CN101795248A - Trapping wave forming method of originating broadband signal with variable parameters - Google Patents

Abstract

The invention relates to a trapping wave forming method of originating broadband signals with variable parameters, belonging to the technical field of communication signal treatment. The method comprises the following steps: at a signal transmission end, detecting the number n of useful narrow-band signals in real time and the bandwidth and frequency band distribution of each useful narrow-band signal, constructing n numbered sub-trappers corresponding to the useful narrow-band signals according to the bandwidth and frequency band distribution of the useful narrow-band signals at the transmission end, connecting the n numbered sub-trappers in serial to form a cascade trapper, trapping broadband transmission signals by the cascade trapper to obtain broadband signals with trapping wave corresponding to the frequencies of the useful narrow-band signals, continuously detecting the useful narrow-band signals, and updating the parameters of the trapper if parameters are found to be changed. The method is characterized in that when the narrow-band signal is detected in real time, parameters of a trapper are updated in real time according to detected results, thereby effectively inhabiting the interference of the broadband transmission signals on the narrow-band signal with variable parameters.

Description

A kind of trap manufacturing process of the broadband signal of making a start of variable element

Technical field

The invention belongs to the signal of communication processing technology field, particularly a kind of trap manufacturing process of the broadband signal of making a start of variable element.

Background technology

In present communication system, wide-band spread spectrum communication system and narrow-band communication system coexistence, because band resource is limited, sometimes at transmitting terminal, wideband spread-spectrum signal and the more shared frequency ranges of useful narrow band signal meeting, promptly the two frequency spectrum has taken place overlapping.If be sent out simultaneously at transmitting terminal wideband spread-spectrum signal and useful narrow band signal, also can mix on the frequency spectrum of narrow band signal has the part broadband signal, and narrow band signal just has been subjected to the interference of broadband signal like this.In actual scene, narrow-band communication system is time dependent in different operating frequency upper signal channel condition, and the bandwidth of the therefore number of useful narrow band signal, and each useful narrow band signal and frequency band these parameters that distribute are time dependent.Existing method can only be carried out trap at the useful narrow band signal of preset parameter and is shaped, and can't effectively suppress the interference of broadband emission signal to the narrow band signal generation of changeable parameters.

At present both at home and abroad at communication system suppress The Study of Interference more be how to suppress the influence of narrow-band interference signal for wideband received signal at receiving terminal.In these research work, considered that the narrow-band interference signal that receiving terminal will suppress is the signal of fixed frequency, as power frequency 50Hz interference signal, thereby the parameter of trapper of the receiving terminal of design fix, do not need real-time adjustment.And send in the scene of signal coexistence in transmitting terminal broadband signal and arrowband, narrow-band communication system is time dependent in different operating frequency upper signal channel condition, so number of useful narrow band signal, and the bandwidth of each useful narrow band signal and frequency band these parameters that distribute are time dependent, need the design effective method suppress the interference that the broadband emission signal produces the narrow band signal of changeable parameters.

Summary of the invention

The objective of the invention is when sending signal in transmitting terminal wideband sending signal and arrowband and exist simultaneously, wideband sending signal sends signal to the arrowband and produces the problem of disturbing, and has proposed a kind of trap manufacturing process of the broadband signal of making a start of variable element.The inventive method is flexible, convenient, and complexity is lower, is easy to realize.To the number n of narrow band signal, sub-trapper-these parameters of centre frequency ω of 3dB attenuation bandwidth B W and sub-trapper detect in real time, and according to testing result real-time update trap parameter, thereby effectively suppress of the interference of broadband emission signal to the narrow band signal generation of changeable parameters.

A kind of trap manufacturing process of the broadband signal of making a start of variable element is characterized in that, may further comprise the steps:

1) at signal sending end, detect the number n of current each useful narrow band signal, n is a positive integer, and the bandwidth BW of each useful narrow band signal ₁, BW ₂..., BW _nDistribute with frequency band;

2) be connected into a cascade trapper according to the bandwidth of each useful narrow band signal of transmitting terminal and frequency band distributed structure and the corresponding n of this useful narrow band signal sub-trapper, and with the individual sub-trapper of this n;

3) wideband sending signal is carried out trap by this cascade trapper, obtain having broadband signal with described each useful corresponding trap of narrow band signal frequency;

4) detect the number n of each useful narrow band signal in real time, and the bandwidth BW of each useful narrow band signal ₁, BW ₂..., BW _nDistribute with frequency band, change, forward step 2 to if find these parameters and the detected parameter of step 1)), otherwise, repeating step 4).

Described step 2) constructs and the corresponding n of each useful narrow band signal sub-trapper, and each n sub-trapper is connected into a cascade trapper, specifically comprise;

21) according to the bandwidth BW of each useful narrow band signal ₁, BW ₂..., BW _nDetermine each sub-trapper-3dB attenuation bandwidth [BW ₁BW ₂BW _n] ^T, it be one by BW ₁, BW ₂..., BW _nA vector that constitutes;

22) distribute according to the frequency band of each useful narrow band signal of transmitting terminal and determine the centre frequency [ω of each sub-trapper ₁ω ₂ω _n] ^T, the method for determining is: if the initial frequency of useful narrow band signal i is f _I1, the termination frequency is f _I2, the centre frequency of i sub-trapper then ${\mathrm{\ω}}_i=\frac{f_{i1}+f_{i2}}{2},$ i＝1，2…n；

23) determine the sample frequency f of trapper _s, f _sOperating frequency according to the transmitting terminal digital information processing system determines that its value is not higher than the maximum operating frequency of transmitting terminal digital information processing system;

24) calculate the normalization attenuation bandwidth and the centre frequency of each sub-trapper, normalized bandwidth is:

${[{\mathrm{BW}}_1^{\&prime;}{\mathrm{BW}}_2^{\&prime;}\&CenterDot;\&CenterDot;\&CenterDot;{\mathrm{BW}}_n^{\&prime;}]}^T=\frac{2\mathrm{\&pi;}*{[{\mathrm{BW}}_1{\mathrm{<figure-callout\; id="2"\; label="BW"\; filenames="H201010033671XE00031.png"\; state="\{\{state\}\}">BW</figure-callout>}}_2\&CenterDot;\&CenterDot;\&CenterDot;{\mathrm{BW}}_n]}^T}{f_s},$ Normalized centre frequency is:

${[{\mathrm{\&omega;}}_1^{\&prime;}{\mathrm{\&omega;}}_2^{\&prime;}\&CenterDot;\&CenterDot;\&CenterDot;{\mathrm{\&omega;}}_n^{\&prime;}]}^T=\frac{2\mathrm{\&pi;}*{[{\mathrm{\&omega;}}_1{\mathrm{\&omega;}}_2\&CenterDot;\&CenterDot;\&CenterDot;{\mathrm{\&omega;}}_n]}^T}{f_s};$

25) calculate the frequency parameter and the bandwidth parameter of each sub-trapper, frequency parameter is $\sin {\mathrm{\&theta;}}_{1i}=\sin ({\mathrm{\&omega;}}_i^{\&prime;}-\frac{\mathrm{\&pi;}}{2}),$ I=1 wherein, 2 ... n, bandwidth parameter is $\sin {\mathrm{\&theta;}}_{2i}=\frac{1-\tan ({\mathrm{BW}}_i^{\&prime;}/2)}{1+\tan ({\mathrm{BW}}_i^{\&prime;}/2)}=\tan (\frac{\mathrm{\&pi;}}{4}-\frac{{\mathrm{BW}}_i^{\&prime;}}{2}),$ I=1 wherein, 2 ... n;

26) according to step 25) frequency parameter and the bandwidth parameter of the sub-trapper that obtains construct each sub-trapper, obtains the transfer function of n sub-trapper, and the transfer function of i sub-trapper is:

$H_i\left(z\right)=\frac{1+\sin {\mathrm{\&theta;}}_{2i}}{2}\frac{1+2\sin {\mathrm{\&theta;}}_{1i}{z}^{-1}+z^{-2}}{1+\sin {\mathrm{\&theta;}}_{1i}(1+\sin {\mathrm{\&theta;}}_{2i})z^{-1}+\sin {\mathrm{\&theta;}}_{2i}{z}^{-2}}$

I=1 wherein, 2 ... n, z ^-1Expression is to sampling clock period T of digital signal sequences time-delay of input _s, $T_s=\frac{1}{f_s};$

27) with step 26) n of a gained trapper series connection obtains a cascade trapper, and the transfer function of cascade trapper is: H (z)=H ₁(z) * H ₂(z) * ... * H _n(z), go out digital cascade trapper according to the transfer function configures of cascade trapper then.

Characteristics of the present invention and effect:

In the inventive method, for the number n of sub-trapper, sub-trapper-3dB attenuation bandwidth BW _iAnd the centre frequency ω of sub-trapper _iBut flexible configuration (i=1 wherein, 2 all ... n).Therefore, when useful narrow band signal changes, number n that can the sub-trapper of real-time update, sub-trapper-3dB attenuation bandwidth BW _iAnd the centre frequency ω of sub-trapper _i, just can obtain new cascade trapper structure, thereby effectively suppress of the interference of broadband emission signal the narrow band signal generation of changeable parameters.The inventive method is flexible, convenient, and complexity is lower, is easy to realize.

The present invention can be used as and suppresses the method for broadband signal to the interference of the narrow band signal of changeable parameters in the Shortwave Communication System, also can be used as other communication system when transmitting terminal wideband spread-spectrum signal and the coexistence of useful narrow band signal and suppresses the method for broadband signal to the interference of the useful narrow band signal of changeable parameters.

Description of drawings

Fig. 1 is the flow chart of the generation method of trapper among the present invention;

Fig. 2 is the structural representation of the sub-trapper of the present invention's employing;

Fig. 3 is the structural representation of the cascade trapper of the present invention's employing;

Fig. 4 is the amplitude-frequency response of the cascade trapper in the embodiment of the invention.

Embodiment

Further describe method of the present invention below in conjunction with drawings and Examples.

The trap manufacturing process of the broadband signal of making a start of a kind of variable element of the present invention, its flow process is characterized in that as shown in Figure 1, may further comprise the steps:

1) at signal sending end, detect the number n of current each useful narrow band signal, n is a positive integer, and the bandwidth BW of each useful narrow band signal ₁, BW ₂..., BW _nWith frequency band distribution (described detection method is the known conventional technology in this area);

2) be connected into a cascade trapper according to the bandwidth of each useful narrow band signal of transmitting terminal and frequency band distributed structure and the corresponding n of each useful narrow band signal sub-trapper, and with each n sub-trapper;

3) wideband sending signal is carried out trap by this cascade trapper, obtain having broadband signal with described each useful corresponding trap of narrow band signal frequency;

4) detect the number n of each useful narrow band signal in real time, and the bandwidth BW of each useful narrow band signal ₁, BW ₂..., BW _nDistribute with frequency band, change, forward step 2 to if find these parameters and the detected parameter of step 1)), otherwise, repeating step 4).

Described step 2) constructs and the corresponding n of each useful narrow band signal sub-trapper, and each n sub-trapper is connected into a cascade trapper, specifically comprise;

21) according to the bandwidth BW of each useful narrow band signal ₁, BW ₂..., BW _nDetermine each sub-trapper-3dB attenuation bandwidth [BW ₁BW ₂BW _n] ^T, it be one by BW ₁, BW ₂..., BW _nA vector that constitutes;

22) distribute according to the frequency band of each useful narrow band signal of transmitting terminal and determine the centre frequency [ω of each sub-trapper ₁ω ₂ω _n] ^T, the method for determining is: if the initial frequency of arrowband i is f _I1, the termination frequency is f _I2, the centre frequency of i sub-trapper then ${\mathrm{\&omega;}}_i=\frac{f_{i1}+f_{i2}}{2},$ i＝1，2…n；

23) determine the sample frequency f of trapper _s, f _sOperating frequency according to the transmitting terminal digital information processing system determines that its value is not higher than the maximum operating frequency of transmitting terminal digital information processing system;

24) calculate the normalization attenuation bandwidth and the centre frequency of each sub-trapper, normalized bandwidth is

${[{\mathrm{BW}}_1^{\&prime;}{\mathrm{BW}}_2^{\&prime;}\&CenterDot;\&CenterDot;\&CenterDot;{\mathrm{BW}}_n^{\&prime;}]}^T=\frac{2\mathrm{\&pi;}*{[{\mathrm{BW}}_1{\mathrm{<figure-callout\; id="2"\; label="BW"\; filenames="H201010033671XE00031.png"\; state="\{\{state\}\}">BW</figure-callout>}}_2\&CenterDot;\&CenterDot;\&CenterDot;{\mathrm{BW}}_n]}^T}{f_s},$ Normalized centre frequency is

${[{\mathrm{\&omega;}}_1^{\&prime;}{\mathrm{\&omega;}}_2^{\&prime;}\&CenterDot;\&CenterDot;\&CenterDot;{\mathrm{\&omega;}}_n^{\&prime;}]}^T=\frac{2\mathrm{\&pi;}*{[{\mathrm{\&omega;}}_1{\mathrm{\&omega;}}_2\&CenterDot;\&CenterDot;\&CenterDot;{\mathrm{\&omega;}}_n]}^T}{f_s};$

25) calculate the frequency parameter and the bandwidth parameter of each sub-trapper, frequency parameter is $\sin {\mathrm{\&theta;}}_{1i}=\sin ({\mathrm{\&omega;}}_i^{\&prime;}-\frac{\mathrm{\&pi;}}{2}),$ I=1 wherein, 2 ... n, bandwidth parameter is $\sin {\mathrm{\&theta;}}_{2i}=\frac{1-\tan ({\mathrm{BW}}_i^{\&prime;}/2)}{1+\tan ({\mathrm{BW}}_i^{\&prime;}/2)}=\tan (\frac{\mathrm{\&pi;}}{4}-\frac{{\mathrm{BW}}_i^{\&prime;}}{2}),$ I=1 wherein, 2 ... n;

26) according to step 25) frequency parameter and the bandwidth parameter of the sub-trapper that obtains construct each sub-trapper, obtains the transfer function of n sub-trapper, and the transfer function of i sub-trapper is:

$H_i\left(z\right)=\frac{1+\sin {\mathrm{\&theta;}}_{2i}}{2}\frac{1+2\sin {\mathrm{\&theta;}}_{1i}{z}^{-1}+z^{-2}}{1+\sin {\mathrm{\&theta;}}_{1i}(1+\sin {\mathrm{\&theta;}}_{2i})z^{-1}+\sin {\mathrm{\&theta;}}_{2i}{z}^{-2}}$

I=1 wherein, 2 ... n, z ^-1Expression is to sampling clock period T of digital signal sequences time-delay of input _s, $T_s=\frac{1}{f_s};$

27) with step 26) n of a gained trapper series connection obtains a cascade trapper, and the transfer function of cascade trapper is: H (z)=H ₁(z) * H ₂(z) * ... * H _n(z), then according to the digital cascade trapper of the transfer function configures of cascade trapper.

Embodiment 1:

The method of present embodiment may further comprise the steps:

1) at signal sending end, adopt spectrum analyzer to detect make a start number n=3 of useful narrow band signal of current time, the bandwidth of useful narrow band signal 1 is BW ₁=2kHz, frequency band is distributed as 0.349-0.351MHz, and the bandwidth of useful narrow band signal 2 is BW ₁=3kHz, frequency band is distributed as 0.3985-0.4015MHz, and the bandwidth of useful narrow band signal 3 is BW ₁=3.5kHz, frequency band distribution 0.69825-0.70175MHz;

2) be connected into a cascade trapper according to the bandwidth of each useful narrow band signal of transmitting terminal and frequency band distributed structure and the corresponding n of each useful narrow band signal sub-trapper, and with each n sub-trapper;

Described step 2) constructs and the corresponding n of each useful narrow band signal sub-trapper, and each n sub-trapper is connected into a cascade trapper, specifically comprise;

21) according to the bandwidth of each useful narrow band signal determine each sub-trapper-3dB attenuation bandwidth [BW ₁BW ₂BW _n] ^T, it be one by BW ₁, BW ₂..., BW _nA vector that constitutes, [BW ₁BW ₂BW ₃] ^T=[200030003500] ^THz;

22) distribute according to the frequency band of each useful narrow band signal of transmitting terminal and determine the centre frequency [ω of each sub-trapper ₁ω ₂ω _n] ^T, the method for determining is: if the initial frequency of arrowband i is f _I1, the termination frequency is f _I2, the centre frequency of i sub-trapper then ${\mathrm{\&omega;}}_i=\frac{f_{i1}+f_{i2}}{2},$ I=1,2 ... n can obtain by calculating:

${\left[{\mathrm{\&omega;}}_1{\mathrm{\&omega;}}_2{\mathrm{\&omega;}}_3\right]}^T={\left[\frac{0.349+0.351}{2}\frac{0.3985+0.4015}{2}\frac{0.69825+0.70175}{2}\right]}^T*{10}^6;$

$={\left[\mathrm{0.350.40.7}\right]}^T*{10}^6\mathrm{Hz}$

23) determine the sample frequency f of trapper _s, f _sOperating frequency according to the transmitting terminal digital information processing system determines that its value is not higher than the maximum operating frequency of transmitting terminal digital information processing system, determines f _s=2*10 ⁶Hz;

24) calculate the normalization attenuation bandwidth and the centre frequency of each sub-trapper, normalized bandwidth is

${\left[{\mathrm{BW}}_1^{\&prime;}{\mathrm{<figure-callout\; id="2"\; label="BW"\; filenames="H201010033671XE00031.png"\; state="\{\{state\}\}">BW</figure-callout>}}_2^{\&prime;}{\mathrm{BW}}_3^{\&prime;}\right]}^T=\frac{2\mathrm{\&pi;}*{\left[{\mathrm{BW}}_1{\mathrm{<figure-callout\; id="2"\; label="BW"\; filenames="H201010033671XE00031.png"\; state="\{\{state\}\}">BW</figure-callout>}}_2{\mathrm{BW}}_3\right]}^T}{f_s}$

$=\frac{2\mathrm{\&pi;}*{\left[200030003500\right]}^{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="H201010033671XE00031.png"\; state="\{\{state\}\}">T</figure-callout>}}}{2*{10}^6},$

$={\left[\mathrm{0.00630.00940.0110}\right]}^T$

Normalized centre frequency is

${\left[{\mathrm{\&omega;}}_1^{\&prime;}{\mathrm{\&omega;}}_2^{\&prime;}{\mathrm{\&omega;}}_3^{\&prime;}\right]}^T=\frac{2\mathrm{\&pi;}*{\left[{\mathrm{\&omega;}}_1{\mathrm{\&omega;}}_2{\mathrm{\&omega;}}_3\right]}^T}{f_s}$

$=\frac{2\mathrm{\&pi;}*{\left[\mathrm{0.350.40.7}\right]}^T*{10}^6}{2*{10}^6};$

$={\left[\mathrm{1.00961.25662.1991}\right]}^T$

25) calculate the frequency parameter and the bandwidth parameter of each sub-trapper, frequency parameter is $\sin {\mathrm{\&theta;}}_{1i}=\sin ({\mathrm{\&omega;}}_i^{\&prime;}-\frac{\mathrm{\&pi;}}{2}),$ I=1 wherein, 2 ... n, bandwidth parameter is $\sin {\mathrm{\&theta;}}_{2i}=\frac{1-\tan ({\mathrm{BW}}_i^{\&prime;}/2)}{1+\tan ({\mathrm{BW}}_i^{\&prime;}/2)}=\tan (\frac{\mathrm{\&pi;}}{4}-\frac{{\mathrm{BW}}_i^{\&prime;}}{2}),$ I=1 wherein, 2 ... n,

The frequency parameter and the bandwidth parameter of sub-trapper 1 are respectively $\sin {\mathrm{\&theta;}}_{11}=\sin ({\mathrm{\&omega;}}_1^{\&prime;}-\frac{\mathrm{\&pi;}}{2})=\sin (1.0096-\frac{\mathrm{\&pi;}}{2})=-0.4540,$

$\sin {\mathrm{\&theta;}}_{21}=\tan (\frac{\mathrm{\&pi;}}{4}-\frac{{\mathrm{BW}}_1^{\&prime;}}{2})=\tan (\frac{\mathrm{\&pi;}}{4}-\frac{0.0063}{2})=0.9937;$

The frequency parameter and the bandwidth parameter of sub-trapper 2 are respectively

$\sin {\mathrm{\&theta;}}_{12}=\sin ({\mathrm{\&omega;}}_2^{\&prime;}-\frac{\mathrm{\&pi;}}{2})=\sin (1.2566-\frac{\mathrm{\&pi;}}{2})=-0.3090,$

${\sin \mathrm{\&theta;}}_{22}=\tan (\frac{\mathrm{\&pi;}}{4}-\frac{{\mathrm{<figure-callout\; id="2"\; label="BW"\; filenames="H201010033671XE00031.png"\; state="\{\{state\}\}">BW</figure-callout>}}_2^{\&prime;}}{2})=\tan (\frac{\mathrm{\&pi;}}{4}-\frac{0.0094}{2})=0.9906;$

The frequency parameter and the bandwidth parameter of sub-trapper 3 are respectively

${\sin \mathrm{\&theta;}}_{13}=\sin ({\mathrm{\&omega;}}_3^{\&prime;}-\frac{\mathrm{\&pi;}}{2})=\sin (2.1991-\frac{\mathrm{\&pi;}}{2})=0.5878,$

${\sin \mathrm{\&theta;}}_{23}=\tan (\frac{\mathrm{\&pi;}}{4}-\frac{{\mathrm{BW}}_3^{\&prime;}}{2})=\tan (\frac{\mathrm{\&pi;}}{4}-\frac{0.0110}{2})=0.9891;$

26) according to step 25) frequency parameter and the bandwidth parameter of the sub-trapper that obtains construct each sub-trapper, obtains the transfer function of 3 sub-trappers, and the transfer function of each sub-trapper is respectively:

$H_1\left(z\right)=\frac{1+\sin {\mathrm{\&theta;}}_{21}}{2}\frac{1+{2\sin \mathrm{\&theta;}}_{11}{z}^{-1}+z^{-2}}{1+\sin {\mathrm{\&theta;}}_{11}(1+\sin {\mathrm{\&theta;}}_{21})z^{-1}+\sin {\mathrm{\&theta;}}_{21}{z}^{-2}}$

$=\frac{1+0.9937}{2}\frac{1-2*0.4540*z^{-1}+z^{-2}}{1-0.4540*(1+0.9937)z^{-1}+0.9937z^{-2}}$

$=\frac{0.9969-0.9051z^{-1}+0.9969z^{-2}}{1-0.9051z^{-1}+{0.9937z}^{-2}}$

$H_2\left(z\right)=\frac{1+\sin {\mathrm{\&theta;}}_{22}}{2}\frac{1+{2\sin \mathrm{\&theta;}}_{12}{z}^{-1}+z^{-2}}{1+\sin {\mathrm{\&theta;}}_{12}(1+\sin {\mathrm{\&theta;}}_{22})z^{-1}+\sin {\mathrm{\&theta;}}_{22}{z}^{-2}}$

$=\frac{0.9953-0.6151z^{-1}+0.9953z^{-2}}{1-{0.6151z}^{-1}+{0.9906z}^{-2}}$

$H_3\left(z\right)=\frac{1+\sin {\mathrm{\&theta;}}_{23}}{2}\frac{1+{2\sin \mathrm{\&theta;}}_{13}{z}^{-1}+z^{-2}}{1+\sin {\mathrm{\&theta;}}_{13}(1+\sin {\mathrm{\&theta;}}_{23})z^{-1}+\sin {\mathrm{\&theta;}}_{23}{z}^{-2}};$

$=\frac{0.9945+1.1691z^{-1}+0.9945z^{-2}}{1+1.1691z^{-1}+0.9891z^{-2}}$

27) with step 26) n of a gained trapper series connection obtains a cascade trapper, and the transfer function of cascade trapper is:

$H\left(z\right)=H_1\left(z\right)*H_2\left(z\right)*H_3\left(z\right)$

$=\frac{0.9969-0.9051z^{-1}+0.9969z^{-2}}{1-0.9051z^{-1}+0.9937z^{-2}}*\frac{0.9953-0.6151z^{-1}+0.9953z^{-2}}{1-0.6151z^{-1}+0.9906z^{-2}}*\frac{0.9945+1.1691z^{-1}+0.9945z^{-2}}{1+1.691z^{-1}+0.9891z^{-2}}$

Then according to the digital cascade trapper of the transfer function configures of cascade trapper.

3) wideband sending signal is carried out trap by this cascade trapper, obtain having broadband signal with described each useful corresponding trap of narrow band signal frequency;

4) the employing spectrum analyzer detects the number n of each useful narrow band signal in real time, and the bandwidth BW of each useful narrow band signal ₁, BW ₂..., BW _nDistribute with frequency band, change, forward step 2 to if find these parameters and the detected parameter of step 1)), otherwise, repeating step 4).

It is the digital notch method that has adopted in the digital filtering theory that the present invention adopts cascade trapper structure.Each sub-trapper can be restrained a narrow-band interference signal.The structure of sub-trapper is wherein used the trend of the wire list registration word burst of band arrow, sin θ as shown in Figure 2 ₁The frequency parameter that is called as sub-trapper, sin θ ₂The bandwidth parameter that is called as sub-trapper,

Be digital adder,

Under to wear a minus sign be digital subtractor, The expression digital multiplier, the multiple of multiplier be marked on multiplier directly over,

The expression d type flip flop, it can be to digital signal sequences sampling clock cycle of time-delay of input $T_s=\frac{1}{f_s},$ F wherein _sBe sample frequency.The input and output signal burst of digital adder, subtracter, multiplier and d type flip flop is represented by the direction of arrow.According to the relevant knowledge of the structure and the Digital Signal Processing of sub-trapper shown in Figure 2, the transfer function that can obtain sub-trapper is:

$H\left(z\right)=\frac{1+\sin {\mathrm{\&theta;}}_2}{2}\frac{1+{2\sin \mathrm{\&theta;}}_1{z}^{-1}+z^{-2}}{1+\sin {\mathrm{\&theta;}}_1(1+\sin {\mathrm{\&theta;}}_2)z^{-1}+\sin {\mathrm{\&theta;}}_2{z}^{-2}}$

Z wherein ^-1Expression is to sampling clock period T of digital signal sequences time-delay of input _sConversely, according to the transfer function H (z) of sub-trapper, also can design the structure of sub-trapper according to structure chart shown in Figure 2.The cascade trapper is together in series a plurality of sub-trappers exactly, if the transfer function of i sub-trapper is H _i(z), the transfer function of cascade trapper is exactly H (z)=H ₁(z) * H ₂(z) * ... * H _n(z).The structure of cascade trapper as shown in Figure 3.Make z=e among the H (z) ^Jw', w ' is the frequency independent variable of digital signal, H (e so ^Jw') be the frequency response of trapper, A (w ')=| H (e ^Jw') | be the amplitude-frequency response of trapper.

The amplitude-frequency response A (w ') of the cascade trapper of present embodiment=| H (e ^Jw') | as shown in Figure 4, this trapper sample frequency is f _s=2MHz, trap number n=3, trap centre frequency and notch bandwidth are respectively:

ω ₁＝0.35MHz，BW ₁＝2kHz；ω ₂＝0.4MHz，BW ₁＝3kHz；ω ₃＝0.7MHz，BW ₃＝3.5kHz。This cascade trapper is at digital signal frequency w as can see from Figure 4 ₁' 0.35 π, w ₂' 0.4 π, w ₃Three frequencies of '=0.7 π have produced three traps, and these several frequency corresponding simulating signal frequencies are $w_1=\frac{{w_1}^{\&prime;}{f}_s}{2\mathrm{\&pi;}}=0.35\mathrm{MHz},$ ${\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="H201010033671XE00031.png"\; state="\{\{state\}\}">w</figure-callout>}}_2=\frac{{{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="H201010033671XE00031.png"\; state="\{\{state\}\}">w</figure-callout>}}_2}^{\&prime;}{f}_s}{2\mathrm{\&pi;}}=0.4\mathrm{MHz},$ $w_3=\frac{{w_3}^{\&prime;}{f}_s}{2\mathrm{\&pi;}}=0.7\mathrm{MHz},$ Just be the centre frequency of useful narrow band signal.Further analysis can be found the also lucky bandwidth corresponding to corresponding useful narrow band signal of each trap-3dB attenuation bandwidth.

The trap manufacturing process of the broadband signal of making a start of a kind of variable element proposed by the invention as can be seen from the above-described embodiment, flexibly, conveniently, and complexity is lower, is easy to realize.When spectrum analyzer detect the number n of narrow band signal, sub-trapper-when these parameters of centre frequency ω of 3dB attenuation bandwidth BW and sub-trapper change, can re-construct the cascade trapper according to new measurement result, thereby effectively suppress of the interference of broadband emission signal the narrow band signal generation of changeable parameters.

The foregoing description just is used to specify the trap shaping Algorithm of the configurable broadband signal of making a start of the present invention; concrete data wherein just for convenience of description and arbitrarily are provided with; can not be in order to limit protection scope of the present invention; promptly as long as implement by the described step of this claim, wherein any variation of data all should belong to protection category of the present invention.

Claims (1)

1. the trap manufacturing process of the broadband signal of making a start of a variable element is characterized in that, may further comprise the steps:

1) at signal sending end, detect the number n of current each useful narrow band signal, n is a positive integer, and the bandwidth BW of each useful narrow band signal ₁, BW ₂..., BW _nDistribute with frequency band;

2) be connected into a cascade trapper according to the bandwidth of each useful narrow band signal of transmitting terminal and frequency band distributed structure and the corresponding n of this useful narrow band signal sub-trapper, and with the individual sub-trapper of this n;

3) wideband sending signal is carried out trap by this cascade trapper, obtain having broadband signal with described each useful corresponding trap of narrow band signal frequency;

4) detect the number n of each useful narrow band signal in real time, and the bandwidth BW of each useful narrow band signal ₁, BW ₂..., BW _nDistribute with frequency band, change, forward step 2 to if find these parameters and the detected parameter of step 1)), otherwise, repeating step 4).

Described step 2) constructs and the corresponding n of each useful narrow band signal sub-trapper, and each n sub-trapper is connected into a cascade trapper, specifically comprise;

21) according to the bandwidth BW of each useful narrow band signal ₁, BW ₂..., BW _nDetermine each sub-trapper-3dB attenuation bandwidth [BW ₁BW ₂BW _n] ^T, it be one by BW ₁, BW ₂..., BW _nA vector that constitutes;

22) distribute according to the frequency band of each useful narrow band signal of transmitting terminal and determine the centre frequency [ω of each sub-trapper ₁ω ₂ω _n] ^T, the method for determining is: if the initial frequency of useful narrow band signal i is f _I1, the termination frequency is f _I2, the centre frequency of i sub-trapper then ${\mathrm{\&omega;}}_i=\frac{f_{i1}+f_{i2}}{2},i=\mathrm{1,2}...n;$

23) determine the sample frequency f of trapper _s, f _sOperating frequency according to the transmitting terminal digital information processing system determines that its value is not higher than the maximum operating frequency of transmitting terminal digital information processing system;

24) calculate the normalization attenuation bandwidth and the centre frequency of each sub-trapper, normalized bandwidth is:

Normalized centre frequency is:

${[{\mathrm{\&omega;}}_1^{\&prime;}{\mathrm{\&omega;}}_2^{\&prime;}...{\mathrm{\&omega;}}_n^{\&prime;}]}^T=\frac{2\mathrm{\&pi;}*{[{\mathrm{\&omega;}}_1{\mathrm{\&omega;}}_2...{\mathrm{\&omega;}}_n]}^T}{f_s};$

25) calculate the frequency parameter and the bandwidth parameter of each sub-trapper, frequency parameter is

I=1 wherein, 2 ... n, bandwidth parameter is I=1 wherein, 2 ... n;

26) according to step 25) frequency parameter and the bandwidth parameter of the sub-trapper that obtains construct each sub-trapper, obtains the transfer function of n sub-trapper, and the transfer function of i sub-trapper is:

$H_i\left(z\right)=\frac{1+{\sin \mathrm{\&theta;}}_{2i}}{2}\frac{1+2\sin {\mathrm{\&theta;}}_{1i}{z}^{-1}+z^{-2}}{1+\sin {\mathrm{\&theta;}}_{1i}(1+{\sin \mathrm{\&theta;}}_{2i})z^{-1}+\sin {\mathrm{\&theta;}}_{2i}+z^{-2}}$

I=1 wherein, 2 ... n, z ^-1Expression is to sampling clock period T of digital signal sequences time-delay of input _s,

27) with step 26) n of a gained trapper series connection obtains a cascade trapper, and the transfer function of cascade trapper is: H (z)=H ₁(z) * H ₂(z) * ... * H _n(z), go out digital cascade trapper according to the transfer function configures of cascade trapper then.

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