阅读说明：本技术 宽带带通滤波器系统及方法 (Wideband bandpass filter system and method ) 是由 潘文桥 于 2020-05-20 设计创作，主要内容包括：本发明属于通信技术领域,具体为宽带带通滤波器系统及方法,所述系统包括：采样单元,用于采集原始信号；带通滤波单元,用于提取信号的基波信号；零相位滤波单元,用于接收第一带通滤波单元的输出信号,并对其进行二次滤波；第一控制单元,用于对基波滤波单元的幅频特性曲线进行拟合,得到幅值增益与频率的关系,进行幅值补偿。在采集到原始信号后,对原始信号进行预处理,预处理后的信号在进行带通滤波时,其基波信号更容易被提取,再对提取的基波信号进行信号幅值补偿,使得最终经过带通的信号准确率更高,同时进行带通滤波的效率更高。(The invention belongs to the technical field of communication, in particular to a broadband band-pass filter system and a method, wherein the system comprises: the sampling unit is used for acquiring an original signal; the band-pass filtering unit is used for extracting a fundamental wave signal of the signal; the zero phase filtering unit is used for receiving the output signal of the first band-pass filtering unit and carrying out secondary filtering on the output signal; and the first control unit is used for fitting the amplitude-frequency characteristic curve of the fundamental wave filtering unit to obtain the relation between the amplitude gain and the frequency and perform amplitude compensation. After gathering original signal, carry out the preliminary treatment to original signal, the signal after the preliminary treatment is when carrying out band-pass filtering, and its fundamental wave signal is drawed more easily, carries out signal amplitude compensation to the fundamental wave signal of drawing again for the signal accuracy rate through the band-pass finally is higher, and the efficiency of carrying out band-pass filtering simultaneously is higher.)

1. A wideband bandpass filter system, the system comprising: the sampling unit is used for acquiring an original signal; the band-pass filtering unit is used for extracting a fundamental wave signal of the signal; the zero phase filtering unit is used for receiving the output signal of the first band-pass filtering unit and carrying out secondary filtering on the output signal; the first control unit is used for fitting an amplitude-frequency characteristic curve of the fundamental wave filtering unit to obtain the relation between amplitude gain and frequency and carrying out amplitude compensation; characterized in that the system further comprises: a signal preprocessing unit; the signal preprocessing unit is arranged between the sampling unit and the band-pass filtering unit; the signal preprocessing unit preprocesses the original signal to obtain a preprocessed signal, and sends the preprocessed signal to the band-pass filtering unit; the signal preprocessing unit carries out differential frequency modulation on the original signal, wherein the differential frequency modulation refers to that a differential sequence is directly used as a modulation signal to be modulated on a carrier wave to form a frequency modulation signal; wherein the frequency modulated signal is: signal (T) ═ Acos (sin ω 0T + cosB ═ c (T) dt), 0 ≦ T; wherein the modulation signal c (t) is: acos (ω 0t + B |) dt; wherein T is the time length of s (T), ω 0 is the center frequency, B is the modulation index, x_nThe length of the difference sequence is N, the frequency modulation time occupied by each code element in the difference sequence is T0 ═ T/N, and u (T) is a step function; r (t) is a ramp function, which is the integral of u (t).

2. The system of claim 1, wherein the differential sequence is: s_n+1＝cos(sinωarccos(S_n))，-1＜S_nLess than 1, when the parameter value S is taken_nTo 0.65, a first seed S is given₀Generating a difference sequence as 5; on the basis, according to the formula: s (T) ═ Acos (sin ω 0T + cosB ═ c (T) dt), where T is greater than or equal to 0 and less than or equal to T, generates a differential frequency modulation signal, where parameters T, ω 0, B, and N can be adjusted according to the actual communication rate, bit error rate, and communication distance, and take the values: the signal time length T is between 2.0s and 10.0s, the central frequency omega 0 is less than 1000Hz, the signal bandwidth B is between 60Hz and 290Hz, and the length N of the differential sequence is between 75 and 4100.

3. The system of claim 2, wherein the system further comprises: the low-order harmonic band-pass filtering unit is used for extracting 2-5-order harmonics in the preprocessed signals; the second control unit is used for fitting an amplitude-frequency characteristic curve of the low-order harmonic band-pass filtering unit to obtain the relation between amplitude gain and frequency and carrying out amplitude compensation; and the Chebyshev II type filtering unit is used for extracting 6-order and above-order harmonics in the preprocessed signal.

4. The system of claim 3, wherein the second control unit is consistent with the first control unit in structure, or directly uses the first control unit, and the control parameters need to be modified according to specific requirements; the system further comprises: a zero phase filtering unit; the zero-phase filtering unit comprises a field programmable gate array and a control unit, wherein the field programmable gate array stores measured signals into a section of buffer area and transmits the signals to the control unit, the preprocessed signals are subjected to one-time continuous filtering, and the latest points are selected and stored into the buffer area for inversion.

5. The system of claim 2, wherein the first seed is stepped by Δ -4 to produce a series of seeds, thereby generating a series of differential chirp signals; the cross correlation of the differential frequency modulation signals is solved, M differential frequency modulation signals with the cross correlation value of every two being less than 0.15 are preferably selected, and a signal set is formed; and M is 512-4096, and the number r of the combined signals needs to be determined due to the adoption of a signal combination parallel transmission mode, wherein the value of r is 1-10.

6. A method of wideband band-pass filtering based on the wideband band-pass filter system of one of claims 1 to 5, the method performing the steps of: the sampling unit is used for collecting original signals; a band-pass filtering unit for extracting a fundamental wave signal of the signal; the zero phase filtering unit receives the output signal of the first band-pass filtering unit and carries out secondary filtering on the output signal; the first control unit is used for fitting an amplitude-frequency characteristic curve of the fundamental wave filtering unit to obtain the relation between amplitude gain and frequency and carrying out amplitude compensation; characterized in that the method further performs the steps of: a signal preprocessing unit is arranged between the sampling unit and the band-pass filtering unit; the signal preprocessing unit preprocesses the original signal to obtain a preprocessed signal, and sends the preprocessed signal to the band-pass filtering unit; the signal preprocessing unit carries out differential frequency modulation on the original signal, wherein the differential frequency modulation refers to that a differential sequence is directly used as a modulation signal to be modulated on a carrier wave to form a frequency modulation signal; wherein the frequency modulated signal is: signal (T) ═ Acos (sin ω 0T + cosB ═ c (T) dt), 0 ≦ T; wherein the modulation signal c (t) is: acos (ω 0t + B |) dt; wherein T is the time length of s (T), ω 0 is the center frequency, B is the modulation index, x_nThe length of the difference sequence is N, the frequency modulation time occupied by each code element in the difference sequence is T0 ═ T/N, and u (T) is a step function; r (t) is a ramp function, which is the integral of u (t).

7. The method of claim 6, wherein the differential sequence is: s_n+1＝cos(sinωarccos(Sn))，-1＜S_nLess than 1, when the parameter value S is taken_nTo 0.65, a first seed S is given₀Generating a difference sequence as 5; on the basis, according to the formula: s (T) ═ Acos (sin ω 0T + cosB ═ c (T) dt), where T is greater than or equal to 0 and less than or equal to T, generates a differential frequency modulation signal, where parameters T, ω 0, B, and N can be adjusted according to the actual communication rate, bit error rate, and communication distance, and take the values: the signal time length T is2.0 s-10.0 s, the central frequency omega 0 is less than 1000Hz, the signal bandwidth B is between 60 Hz-290 Hz, and the length N of the differential sequence is between 75-4100.

8. The method of claim 7, wherein the method further comprises: sequentially setting low-order harmonic band-pass filtering units, and extracting 2-5-order harmonics in the preprocessed signals; the second control unit is used for fitting an amplitude-frequency characteristic curve of the low-order harmonic band-pass filtering unit to obtain the relation between amplitude gain and frequency and carrying out amplitude compensation; and the Chebyshev II type filtering unit extracts 6-order and above-order harmonics in the preprocessed signal.

9. The method of claim 3, wherein the second control unit is consistent with the first control unit in structure, or the first control unit is directly used, and the control parameters need to be modified according to specific requirements; the method further comprises the following steps: setting a zero phase filtering unit; the zero-phase filtering unit comprises a field programmable gate array and a control unit, wherein the field programmable gate array stores measured signals into a section of buffer area and transmits the signals to the control unit, the preprocessed signals are subjected to one-time continuous filtering, and the latest points are selected and stored into the buffer area for inversion.

10. The method of claim 2, wherein the first seed is stepped by Δ ═ 4 to produce a series of seeds, thereby producing a series of differential chirp signals; the cross correlation of the differential frequency modulation signals is solved, M differential frequency modulation signals with the cross correlation value of every two being less than 0.15 are preferably selected, and a signal set is formed; and M is 512-4096, and the number r of the combined signals needs to be determined due to the adoption of a signal combination parallel transmission mode, wherein the value of r is 1-10.