CN115395989B - High dynamic self-adaptive control method, device, system and processing equipment - Google Patents
High dynamic self-adaptive control method, device, system and processing equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application provides a high-dynamic self-adaptive control method, a device, a system and processing equipment, which are used for controlling a transmitting antenna array to outwards send radio frequency transmitting signals with default energy values and receiving radio frequency echo signals returned by the radio frequency transmitting signals after encountering an object to be detected through a receiving antenna array. Detecting whether the energy value of the radio frequency echo signal is larger than a set dynamic threshold value, if so, adjusting the dynamic threshold value, updating the radio frequency emission signal, and controlling the emission antenna array to radiate the updated radio frequency emission signal outwards. In the scheme, when the adjustment control is performed, a linear dynamic range can be achieved by adjusting the dynamic threshold, and various defects existing in the prior art of adjusting at the receiving side can be avoided by combining the dynamic adjustment of the radio frequency transmitting signal.
Description
Technical Field
The application relates to the technical field of phased array antennas, in particular to a high-dynamic self-adaptive control method, a device, a system and processing equipment.
Background
Along with the development of various electronic technologies, more and more advanced electronic devices are put into informationized application, which makes the working electromagnetic environment of the electronic devices more and more complex. The complex electromagnetic environment has more stringent requirements on the accuracy of radars and various electronic countermeasure devices. In a conventional phased array radar system, in order to improve measurement accuracy, radiation array elements of an antenna are often increased to enhance antenna gain, but the receiver is easily saturated due to overlarge gain, so that system performance is unstable.
In the existing radar/communication, in order to avoid this, a primary amplifier, an attenuator, or a dynamic switch is usually designed at the radio frequency front end of the receiving antenna to adjust the number of the receiving antenna elements. In different use scenarios, the radio frequency front end of the receiving antenna can be in a linear working state by adjusting the number of amplifiers/attenuators or receiving array elements to change the current system radio frequency link gain. Whereas a typical radar/communication system typically requires a relatively large dynamic range in order to be able to detect signals of various strengths.
The high dynamic implementation method of the existing system is mainly realized by adjusting the receiving gain and changing the channel number of the receiving unit, and the existing method has the defects of easy signal distortion and reduced signal receiving time rate.
Disclosure of Invention
The application aims at providing a high-dynamic adaptive control method, a device, a system and processing equipment, which can realize rapid and high-dynamic gain adaptive adjustment control.
Embodiments of the application may be implemented as follows:
in a first aspect, the present application provides a highly dynamic adaptive control method, the method comprising:
controlling the transmitting antenna array to transmit radio frequency transmitting signals outwards with default energy values;
receiving a radio frequency echo signal returned by the radio frequency emission signal after encountering an object to be detected through a receiving antenna array;
detecting whether the energy value of the radio frequency echo signal is larger than a set dynamic threshold value, and if so, adjusting the dynamic threshold value and updating a radio frequency emission signal;
and controlling the transmitting antenna array to radiate the updated radio frequency transmitting signals outwards.
In an alternative embodiment, the transmitting antenna array includes a plurality of transmitting antenna array elements;
the step of updating the radio frequency transmit signal comprises one of:
closing part of the currently opened transmitting antenna array elements in the transmitting antenna array to update radio frequency transmitting signals; or (b)
The transmit excitation signal is reduced to update the radio frequency transmit signal.
In an alternative embodiment, the step of turning off a part of the currently turned-on transmit antenna elements in the transmit antenna array to update the radio frequency transmit signal includes:
according to the number Man of the currently opened transmitting antenna array elements in the transmitting antenna array and the set closing coefficient, the number Nan of the transmitting antenna array elements needing to be closed is calculated according to the following formula:
Nan＝10^(6/20)*Man
and closing part of the transmitting antenna array elements based on the calculated number of the transmitting antenna array elements to be closed so as to update the radio frequency transmitting signals.
In an alternative embodiment, the step of reducing the emission excitation signal to update the radio frequency emission signal includes:
calculating to obtain a difference value between the radio frequency echo signal and the dynamic threshold value;
and subtracting the difference value from the current radio frequency emission signal to obtain an updated radio frequency emission signal.
In an alternative embodiment, the dynamic threshold is the difference between the maximum allowable input energy of the system and the system protection margin;
the step of adjusting the dynamic threshold includes:
and reducing the system protection margin in the dynamic threshold value to increase the dynamic threshold value.
In an alternative embodiment, the step of detecting whether the energy value of the radio frequency echo signal is greater than a set dynamic threshold value includes:
performing down-conversion treatment on the radio frequency echo signals to obtain intermediate frequency signals;
analyzing the intermediate frequency signal to obtain a signal-to-noise ratio, and detecting whether the signal-to-noise ratio is larger than a set dynamic threshold.
In an alternative embodiment, the method further comprises:
if the energy value of the radio frequency echo signal is smaller than or equal to the dynamic threshold value, the current radio frequency emission signal is kept unchanged, and the current radio frequency emission signal is radiated outwards.
In a second aspect, the present application provides a highly dynamic adaptive control apparatus, the apparatus comprising:
the transmitting control module is used for controlling the transmitting antenna array to transmit radio frequency transmitting signals outwards with default energy values;
the receiving control module is used for receiving the radio frequency echo signals returned by the radio frequency transmitting signals after encountering the tested object through the receiving antenna array;
the detection module is used for detecting whether the energy value of the radio frequency echo signal is larger than a set dynamic threshold value;
the updating module is used for adjusting the dynamic threshold value and updating the radio frequency transmitting signal when the energy value of the radio frequency echo signal is larger than the set dynamic threshold value;
and the radiation module is used for controlling the transmitting antenna array to radiate the updated radio frequency transmitting signals outwards.
In a third aspect, the present application provides a processing device comprising one or more storage media and one or more processors in communication with the storage media, the one or more storage media storing processor-executable machine-executable instructions that, when the processing device is run, are executed by the processor to perform the method steps of any of the preceding embodiments.
In a fourth aspect, the present application provides a high dynamic adaptive control system, the system comprising a transmitting antenna array, a receiving antenna array and a processing device, the transmitting antenna array comprising a plurality of transmitting antenna array elements, the receiving antenna array comprising a plurality of receiving antenna array elements;
the processing device is used for sending out a transmission control signal to the transmitting antenna array and sending out a receiving control signal to the receiving antenna array;
the transmitting antenna array is used for transmitting radio frequency transmitting signals outwards with default energy values under the control of the transmitting control signals;
the receiving antenna array is used for receiving the radio frequency echo signals returned by the radio frequency transmitting signals after encountering the detected objects under the control of the receiving control signals;
the processing equipment is also used for detecting whether the energy value of the radio frequency echo signal is larger than a set dynamic threshold value, if so, adjusting the dynamic threshold value, updating the radio frequency emission signal and controlling the emission antenna array to radiate the updated radio frequency emission signal outwards.
The beneficial effects of the embodiment of the application include, for example:
the application provides a high-dynamic self-adaptive control method, a device, a system and processing equipment, which are used for controlling a transmitting antenna array to outwards send radio frequency transmitting signals with default energy values and receiving radio frequency echo signals returned by the radio frequency transmitting signals after encountering an object to be detected through a receiving antenna array. Detecting whether the energy value of the radio frequency echo signal is larger than a set dynamic threshold value, if so, adjusting the dynamic threshold value, updating the radio frequency emission signal, and controlling the emission antenna array to radiate the updated radio frequency emission signal outwards. In the scheme, when the adjustment control is performed, a linear dynamic range can be achieved by adjusting the dynamic threshold value, and various defects existing in the prior art of adjusting at the receiving side can be avoided by combining the dynamic adjustment of the radio frequency transmitting signal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a high dynamic adaptive control system according to an embodiment of the present application;
FIG. 2 is a flowchart of a highly dynamic adaptive control method according to an embodiment of the present application;
FIG. 3 is a flow chart of sub-steps included in step S103 of FIG. 2;
FIG. 4 is a flow chart of sub-steps included in step S104 of FIG. 2;
FIG. 5 is another flow chart of sub-steps included in step S104 of FIG. 2;
FIG. 6 is a graph showing SNR versus distance curves without compensation in the prior art;
FIG. 7 is a schematic diagram of MTD data without compensation operation in the prior art;
FIG. 8 is a graph showing SNR versus distance curves under an adjustment scheme in accordance with an embodiment of the present application;
FIG. 9 is a schematic diagram of MTD data under an adjustment scheme in accordance with an embodiment of the present application;
FIG. 10 is a block diagram of a processing device according to an embodiment of the present application;
fig. 11 is a functional block diagram of a high dynamic adaptive control device according to an embodiment of the present application.
Icon: 110-a storage medium; a 120-processor; 130-a high dynamic adaptive control device; 131-a transmission control module; 132-a receive control module; 133-a detection module; 134-update module; 135-radiating module; 140-communication interface.
Detailed Description
In the prior art, the manner of adjusting the receiving gain and changing the number of unit channels is often employed to achieve a highly dynamic adjustment of the radar/communication system. For example, a primary amplifier and an attenuator are designed at the radio frequency front end of the receiving antenna, or the working number of the array elements of the receiving antenna is regulated by a dynamic switch.
The prior art has a plurality of defects, for example, a limiting amplifier is adopted at the radio frequency front end of the receiving antenna, when a large-gain signal is input to the receiving antenna, the received signal is directly distorted due to the limiting operation, so that the angle test error becomes large. The mode of adopting the attenuator at the radio frequency front end of the receiving antenna can directly lead to the improvement of the noise coefficient of the radio frequency link of the whole system, and lead to the condition that the signal to noise ratio becomes low after the signal processing.
By means of the dynamic switch to regulate the number of the receiving antenna, partial array elements are turned off or turned on to change the direction pattern of the phased array directly, and the slope of the guide head is changed to result in target loss. Furthermore, the auxiliary receiving branch needs to be added to judge the number of the currently required working array elements, which can result in reduced timeliness of signal receiving. By changing the receiving gain, the angle measurement is deviated due to the inconsistent amplitude and phase between the sum and difference channels.
Based on the above research, the application provides a high dynamic self-adaptive control scheme, when the adjustment control is performed, a linear dynamic range can be achieved by adjusting a dynamic threshold value, and various defects existing in the prior art of adjusting at the receiving side can be avoided by combining the dynamic adjustment of radio frequency emission signals.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.
Referring to fig. 1, a block diagram of a high dynamic adaptive control system according to an embodiment of the present application includes a transmitting antenna array, a receiving antenna array, and a processing device. The processing device may be connected to the transmit antenna array and the receive antenna array, respectively. The transmitting antenna array comprises a plurality of transmitting antenna array elements, and the plurality of transmitting antenna array elements can be arranged in a plurality of rows and columns. The receiving antenna array comprises a plurality of receiving antenna array elements, and the plurality of receiving antenna array elements can be arranged in a plurality of rows and columns.
In particular, the transmitting antenna array may include a plurality of transmitting antennas, which may be arranged at intervals in a first direction, for example, in a horizontal direction. And the receiving antenna array includes a plurality of receiving antennas, which may be arranged at intervals in the second direction, for example, in the vertical direction.
Each transmitting antenna may comprise a plurality of transmitting antenna elements arranged at intervals, which may be arranged e.g. in a vertical direction. And each transmitting antenna element may be connected to the processing device by a feeder. Each receiving antenna may comprise a plurality of receiving antenna elements arranged at intervals, which may be arranged e.g. in a horizontal direction. Each receiving antenna element may be connected to the processing device by a feeder.
The transmitting antenna array element and the receiving antenna array element can be connected with the processing equipment through the radio frequency chip. The radio frequency chip may include a transmitter and a receiver. The transmitting antenna array element may be connected to the processing device by a transmitter, and the receiving antenna array element may be connected to the processing device by a receiver.
Each transmitting antenna array element can be used for transmitting a transmitting signal for scanning detection, and each receiving antenna array element can be used for receiving an echo signal of the transmitting signal for positioning and tracking a tested object.
In addition, in another possible implementation manner, a transceiver unit integrating manner may be adopted, that is, the transmitting antenna array and the receiving antenna array use the same antenna array element, and the transceiver working state of the antenna array element is switched through the T/R switch.
In this embodiment, the processing device may be a signal processor, and the above-described configuration of the high dynamic adaptive control system is merely illustrative, and the system may have other devices in addition to the above-described devices. For example, a channel extension may also be included for enabling conversion and transfer of signals between the processing device and the transmit antenna array, the receive antenna array. In addition, a power module may be included for powering the transmit antenna array, the receive antenna array, the processing device, and the like, respectively.
In this embodiment, the processing device may be configured to send a transmission control signal to the transmitting antenna array and send a reception control signal to the receiving antenna array.
The transmit antenna array may be used to transmit radio frequency transmit signals outwardly at a default energy value under control of a transmit control signal. The receiving antenna array can be used for receiving radio frequency echo signals returned by radio frequency transmitting signals after encountering an object to be detected under the control of receiving control signals. The processing equipment can detect whether the energy value of the radio frequency echo signal is larger than a set dynamic threshold value, if so, the dynamic threshold value is adjusted, the radio frequency emission signal is updated, and the emission antenna array is controlled to radiate the updated radio frequency emission signal outwards.
The high-dynamic self-adaptive control system provided by the embodiment can achieve a linear dynamic range through adjusting the dynamic threshold value, and can realize rapid and high-dynamic gain self-adaptive control adjustment by combining the dynamic adjustment of radio frequency transmitting signals, so that various defects existing in the adjustment at the receiving side in the prior art can be avoided.
Referring to fig. 2, a flowchart of a high dynamic adaptive control method according to an embodiment of the present application may be implemented by the high dynamic adaptive control system, or may be implemented by a separate processing device. The specific flow shown in fig. 2 will be described in detail.
S101, controlling the transmitting antenna array to send out radio frequency transmitting signals with default energy values.
S102, receiving the radio frequency echo signals returned by the radio frequency emission signals after encountering the object to be detected through a receiving antenna array.
S103, detecting whether the energy value of the radio frequency echo signal is larger than a set dynamic threshold value, and if so, executing the following step S104.
S104, adjusting the dynamic threshold value and updating the radio frequency transmission signal.
S105, controlling the transmitting antenna array to radiate the updated radio frequency transmitting signals outwards.
In this embodiment, the transmit antenna array may be controlled to emit a radio frequency transmit signal at an initialized or default energy value prior to adjustment. The emitted radio frequency emission signal returns a radio frequency echo signal after encountering the object to be detected. When the energy value of the rf transmit signal is large, or the distance between the object to be measured and the transmit antenna array is small, the energy value of the received rf echo signal may be large.
When the distance between the measured object and the system is smaller, the intensity of the received radio frequency echo signal is larger, and when the energy of the received radio frequency echo signal is too large, the front end of the receiving antenna array is in a deep saturation compression state, so that the signal-to-noise ratio of detection is reduced.
Therefore, in this embodiment, the detection of the received rf echo signal will be adjusted accordingly. Alternatively, it may be detected whether the energy value of the received radio frequency echo signal is greater than a set dynamic threshold, i.e. a threshold that is adjustable and variable within a certain range. If the energy value of the received radio frequency echo signal is larger than the set dynamic threshold value, the dynamic threshold value can be adjusted first, and the radio frequency transmitting signal is updated at the same time. And controlling the transmitting antenna array to radiate the updated radio frequency transmitting signals outwards.
In addition, if the energy value of the radio frequency echo signal is smaller than or equal to the dynamic threshold value, the current radio frequency transmitting signal is kept unchanged, and the transmitting antenna array is controlled to radiate the current radio frequency transmitting signal outwards.
In this embodiment, when the radio frequency echo signal is detected to be greater than the set dynamic threshold, the dynamic threshold is adjusted, so that the adjusted dynamic threshold can be used for judgment in the subsequent detection judgment, so as to achieve the purpose of a linear dynamic range. In addition, by updating the radio frequency transmitting signal, the condition that the front end of the receiving antenna array is in a deep saturation compression state under the condition that the radio frequency echo signal is too large can be avoided. In addition, since the device setting or adjustment is not needed on the receiving side, the defects of signal distortion, signal receiving time rate reduction and the like in the prior art can be avoided.
In this embodiment, referring to fig. 3, in the step of receiving the rf echo signal to detect whether the energy value of the rf echo signal is greater than the set dynamic threshold, the method may include the following steps:
s1031, performing down-conversion processing on the radio frequency echo signals to obtain intermediate frequency signals.
S1032, analyzing the intermediate frequency signal to obtain a signal-to-noise ratio, and detecting whether the signal-to-noise ratio is larger than a set dynamic threshold.
In this embodiment, after the system is turned on, all default transmitting antenna elements are turned on, and the excitation power of the radio frequency transmitting signal is a default value. The transmitting antenna array radiates the radio frequency transmitting signal, and the receiving antenna array receives the radio frequency echo signal corresponding to the radio frequency transmitting signal. The processing device can mix the radio frequency echo signals to intermediate frequency signals, and analyze and process the intermediate frequency signals to output corresponding detection values such as signal-to-noise ratio and the like.
Or the receiving antenna array can also transmit the radio frequency echo signals to the channel extension, the channel extension performs down-conversion processing to convert the radio frequency echo signals into intermediate frequency signals, and the processed intermediate frequency signals are transmitted to the processing equipment for signal processing so as to obtain values such as signal-to-noise ratio and the like.
The processing device may compare the resulting signal-to-noise ratio to a set dynamic threshold to determine whether the signal-to-noise ratio is greater than the set dynamic threshold. And then make a corresponding adjustment based on the result of the comparison.
In this embodiment, as can be seen from the above description, the dynamic threshold is a threshold that is set to be variable within a certain range. The dynamic threshold is the difference between the maximum allowable input energy of the system and the system protection margin. In the step of adjusting the dynamic threshold, the following may be implemented:
and reducing the system protection margin in the dynamic threshold value to increase the dynamic threshold value.
In this embodiment, the maximum allowable input energy of the system in the dynamic threshold may be understood as the input energy in the saturated state of the system, and the receiving saturation is avoided by subtracting a system protection margin from the maximum allowable input energy of the system. As the distance between the measured object and the system gets closer, the energy of the received radio frequency echo signal gets larger, so as to ensure that the receiving saturation can be avoided, the system protection margin in the dynamic threshold can be reduced, and the dynamic threshold is increased as a whole. Under the condition that the distance between the measured object and the system is gradually increased and the energy of the radio frequency echo signal is increased, the dynamic threshold value is correspondingly increased, and the condition for adjusting and triggering is correspondingly changed, so that the adjustment of a linear dynamic range is achieved.
In addition, in the embodiment, on the basis of the above, the radio frequency transmission signal is updated and adjusted. The way to update the radio frequency transmit signal may be by adjusting the transmit excitation gain or by adjusting the transmit operating channel.
In one possible implementation manner, the manner of adjusting the transmitting working channel may be to close a part of transmitting antenna elements in the currently opened transmitting antenna elements in the transmitting antenna array so as to update the radio frequency transmitting signal.
In this implementation, the number of transmit antenna elements that are turned off may be determined according to the amount of power that the system needs to attenuate, e.g., if the system needs to attenuate by 6dB, the transmit antenna elements that are turned off may be half the transmit antenna elements before they are turned off. For another example, when the dynamic range of the system is further increased by closing part of the transmitting antenna array elements under the original dynamic range of the system, the dynamic range can reach about 12dB when the transmitting antenna array elements are closed to 1/4 of the number of the original transmitting antenna array elements.
Referring to fig. 4, in one possible implementation manner, the updating of the radio frequency transmission signal may be implemented by:
S1041A, according to the number Man of the currently opened transmitting antenna array elements in the transmitting antenna array and the set closing coefficient, calculating the number Nan of the transmitting antenna array elements required to be closed according to the following formula: nan=10++6/20) ×man.
S1042A, closing part of the transmitting antenna array elements based on the calculated quantity of the transmitting antenna array elements to be closed so as to update the radio frequency transmitting signals.
In this embodiment, the number of the transmitting antenna elements to be turned off is calculated based on the number of the transmitting antenna elements that are originally turned on, that is, the currently turned on transmitting antenna elements, so as to turn off part of the transmitting antenna elements. Under the condition that part of the transmitting antenna array elements are closed, the energy of the radio frequency transmitting signals is correspondingly reduced, and correspondingly, the energy of the received radio frequency receiving signals is correspondingly reduced. Therefore, when the measured object is positioned at the near-end distance of the seeker, the seeker receives the signal within an acceptable dynamic range, and the seeker can work normally.
Compared with the defect that in the prior art, the phased array directional diagram is changed and the slope of the guide head is changed by adjusting the number of the receiving antenna working array elements, so that the target is lost, in the embodiment, the high dynamic range adjustment is realized by adjusting the transmitting antenna array elements, after the transmitting antenna array elements are adjusted, the transmitting directional diagram is changed, but the receiving antenna directional diagram is not changed, the slope of the guide head is not influenced, and the defect that the target is lost can be avoided.
Furthermore, in another possible implementation, the updating of the radio frequency transmit signal may be achieved by adjusting the transmit excitation gain. In this manner, the radio frequency transmit signal may be updated by reducing the transmit excitation signal.
In particular, referring to fig. 5, this implementation may be achieved by:
and S1041B, calculating and obtaining the difference value between the radio frequency echo signal and the dynamic threshold value.
S1042B, subtracting the difference value from the current radio frequency emission signal to obtain an updated radio frequency emission signal.
In this embodiment, when the energy value of the received rf echo signal is greater than the set dynamic threshold, a portion of the rf echo signal greater than the dynamic threshold may be subtracted based on the current rf transmit signal. And when the system does not reach the saturated state, the dynamic threshold value is defined by the difference between the maximum allowable input energy of the system and the system protection margin: PMAX-PY.
If the rf echo signal is denoted as P1, the portion of the rf echo signal that is greater than the dynamic threshold may be expressed as: p1- (PMAX-PY). When the current radio frequency emission signal is recorded as Pm, the part of the radio frequency echo signal larger than the dynamic threshold value can be subtracted on the basis of the radio frequency emission signal to obtain an updated radio frequency emission signal, namely: pm- (P1- (PMAX-PY)).
In this way, the energy of the radio frequency transmission signal transmitted by the subsequent transmitting antenna array is correspondingly reduced, so as to avoid receiving saturation.
In this embodiment, a closed loop system integrating signal processing, threshold determination and link control is designed by the high dynamic adaptive control system. The input signals under different conditions can be processed by the processing equipment, and threshold judgment is carried out by the program to determine whether the operations of changing the transmitting excitation signal, switching the transmitting antenna array element and the like are needed. The gain self-adaptive adjustment control with high speed and high dynamic can be realized.
In this embodiment, please refer to fig. 6 and 7, which are the SNR (signal-to-noise ratio) -distance curve and the MTD (Moving target detector, moving object detection) data at the signal saturation point when the seeker does not perform any compensation operation. Fig. 8 and 9 show SNR-distance curves and MTD data at signal saturation points after compensation operation under the control scheme of the present embodiment.
As can be seen from fig. 6, when no compensation operation is performed, as the measured object approaches, the energy intensity of the radio frequency echo signal is larger and larger, and when the relative distance between the measured object and the guide head is about 500m, the received energy is too large, so that the front end of the receiving antenna is in a deep saturated compression state, resulting in a reduction in the signal-to-noise ratio of the detection, and a reduction in the measurement accuracy. As can be seen from fig. 8, after the compensation by the control method provided in this embodiment, the signal supersaturation state as in fig. 6 does not occur when the object to be measured is at the proximal end.
In addition, as can be seen from fig. 7 and 9, the energy is larger when the object to be measured is at the proximal end without any compensation operation. And under the condition of dynamically adjusting the number of the array element channels of the transmitting antenna, the near-end energy becomes weak and is in the acceptable dynamic range of the seeker.
According to the high-dynamic self-adaptive control method provided by the embodiment, when the adjustment is performed, the dynamic threshold value formed by the difference value between the maximum allowable input energy of the system and the system protection margin is adjusted, so that the subsequent adjustment triggering condition is changed, and the aim of adjusting the linear dynamic range is fulfilled. Meanwhile, the intensity of the transmitting excitation signal or the working channel of the array element of the transmitting antenna is dynamically adjusted according to the intensity of the receiving signal to realize the high-dynamic system adjustment, so that various defects existing in the prior art of adjustment at the receiving side can be avoided.
Referring to fig. 10, a schematic diagram of exemplary components of a processing device according to an embodiment of the present application may be a signal processor or the like capable of completely implementing a high dynamic adaptive control method. The processing device may include a storage medium 110, a processor 120, a high dynamic adaptive control apparatus 130, and a communication interface 140. In this embodiment, the storage medium 110 and the processor 120 are both located in the processing device and are separately disposed. However, it should be understood that the storage medium 110 may also be separate from the processing device and accessible by the processor 120 through a bus interface. Alternatively, the storage medium 110 may be integrated into the processor 120, for example, as a cache and/or general purpose registers.
The high dynamic adaptive control apparatus 130 may be understood as the above-mentioned processing device, or the processor 120 of the processing device, or may be understood as a software functional module for implementing the above-mentioned high dynamic adaptive control method under the control of the processing device, independently of the above-mentioned processing device or the processor 120.
As shown in fig. 11, the high dynamic adaptive control apparatus 130 may include a transmission control module 131, a reception control module 132, a detection module 133, an update module 134, and a radiation module 135. The functions of the respective functional modules of the high dynamic adaptive control apparatus 130 are described in detail below.
A transmitting control module 131, configured to control the transmitting antenna array to send out a radio frequency transmitting signal with a default energy value;
it will be appreciated that the emission control module 131 may be used to perform step S101 described above, and reference may be made to the details of implementation of the emission control module 131 as described above with respect to step S101.
The receiving control module 132 is configured to receive, through a receiving antenna array, a radio frequency echo signal returned by the radio frequency transmitting signal after encountering the object to be detected;
it will be appreciated that the receiving control module 132 may be configured to perform the step S102 described above, and reference may be made to the details of the implementation of the receiving control module 132 regarding the step S102 described above.
A detection module 133, configured to detect whether an energy value of the radio frequency echo signal is greater than a set dynamic threshold;
it will be appreciated that the detection module 133 may be used to perform step S103 described above, and reference may be made to the details of the implementation of the detection module 133 as described above with respect to step S103.
An updating module 134, configured to adjust the dynamic threshold and update the radio frequency transmit signal when the energy value of the radio frequency echo signal is greater than the set dynamic threshold;
it is understood that the update module 134 may be used to perform the step S104 described above, and reference may be made to the details of the implementation of the update module 134 regarding the step S104 described above.
And the radiation module 135 is used for controlling the transmitting antenna array to radiate the updated radio frequency transmitting signal outwards.
It will be appreciated that the irradiation module 135 may be used to perform step S105 described above, and reference may be made to the details of the implementation of the irradiation module 135 with respect to step S105 described above.
In one possible implementation, the transmitting antenna array includes a plurality of transmitting antenna elements, and the updating module 134 is configured to:
closing part of the currently opened transmitting antenna array elements in the transmitting antenna array to update radio frequency transmitting signals; or (b)
The transmit excitation signal is reduced to update the radio frequency transmit signal.
In one possible implementation, the update module 134 is configured to:
according to the number Man of the currently opened transmitting antenna array elements in the transmitting antenna array and the set closing coefficient, the number Nan of the transmitting antenna array elements needing to be closed is calculated according to the following formula:
Nan＝10^(6/20)*Man
and closing part of the transmitting antenna array elements based on the calculated number of the transmitting antenna array elements to be closed so as to update the radio frequency transmitting signals.
In one possible implementation, the update module 134 is configured to:
calculating to obtain a difference value between the radio frequency echo signal and the dynamic threshold value;
and subtracting the difference value from the current radio frequency emission signal to obtain an updated radio frequency emission signal.
In one possible implementation, the dynamic threshold is a difference between the maximum allowable input energy of the system and the system protection margin, and the update module 134 is configured to:
and reducing the system protection margin in the dynamic threshold value to increase the dynamic threshold value.
In one possible implementation, the detection module 133 is configured to:
performing down-conversion treatment on the radio frequency echo signals to obtain intermediate frequency signals;
analyzing the intermediate frequency signal to obtain a signal-to-noise ratio, and detecting whether the signal-to-noise ratio is larger than a set dynamic threshold.
In one possible implementation, the radiation module 135 is further configured to:
and when the energy value of the radio frequency echo signal is smaller than or equal to the dynamic threshold value, keeping the current radio frequency emission signal unchanged and radiating the current radio frequency emission signal outwards.
The process flow of each module in the apparatus and the interaction flow between the modules may be described with reference to the related descriptions in the above method embodiments, which are not described in detail herein.
Further, the embodiment of the application also provides a computer readable storage medium, and the computer readable storage medium stores machine executable instructions, which when executed, implement the high dynamic adaptive control method provided by the above embodiment.
In particular, the computer readable storage medium can be a general-purpose storage medium, such as a removable disk, a hard disk, or the like, and the computer program on the computer readable storage medium can execute the above-described highly dynamic adaptive control method when executed. With respect to the processes involved in the computer readable storage medium and when executed as executable instructions thereof, reference is made to the relevant descriptions of the method embodiments described above and will not be described in detail herein.
In summary, the method, the device, the system and the processing equipment for high dynamic self-adaptive control provided by the embodiment of the application control the transmitting antenna array to send out the radio frequency transmitting signal with the default energy value, and receive the radio frequency echo signal returned by the radio frequency transmitting signal after encountering the object to be detected through the receiving antenna array. Detecting whether the energy value of the radio frequency echo signal is larger than a set dynamic threshold value, if so, adjusting the dynamic threshold value, updating the radio frequency emission signal, and controlling the emission antenna array to radiate the updated radio frequency emission signal outwards. In the scheme, when the adjustment control is performed, a linear dynamic range can be achieved by adjusting the dynamic threshold, and various defects existing in the prior art of adjusting at the receiving side can be avoided by combining the dynamic adjustment of the radio frequency transmitting signal.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present application should be included in the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A method of high dynamic adaptive control, the method comprising:
controlling the transmitting antenna array to transmit radio frequency transmitting signals outwards with default energy values;
receiving a radio frequency echo signal returned by the radio frequency emission signal after encountering an object to be detected through a receiving antenna array;
detecting whether the energy value of the radio frequency echo signal is larger than a set dynamic threshold value, and if so, adjusting the dynamic threshold value and updating a radio frequency emission signal;
controlling the transmitting antenna array to radiate the updated radio frequency transmitting signals outwards;
the dynamic threshold is a difference value between the maximum allowable input energy of the system and a system protection margin, and the step of adjusting the dynamic threshold includes:
and reducing the system protection margin in the dynamic threshold value to increase the dynamic threshold value.
2. The method of claim 1, wherein the transmit antenna array comprises a plurality of transmit antenna array elements;
the step of updating the radio frequency transmit signal comprises one of:
closing part of the currently opened transmitting antenna array elements in the transmitting antenna array to update radio frequency transmitting signals; or (b)
The transmit excitation signal is reduced to update the radio frequency transmit signal.
3. The method of claim 2, wherein the step of reducing the transmit excitation signal to update the radio frequency transmit signal comprises:
calculating to obtain a difference value between the radio frequency echo signal and the dynamic threshold value;
and subtracting the difference value from the current radio frequency emission signal to obtain an updated radio frequency emission signal.
4. The method according to claim 1, wherein the step of detecting whether the energy value of the radio frequency echo signal is greater than a set dynamic threshold value comprises:
performing down-conversion treatment on the radio frequency echo signals to obtain intermediate frequency signals;
analyzing the intermediate frequency signal to obtain a signal-to-noise ratio, and detecting whether the signal-to-noise ratio is larger than a set dynamic threshold.
5. The high dynamic adaptive control method according to claim 1, characterized in that the method further comprises:
if the energy value of the radio frequency echo signal is smaller than or equal to the dynamic threshold value, the current radio frequency emission signal is kept unchanged, and the current radio frequency emission signal is radiated outwards.
6. A high dynamic adaptive control apparatus, the apparatus comprising:
the transmitting control module is used for controlling the transmitting antenna array to transmit radio frequency transmitting signals outwards with default energy values;
the receiving control module is used for receiving the radio frequency echo signals returned by the radio frequency transmitting signals after encountering the tested object through the receiving antenna array;
the detection module is used for detecting whether the energy value of the radio frequency echo signal is larger than a set dynamic threshold value;
the updating module is used for adjusting the dynamic threshold value and updating the radio frequency transmitting signal when the energy value of the radio frequency echo signal is larger than the set dynamic threshold value;
the radiation module is used for controlling the transmitting antenna array to radiate the updated radio frequency transmitting signals outwards;
the dynamic threshold is a difference value between the maximum allowable input energy of the system and a system protection margin, and the updating module is used for:
and reducing the system protection margin in the dynamic threshold value to increase the dynamic threshold value.
7. A processing device comprising one or more storage media and one or more processors in communication with the storage media, the one or more storage media storing processor-executable machine-executable instructions that, when the processing device is run, are executed by the processor to perform the method steps recited in any of claims 1-5.
8. A high dynamic adaptive control system, wherein the system comprises a transmitting antenna array, a receiving antenna array and processing equipment, wherein the transmitting antenna array comprises a plurality of transmitting antenna array elements, and the receiving antenna array comprises a plurality of receiving antenna array elements;
the processing device is used for sending out a transmission control signal to the transmitting antenna array and sending out a receiving control signal to the receiving antenna array;
the transmitting antenna array is used for transmitting radio frequency transmitting signals outwards with default energy values under the control of the transmitting control signals;
the receiving antenna array is used for receiving the radio frequency echo signals returned by the radio frequency transmitting signals after encountering the detected objects under the control of the receiving control signals;
the processing equipment is also used for detecting whether the energy value of the radio frequency echo signal is larger than a set dynamic threshold value, if so, adjusting the dynamic threshold value and updating the radio frequency emission signal, and controlling the emission antenna array to radiate the updated radio frequency emission signal outwards;
the dynamic threshold is a difference between a maximum allowable input energy of the system and a system protection margin, and the processing device is configured to:
and reducing the system protection margin in the dynamic threshold value to increase the dynamic threshold value.
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| US3829858A (en) * | 1972-02-28 | 1974-08-13 | Philips Corp | Arrangement in a radar equipment for indicating a variable threshold level on the indicator |
| CN102331573A (en) * | 2010-07-06 | 2012-01-25 | 古野电气株式会社 | Method and device for setting threshold, and method and device for detecting target object |
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| CN112180352A (en) * | 2020-08-24 | 2021-01-05 | 西安空间无线电技术研究所 | High-integration-level comprehensive radio frequency sensing array system |
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| JP5697911B2 (en) * | 2010-07-06 | 2015-04-08 | 古野電気株式会社 | Threshold setting method, target detection method, threshold setting program, target detection program, and target detection apparatus |
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| US3829858A (en) * | 1972-02-28 | 1974-08-13 | Philips Corp | Arrangement in a radar equipment for indicating a variable threshold level on the indicator |
| CN102331573A (en) * | 2010-07-06 | 2012-01-25 | 古野电气株式会社 | Method and device for setting threshold, and method and device for detecting target object |
| CN111965626A (en) * | 2020-08-11 | 2020-11-20 | 上海禾赛科技股份有限公司 | Echo detection and correction method and device for laser radar and environment sensing system |
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