Gain automatic control method suitable for burst signal

Abstract

The invention discloses an automatic gain control method suitable for a burst signal. The method comprises the following steps: S1, pre-judging a noise signal; s2, calculating a power gain deviation value; s3, calculating and judging a noise power value; s4, calculating signal power level saturability; s5, calculating an automatic gain control value; and S6, realizing automatic gain control of the burst signal in a circulation step. Through the automatic gain control method suitable for the burst signal, the confusion of noise level, signal waveform distortion and other conventional automatic gain control algorithms is avoided, and under the conditions that the burst signal characteristics are not weakened and the signal quality is improved, the signal detection capture rate is improved, the omission factor is reduced, and the recognition accuracy is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of burst signals, and in particular to an automatic gain control method suitable for burst signals. Background Art

[0002] Burst signals refer to short continuous wave signals, pulse signals, etc. transmitted over the air, with the shortest duration being less than 1 millisecond. Conventional automatic gain control times are more than tens of milliseconds, or even hundreds of milliseconds, which will result in long gain response time and unsatisfactory signal gain control, thus affecting the signal demodulation effect. The use of fixed gain control time and automatic gain control parameters will cause inappropriate gain control parameters due to changes in signal amplitude, resulting in large signal waveform saturation distortion, synchronous amplification of noise signals, and loss of burst signal characteristics, which will lead to serious missed detection and signal loss.

[0003] Signal gain control is divided into two methods: RF link gain control and baseband IQ signal gain control, both of which have the above problems. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an automatic gain control method suitable for burst signals.

[0005] A gain automatic control method applicable to burst signals comprises the following steps:

[0006] S1: predict noise signal;

[0007] S2: Calculate the power gain deviation value;

[0008] S3: Calculate and determine the noise power value;

[0009] S4: Calculate signal power level saturation;

[0010] S5: Calculate automatic gain control value;

[0011] S6: The loop step realizes automatic gain control of the burst signal.

[0012] Furthermore, a gain automatic control method applicable to a burst signal, the step S1 comprises the following sub-steps:

[0013] S11: Start automatic gain control, set the control power level PC0 and response time T0;

[0014] S12: Perform spectrum scanning on the signal with the set frequency range Fs-t and instantaneous bandwidth BW, record the spectrum power P1 of the first bandwidth, scan and record the power P2 of the next bandwidth, ..., the spectrum power Pn of the Nth bandwidth;

[0015] Wherein, the number of scans N = Fs-t / BW;

[0016] S13: Calculate the maximum value of power, Pmax=max{P1, P2, ..., Pn}, and calculate the minimum value of power Pmin=min{P1, P2, ..., Pn};

[0017] S14: Noise power level No = Pmin + the last bandwidth single scan bandwidth BW calculates and records the maximum power level Pmax and the noise power level ΔP within the scan range;

[0018] The default value of ΔP is 5.

[0019] Further, a gain automatic control method applicable to a burst signal, the step S2 comprises the following sub-steps:

[0020] S21: Select a scanning bandwidth DW, start collecting spectrum at time interval T0, and record the current signal power level PP1;

[0021] S22: Calculate the current power level deviation value according to the current signal power level PP1, the formula is:

[0022] ΔPP1=PC0-PP1;

[0023] Wherein, ΔPP1 represents the current power level deviation value.

[0024] Further, a gain automatic control method applicable to burst signals, said step S3 comprises the following sub-steps:

[0025] S3: Analyze the signal spectrum. If the current power level PP1 < the noise power level No, the current signal is judged to be noise. If it is noise, calculate the power deviation value. The formula is:

[0026] ΔP11=ΔPP1 / N;

[0027] Wherein, N=1, 2, 3, 4, the default value is 4, and ΔP11 represents the power deviation value.

[0028] Further, a gain automatic control method applicable to burst signals, said S4 comprises the following sub-steps:

[0029] S41: Adjust the power level according to the power deviation value. The formula is:

[0030] P11=PP1+ΔP11;

[0031] Wherein, P11 represents the adjusted power level;

[0032] S42: Determine whether the adjusted power level meets the maximum power level Pmax range:

[0033] If P11≤Pmax, then ΔPG1=PC0-Pmax;

[0034] If P11>PADmax, then ΔPG1=PADmax-PP1;

[0035] Among them, PADmax represents the maximum saturation level of spectrum acquisition, which is determined by the saturation value of hardware ADC acquisition, and ΔPG1 represents the power difference that needs to be adjusted, in dB.

[0036] Further, a gain automatic control method applicable to a burst signal, said S5 comprises the following sub-steps:

[0037] S51: The adjusted power value to be controlled PS1=PP1+ΔPG1, assuming that the gain control value corresponding to the current signal power PP1 is G1, the gain step interval is 1dB, and the gain control value deviation corresponding to the power difference ΔPG1 is ΔG1, then the value-added value corresponding to the signal power PS1 is G11, and the formula is:

[0038] G11=G1+ΔG1;

[0039] Wherein, ΔG1 represents the gain control value corresponding to the power deviation value ΔPG1.

[0040] Further, a gain automatic control method applicable to a burst signal, said S6 comprises the following sub-steps:

[0041] S61: repeat steps S2-S5 at every T0 time interval, 1, 2, ..., N time intervals T0, to obtain a series of current signal power levels PP2, PP3, PP4, ..., PPN;

[0042] S62: Obtain a series of gain control values ​​G11i according to the collected signal power level, and adaptively implement automatic gain control of the burst signal;

[0043] Wherein, i=1, 2, 3, ..., n, and n represents the number of time intervals T0.

[0044] The beneficial effects of the present invention are: a gain automatic control method suitable for burst signals, which solves the difficult problems of signal detection accuracy and demodulation quality by analyzing the characteristics of burst signal waveforms and noise signals, prejudging the noise and signals in the automatic gain control algorithm, and combining signal saturation detection and judgment and other processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a flow chart of the method of the present invention.

[0046] Figure 2 It is a schematic diagram of the paragraph division of S6 of the present invention. DETAILED DESCRIPTION

[0047] The present invention is further described below, but the protection scope of the present invention is not limited to the following description.

[0048] As attached Figure 1 As shown, a gain automatic control method applicable to burst signals comprises the following steps:

[0049] S1: predict noise signal;

[0050] S2: Calculate the power gain deviation value;

[0051] S3: Calculate and determine the noise power value;

[0052] S4: Calculate signal power level saturation;

[0053] S5: Calculate automatic gain control value;

[0054] S6: The loop step realizes automatic gain control of the burst signal.

[0055] Furthermore, a gain automatic control method applicable to a burst signal, the step S1 comprises the following sub-steps:

[0056] S11: Start automatic gain control, set the control power level PC0 and response time T0;

[0057] S12: Perform spectrum scanning on the signal with the set frequency range Fs-t and instantaneous bandwidth BW, record the spectrum power P1 of the first bandwidth, scan and record the power P2 of the next bandwidth, ..., the spectrum power Pn of the Nth bandwidth;

[0058] Wherein, the number of scans N = Fs-t / BW;

[0059] S13: Calculate the maximum value of power, Pmax=max{P1, P2, ..., Pn}, and calculate the minimum value of power Pmin=min{P1, P2, ..., Pn};

[0060] S14: Noise power level No = Pmin + the last bandwidth single scan bandwidth BW calculates and records the maximum power level Pmax and the noise power level ΔP within the scan range;

[0061] The default value of ΔP is 5.

[0062] Further, a gain automatic control method applicable to a burst signal, the step S2 comprises the following sub-steps:

[0063] S21: Select a scanning bandwidth DW, start collecting spectrum at time interval T0, and record the current signal power level PP1;

[0064] S22: Calculate the current power level deviation value according to the current signal power level PP1, the formula is:

[0065] ΔPP1=PC0-PP1;

[0066] Wherein, ΔPP1 represents the current power level deviation value.

[0067] Further, a gain automatic control method applicable to burst signals, said step S3 comprises the following sub-steps:

[0068] S3: Analyze the signal spectrum. If the current power level PP1 < the noise power level No, the current signal is judged to be noise. If it is noise, calculate the power deviation value. The formula is:

[0069] ΔP11=ΔPP1 / N;

[0070] Wherein, N=1, 2, 3, 4, the default value is 4, and ΔP11 represents the power deviation value.

[0071] Further, a gain automatic control method applicable to burst signals, said S4 comprises the following sub-steps:

[0072] S41: Adjust the power level according to the power deviation value. The formula is:

[0073] P11=PP1+ΔP11;

[0074] Wherein, P11 represents the adjusted power level;

[0075] S42: Determine whether the adjusted power level meets the maximum power level Pmax range:

[0076] If P11≤Pmax, then ΔPG1=PC0-Pmax;

[0077] If P11>PADmax, then ΔPG1=PADmax-PP1;

[0078] Among them, PADmax represents the maximum saturation level of spectrum acquisition, which is determined by the saturation value of hardware ADC acquisition, and ΔPG1 represents the power difference that needs to be adjusted, in dB.

[0079] Further, a gain automatic control method applicable to a burst signal, said S5 comprises the following sub-steps:

[0080] S51: The adjusted power value to be controlled PS1=PP1+ΔPG1, assuming that the gain control value corresponding to the current signal power PP1 is G1, the gain step interval is 1dB, and the gain control value deviation corresponding to the power difference ΔPG1 is ΔG1, then the value-added value corresponding to the signal power PS1 is G11, and the formula is:

[0081] G11=G1+ΔG1;

[0082] Wherein, ΔG1 represents the gain control value corresponding to the power deviation value ΔPG1.

[0083] As attached Figure 2 As shown, a gain automatic control method applicable to burst signals, said S6 comprises the following sub-steps:

[0084] S61: repeat steps S2-S5 at every T0 time interval, 1, 2, ..., N time intervals T0, to obtain a series of current signal power levels PP2, PP3, PP4, ..., PPN;

[0085] S62: Obtain a series of gain control values ​​G11i according to the collected signal power level, and adaptively implement automatic gain control of the burst signal;

[0086] Wherein, i=1, 2, 3, ..., n, and n represents the number of time intervals T0.

[0087] This scheme avoids the confusion of conventional automatic gain control algorithms such as noise level and signal waveform distortion through an automatic gain control method suitable for burst signals. It improves the signal detection capture rate, reduces the missed detection rate, and greatly improves the recognition accuracy without weakening the characteristics of the burst signal and improving the signal quality.

[0088] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A gain automatic control method suitable for burst signals, characterized in that: The following steps are involved: S1: predict noise signal; S2: Calculate the power gain deviation value; S3: Calculate and determine the noise power value; S4: Calculate signal power level saturation; S5: Calculate automatic gain control value; S6: The loop step realizes automatic gain control of the burst signal.

2. The automatic gain control method for burst signals according to claim 1, characterized in that: The step S1 comprises the following sub-steps: S11: Start automatic gain control, set the control power level PC0 and response time T0; S12: Perform spectrum scanning on the signal with the set frequency range Fs-t and instantaneous bandwidth BW, record the spectrum power P1 of the first bandwidth, scan and record the power P2 of the next bandwidth, ..., the spectrum power Pn of the Nth bandwidth; Wherein, the number of scans N = Fs-t / BW; S13: Calculate the maximum value of power, Pmax=max{P1, P2, ..., Pn}, and calculate the minimum value of power Pmin=min{P1, P2, ..., Pn}; S14: Noise power level No = Pmin + the last bandwidth single scan bandwidth BW, record the maximum power level Pmax and the noise power level ΔP within the scan range; The default value of ΔP is 5.

3. The automatic gain control method for burst signals according to claim 1, characterized in that: The step S2 comprises the following sub-steps: S21: Select a scanning bandwidth DW, start collecting spectrum at time interval T0, and record the current signal power level PP1; S22: Calculate the current power level deviation value according to the current signal power level. The formula is: ΔPP1=PC0-PP1; Wherein, ΔPP1 represents the current power level deviation value.

4. The automatic gain control method for burst signals according to claim 1, characterized in that: The step S3 comprises the following sub-steps: S3: Analyze the signal spectrum. If the current power level PP1 < the noise power level No, the current signal is judged to be noise. If it is noise, calculate the power deviation value. The formula is: ΔP11=ΔPP1 / N; Wherein, N=1, 2, 3, 4, the default value is 4, and ΔP11 represents the power deviation value.

5. The automatic gain control method applicable to burst signals according to claim 1, characterized in that: The S4 comprises the following sub-steps: S41: Adjust the power level according to the power deviation value. The formula is: P11=PP1+ΔP11; Wherein, P11 represents the adjusted power level; S42: Determine whether the adjusted power level meets the maximum power level Pmax range: If P11≤Pmax, then ΔPG1=PC0-Pmax; If P11>PADmax, then ΔPG1=PADmax-PP1; Among them, PADmax represents the maximum saturation level of spectrum acquisition, which is determined by the saturation value of hardware ADC acquisition, and ΔPG1 represents the power difference that needs to be adjusted, in dB.

6. The automatic gain control method applicable to burst signals according to claim 1, characterized in that: The S5 comprises the following sub-steps: S51: The adjusted power value to be controlled PS1=PP1+ΔPG1, assuming that the gain control value corresponding to the current signal power PP1 is G1, the gain step interval is 1dB, and the gain control value deviation corresponding to the power difference ΔPG1 is ΔG1, then the value-added value corresponding to the signal power PS1 is G11, and the formula is: G11=G1+ΔG1; Wherein, ΔG1 represents the gain control value corresponding to the power deviation value ΔPG1.

7. The automatic gain control method applicable to burst signals according to claim 1, characterized in that: The S6 comprises the following sub-steps: S61: repeat steps S2-S5 at every T0 time interval, 1, 2, ..., N time intervals T0, to obtain a series of current signal power levels PP2, PP3, PP4, ..., PPN; S62: Obtain a series of gain control values ​​G11i according to the collected signal power level, and adaptively implement automatic gain control of the burst signal; Wherein, i=1, 2, 3, ..., n, and n represents the number of time intervals T0.

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