CN113866516B - Signal source amplitude adjustment method and device based on noise floor area judgment - Google Patents
Signal source amplitude adjustment method and device based on noise floor area judgment Download PDFInfo
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- CN113866516B CN113866516B CN202111161247.8A CN202111161247A CN113866516B CN 113866516 B CN113866516 B CN 113866516B CN 202111161247 A CN202111161247 A CN 202111161247A CN 113866516 B CN113866516 B CN 113866516B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
Abstract
The invention discloses a signal source amplitude adjustment method and a signal source amplitude adjustment device based on noise floor area judgment, wherein the method comprises the steps of S1, setting initial parameters of a signal source; s2, starting signal source amplitude adjustment of the current frequency point, and setting an initial cycle count value i to be 1; s3, setting the amplitude of the signal source to be SiAnd turning on the output of the signal source; s4, judging whether the output of the signal source is lower than the minimum output of the signal source or not, and S5, sending a signal generated by the signal source into an electric field radiation antenna after the signal is amplified by an amplifier, wherein the generated radiation interference signal interferes with a tested product; the controller adjusts the output of the signal source according to the interference electric field intensity value and the limit value; s6, repeating the steps S4-S5 until the signal source amplitude adjustment requirement of the current frequency point is met, and adjusting the next frequency point. The invention can avoid the problem that the noise floor of the output signal of the power amplifier is too high, so that the very small signal source output can reach the requirement of exceeding the limit value, and the signal source is automatically adjusted to be invalid.
Description
Technical Field
The invention relates to signal source amplitude automatic control, in particular to a signal source amplitude adjusting method and device based on noise floor area judgment.
Background
The electromagnetic compatibility test includes two major parts, electromagnetic interference (EMI) measurement and electromagnetic susceptibility (EMS) measurement. The electromagnetic radiation sensitivity measurement method is suitable for equipment and subsystem shells and all interconnection cables, and is used for checking the capability of EUT and related cables to bear radiation electric fields.
The traditional electromagnetic radiation sensitivity test does not consider whether the power amplifier enters a noise floor area, so that the amplitude adjustment of a signal source does not change the amplitude of an output signal of the power amplifier, the amplitude adjustment of the signal source fails, and the requirement of a specified limit value cannot be met. In the existing scheme, whether a power amplifier enters a noise floor area is judged by adopting a mode that the gain compression ratio of the power amplifier is lower than 0.8, the requirement on the gain compression property of the power amplifier is strict, and after the frequency is increased to a certain degree, the gain compression property does not have good stable characteristic along with the change of the amplitude, so that the situation that the monitored amplitude is continuously adjusted back and forth near the limit value occurs, and the amplitude adjustment time of a single frequency point is prolonged; meanwhile, for a practical power amplifier, when the frequency is increased to a certain degree, the gain compression is not stable any more, and under the condition of the jitter of the gain compression, the output of the power amplifier falls into the region, the output of the power amplifier is often misjudged to reach a noise floor region of the power amplifier, wherein the noise floor is called as a false noise floor, so that the amplitude of a signal source is not adjusted in place; it also causes a wide frequency range to be treated as "noise floor" (entering the saturation region of the power amplifier is also treated as "noise floor"), resulting in the automatic adjustment of the amplitude of the signal source in the whole frequency range being ineffective.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a signal source amplitude adjusting method and device based on noise floor area judgment, which can avoid the problem that the signal source automatic adjustment fails because the noise floor of a power amplifier output signal is too high, so that the very small signal source output reaches the requirement of exceeding the limit value.
The purpose of the invention is realized by the following technical scheme: a signal source amplitude adjusting method based on noise floor area judgment comprises the following steps:
s1, setting the signal source output amplitude S with the lowest signal source0The corresponding limit E to be reached by the current frequency point0A signal source adjustment coefficient alpha, a limit value threshold value x and a noise floor threshold value Y;
s2, starting signal source amplitude adjustment of the current frequency point, and setting an initial cycle count value i to be 1;
s3, setting the amplitude of the signal source to be SiAnd turning on the output of the signal source;
s4, judging whether the signal source output is lower than the minimum output of the signal source, namely Si＜S0:
If yes, entering a power amplifier or a system noise floor area, finishing the signal source amplitude adjustment of the current frequency, recording the current amplitude and entering the next frequency point;
if not, the power amplifier or the system noise floor is not entered and the step S4 is executed;
s5, signals generated by the signal source are amplified by an amplifier and then are sent to an electric field radiation antenna, and the generated radiation interference signals interfere the tested object; the electric field sensor monitors the intensity of the interference electric field of the tested object and returns the interference electric field to the field intensity meter, and the controller adjusts the output of the signal source according to the intensity value of the interference electric field output by the field intensity meter and the limit value;
s6, returning to the step S4, and repeatedly executing the steps S4-S5 until the signal source amplitude adjustment requirement of the current frequency point is met, and then adjusting the next frequency point.
Further, the process of adjusting the signal source output according to the interference electric field strength value and the limit value in step S5 is as follows:
s501, the electric field sensor monitors the intensity of interference electric field of the tested object and returns the interference electric field to the field intensity meter, and the controller obtains a radiation electric field E on the tested object from the field intensity meteriThe difference between the test field strength and the corresponding limit to be reached is calculated as: deltai＝E0-Ei；
S502, judging the difference value deltaiWhether i > 1 and
if yes, entering a power amplifier or a system noise floor area, finishing the signal source amplitude adjustment of the current frequency, recording the current amplitude and entering the next frequency point adjustment;
if not, the power amplifier or the system noise floor area is not entered and the step S503 is executed;
s503, judging the difference value deltaiWhether or not | Δ is satisfiedi|＜X：
If so, controlling the amplitude adjustment of the signal source to ensure that the output of the power amplifier meets the requirement of the limit value and the amplitude adjustment of the signal source of the current frequency is ended;
if not, executing step S504;
s504, updating output S of the signal sourcei+1＝Si+α·Δi(ii) a The number of cycles is increased by 1, i.e.: i ═ i + 1.
Further, the signal source amplitude adjustment requirement meeting the current frequency point in step S6 meets: | Δi|＜X、
Or Si＜S0Any one of the conditions in (1).
Further, after entering the next frequency point adjustment, the processing of steps S1-S5 is repeated for the next frequency point until the signal source amplitude adjustment is completed after all frequency points of the signal source are adjusted.
A signal source amplitude adjusting device based on noise floor area judgment comprises a signal source, an amplifier, an electric field radiation antenna, an electric field sensor, a field intensity meter and a controller;
the signal source is used for generating a test signal, and the generated signal is amplified by the amplifier and then sent to the excitation input end of the electric field radiation antenna;
the electric field radiation antenna is used for generating radiation interference signals to interfere the tested object;
the electric field sensor is used for monitoring the intensity of the interference electric field of the tested object and returning the interference electric field to the field intensity meter;
and the controller adjusts the output of the signal source according to the interference electric field strength value and the limit value output by the field intensity meter.
The invention has the beneficial effects that: 1. the amplitude adjustment at the current frequency point can be finished when the power amplifier noise floor or the system noise floor area is entered, the amplitude adjustment process of the signal source is accelerated, the test time is saved, and the test efficiency is improved;
2. the test time is saved, so that the service life of hardware equipment such as a power amplifier, an antenna and the like is prolonged, and the equipment maintenance cost is reduced;
3. for a general power amplifier with unstable gain compression, a signal source can be ensured to be adjusted to a required output.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
fig. 2 is a schematic block diagram of the apparatus of the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1, a signal source amplitude adjustment method based on noise floor area determination includes the following steps:
s1, setting the signal source output amplitude S with the lowest signal source0The corresponding limit E to be reached by the current frequency point0A signal source adjustment coefficient alpha, a limit value threshold value X and a noise floor threshold value Y;
s2, starting signal source amplitude adjustment of the current frequency point, and setting an initial cycle count value i to be 1;
s3, setting the amplitude of the signal source to be SiAnd turning on the output of the signal source;
s4, judging whether the signal source output is lower than the minimum output of the signal source, namely Si＜S0:
If yes, entering a power amplifier or a system noise floor area, finishing the signal source amplitude adjustment of the current frequency, recording the current amplitude and entering the next frequency point;
if not, the power amplifier or the system noise floor is not entered and the step S4 is executed;
s5, signals generated by the signal source are amplified by an amplifier and then are sent to an electric field radiation antenna, and the generated radiation interference signals interfere the tested object; the electric field sensor monitors the intensity of the interference electric field of the tested object and returns the interference electric field to the field intensity meter, and the controller adjusts the output of the signal source according to the intensity value of the interference electric field output by the field intensity meter and the limit value;
s6, returning to the step S4, and repeatedly executing the steps S4-S5 until the signal source amplitude adjustment requirement of the current frequency point is met, and then adjusting the next frequency point.
Further, the process of adjusting the signal source output according to the interference electric field strength value and the limit value in step S5 is as follows:
s501, the electric field sensor monitors the intensity of the interference electric field of the tested object and returns the interference electric field to the field intensity meter, and the controllerObtaining the radiation electric field E on the tested object from the field intensity meteriThe difference between the test field strength and the corresponding limit to be reached is calculated as: deltai＝E0-Ei；
S502, judging the difference value deltaiWhether i > 1 and
if yes, entering a power amplifier or a system noise floor area, finishing the signal source amplitude adjustment of the current frequency, recording the current amplitude and entering the next frequency point adjustment;
if not, the power amplifier or the system noise floor area is not entered and the step S503 is executed;
s503, judging the difference value deltaiWhether or not | Δ is satisfiedi|＜X：
If so, controlling the amplitude adjustment of the signal source to ensure that the output of the power amplifier meets the requirement of the limit value and the amplitude adjustment of the signal source of the current frequency is ended;
if not, executing step S504;
s504, updating output S of the signal sourcei+1＝Si+α·Δi(ii) a The number of cycles is increased by 1, i.e.: i ═ i + 1.
Further, the signal source amplitude adjustment requirement meeting the current frequency point in step S6 meets: | Δi|＜X、
Or Si＜S0Any one of the conditions in (1).
Further, after entering the next frequency point adjustment, the processing of steps S1-S5 is repeated for the next frequency point until the signal source amplitude adjustment is completed after all frequency points of the signal source are adjusted.
As shown in fig. 2, a signal source amplitude adjusting apparatus based on noise floor area determination includes a signal source, an amplifier, an electric field radiation antenna, an electric field sensor, a field intensity meter, and a controller;
the signal source is used for generating a test signal, and the generated signal is amplified by the amplifier and then sent to the excitation input end of the electric field radiation antenna;
the electric field radiation antenna is used for generating radiation interference signals to interfere the tested object;
the electric field sensor is used for monitoring the intensity of the interference electric field of the tested object and returning the interference electric field to the field intensity meter;
and the controller adjusts the output of the signal source according to the interference electric field strength value and the limit value output by the field intensity meter.
In a first embodiment of the application, for a certain adjustment, the limit values are chosen as: when adjusted to 2.6GHz, the limit value is 50V/m, and the conversion is E decibels0154dB mu V/m, the signal source adjusting coefficient alpha is 0.9, the threshold value X is 0.3, the noise floor threshold value Y is 0.93, and the minimum amplitude S of the signal source0Specific adjustments are shown in table 1 as-40 dBm:
table 1 process of amplitude adjustment according to the present invention
It can be seen from table 1 that the second step (i ═ 2) is due to
The prior art scheme judges that the power amplifier enters a nonlinear noise floor area and ends the signal source amplitude adjustment of the current frequency in advance. The improved current noise floor area judgment method can enable the electric field monitored by the field monitor to reach the limit value requirement of 50V/m specified by the limit value when the amplitude of the signal source is adjusted in the fourth step;
therefore, if the prior art scheme is adopted, the signal source amplitude is taken as entering a noise floor area of the power amplifier when being adjusted to the second step, and the signal source amplitude adjustment of the current frequency is ended in advance, so that the signal source amplitude cannot be adjusted to the electric field strength required by the limit value; the electromagnetic compatibility radiation sensitivity test has thousands of frequency points, and the frequency point test according to the prior art can take a plurality of continuous frequency points as entering a noise floor area.
In a second embodiment of the application, for another adjustment, the limit values are chosen as: is suitable for army ground, and when the frequency is regulated to 963MHz, the limit value is 10V/m, and the conversion is E decibel0140dB mu V/m, the signal source adjusting coefficient alpha is 0.9, the threshold value X is 0.3, the noise floor threshold value Y is 0.93, and the minimum amplitude S of the signal source0Specific adjustments are shown in table 2 as-40 dBm:
table 2 process of amplitude adjustment according to the present invention
The method of the patent is adopted when the third step is adjusted
And judging that the signal source enters a noise floor area of the power amplifier and exits from the signal source amplitude adjustment of the current frequency point.
Therefore, the technical scheme of the invention is used for judging whether the power amplifier enters the noise floor area accurately.
In conclusion, the invention solves the problem that the signal source is automatically adjusted and disabled because the noise floor of the output signal of the power amplifier is too high, so that the very small signal source output can meet the requirement of exceeding the limit value of the electromagnetic compatibility sensitivity test; automatically judging when the power amplifier or the system noise floor is added; the problem of false noise floor caused by unbalanced gain compression of the power amplifier is solved; because the amplitude adjustment at the current frequency point can be finished when the power amplifier noise floor or the system noise floor area is entered, the amplitude adjustment process of the signal source is accelerated, the test time is saved, and the test efficiency is improved; the test time is saved, so that the service life of hardware equipment such as a power amplifier, an antenna and the like is prolonged, and the equipment maintenance cost is reduced.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A signal source amplitude adjusting method based on noise floor area judgment is characterized in that: the method comprises the following steps:
s1, setting the lowest signal source output amplitude S0The corresponding limit E to be reached by the current frequency point0A signal source adjustment coefficient alpha, a limit value threshold value X and a noise floor threshold value Y;
s2, starting signal source output amplitude adjustment of a current frequency point, and setting an initial cycle count value i to be 1;
s3, setting the output amplitude of the signal source to be SiAnd turning on the output of the signal source;
s4, judging whether the output amplitude of the signal source is lower than the lowest signal source output amplitude, namely Si＜S0：
If yes, entering a power amplifier or a system noise floor area, finishing the adjustment of the output amplitude of the signal source with the current frequency, recording the output amplitude of the current signal source and entering the next frequency point;
if not, the power amplifier or system noise floor area is not entered and step S5 is executed;
s5, signals generated by the signal source are amplified by the power amplifier and then are sent to the electric field radiation antenna, and the generated radiation interference signals interfere the tested object; the electric field sensor monitors the intensity of the interference electric field of the tested object and returns the interference electric field to the field intensity meter, and the controller adjusts the output amplitude of the signal source according to the intensity value and the limit value of the interference electric field output by the field intensity meter;
in step S5, the process of adjusting the output amplitude of the signal source according to the interference electric field strength value and the limit value is as follows:
s501, the electric field sensor monitors the intensity of interference electric field of the tested object and returns the interference electric field to the field intensity meter, and the controller is driven by the field intensity meterObtaining the test field intensity E of the tested objectiCalculating the test field intensity EiCorresponding limit E to be reached0The difference between them is: deltai＝E0-Ei；
S502, judging the difference value deltaiWhether i > 1 and
if the current signal source output amplitude meets the preset frequency point, entering a power amplifier or a system noise bottom area, finishing the adjustment of the signal source output amplitude of the current frequency, recording the current signal source output amplitude and entering the next frequency point adjustment;
if not, the power amplifier or the system noise floor area is not entered and the step S503 is executed;
s503, judging the difference value deltaiWhether or not | Δ is satisfiedi|＜X：
If so, controlling the output amplitude adjustment of the signal source to ensure that the output of the power amplifier meets the requirement of the limit value and finishing the output amplitude adjustment of the signal source with the current frequency;
if not, executing step S504;
s504, updating the output amplitude S of the signal sourcei+1＝Si+α·Δi(ii) a The number of cycles is increased by 1, i.e.: i is i + 1;
s6, returning to the step S4, and repeatedly executing the steps S4-S5 until the signal source output amplitude adjustment requirement of the current frequency point is met, and then adjusting the next frequency point.
2. The signal source amplitude adjustment method based on noise floor area judgment according to claim 1, characterized in that: the signal source output amplitude adjustment requirement meeting the current frequency point in step S6 meets: | Δi|＜X、
Or Si＜S0Any one of the conditions (1) above.
3. The signal source amplitude adjustment method based on noise floor area judgment according to claim 1, characterized in that: and after the next frequency point is adjusted, repeating the processing of the steps S1-S5 for the next frequency point until all the frequency points of the signal source are adjusted, and finishing the adjustment of the output amplitude of the signal source.
4. A signal source amplitude adjusting device based on noise floor area judgment, which adopts the method of any one of claims 1-3 when adjusting the signal source amplitude, and is characterized in that: the device comprises a signal source, a power amplifier, an electric field radiation antenna, an electric field sensor, a field intensity meter and a controller;
the signal source is used for generating a test signal, and the generated signal is amplified by the power amplifier and then sent to the excitation input end of the electric field radiation antenna;
the electric field radiation antenna is used for generating radiation interference signals to interfere the tested object;
the electric field sensor is used for monitoring the intensity of the interference electric field of the tested object and returning the interference electric field to the field intensity meter;
and the controller adjusts the output amplitude of the signal source according to the interference electric field strength value and the limit value output by the field intensity meter.
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