CN103916143A - Non-equal-altitude step wave signal processing method and device for very-low-frequency long-wave transmitter - Google Patents
Non-equal-altitude step wave signal processing method and device for very-low-frequency long-wave transmitter Download PDFInfo
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Abstract
The invention relates to a non-equal-altitude step wave signal processing method and device for a very-low-frequency long-wave transmitter. The non-equal-altitude step wave signal processing method for the very-low-frequency long-wave transmitter comprises the steps that sampling, analog-digital conversion and quantization processing are conducted on analog input signals of the transmitter, and a quantization value of a digital input signal is obtained; the quantization value of the digital input signal is compared with a step altitude value in a non-equal-altitude step altitude table, and the step altitude value, closest to the quantization value of the digital input signal, in the non-equal-altitude step altitude table is determined to be the step altitude value of the digital input signal; a control signal of a corresponding power amplifier unit is generated according to the step altitude value of the digital input signal; in all the difference values of all the step altitude values between two adjacent steps in the non-equal-altitude step altitude table, at least two difference values are different from the other difference values. By the adoption of the non-equal-altitude step wave signal processing method and device for the very-low-frequency long-wave transmitter, the waveform of the output signal of the transmitter can be made to be similar to sine waves to the maximum extent, harmonic waves of the transmitter are made to tend to the optimal state, the degree of distortion of the signal is lowered effectively, and the performance indexes of the transmitter are increased.
Description
Technical field
The present invention relates to very low frequency long-wave transmitter technology, particularly relate to the non-contour step signal processing method of a kind of very low frequency long-wave transmitter and device.
Background technology
Very low frequency long-wave transmitter is launched after being mainly used in the sine wave signal of input to amplify by its inner power amplifier unit, and the waveform of the signal of launching to approach sine wave better.
" core component " of very low frequency long-wave transmitter is staircase waveform modulator.Staircase waveform modulator is arranged between signal source and high-power amplification unit, its role is to, and by each power amplifier unit in transmitter is controlled, makes transmitter by the sine wave signal that carries complex information distortionless as far as possible " expressing " of input.The quality of staircase waveform modulator self performance can directly have influence on transmitter overall performance index.
At present, existing staircase waveform modulator is all the staircase waveform modulator of the simulation of building based on separating component conventionally, and all adopt contour step signal treatment technology, thereby the each ladder in the staircase waveform of existing very low frequency long-wave transmitter output signal is contour (quantification that is each step is highly identical), and the number of the power amplifier unit of opening on each ladder is identical.A concrete example, all power amplifier units in transmitter (as 120 power amplifier units) are equally divided into 12 groups, every group of power amplifier unit (as 10 power amplifier units) opened simultaneously or turn-offs, the staircase waveform of transmitter output signal is 12 staircase waveforms, and the positive half cycle of transmitter output signal or the maximum step number of negative half period are 12; Thereby the staircase waveform of transmitter output signal as shown in Figure 1.
Inventor finds realizing in process of the present invention: the contour staircase waveform in Fig. 1 and sine wave are contrasted and can obviously be found out, the reality " shape " of contour staircase waveform more approaches triangular wave, and more approaching sine wave not.This is mainly because actual sinusoidal wave waveform is not identical at different its slopes of phase place place, and existing staircase waveform modulator has carried out " contour " to the sine wave of transmitter input signal and processes and to cause; Finally can cause transmitter complete machine harmonic wave to increase, distorted signals is more serious, and transmitter overall performance index has been produced to harmful effect.
Because the problem that existing very low frequency long-wave transmitter exists, practical experience and the professional knowledge of the inventor based on being engaged in this type of product design manufacture and enriching for many years, and the utilization of cooperation scientific principle, actively research and innovation in addition, to founding the non-contour step signal processing method of a kind of very low frequency long-wave transmitter and device, can overcome the problem that existing very low frequency long-wave transmitter exists, make it have more practicality.Through continuous research and design, and through repeatedly studying sample and improvement, finally create the present invention who has practical value.
Summary of the invention
Main purpose of the present invention is, overcome the technical problem that existing very low frequency long-wave transmitter exists, and provide the non-contour step signal processing method of a kind of very low frequency long-wave transmitter and device, technical problem to be solved is, make the waveform of very low frequency long-wave transmitter output signal approach as much as possible sinusoidal wave, thereby make the harmonic wave of transmitter be tending towards optimum state, and effectively reduce signal distortion, improve transmitter performance index.
Object of the present invention and solve its technical problem and can adopt following technical scheme to realize.
The non-contour step signal processing method of a kind of very low frequency long-wave transmitter proposing according to the present invention, comprise the steps: the analog input signal of very low frequency long-wave transmitter to sample, and the analog input signal that sampling is obtained is converted to digital input signals; Described digital input signals is carried out to quantification treatment, to obtain the quantized value of digital input signals; Ladder height value in the quantized value of described digital input signals and predefined non-contour ladder height table is compared, to determine in described non-contour ladder height table and the immediate ladder height value of quantized value of described digital input signals, and described immediate ladder height value is defined as to the ladder height value of described digital input signals; Produce the control signal of corresponding power amplifier unit in very low frequency long-wave transmitter according to the ladder height value of described digital input signals, and export described control signal to described corresponding power amplifier unit; Wherein, in the difference of the ladder height value of two all adjacent ladders in described non-contour ladder height table, have at least two differences not identical.
Preferably, aforesaid method, wherein saidly carries out quantification treatment to described digital input signals and comprises: the quantity of the power amplifier unit in described very low frequency long-wave transmitter is carried out to quantification treatment as maximum true amplitude and the minimal negative amplitude of quantification treatment to described digital input signals respectively.
Preferably, aforesaid method, wherein the set-up mode of this non-contour ladder height table comprises: optional frequency desirable complete sine wave is sampled, and sampled result is quantized, to obtain this sinusoidal wave true value quantization table; According to the true value quantization table of described sine wave, described non-contour ladder height table is set; Wherein, described sampled result is quantized to comprise: the quantity of the power amplifier unit in described very low frequency long-wave transmitter is quantized described sampled result as maximum true amplitude and the minimal negative amplitude of quantification treatment respectively.
Preferably, aforesaid method, the wherein said sampled point quantity that optional frequency desirable complete sine wave is sampled for: after the product of the positive half cycle of a complete staircase waveform or the ladder quantity that negative half period comprises and 4, with 2 sums.
Preferably, aforesaid method, wherein, in a complete described staircase waveform, has at least the quantity of two corresponding power amplifier units of ladder not identical.
The non-contour step signal processing unit of a kind of very low frequency long-wave transmitter proposing according to the present invention, comprise following module: sampling module, for the analog input signal of very low frequency long-wave transmitter is sampled, and the analog input signal that this sampling is obtained is converted to digital input signals; Quantization modules, for described digital input signals is carried out to quantification treatment, to obtain the quantized value of digital input signals; Control module, for the ladder height value of the quantized value of described digital input signals and predefined non-contour ladder height table is compared, to determine in described non-contour ladder height table and the immediate ladder height value of quantized value of described digital input signals, and described immediate ladder height value is defined as to the ladder height value of described digital input signals; Executive Module, for produce the control signal of the corresponding power amplifier unit of very low frequency long-wave transmitter according to the ladder height value of described digital input signals, and exports described control signal to described corresponding power amplifier unit; Wherein, in the difference of the ladder height value of two all adjacent ladders in described non-contour ladder height table, have at least two differences not identical.
Preferably, aforesaid device, wherein said device is the digital staircase waveform modulator in described transmitter, is arranged between signal source and each power amplifier unit.
Preferably, aforesaid device, wherein said quantization modules is carried out quantification treatment as maximum true amplitude and the minimal negative amplitude of quantification treatment to described digital input signals respectively using the quantity of the power amplifier unit in described very low frequency long-wave transmitter.
Preferably, aforesaid device, wherein said sampling module is realized by analog to digital converter, and described quantization modules and control module are realized by digital signal processor DSP, and described Executive Module is realized by on-site programmable gate array FPGA.
Preferably, aforesaid device, wherein said non-contour ladder height table arranges according to following manner: described DSP samples to optional frequency desirable complete sine wave, and sampled result is quantized, to obtain this sinusoidal wave true value quantization table; Described DSP arranges described non-contour ladder height table according to the true value quantization table of described sine wave; Wherein, described sampled result is quantized to comprise: described DSP quantizes as maximum true amplitude and the minimal negative amplitude of quantification treatment the quantity of the power amplifier unit in described very low frequency long-wave transmitter respectively to described sampled result.
By technique scheme, the non-contour step signal processing method of very low frequency long-wave transmitter of the present invention and device at least have following advantages and a beneficial effect: the present invention by the analog input signal to transmitter sample, analog-to-digital conversion and quantification treatment, and the ladder height value in the quantized value of acquisition and non-contour ladder height table is compared, can determine the ladder height value of each digital input signals; Because the ladder height value in non-contour ladder height table of the present invention arranges based on not contour principle, therefore, the ladder height value of the each ladder in non-contour ladder height table can arrange in different not identical this features of its slope of phase place place according to sinusoidal wave waveform completely, stepped ladder height be there are differences, and also can be not quite similar for the quantity of the corresponding power amplifier unit of each ladder; Like this, by the ladder height value according to digital input signals, each power amplifier unit is controlled accordingly, can be made the waveform of transmitter output signal approach as much as possible sinusoidal wave; Thereby technical scheme provided by the invention can make the harmonic wave of transmitter be tending towards optimum state, and can effectively avoid the distortion phenomenon of transmitter output signal, and then improve the overall performance index of transmitter.
In sum, the present invention has significant progress technically, and has significantly positive technique effect, is really a new and innovative, progressive, practical new design.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of specification, and for above and other object of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and coordinate Figure of description, be described in detail as follows.
Brief description of the drawings
Fig. 1 is the contour staircase waveform of prior art and sinusoidal wave contrast schematic diagram;
Fig. 2 is the flow chart of the non-contour step signal processing method of very low frequency long-wave transmitter of the present invention;
Fig. 3 of the present inventionly carries out described point one by one by quantized value, and each described point is connected to the curve obtaining with level and smooth curve;
Fig. 4 is the part ladder schematic diagram of sample quantization value of the present invention and non-contour staircase waveform;
Fig. 5 is the non-contour staircase waveform of transmitter output of the present invention and sinusoidal wave contrast schematic diagram;
Fig. 6 a is the sinusoidal wave schematic diagram obtaining based on sample quantization value of the present invention;
Fig. 6 b is the schematic diagram of non-contour staircase waveform of the present invention;
Fig. 7 is the structural representation of the non-contour step signal processing unit of very low frequency long-wave transmitter of the present invention.
Embodiment
Technological means and effect of taking for reaching predetermined goal of the invention for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to the non-contour step signal processing method of very low frequency long-wave transmitter proposing according to the present invention and embodiment, flow process, structure, feature and effect thereof of device, be described in detail as follows.
Embodiment mono-, the non-contour step signal processing method of very low frequency long-wave transmitter.The flow process of the method as shown in Figure 2.
In Fig. 2, S200, the analog input signal of very low frequency long-wave transmitter is sampled, and the analog input signal that sampling is obtained is converted to digital input signals.
Concrete, the present invention can by existing high-speed AD (modulus) transducer according to predetermined sampling frequency the analog input signal to transmitter (sine wave) sample, and the analog input signal that sampling is obtained is converted to digital input signals.
S210, the digital input signals after above-mentioned analog-to-digital conversion is carried out to quantification treatment, to obtain the quantized value of this digital input signals.
Concrete, the present invention can be by DSP(digital signal processor) digital input signals after above-mentioned analog-to-digital conversion is carried out to quantification treatment; The i.e. scaling in proportion of so-called quantification treatment, the amplitude of scaling can be determined according to practical application in proportion; A concrete example, maximum true amplitude using the total quantity of the power amplifier unit in very low frequency long-wave transmitter as quantification treatment and minimal negative amplitude, with these two amplitudes, above-mentioned digital input signals is carried out to quantification treatment, thereby the digital input signals after analog-to-digital conversion is after scaling in proportion, can not exceed maximum true amplitude, and can not be less than minimal negative amplitude yet.
For convenience of follow-up flow processing, if digital input signals after scaling in proportion, its result includes decimal, can round scaling result according to the mode rounding up, so that the quantized value of digital input signals is integer.
The concrete example that digital input signals after analog-to-digital conversion is quantized, the in the situation that of including 120 power amplifier units in transmitter, the maximum true amplitude of the quantification treatment of digital input signals is set as+120, minimal negative amplitude is set as to-120, and the quantized value of the digital input signals after continuous multiple analog-to-digital conversion after quantizing is as shown in table 1:
The sample quantization table of table 1 analog input signal
| 0 | 11 | 15 | 20 | 30 | 35 | 44 | 47 | 58 | 64 | 70 | 77 |
| 82 | 88 | 93 | 94 | 102 | 105 | 108 | 112 | 115 | 118 | 118 | 119 |
| 119 | 120 | 120 | 119 | 119 | 118 | 118 | 115 | 112 | 108 | 105 | 102 |
| 94 | 93 | 88 | 82 | 77 | 71 | 64 | 58 | 47 | 44 | 35 | 30 |
| 20 | 15 | 11 | 0 | -11 | -15 | -20 | -30 | -35 | -44 | -47 | -58 |
| -64 | -71 | -77 | -82 | -88 | -93 | -94 | -101 | -105 | -108 | -112 | -118 |
| -119 | -119 | -120 | -120 | -119 | -119 | -118 | -118 | -115 | -112 | -108 | -105 |
| -102 | -94 | -93 | -88 | -82 | -77 | -71 | -64 | -58 | -47 | -44 | -35 |
| -30 | -20 | -15 | -11 | ? | ? | ? | ? | ? | ? | ? | ? |
All quantized values in above-mentioned table 1 are carried out to described point one by one, and each described point is connected with level and smooth curve, its result as shown in Figure 3.In Fig. 3, the sine wave of input signal can obtain amplitude in sampling analog-to-digital conversion and after quantizing be+120 and-120 sine wave.
S220, the ladder height value in the quantized value of above-mentioned digital input signals and predefined non-contour ladder height table is compared, to determine in non-contour ladder height table and the immediate ladder height value of quantized value of this digital input signals.
Concrete, the present invention can be carried out by DSP the compare operation of quantized value and ladder height value.The present invention has set in advance non-contour ladder height table, has as pre-stored in DSP a non-contour ladder height table setting; In this non-contour ladder height table, include all ladders in the waveform of a complete staircase waveform and the correspondence relationship information of ladder height value.Due to the contour ladder height table of table right and wrong that the present invention sets in advance, therefore, in this table, in the difference of the ladder height value of all two adjacent ladders, having two differences at least is not identical (normally plural difference is not identical); That is to say, stepped ladder height value with respect to the ladder height value of low single order, its relative altitude uneven corresponding same numerical value, the corresponding relative altitude of different ladders normally there are differences.
This non-contour ladder height table of the present invention arranges according to ideal sine wave, a concrete setting up procedure is: to the sine wave of optional frequency sample calculating (as digital sample calculate), for a complete ideal sine wave, after the ladder quantity that the total quantity of sampled point can comprise for positive half cycle or the negative half period of a complete staircase waveform and 4 product, with 2 sums, the total quantity of the ladder that complete non-contour staircase waveform comprises is (as the non-contour staircase waveform for based on 12 ladders (being that quarter-wave shape comprises 12 ladders), the total quantity of sampled point should be 4 × 12+2=50), from above-mentioned ideal sine wave, can obtain digital sample point (be digital sample values, also can be called true value), thereby can obtain the truth table of this ideal sine wave, an example of the truth table based on 50 sampled points as described in Table 2, afterwards, digital sample point is carried out to quantification treatment, to obtain sinusoidal wave true value quantization table, the example of the true value quantization table based on 50 sampled points as described in Table 3, the process of the quantification treatment to digital sampled point here can to carry out the process of quantification treatment identical with the digital input signals after above-mentioned analog-to-digital conversion, adopts identical maximum true amplitude and minimal negative amplitude and adopt the mode rounding up to round etc., after quantification treatment, the true value quantization table based on above-mentioned generation arranges non-contour ladder height table, based on table 3 and produce non-contour ladder height table in just half circumferential portion as described in Table 4.
The truth table of table 2 based on 50 sampled points
| 0 | 0.125 | 0.249 | 0.368 | 0.482 | 0.588 | 0.685 | 0.771 | 0.844 | 0.905 |
| 0.951 | 0.982 | 0.998 | 0.998 | 0.982 | 0.951 | 0.905 | 0.844 | 0.771 | 0.685 |
| 0.588 | 0.482 | 0.368 | 0.249 | 0.125 | 0 | -0.125 | -0.249 | -0.368 | -0.482 |
| -0.588 | -0.685 | -0.771 | -0.844 | -0.905 | -0.951 | -0.982 | -0.998 | -0.998 | -0.982 |
| -0.951 | -0.905 | -0.844 | -0.771 | -0.685 | -0.588 | -0.482 | -0.368 | -0.249 | -0.125 |
The true value quantization table of table 3 based on 50 sampled points
Just half circumferential portion in the non-contour ladder height table of table 4 based on 50 sampled points
| The first ladder starting altitude | 0 | ? | ? |
| The first ladder height | 15 | The 7th ladder height | 93 |
| The second ladder height | 30 | The 8th ladder height is | 101 |
| The 3rd ladder height | 44 | The 9th ladder height | 109 |
| Four-step height | 58 | The tenth ladder height | 114 |
| The 5th ladder height | 71 | The 11 ladder height | 118 |
| The 6th ladder height | 82 | The 12 ladder height | 120 |
Comparison procedure of the present invention can be specially: the quantized value (between ladder height value of which two ladder) between which two height that first judges Contemporary Digital input signal; Then, more relatively which in quantized value and this two height (as the ladder height value of two ladders) of Contemporary Digital input signal is more approaching, to determine the quantized value of Contemporary Digital input signal belongs to which position (as which ladder).
The object lesson of a comparison procedure based on table 1 and table 4 is: the quantized value of setting the digital input signals after current analog-to-digital conversion is 0 in table 1, the quantized value 0 that can determine Contemporary Digital input signal according to table 4 is between 0 and 15, and more approach 0, therefore, can determine with table 1 in 0 immediate height value be 0, and corresponding the first ladder original position; The quantized value of setting the digital input signals after current analog-to-digital conversion is 11 in table 1, the quantized value 11 that can determine Contemporary Digital input signal according to table 4 is between 0 and 15, and more approach 15, therefore, can determine with table 1 in 11 immediate ladder height values be 15, and corresponding ladder is the first ladder; The quantized value of setting the digital input signals after current analog-to-digital conversion is 15 in table 1, the quantized value 15 that can determine Contemporary Digital input signal according to table 4 is between 15 and 30, and more approach 15, therefore, can determine with table 1 in 15 immediate ladder height values be 15, and corresponding ladder is the first ladder; The quantized value of setting the digital input signals after current analog-to-digital conversion is 20 in table 1, the quantized value 20 that can determine Contemporary Digital input signal according to table 4 is between 15 and 30, and more approach 15, therefore, can determine with table 1 in 20 immediate ladder height values be 15, and corresponding ladder is the first ladder; The quantized value of setting the digital input signals after current analog-to-digital conversion is 30 in table 1, the quantized value 30 that can determine Contemporary Digital input signal according to table 4 is between 30 and 44, and more approach 30, therefore, can determine with table 1 in 30 immediate ladder height values be 30, and corresponding ladder is the second ladder.
S230, the above-mentioned immediate ladder height value relatively obtaining is defined as to the ladder height value of Contemporary Digital input signal.
Concrete, if ladder height value corresponding each digital input signals is pooled together and showed by the form of table, can form a ladder allocation table, based on above-mentioned table 1 and table 4 and the ladder allocation table of generation as described in Table 5.
Table 5 ladder allocation table
| 0 | 15 | 15 | 15 | 30 | 30 | 44 | 44 | 58 | 58 | 58 | 71 |
| 82 | 82 | 93 | 93 | 101 | 101 | 101 | 109 | 114 | 118 | 118 | 118 |
| 118 | 120 | 120 | 118 | 118 | 118 | 118 | 114 | 109 | 101 | 101 | 101 |
| 93 | 93 | 82 | 82 | 71 | 71 | 58 | 58 | 44 | 44 | 30 | 30 |
| 15 | 15 | 0 | 0 | 0 | -15 | -15 | -30 | -30 | -44 | -44 | -58 |
| -58 | -71 | -71 | -82 | -82 | -93 | -93 | -101 | -101 | -101 | -109 | -118 |
| -118 | -118 | -120 | -120 | -118 | -118 | -118 | -118 | -114 | -109 | -101 | -101 |
| -101 | -93 | -93 | -82 | -82 | -71 | -71 | -58 | -58 | -44 | -44 | -30 |
| -30 | -15 | -15 | 0 | ? | ? | ? | ? | ? | ? | ? | ? |
Wherein, the ladder height value of the negative number representation digital input signals in above-mentioned table 5, in staircase waveform negative half-cycle, needs the anti-phase corresponding power amplifier unit of opening.Ladder allocation table can fully demonstrate the ladder height value of ladder under each digital input signals and affiliated ladder thereof.
Can draw out the non-contour staircase waveform based on 12 ladders shown in (b) in Fig. 4 according to table 4 and table 5; And (a) in Fig. 4 draws out and forms according to table 1.
S240, produce the control signal of corresponding power amplifier unit in very low frequency long-wave transmitter according to the ladder height value of Contemporary Digital input signal, and export this control signal to this corresponding power amplifier unit.
Concrete, the present invention can carry out the operation to power amplifier unit below control signal by FPGA, and FPGA has strict sequential function.The control signal is here opened control signal or anti-phase control signal, voltage control signal and timing control signal etc. opened as positive.Ladder information and ladder height information that FPGA can come according to DSP transmission, control feature based on power amplifier unit produces corresponding timing control signal for corresponding power amplifier unit, this timing control signal is through careful algorithm design, can ensure that power amplifier unit is strict symmetrical in phase place completely.
In the situation that using FPGA, this FPGA has multiple I/O interfaces, directly be connected with each power amplifier unit by I/O interface, corresponding which ladder of each power amplifier unit (i.e. corresponding which ladder height value) arranges decision by the software in FPGA, thereby realize being connected based on " soft interface " and power amplifier unit truly, this " soft interface " not only can be realized the independent of each power amplifier unit controlled, and, also each power amplifier unit can be dispensed on any ladder.
A concrete example of the non-contour staircase waveform of transmitter output of the present invention is as shown in Fig. 5 and Fig. 6 b.Fig. 5 and Fig. 6 b show the waveform of the non-contour staircase waveform based on 12 ladders of transmitter output of the present invention, and Fig. 6 a is the sine wave obtaining based on table 1 described point.By Fig. 5 or comparison diagram 6(a) and Fig. 6 (b) can find out very intuitively, the non-contour staircase waveform obtaining by said method of the present invention can by signal source produce input signal more perfectly portray out.
Signal to noise ratio by the signal to noise ratio of the contour staircase waveform to existing transmitter output and the non-contour staircase waveform based on 12 ladders of transmitter of the present invention output is carried out Measurement and Computation, and result proves that the signal to noise ratio of not contour staircase waveform of the present invention can improve 10dB than the signal to noise ratio of existing contour staircase waveform.
Embodiment bis-, the non-contour step signal processing unit of very low frequency long-wave transmitter.The structure of this device as shown in Figure 7.
In Fig. 7, this non-contour step signal processing unit mainly comprises: sampling module 1, quantization modules 2, control module 3 and Executive Module 4.Wherein, quantization modules 2 is connected respectively with sampling module 1 and control module 3, and control module 3 is also connected with Executive Module 4, and Executive Module 4 is also connected with the each power amplifier unit in transmitter.
Sampling module 1 is mainly used according to predetermined sampling frequency, the analog input signal of very low frequency long-wave transmitter being sampled, and the analog input signal that sampling is obtained is converted to digital input signals.
Sampling module 1 can be existing high-speed AD (modulus) transducer, be high-speed A/D converter according to predetermined sampling frequency the analog input signal to transmitter (sine wave) sample, and the analog input signal of sampling acquisition is converted to digital input signals, be transferred to quantization modules 2.
The digital input signals that quantization modules 2 is mainly used in sampling module 1 to export carries out quantification treatment, to obtain the quantized value of digital input signals.
Quantization modules 2 can be realized by DSP.And quantization modules 2 can be using the total quantity of the power amplifier unit in transmitter as quantification treatment maximum true amplitude and minimal negative amplitude, carry out quantification treatment with these two amplitudes digital input signals that 1 transmission comes to sampling module, thereby the quantized value that quantization modules 2 produces can not exceed maximum true amplitude, and can not be less than minimal negative amplitude yet.
For convenience of follow-up flow processing, quantization modules 2 is after scaling in proportion, if scaling result includes decimal, quantization modules 2 can round scaling result according to the mode of rounding up, so that the quantized value of digital input signals is integer.
Pre-stored in control module 3 have a non-contour ladder height table, the ladder height value that control module 3 is mainly used in quantized value and this non-contour ladder height table of the digital input signals that quantization modules 2 is exported compares, to determine in non-contour ladder height table and the immediate ladder height value of quantized value of digital input signals, and this immediate ladder height value of determining is defined as to the ladder height value of digital input signals.
Control module 3 can be realized by DSP, and quantization modules 2 and control module 3 are integrated in DSP.In control module 3, in the non-contour ladder height table of storage, include all ladders in a complete waveform and the correspondence relationship information of ladder height value, and in the difference of the ladder height value of all two adjacent ladders, have two differences not identical (normally plural difference is not identical) at least.
This non-contour ladder height table arranges according to ideal sine wave, a concrete setting up procedure is: DSP is to the calculating of sampling of the sine wave of optional frequency, for a complete ideal sine wave, after the ladder quantity that the total quantity of sampled point can comprise for positive half cycle or the negative half period of a complete staircase waveform and 4 product, with 2 sums, the total quantity of the ladder that complete non-contour staircase waveform comprises is (as the non-contour staircase waveform for based on 12 ladders (being that quarter-wave shape comprises 12 ladders), the total quantity of sampled point should be 4 × 12+2=50), DSP can obtain digital sample point (being digital sample values, is also true value) from ideal sine wave, thereby DSP can obtain sinusoidal wave truth table, afterwards, digital sample point is carried out quantification treatment by DSP, to obtain sinusoidal wave true value quantization table, the process of the quantification treatment here can to carry out the process of quantification treatment identical with the digital input signals after above-mentioned analog-to-digital conversion, adopts identical maximum true amplitude and minimal negative amplitude and adopt the mode rounding up to round etc., after quantification treatment, the true value quantization table of DSP based on above-mentioned generation arranges non-contour ladder height table.
The ladder height value that Executive Module 4 is mainly used in the digital input signals of determining according to control module 3 produces the control signal of corresponding power amplifier unit in very low frequency long-wave transmitter, and to this corresponding power amplifier unit output control signal, this control signal is opened control signal or anti-phase control signal, voltage control signal and timing control signal etc. opened as positive.
Executive Module 4 can be realized by FPGA, and the I/O interface of FPGA is directly connected with the each power amplifier unit in transmitter, FPGA can control each power amplifier unit in which ladder with and in the ladder height value of ladder.
Concrete operations and the object lesson of table etc. that above-mentioned each module is carried out can, referring to the description in said method embodiment, not be repeated.
The above is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, but not in order to limit technology of the present invention, any those skilled in the art are not departing within the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. the non-contour step signal processing method of very low frequency long-wave transmitter, is characterized in that, described method comprises:
Analog input signal to very low frequency long-wave transmitter is sampled, and the analog input signal that sampling is obtained is converted to digital input signals;
Described digital input signals is carried out to quantification treatment, to obtain the quantized value of digital input signals;
Ladder height value in the quantized value of described digital input signals and predefined non-contour ladder height table is compared, to determine in described non-contour ladder height table and the immediate ladder height value of quantized value of described digital input signals, and described immediate ladder height value is defined as to the ladder height value of described digital input signals;
Produce the control signal of corresponding power amplifier unit in very low frequency long-wave transmitter according to the ladder height value of described digital input signals, and export described control signal to described corresponding power amplifier unit;
Wherein, in the difference of the ladder height value of two all adjacent ladders in described non-contour ladder height table, have at least two differences not identical.
2. the method for claim 1, is characterized in that, describedly described digital input signals is carried out to quantification treatment comprises:
The quantity of the power amplifier unit in described very low frequency long-wave transmitter is carried out to quantification treatment as maximum true amplitude and the minimal negative amplitude of quantification treatment to described digital input signals respectively.
3. the method for claim 1, is characterized in that, the set-up mode of described non-contour ladder height table comprises:
Optional frequency desirable complete sine wave is sampled, and sampled result is quantized, to obtain this sinusoidal wave true value quantization table;
According to the true value quantization table of described sine wave, described non-contour ladder height table is set;
Wherein, described sampled result is quantized to comprise: the quantity of the power amplifier unit in described very low frequency long-wave transmitter is quantized described sampled result as maximum true amplitude and the minimal negative amplitude of quantification treatment respectively.
4. method as claimed in claim 3, it is characterized in that, the described sampled point quantity that optional frequency desirable complete sine wave is sampled for: after the product of the positive half cycle of a complete staircase waveform or the ladder quantity that negative half period comprises and 4, with 2 sums.
5. method as claimed in claim 1 or 2 or 3 or 4, is characterized in that, in a complete described staircase waveform, having at least the quantity of two corresponding power amplifier units of ladder not identical.
6. the non-contour step signal processing unit of very low frequency long-wave transmitter, is characterized in that, described device comprises:
Sampling module, for the analog input signal of very low frequency long-wave transmitter is sampled, and the analog input signal that sampling is obtained is converted to digital input signals;
Quantization modules, for described digital input signals is carried out to quantification treatment, to obtain the quantized value of digital input signals;
Control module, for the ladder height value of the quantized value of described digital input signals and predefined non-contour ladder height table is compared, to determine in described non-contour ladder height table and the immediate ladder height value of quantized value of described digital input signals, and described immediate ladder height value is defined as to the ladder height value of described digital input signals;
Executive Module, for produce the control signal of the corresponding power amplifier unit of very low frequency long-wave transmitter according to the ladder height value of described digital input signals, and exports described control signal to described corresponding power amplifier unit;
Wherein, in the difference of the ladder height value of two all adjacent ladders in described non-contour ladder height table, have at least two differences not identical.
7. device as claimed in claim 6, is characterized in that, described device is the digital staircase waveform modulator in transmitter, is arranged between signal source and each power amplifier unit.
8. device as claimed in claim 6, is characterized in that, described quantization modules is carried out quantification treatment as maximum true amplitude and the minimal negative amplitude of quantification treatment to described digital input signals respectively using the quantity of the power amplifier unit in described very low frequency long-wave transmitter.
9. the device as described in claim 6 or 7 or 8, it is characterized in that, described sampling module is realized by analog to digital converter, and described quantization modules and control module are realized by digital signal processor DSP, and described Executive Module is realized by on-site programmable gate array FPGA.
10. device as claimed in claim 9, is characterized in that, described non-contour ladder height table arranges according to following manner:
Described DSP samples to optional frequency desirable complete sine wave, and sampled result is quantized, to obtain this sinusoidal wave true value quantization table;
Described DSP arranges described non-contour ladder height table according to the true value quantization table of described sine wave;
Wherein, described sampled result is quantized to comprise: described DSP quantizes as maximum true amplitude and the minimal negative amplitude of quantification treatment the quantity of the power amplifier unit in described very low frequency long-wave transmitter respectively to described sampled result.
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