A microwave signal joint processing method based on a composite channel

Abstract

The application relates to the field of microwave transmission and discloses a microwave signal joint processing method based on a composite channel, which realizes joint processing of low-temperature high-sensitivity receiving channel signals and normal-temperature traditional receiving channel signals through mutual fusion, mutual verification and joint processing of the two kinds of channel signals, can significantly improve the signal-to-noise ratio and receiving accuracy of the system, and can effectively eliminate the influence of false signals, reduce the false alarm rate of a radar or electronic reconnaissance system, and protect the low-temperature high-sensitivity receiving channel from being burned out by closing the channel through a switch matrix or carrying out attenuation processing in the front end of the channel when a large signal exists.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of microwave transmission, in particular to a microwave signal joint processing method based on a composite channel. BACKGROUND

[0002] Microwave transmission is the most flexible and adaptable communication means, which is widely used in communication, radar, electronic warfare and other industries. The microwave signal receiving system is composed of an antenna aperture and a receiver. The system receiving sensitivity can be improved by increasing the receiving aperture. However, the system sensitivity and the system dynamic range are mutually restricted, and it is impossible to expand the system dynamic range while improving the system receiving sensitivity and signal detection capability.

[0003] Increasing the antenna gain Gr can improve the sensitivity of the microwave signal receiving system when the receiver sensitivity is unchanged. However, due to the limited dynamic range of the receiver, this method can improve the small signal receiving performance, but it leads to the loss of large signal receiving performance. At present, there is no system that can simultaneously consider high sensitivity and large dynamic range. At present, the processing of microwave signals is also for the processing of single-channel signals, either large dynamic signals or high sensitivity signals. There is no case of simultaneous fusion processing of high sensitivity and large dynamic. SUMMARY

[0004] The present application provides a signal joint processing method capable of simultaneously processing traditional and high-sensitivity composite channels to realize the joint processing of low-temperature high-sensitivity receiving channel signals and normal-temperature traditional receiving channel signals.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A microwave signal joint processing method based on a composite channel, the composite channel comprising a normal-temperature traditional receiving channel and a low-temperature high-sensitivity receiving channel, the joint processing method comprising a normal-temperature traditional receiving channel detection-based method and a low-temperature high-sensitivity receiving channel-based method.

[0007] The present application is realized based on a composite channel. In the composite channel, the low-temperature high-sensitivity receiving channel creates a low-temperature environment through a low-temperature control system to realize high-sensitivity reception, and the normal-temperature traditional receiving channel retains the large dynamic range of signal transmission in a normal-temperature environment. The two channels form a composite channel and work cooperatively to retain the large dynamic range while improving the transmission sensitivity. In actual measurement, the spatial electromagnetic wave signals received by the antenna are divided into two paths, one of which enters the first receiving channel and the other of which enters the second receiving channel. Correspondingly, the signal processing method is also based on a normal-temperature traditional receiving channel detection-based method and a low-temperature high-sensitivity receiving channel-based method.

[0008] Further, the signal joint processing method comprises the following steps:

[0009] S1: detecting a digital signal;

[0010] S2: judging whether there is a signal, if yes, entering step S3, if no, returning to step S1 to continue detecting;

[0011] S3: judging a channel category to which the signal belongs, and determining a detection category of step S4 according to the channel category;

[0012] S4: detecting;

[0013] S5: outputting a detection result and ending.

[0014] Further, the channel category in step S3 comprises a low-temperature high-sensitivity receiving channel and / or a normal-temperature traditional receiving channel, and the detection category comprises high-sensitivity detection or traditional detection.

[0015] Further, step S4 comprises:

[0016] S4-1: detecting mainly by high-sensitivity detection;

[0017] S4-2: detecting mainly by traditional detection.

[0018] Further, in step S3, it is judged whether the channel category is high-sensitivity and non-traditional, if yes, entering step S4-1, if no, continuing to judge.

[0019] Further, in step S3, it is judged whether the channel category is traditional and non-high-sensitivity, if yes, entering step S4-2, if no, continuing to judge.

[0020] Further, step S3 comprises:

[0021] S3-1: judging whether the channel category is high-sensitivity and traditional, if yes, entering step S3-2, if no, continuing to judge.

[0022] S3-2: judging whether the low-temperature high-sensitivity receiving channel is saturated, if yes, entering step S4-2, if no, entering step S4-1.

[0023] Further, the basis for judging whether there is a signal in step S2 of the joint processing method is to take signal arrival time and signal pulse width as the judging basis of the channel received signal.

[0024] Further, the detection category in step S3 specifically refers to:

[0025] High sensitivity detection: when the signal power is small, the normal temperature traditional receiving channel sensitivity is not enough, the low temperature high sensitivity receiving channel can receive the signal, the signal processing mode is high sensitivity detection; when the signal power is moderate, the normal temperature traditional receiving channel and the low temperature high sensitivity receiving channel can receive the signal, and the low temperature high sensitivity receiving channel is not saturated, the signal processing mode is high sensitivity detection.

[0026] Traditional detection: when the signal power is large, the low temperature high sensitivity receiving channel is saturated, and the normal temperature traditional receiving channel is normal, then a fast attenuator is placed behind the antenna (1) and in front of the low temperature high sensitivity receiving channel, the attenuator is opened quickly after saturation, and the signal processing mode is traditional detection.

[0027] When the normal temperature traditional receiving channel and the low temperature high sensitivity receiving channel are both saturated, and the low temperature high sensitivity receiving channel is still saturated after attenuation, then the low temperature high sensitivity receiving channel is closed by the switch matrix behind the antenna (1), and the normal temperature traditional receiving channel is attenuated, and the signal processing mode is normal temperature traditional receiving channel signal measurement.

[0028] When the signal is too large, the normal temperature traditional receiving channel is still saturated after attenuation, then all receiving channels are closed by the switch matrix to protect the system.

[0029] Further, when high sensitivity detection is used, only the low temperature high sensitivity receiving channel has a signal, then the low temperature high sensitivity receiving channel measures the system parameters of frequency, initial phase, arrival time, amplitude, and pulse width.

[0030] It should be noted that when the signal arrival time, signal pulse width, and signal frequency are within the preset floating range, the amplitude values of the normal temperature traditional receiving channel and the low temperature high sensitivity receiving channel are not saturated, then it is considered that the normal temperature traditional receiving channel and the low temperature high sensitivity receiving channel both receive the same signal, the frequency and initial phase of the system are taken as the measurement parameters, and the arrival time, pulse width, and amplitude are taken as the average values of the two channels as the system measurement parameters; that is, when the signal arrival time is within the range of , the signal pulse width is within the range of , the frequency is within the range of , and the amplitude and If both are not saturated, it is considered that the same signal is received by both the normal temperature traditional receiving channel and the low temperature high sensitivity receiving channel, and both channels are not saturated, and since the low temperature high sensitivity receiving channel has high signal-to-noise ratio, the frequency and initial phase are taken from the low temperature high sensitivity receiving channel, and the time of arrival, pulse width and amplitude are taken as the average of the two channels, as the system measurement parameters. At this time, although the signals of the two channels are used by the system as system parameters for calculation, but at this time the signal amplitude is in the overlapping part of the dynamic range of the two channels, that is, the dynamic range of the two channels is the same, in this case, the signal-to-noise ratio, initial phase, frequency and other parameters of the low temperature high sensitivity receiving channel are superior to the normal temperature traditional receiving channel, therefore, the system parameters are taken from the parameters of the low temperature high sensitivity receiving channel, at this time it is considered that this case is still mainly high sensitivity detection.

[0031] When the traditional detection is mainly used, when the normal temperature traditional receiving channel has a signal, the low temperature high sensitivity receiving channel has a signal Saturation, the normal temperature traditional receiving channel measurement parameters frequency, initial phase, time of arrival, amplitude, pulse width are system measurement parameters.

[0032] At this time, the low temperature high sensitivity receiving channel is saturated, and the low temperature high sensitivity receiving channel needs to be protected to prevent the channel from being damaged. When the low temperature high sensitivity receiving channel has a signal Saturation occurs, there are two ways to protect the low temperature high sensitivity receiving channel: the first protection method is to close the low temperature high sensitivity receiving channel through the antenna rear switch matrix; the second protection method is to place a fast attenuation device behind the antenna and in front of the low temperature high sensitivity receiving channel, and to quickly attenuate when saturation occurs. Since the data of the low temperature high sensitivity receiving channel has information loss at this time, such as missing initial phase information, the frequency information after attenuation can be used for complex processing, so at this time the system detection is mainly normal temperature.

[0033] Compared with the prior art, the present application has the following beneficial effects: the present application can simultaneously process the signals of the traditional and high sensitivity composite channels, and realize joint processing of the low temperature high sensitivity receiving channel signal and the normal temperature traditional receiving channel signal. The main beneficial effects of the present application are as follows:

[0034] (1) Improve the signal-to-noise ratio

[0035] The present application is based on a traditional normal temperature and low temperature high sensitivity channel composite system, and improves the signal-to-noise ratio from the following two paths, one is to receive signals through the low temperature high sensitivity receiving channel, and to rely on the low temperature high sensitivity receiving channel itself to improve the signal-to-noise ratio; the second is to measure the same signal by the low temperature high sensitivity receiving channel and the normal temperature traditional receiving channel, and to perform correlation processing to improve the signal measurement signal-to-noise ratio.

[0036] (2) Improve the receiving accuracy

[0037] Two-channel correlation detection, system parameters can take high-precision channel or two channels to calculate system parameters, which can improve the time, pulse width, amplitude and other signal parameter measurement accuracy.

[0038] (3) Reduce the false alarm rate

[0039] For signals with signal power within the signal composite measurement range, the traditional normal temperature and low temperature high sensitivity receiving channel performs correlation detection, mutual verification and joint processing, which can effectively eliminate the influence of false signals and reduce the false alarm rate of radar or electronic reconnaissance system.

[0040] (4) Channel protection

[0041] The application protects the low-temperature high-sensitivity receiving channel by closing the channel through the switch matrix or attenuating the front end of the channel, preventing the channel from being burned out. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a schematic diagram of a microwave receiving system based on a composite channel;

[0043] Figure 2 It is a schematic diagram of a microwave signal joint processing method based on a composite channel;

[0044] Figure 3 It is a schematic diagram of the dynamic range of a microwave receiving system based on a composite channel;

[0045] Figure 4 It is a schematic diagram of the fast switching and attenuation of a low-temperature high-sensitivity receiving channel. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with examples and drawings, the schematic embodiment of the present application and its description are only used to explain the present application, and not as a limitation to the present application. EMBODIMENT

[0047] A microwave signal joint processing method based on a composite channel, the composite channel includes a normal temperature traditional receiving channel and a low temperature high sensitivity receiving channel, the joint processing method includes taking the normal temperature traditional receiving channel detection as the main and taking the low temperature high sensitivity receiving channel as the main.

[0048] The present application is based on the fact that Figure 1The composite channel-based microwave receiving system shown realizes that in the composite channel, a low-temperature high-sensitivity receiving channel realizes high-sensitivity receiving through a low-temperature environmental control system to create a low-temperature environment, and a normal-temperature traditional receiving channel retains a large dynamic range of signal transmission in a normal-temperature environment, the two channels form a composite channel and work cooperatively to retain the large dynamic range while improving the transmission sensitivity. In actual measurement, the spatial electromagnetic wave signals received by an antenna are divided into two paths, one of which enters the first receiving channel and the other of which enters the second receiving channel; correspondingly, the signal processing method also mainly detects the normal-temperature traditional receiving channel and mainly detects the low-temperature high-sensitivity receiving channel.

[0049] Specifically, the signal joint processing method flow includes the following steps, as shown in Figure 2

[0050] S1: detecting a digital signal;

[0051] S2: judging whether there is a signal, if yes, entering step S3, if no, returning to step S1 to continue detecting; wherein the basis for judging whether there is a signal is to take the signal arrival time and the signal pulse width as the judgment basis of the channel received signal.

[0052] S3: judging the channel category to which the signal belongs, and determining the detection category of step S4 according to the channel category; the channel category includes a low-temperature high-sensitivity receiving channel and / or a normal-temperature traditional receiving channel, and the detection category includes mainly high-sensitivity detection or mainly traditional detection.

[0053] S4: detecting; including:

[0054] S4-1: detecting mainly in high-sensitivity detection;

[0055] S4-2: detecting mainly in traditional detection.

[0056] S5: outputting the detection result and ending.

[0057] In the step S3, three kinds of judgments need to be made,

[0058] (1) judging whether the channel category is high-sensitivity and non-traditional, if yes, entering step S4-1, if no, continuing to judge.

[0059] (2) judging whether the channel category is traditional and non-high-sensitivity, if yes, entering step S4-2, if no, continuing to judge.

[0060] (3) when the "high-sensitivity and traditional" judgment is made, the step S3 includes two steps:

[0061] ​S3-1: judging whether the channel category is high sensitivity, is traditional, if yes, entering step S3-2, if no, continuing to judge.

[0062] S3-2: judging whether the low-temperature high-sensitivity receiving channel is saturated, if yes, entering step S4-2, if no, entering step S4-1.

[0063] In the detection, the detection category specifically refers to:

[0064] High-sensitivity detection: when the signal power is small, the normal-temperature traditional receiving channel is not sensitive enough, the low-temperature high-sensitivity receiving channel can receive the signal, and the signal processing mode is high-sensitivity detection; when the signal power is moderate, the normal-temperature traditional receiving channel and the low-temperature high-sensitivity receiving channel can both receive the signal, and the low-temperature high-sensitivity receiving channel is not saturated, and the signal processing mode is high-sensitivity detection;

[0065] Traditional detection: when the signal power is large, the low-temperature high-sensitivity receiving channel is saturated, and the normal-temperature traditional receiving channel is normal, then a fast attenuator is placed in front of the low-temperature high-sensitivity receiving channel, the attenuator is opened quickly after saturation, and the signal processing mode is traditional detection;

[0066] When the normal-temperature traditional receiving channel and the low-temperature high-sensitivity receiving channel are both saturated, and the low-temperature high-sensitivity receiving channel is still saturated after attenuation, then the low-temperature high-sensitivity receiving channel is closed through the antenna switch matrix, and the normal-temperature traditional receiving channel is attenuated, and the signal processing mode is normal-temperature traditional receiving channel signal measurement;

[0067] When the signal is too large, and the normal-temperature traditional receiving channel is still saturated after attenuation, then all receiving channels are closed through the switch matrix, and the system is protected.

[0068] Further, when high-sensitivity detection is dominant, only the low-temperature high-sensitivity receiving channel has a signal, and the low-temperature high-sensitivity receiving channel measures the system measurement parameters of frequency, initial phase, arrival time, amplitude, and pulse width.

[0069] It should be noted that when the signal arrival time is in the range of , the signal pulse width is in the range of , the frequency is in the range of , and the amplitude and If neither channel is saturated, it is assumed that both the standard temperature receiving channel and the low-temperature high-sensitivity receiving channel received the same signal, and neither channel is saturated. Since the low-temperature high-sensitivity receiving channel has a higher signal-to-noise ratio, the frequency and initial phase are taken from the low-temperature high-sensitivity receiving channel values, while the arrival time, pulse width, and amplitude are taken as the average of the two channels, used as the system measurement parameters. In this case, although the signals from both channels are used by the system for parameter calculations, according to... Figure 3 As shown, the signal amplitude is in the overlapping part of the dynamic range of the two channels, that is, the dynamic range of the two channels is the same. In this case, the signal-to-noise ratio, initial phase, frequency and other parameters of the low temperature high sensitivity receiving channel are better than those of the normal temperature traditional receiving channel. Therefore, the system parameters are taken from the parameters of the low temperature high sensitivity receiving channel. In this case, it is considered that high sensitivity detection is still the main function.

[0070] When traditional detection is the primary method, a signal is present in the conventional receiving channel at room temperature, while the amplitude value of the low-temperature high-sensitivity receiving channel is [not specified]. If saturated, the conventional receiving channel measurement parameters at room temperature—frequency, initial phase, arrival time, amplitude, and pulse width—are the system measurement parameters.

[0071] At this point, the low-temperature high-sensitivity receiving channel is saturated, and it needs to be protected to prevent channel damage, such as... Figure 4 As shown. When the amplitude of the low-temperature high-sensitivity receiving channel... In the event of saturation, there are two methods to protect the low-temperature high-sensitivity receiving channel: The first method is to shut down the low-temperature high-sensitivity receiving channel by using a switch matrix behind the antenna; the second method is to place a fast attenuation device behind the antenna and in front of the low-temperature high-sensitivity receiving channel, which will quickly reduce attenuation after saturation occurs. Since the data of the low-temperature high-sensitivity receiving channel has already lost information, such as the initial phase information, the attenuated frequency information can be used for composite processing. Therefore, the system detection at this time is mainly based on room temperature.

[0072] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A method for joint processing of microwave signals based on a composite channel, wherein the composite channel includes a room-temperature conventional receiving channel and a low-temperature high-sensitivity receiving channel, characterized in that, The combined processing method includes detection primarily using a conventional receiving channel at room temperature and detection primarily using a high-sensitivity receiving channel at low temperature. The high-sensitivity receiving channel at low temperature creates a low-temperature environment through a low-temperature environmental control system to achieve high-sensitivity reception, while the conventional receiving channel at room temperature retains the dynamic range of signal transmission in a room-temperature environment. The two channels form a composite channel and operate in synergy. The signal joint processing method includes the following steps: S1: Detect digital signals; S2: Determine if there is a signal. If yes, proceed to step S3; otherwise, return to step S1 to continue the detection. S3: Determine the channel category to which the signal belongs, and determine the detection category to be performed in step S4 based on the channel category; S4: Detection; S5: Output the detection results and end; Step S4 includes: S4-1: Detection is primarily performed using high-sensitivity detection. S4-2: Testing is primarily conducted using traditional methods; The detection category in step S3 specifically refers to: High-sensitivity detection is the primary method: when the sensitivity of the conventional receiving channel at room temperature is insufficient, but the high-sensitivity receiving channel at low temperature can receive the signal, the signal processing method is high-sensitivity detection as the primary method; when both the conventional receiving channel at room temperature and the high-sensitivity receiving channel at low temperature can receive the signal, and the high-sensitivity receiving channel at low temperature is not saturated, the signal processing method is high-sensitivity detection as the primary method. Traditional detection is the primary method: When the low-temperature high-sensitivity receiving channel is saturated and the normal temperature traditional receiving channel is normal, a fast attenuation device is placed behind the antenna and in front of the low-temperature high-sensitivity receiving channel. After saturation occurs, the fast attenuation device is quickly activated, and the signal processing method is mainly traditional detection. When both the ambient temperature conventional receiving channel and the low temperature high sensitivity receiving channel are saturated, and the low temperature high sensitivity receiving channel remains saturated after attenuation, the low temperature high sensitivity receiving channel is shut down through the antenna switch matrix, and the ambient temperature conventional receiving channel is attenuated. The signal processing method is mainly conventional detection. If the conventional receiving channel at room temperature remains saturated after attenuation processing, the system will be protected by actively shutting down all receiving channels through a switch matrix.

2. The microwave signal joint processing method based on a composite channel according to claim 1, characterized in that, The channel categories mentioned in step S3 include low-temperature high-sensitivity receiving channels and / or room-temperature conventional receiving channels, and the detection categories include those that are mainly high-sensitivity detection or mainly conventional detection.

3. The microwave signal joint processing method based on a composite channel according to claim 2, characterized in that, In step S3, three judgments need to be made. The first is to determine whether the channel type is high-sensitivity and non-traditional. If yes, proceed to step S4-1; otherwise, continue to make judgments. The second method is to determine whether the channel type is traditional and not high-sensitivity. If yes, proceed to step S4-2; otherwise, continue to determine. The third type: It includes two steps: S3-1: Determine whether the channel type is high sensitivity or traditional. If yes, proceed to step S3-2; otherwise, continue the determination. S3-2: Determine whether the low-temperature high-sensitivity receiving channel is saturated. If yes, proceed to step S4-2; otherwise, proceed to step S4-1.

4. A microwave signal joint processing method based on a composite channel according to any one of claims 1-3, characterized in that, In step S2 of the joint processing method, the basis for determining whether there is a signal is the signal arrival time and the signal pulse width.

5. The microwave signal joint processing method based on a composite channel according to claim 4, characterized in that, When high-sensitivity detection is the primary method, if only the low-temperature high-sensitivity receiving channel has a signal, then the frequency, initial phase, arrival time, amplitude, and pulse width of the low-temperature high-sensitivity receiving channel are used as the system measurement parameters. If the signal arrival time, signal pulse width, and signal frequency are within the preset fluctuation range, and the amplitude values ​​of both the room-temperature conventional receiving channel and the low-temperature high-sensitivity receiving channel are not saturated, then it is considered that both the room-temperature conventional receiving channel and the low-temperature high-sensitivity receiving channel have received the same signal. The system frequency and initial phase are taken as the frequency and initial phase of the low-temperature high-sensitivity receiving channel, and the arrival time, pulse width, and amplitude are taken as the average of the two channels as the system measurement parameters. When traditional detection is the primary method, if there is a signal in the room temperature traditional receiving channel and the amplitude value of the low temperature high-sensitivity receiving channel is saturated, then the frequency, initial phase, arrival time, amplitude, and pulse width of the room temperature traditional receiving channel are used as the system measurement parameters.

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