CN113872709A - System for continuously monitoring existence of high-speed signals - Google Patents
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Abstract
The invention provides a system for continuously monitoring the existence of high-speed signals, which relates to the technical field of high-speed signal monitoring, and comprises the following steps: the device comprises a main control unit, a high-speed signal acquisition unit, a signal dispersion degree calculation unit and a filtering and judgment unit; the main control unit: controlling data sampling and derivation of a high-speed signal acquisition unit, and controlling numerical calculation of a signal dispersion calculation unit and a filtering and judging unit; high-speed signal acquisition unit: comprises a high-speed SAR (successive approximation register type) ADC (analog-digital converter) sampling and data deriving circuit; a signal dispersion calculation unit: calculating the mean value and the average difference of the high-speed SAR ADC sampling point data; a filtering and judging unit: the method comprises the steps of judging whether a signal exists or not according to a hysteresis threshold, accumulating the number of continuous cycles of no signal and outputting a judgment result of whether the signal exists or not. The invention can reduce the resource requirements on the MCU (micro control unit) and the corresponding circuit, shorten the judgment time of the existence of the signal and reduce the misjudgment rate of the existence of the signal.
Description
Technical Field
The invention relates to the technical field of high-speed signal monitoring, in particular to a system for continuously monitoring the existence of high-speed signals.
Background
The monitoring of the presence or absence of the high-speed signal plays an important role in reporting the LOS (LOSs of signal) in the high-speed communication system and the operation related to the LOS in the high-speed communication system.
The invention patent with publication number CN107800512A discloses a signal detection device and method, comprising: the device comprises a signal monitoring module and a signal processing module. The signal processing module is connected in series on the high-speed data path, the input end of the signal monitoring module is connected with the high-speed data path, and the output end of the signal monitoring module is connected with the signal processing module. When the signal monitoring module detects that no effective signal transmission exists in the high-speed signal path, the detection result is transmitted to the signal processing module, and the signal processing module is in a standby power-saving mode; when the signal monitoring module detects that the low-frequency periodic signal LFPS is transmitted in the high-speed signal path, the signal processing module does not perform any amplitude attenuation processing on the input signal; when the signal monitoring module detects that the high-speed data packet signal is transmitted in the high-speed signal path, the signal processing module performs corresponding processing on the input signal according to the preset configuration.
At present, the existence of a plurality of high-speed signals is monitored by calculating the variance or standard deviation of signal sampling point data, if the calculation is realized by a solidified digital hardware circuit, the requirement on the complexity of the hardware circuit is higher, and if the calculation is realized by software programming of an MCU, the requirement on the resources of the MCU and the occupation of the resources are higher.
Disclosure of Invention
In view of the deficiencies in the prior art, the present invention provides a system for continuously monitoring the presence of high speed signals.
According to the system for continuously monitoring the existence of the high-speed signal, the scheme is as follows:
a system for continuously monitoring for the presence of high speed signals, the system comprising: the device comprises a main control unit, a high-speed signal acquisition unit, a signal dispersion degree calculation unit and a filtering and judgment unit;
the main control unit: controlling data sampling and derivation of a high-speed signal acquisition unit, and controlling numerical calculation of a signal dispersion calculation unit and a filtering and judging unit;
high-speed signal acquisition unit: the SAR ADC sampling circuit comprises a high-speed SAR ADC sampling circuit and a data derivation circuit, wherein the output end of the high-speed SAR ADC sampling circuit is connected with the input end of the data derivation circuit;
a signal dispersion calculation unit: connecting the output end of the data deriving circuit, and calculating the mean value and the average difference of the data of the high-speed SAR ADC sampling points;
a filtering and judging unit: and judging whether the signal exists or not and accumulating the continuous cycle number of the signal without the signal according to the hysteresis threshold based on the average value and the average difference.
Preferably, the main control unit, the signal dispersion calculation unit and the filtering and judgment unit are all implemented by software programming of the MCU or implemented by a solidified digital circuit.
Preferably, the sampling of the high-speed SAR ADC in the high-speed signal acquisition unit includes: and directly sampling the high-speed signal, or sampling a certain path of output signal obtained by carrying out frequency reduction on the high-speed signal.
Preferably, the data derivation circuit in the high-speed signal acquisition unit needs to send a continuous section of high-speed SAR ADC sampling point data to the signal dispersion calculation unit and store the data in the cache, and the sampling point corresponding to the high-speed SAR ADC sampling point data needs to be capable of reflecting the overall amplitude characteristic of the signal.
Preferably, the signal dispersion calculation unit includes:
calculating an arithmetic mean value of the obtained continuous high-speed SAR ADC sampling point data;
and calculating absolute values of deviations of all the high-speed SAR ADC sampling point data and the arithmetic mean, accumulating the absolute values of all the deviations, and calculating the mean value to obtain the mean difference for representing the signal dispersion.
Preferably, in the filtering and deciding unit: the hysteresis threshold comprises a signal dispersion high threshold and a signal dispersion low threshold, and both the thresholds can be configured;
accumulation of number of no-signal sustained cycles: to a no-signal duration period maximum limit value configurable;
the signal presence or absence decision result is the current state, and the signal dispersion degree of the previous state and the current period is required to be obtained.
Preferably, the filtering and decision logic of the filtering and decision unit is as follows:
when the previous state is a signal, if the signal dispersion of the period is smaller than the signal dispersion low threshold, the number of the non-signal continuous periods is increased by 1;
if the updated no-signal continuous period number exceeds the maximum limit value of the no-signal continuous period number, the no-signal continuous period number is limited to the maximum limit value, and the current state output result is no-signal, otherwise, the current state output result is signal.
Preferably, when the previous state is a signal, if the signal dispersion of the period is not less than the signal dispersion low threshold, the number of the no-signal continuous periods is reduced by 1, and the output result of the current state is a signal;
if the number of the non-signal duration periods after the updating is less than 0, the number of the non-signal duration periods is limited to 0.
Preferably, when the previous state is no signal, if the signal dispersion of the period is greater than the signal dispersion high threshold, the number of continuous periods of no signal is reduced by 1;
if the updated no-signal continuous periodicity is less than 0, the no-signal continuous periodicity is limited to 0, and the current state output result is a signal, otherwise the current state output result is no-signal.
Preferably, when the previous state is no signal, if the signal dispersion of the period is not greater than the signal dispersion high threshold, the number of the continuous periods of no signal is increased by 1, and the output result of the current state is no signal;
if the updated number of the no-signal duration periods exceeds the maximum limit value of the no-signal duration periods, the number of the no-signal duration periods is limited to the maximum limit value.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can quickly judge whether the signal exists or not, reduce the time and space complexity of calculation by adopting the MCU or the corresponding circuit, reduce the resource requirements on the MCU and the corresponding circuit and shorten the judgment time of whether the signal exists or not;
2. by adopting the mode of carrying out hysteresis judgment and accumulation on the continuous periodicity of no signal, the jitter in the signal sampling data is filtered out, and the misjudgment rate of the existence of the signal is reduced.
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Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is an overall structural view of the present invention;
fig. 2 is a schematic diagram of filtering and decision logic.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
An embodiment of the present invention provides a system for continuously monitoring the presence or absence of a high-speed signal, which is shown in fig. 1 and includes: the device comprises a main control unit, a high-speed signal acquisition unit, a signal dispersion degree calculation unit and a filtering and judgment unit.
The main control unit is used for periodically controlling data sampling and derivation of the high-speed signal acquisition unit and controlling numerical calculation of the signal dispersion calculation unit and the filtering and judgment unit, and can be realized by software programming of the MCU or a solidified digital circuit.
High-speed signal acquisition unit: the SAR ADC sampling circuit comprises a high-speed SAR ADC sampling circuit and a data derivation circuit; the output end of the high-speed SAR ADC sampling circuit is connected with the input end of the data deriving circuit; the high-speed SAR ADC sampling can be directly sampling a high-speed signal, and can also be used for sampling a certain output signal obtained by carrying out frequency reduction on the high-speed signal.
And the data export circuit needs to send a section of continuous high-speed SAR ADC sampling point data to the signal dispersion calculation unit and store the data in a cache, the number of sampling points corresponding to the section of continuous sampling point data is not too small, and the sampling points corresponding to the high-speed SAR ADC sampling point data need to reflect the integral amplitude characteristic of the signal.
A signal dispersion calculation unit: and connecting the output end of the data export circuit to obtain the high-speed SAR ADC sampling point data, and calculating the mean value and the average difference of the high-speed SAR ADC sampling point data.
The signal dispersion degree calculating unit firstly calculates an arithmetic mean value of the obtained continuous high-speed SAR ADC sampling point data, then calculates absolute values of deviations of all the high-speed SAR ADC sampling point data and the arithmetic mean value, accumulates the absolute values of all the deviations, and calculates the mean value to obtain a mean difference for representing the signal dispersion degree, wherein the specific formula is as follows:
A filtering and judging unit: and comparing the average difference with a hysteresis comparison threshold based on the average difference, judging whether a signal exists, accumulating the continuous periodicity without the signal, and finally outputting a judgment result whether the signal exists or not.
In order to prevent the comparison result of the average difference and the decision threshold from continuously and repeatedly changing when the average difference of the signals is continuously close to the decision threshold, the decision threshold adopts a hysteresis comparison threshold. The hysteresis comparison threshold comprises a signal dispersion high threshold and a signal dispersion low threshold, and both the thresholds can be configured. The value of the signal dispersion high threshold is larger than that of the signal dispersion low threshold, the signal dispersion high threshold is used for judging whether a signal exists or not, and the signal dispersion low threshold is used for judging whether the signal exists or not; "number of no signal on-duration periods" accumulated relates to a maximum limit value for the no signal on-duration periods, which value is configurable; the signal presence/absence decision result is the current state, and its obtaining needs to depend on the signal dispersion of the previous state (i.e. the decision result of the previous cycle) and the current cycle. The filtering and judging unit can be realized by software programming of the MCU, and can also be realized by a solidified digital circuit.
Referring to fig. 2, the filtering and decision logic of the filtering and decision unit is as follows:
when the previous state is 'signal', if the signal dispersion of the period is less than the signal dispersion low threshold, the 'no-signal continuous period number' is increased by 1, if the updated 'no-signal continuous period number' exceeds the maximum limit value of the no-signal continuous period, the 'no-signal continuous period number' is limited to the maximum limit value, the current state output result is 'no signal', otherwise, the current state output result is 'signal';
if the signal dispersion of the period is not less than the signal dispersion low threshold, the number of the "no-signal continuous periods" is reduced by 1, the current state output result is "signal present", and if the updated number of the "no-signal continuous periods" is less than 0, the number of the "no-signal continuous periods" is limited to 0.
When the previous state is 'no signal', if the signal dispersion of the period is greater than the signal dispersion high threshold, the 'no signal continuous period number' is reduced by 1, if the updated 'no signal continuous period number' is less than 0, the 'no signal continuous period number' is limited to 0, the current state output result is 'signal', otherwise, the current state output result is 'no signal';
if the signal dispersion of the period is not greater than the signal dispersion high threshold, the number of the "no-signal continuous periods" is increased by 1, the current state output result is "no signal", and if the updated number of the "no-signal continuous periods" exceeds the maximum limit value of the no-signal continuous periods, the number of the "no-signal continuous periods" is limited to the maximum limit value.
The implementation principle is as follows: under the control of the main control unit, in each period, the high-speed signal acquisition unit carries out SAR ADC sampling on a high-speed signal, a section of continuous SAR ADC sampling point data is sent to the signal dispersion degree calculation unit, the average difference of the sampling point data is calculated to represent the signal dispersion degree of the high-speed signal, the signal dispersion degree is sent to the filtering and judgment unit, the signal dispersion degree is compared with the signal dispersion degree high threshold and the signal dispersion degree low threshold, and the calculation result of the previous period is combined to finally obtain the judgment result of whether the signal in the period exists or not.
The embodiment of the invention provides a system for continuously monitoring the existence of a high-speed signal, which achieves the aim of quickly judging the existence of the signal by adopting a mode of representing signal dispersion by calculating an average difference, reduces the time and space complexity of calculation by adopting an MCU (microprogrammed control Unit) or a corresponding circuit, reduces the resource requirements on the MCU and the corresponding circuit, and shortens the judgment time of the existence of the signal. By adopting the mode of carrying out hysteresis judgment and accumulation on the continuous periodicity of no signal, the jitter in the signal sampling data is filtered out, and the misjudgment rate of the existence of the signal is reduced.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A system for continuously monitoring the presence of high speed signals, comprising: the device comprises a main control unit, a high-speed signal acquisition unit, a signal dispersion degree calculation unit and a filtering and judgment unit;
the main control unit: controlling data sampling and derivation of a high-speed signal acquisition unit, and controlling numerical calculation of a signal dispersion calculation unit and a filtering and judging unit;
high-speed signal acquisition unit: the SAR ADC sampling circuit comprises a high-speed SAR ADC sampling circuit and a data derivation circuit, wherein the output end of the high-speed SAR ADC sampling circuit is connected with the input end of the data derivation circuit;
a signal dispersion calculation unit: connecting the output end of the data export circuit to obtain high-speed SAR ADC sampling point data, and calculating the mean value and the average difference of the high-speed SAR ADC sampling point data;
a filtering and judging unit: and judging whether the signal exists or not and accumulating the continuous cycle number of the signal without the signal according to the hysteresis threshold based on the average value and the average difference.
2. The system for continuously monitoring the existence of high-speed signals according to claim 1, wherein the main control unit, the signal dispersion calculation unit and the filtering and decision unit are all realized by software programming of an MCU (microprogrammed control Unit), or realized by a solidified digital circuit.
3. The system for continuously monitoring the existence of the high-speed signal according to claim 1, wherein the high-speed SAR ADC sampling in the high-speed signal acquisition unit comprises: and directly sampling the high-speed signal, or sampling a certain path of output signal obtained by carrying out frequency reduction on the high-speed signal.
4. The system according to claim 1, wherein the data derivation circuit in the high-speed signal acquisition unit needs to send a continuous section of high-speed SAR ADC sampling point data to the signal dispersion calculation unit and store the sampling point data in the cache, and the sampling point corresponding to the high-speed SAR ADC sampling point data needs to be capable of showing the overall amplitude characteristic of the signal.
5. The system for continuously monitoring the existence of a high-speed signal according to claim 1, wherein the signal dispersion calculation unit comprises:
calculating an arithmetic mean value of the obtained continuous high-speed SAR ADC sampling point data;
and calculating absolute values of deviations of all the high-speed SAR ADC sampling point data and the arithmetic mean, accumulating the absolute values of all the deviations, and calculating the mean value to obtain the mean difference for representing the signal dispersion.
6. The system for continuously monitoring the presence of high speed signals according to claim 1, wherein said filtering and decision unit: the hysteresis threshold comprises a signal dispersion high threshold and a signal dispersion low threshold, and both the thresholds can be configured;
accumulation of number of no-signal sustained cycles: to a no-signal duration period maximum limit value configurable;
the signal presence or absence decision result is the current state, and the signal dispersion degree of the previous state and the current period is required to be obtained.
7. The system for continuously monitoring the presence of high speed signals according to claim 6, wherein the filtering and decision logic of the filtering and decision unit is as follows:
when the previous state is a signal, if the signal dispersion of the period is smaller than the signal dispersion low threshold, the number of the non-signal continuous periods is increased by 1;
if the updated no-signal continuous period number exceeds the maximum limit value of the no-signal continuous period number, the no-signal continuous period number is limited to the maximum limit value, and the current state output result is no-signal, otherwise, the current state output result is signal.
8. The system of claim 7, wherein when the previous state is a signal, if the signal dispersion of the current period is not less than the signal dispersion low threshold, the number of the signal-free period is decreased by 1, and the current state output result is a signal;
if the number of the non-signal duration periods after the updating is less than 0, the number of the non-signal duration periods is limited to 0.
9. The system of claim 8, wherein when the previous state is no signal, if the signal dispersion of the present period is greater than the signal dispersion threshold, the number of the no-signal sustained periods is decreased by 1;
if the updated no-signal continuous periodicity is less than 0, the no-signal continuous periodicity is limited to 0, and the current state output result is a signal, otherwise the current state output result is no-signal.
10. The system of claim 9, wherein when the previous state is no signal, if the signal dispersion of the current period is not greater than the signal dispersion threshold, the number of the no-signal continuous periods is increased by 1, and the current state output result is no signal;
if the updated number of the no-signal duration periods exceeds the maximum limit value of the no-signal duration periods, the number of the no-signal duration periods is limited to the maximum limit value.
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