered, and a feasible solution is provided.
Disclosure of Invention
The invention provides a multi-order self-adaptive large dynamic signal receiving method, which aims at the conditions of high-frequency signals and large bandwidth, is single in the traditional large dynamic receiving method, has limited performance and cannot self-adaptively ensure the stability of large dynamic receiving.
The technical solution for realizing the invention is as follows: a multi-order self-adaptive signal large dynamic receiving method comprises the following steps:
step 1, constructing a path of coupling cascade amplification channel and a path of coupling cascade attenuation channel to form a multi-level gain fusion unit.
And 2, comparing the amplitude information of the signal uploaded by the detector with an amplitude regulation threshold value, and selecting an amplification channel or an attenuation channel in the multi-stage fusion gain unit.
And 3, increasing the gain stage number, calculating and outputting a level value after the gain of the stage according to the signal amplitude through the adaptive gain feedback real-time calculation, and judging whether the intermediate frequency processing requirement is met.
And 4, calculating the noise coefficient of the signal channel, and performing self-adaptive control on the channel so as to ensure the signal quality.
And 5, calculating cascade propagation loss, and adaptively ensuring the transmission flatness of the broadband signal.
And 6, tracking and feeding back the gain quantity in real time through an intelligent feedback network, determining the gain stage number, and outputting a level value of the safety range.
Compared with the prior art, the invention has the remarkable advantages that:
(1) The invention has simple principle and easy realization, can output the signal amplitude meeting the intermediate frequency processing through a gain feedback mechanism, has fast speed, high precision and good output stability of the amplitude measured by the detector, and can self-adaptively control the signal gain quantity through a feedback network.
(2) According to the frequency and bandwidth characteristics of the detection signal, the typical center frequency of the back-end digital signal processing is intelligently matched, the signal level range in the environment is fully received, and meanwhile, the flatness and the noise coefficient of the front-end signal transmission are guaranteed to be received, so that the signal-to-noise ratio in a channel is increased, and the receiving dynamic range is improved.
Drawings
Fig. 1 is a flow chart of a multi-stage adaptive large dynamic signal receiving method according to the present invention.
Fig. 2 is a working block diagram of a multi-stage adaptive large dynamic signal receiving method according to the present invention.
Fig. 3 is a diagram illustrating a large dynamic signal reception bandwidth.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without inventive step, are within the scope of the present invention.
The following further introduces specific embodiments, technical difficulties and inventions of the present invention with reference to the design examples.
The invention provides a method based on gain cascade coupling and parallel attenuation fusion, which is used for bidirectionally improving the dynamic range of a receiving front end of a system, thereby improving the sensitivity of electronic countermeasure when the receiving is difficult in a complex environment, receiving larger signals as far as possible, adaptively feeding back the transmission condition of a gain channel, avoiding the influence of channel saturation and the like on a radio frequency processing rear end, and realizing the large dynamic receiving function of the front end signals.
With reference to fig. 1 and fig. 2, a multi-level adaptive large dynamic signal receiving method of the present invention includes the following steps:
step 1, constructing one path of N-level coupling cascade amplification channel and one path of M-level coupling cascade attenuation channel to form a multi-level gain fusion unit. Wherein the gain of the first N-stage coupling cascade amplification channel is XH N The gain of the attenuation channel of the first M-stage coupling cascade is XL M Wherein M and N can be set according to actual index requirements and device performance.
Step 2, uploading signal amplitude A by the detector c And developing the intermediate frequency level value A 0 Comparison, adaptive selection of amplification or attenuation channel by a multi-stage fusion gain unit, A 0 Is the typical level amplitude of the signal if processing.
Step 3, increasing the gain stage number and according to the signal amplitude A uploaded by the detector c Calculating and outputting a level value after the gain of the stage in real time, and judging whether the intermediate frequency processing requirement is met, wherein the method specifically comprises the following steps:
calculating the level value A after the ith level gain i ：
A i ＝G 1 ×G 2 ×…×G i ×A c
ΔA i ＝A i -A 0
Wherein G is i Representing the gain of the ith stage.
Judgment A i And amplitude regulation threshold A 0 Difference of (A) Δ A i Whether or not it is larger than the voltage receiving range DeltaA 0 If yes, adjusting to the next level gain by self-adaptive gain feedback real-time calculation, making i = i +1, and calculating the level value A after the corresponding gain at the moment i 。
Step 4, calculating the noise coefficient of the signal channel of the previous i-level gain according to a formula, and judging whether the reference noise threshold NF is met A If the transmission loss meets the requirement, the next step is carried out to calculate the transmission loss; otherwise, the grade number meeting the requirement is selected according to the requirement of the noise coefficient, and the noise coefficient is generally controlled within a certain range, so that the transmission quality of the signal is controlled.
In step 4, the output total noise coefficient NF of the signal channel of the front i-level gain is calculated O Real-time trackingThe anti-blocking capability of the channel, so as to realize the stability of the large dynamic receiving of the channel, and the calculation process is as follows:
wherein NF is i Representing the noise figure of the i-th stage.
Judgment of NF 0 Whether or not the reference noise threshold NF is satisfied A If the requirements are met, the next step is carried out to calculate the propagation loss; otherwise, the grade number meeting the requirement is selected according to the requirement of the noise coefficient, and the noise coefficient is generally controlled within a certain range, so that the transmission quality of the signal is controlled.
Step 5, calculating the propagation loss, and judging whether the propagation loss meets a predetermined index L of the circuit A If yes, turning to step 3, and continuously adjusting the gain stage number through self-adaptive gain feedback; otherwise, carrying out the next step;
L i ＝10lg[1-(μ i ×ΔA i ) 2 ]
wherein mu i Is the voltage reflection coefficient. When the gain cascade reaches a certain value too much, a channel is easy to generate a larger standing-wave ratio, and isolation is needed among gain devices. The transmission loss is used as a judgment basis, so that the transmission flatness of the broadband signal is ensured, and the large dynamic receiving capacity in a signal channel of the electronic countermeasure equipment is ensured; the propagation loss of each stage is generally related to the reflection coefficient of the device of the stage, and the allowable propagation loss range can be set according to practical requirements.
Step 6, tracking and feeding back the current gain in real time, determining the gain level, and outputting a level value of the safety range, wherein the level value is as follows:
the multi-level gain fusion unit determines the gain level i, and if an attenuation channel is selected, i is less than or equal to M; if the amplification channel is selected, i ≦ N. Gain G of a single stage in general i The maximum adjustable range is about 40dB, and the gain circuit is ensured to work in a linear region as much as possible so as to prevent over-saturation and further influence the reliability of the device.
Extracting feedback gain G＝G 1 ×G 2 ×…×G i After the received front-end signal is gained by the multi-stage gain fusion unit, the level value A of the safety range is output to the rear end in comprehensive matching, and A = A i 。
Example (b):
the invention relates to a multi-order self-adaptive signal large dynamic receiving method, which comprises the following steps:
fig. 3 is a schematic diagram of a large dynamic signal receiving bandwidth, where a path of 4-stage coupled cascade amplification channel and a path of 4-stage coupled cascade attenuation channel are respectively constructed, and the gain of each stage can be adjusted to 20dB, so as to form a multi-stage gain fusion unit.
In the test procedure, the intermediate frequency bandwidths of 10mhz,20mhz and 30mhz were set, respectively, and signals of different amplitudes were input to the reception front end under verification of different intermediate frequency bandwidths, as shown below. The detector respectively detects different signal amplitudes, and the detected signal amplitudes are compared with the intermediate frequency level value A 0 Comparing, selecting corresponding gain channel, typical level amplitude A of intermediate frequency processing 0 Set to-20 dBm, and the above level value is converted into a power value calculation.
Test results show that when the broadband signals with different frequencies and different powers are targeted, the corresponding gain amount is adaptively adjusted by the multi-stage fusion gain unit, so that the energy entering the intermediate frequency signal processing is effectively compensated. With the increase of the gain series, especially for the case of selecting an attenuation channel, the normal operation can ensure 120dB attenuation, which is related to the index requirement and the selected device. The method controls the risk of the larger signal to the full load work of the device; under the condition of low-energy signals, the coupled cascade amplifier has large noise in a broadband, the power amplitude of an output signal has larger fluctuation with the set value, and the system performs equalization control on gain and channel noise, so that the management of a dynamic range and the reliability of an electronic device is realized.
The multi-order self-adaptive signal large dynamic receiving method provided by the invention can calculate feedback and bidirectional feedback of a multi-order gain fusion unit according to self-adaptive gain, fully broadens the range of received power, and is based on tracking in-band propagation loss and noise power, thereby effectively controlling the transmission quality of a channel and improving the dynamic range and stability of a receiving front end. In summary, the invention can broaden the receiving range of signals for high-frequency large-bandwidth signals, meets the requirement of the electronic countermeasure field for large dynamic signal reception, and has wide application value.
Claims (7)
1. A multi-order self-adaptive signal large dynamic receiving method is characterized by comprising the following steps:
step 1, constructing a multi-level gain fusion unit, and turning to step 2;
step 2, uploading signal amplitude A to the detector c A is prepared by c And amplitude regulation threshold A 0 Comparing, correspondingly selecting an amplification channel or an attenuation channel in the multi-stage fusion gain unit according to a comparison result, and turning to the step 3;
step 3, increasing gain stages, calculating and outputting a level value after the gain of the stage in real time according to the signal amplitude, judging whether the intermediate frequency processing requirement is met, and if the intermediate frequency processing requirement is met, turning to step 4; otherwise, turning to step 6;
step 4, calculating the noise coefficient NF of the signal channel 0 Judgment of NF 0 Whether or not the reference noise threshold NF is satisfied A If the requirements are met, the step 5 is carried out; otherwise, selecting the grade number meeting the requirement according to the noise coefficient requirement;
step 5, calculating the current cascade propagation loss L i Judgment of L i Whether or not a predetermined index L of the circuit is satisfied A If yes, turning to the step 3, and continuing to adjust the gain stage number; otherwise, go to step 6;
and 6, tracking and feeding back the current gain in real time, determining the gain stage number, and outputting a level value of the safety range.
2. The method as claimed in claim 1, wherein the multi-stage gain fusion unit in step 1 comprises a N-stage coupled cascade amplification path and an M-stage coupled cascade attenuation path in parallel, wherein the amplification gain of the N-stage coupled cascade amplification path is XH N The attenuation gain of the M-stage coupled cascade attenuation channel is XL M 。
3. The method as claimed in claim 2, wherein in step 2, the amplitude modulation threshold A is set 0 Is the value of the proposed intermediate frequency level.
4. The multi-stage adaptive signal large dynamic receiving method as claimed in claim 3, wherein in step 3, the number of gain stages is increased according to the amplitude A of the signal uploaded by the detector c Calculating and outputting a level value after the gain of the stage in real time, and judging whether the intermediate frequency processing requirement is met, wherein the method specifically comprises the following steps:
calculating the level value A after the ith level gain i ：
A i ＝G 1 ×G 2 ×…×G i ×A c
ΔA i ＝A i -A 0
Wherein G is i Represents the gain of the ith stage;
judgment A i And amplitude regulation threshold A 0 Difference Δ A of i Whether or not it is larger than the voltage receiving range DeltaA 0 If so, the gain of the next stage is adjusted through the real-time calculation of the self-adaptive gain feedback, i = i +1, and the level value A after the corresponding gain at the moment is calculated i 。
5. The method as claimed in claim 4, wherein in step 4, the noise figure of the signal channel is calculated, and the signal quality is ensured by channel adaptive control, as follows:
calculating the output total noise coefficient NF of the signal channel of the front i-stage gain O ：
Wherein NF is i Representing the noise figure of the ith stage;
judgment of NF 0 Whether or not the reference noise threshold NF is satisfied A If the transmission loss meets the requirement, the next step is carried out to calculate the transmission loss; otherwise, the grade number meeting the requirement is selected according to the requirement of the noise coefficient, and the noise coefficient is generally controlled within a certain range, so that the transmission quality of the signal is controlled.
6. The method as claimed in claim 5, wherein in step 5, the propagation loss L is calculated i ：
L i ＝10lg[1-(μ i ×ΔA i ) 2 ]
Wherein mu i Is the voltage reflection coefficient.
7. The multi-stage adaptive large dynamic signal receiving method as claimed in claim 6, wherein in step 6, the current gain is tracked and fed back in real time to determine the number of gain stages and output the level value of the safety range, which is as follows:
the multi-level gain fusion unit determines the gain level i, and if an attenuation channel is selected, i is less than or equal to M; if the amplifying channel is selected, i is less than or equal to N; extraction feedback gain G = G 1 ×G 2 ×…×G i After the received front-end signal is gained by the multi-stage gain fusion unit, the level value A of the safety range is output to the rear end in comprehensive matching, and A = A i 。
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