CN102545891B - Digital signal frequency discriminator and frequency discriminating method - Google Patents
Digital signal frequency discriminator and frequency discriminating method Download PDFInfo
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Abstract
The invention discloses a digital signal frequency discriminator and a frequency discriminating method. The digital signal frequency discriminator can be used for directly estimating a frequency deviation value according to an integral result of a current integral time unit, but the result of a historical integral time unit is not needed to be waited, so that the negative effect of data bit jumping to a conventional frequency discriminator is eliminated.
Description
Technical field
The present invention relates to the electron trade digital processing field, relate in particular to a kind of digital signal frequency discriminator and frequency discrimination method.
Background technology
At present, GLONASS (Global Navigation Satellite System) (Global Navigation Satellite System, guide number SS) the signal trace technology adopts phase-locked loop (Phase Locked Loop is called for short PLL) and FLL (Frequency Locked Loop is called for short FLL) technology more.PLL has the advantages such as phase noise characteristic is good, but capture range and dynamically just not fully up to expectations; FLL is because follow the tracks of the frequency of input signal, so capture range and dynamically all be better than PLL, so the applications of and small-signal dynamic at height is more, but its phase noise is larger.Because the GNSS signal adopts CDMA (Code Division Multiple Access) more, in order to obtain large as far as possible processing gain, the correlation intergal time of tracking loop, the longer the better; But because saltus step can occur the adjacent data bit, so the longest general correlation intergal time is the length of data bit.Fig. 1 is the block diagram of realizing of prior art digital signal frequency discriminator.The result of unit when as shown in Figure 1, the structure of conventional frequency discriminator often relates to adjacent two integrations.The calculating of frequency error has several mode, and is as shown in Table 1 commonly used:
Table one: several frequency discriminators commonly used and characteristic thereof
Because the data bit saltus step is equivalent to a phase step for carrier phase, be exactly a frequency discontinuity so be reflected on frequency, will certainly produce harmful effect to the output of frequency discriminator if can not eliminate this mutation effect.At present for the impact of data bit saltus step, often take the method that afterwards detects, when current integral result and previous integral result single spin-echo being detected, do not adopt the output of current frequency discriminator to adjust the FLL loop.The time interval that can make the FLL loop adjust so on the one hand is inconsistent, also can affect on the other hand the tracking noise characteristic of FLL loop.An extreme example, if saltus step always occurs the adjacent data bit, the FLL loop just loses the adjustment function.
In realizing process of the present invention, the inventor recognizes that there is following technical problem in prior art: unit when frequency discriminator needs historical integration, can not avoid the data bit saltus step on the impact of frequency discriminator output.
Summary of the invention
The technical problem that (one) will solve
For above-mentioned technical problem, the present invention proposes a kind of digital signal frequency discriminator.The integral result of unit when this frequency discriminator only needs current integration has been evaded the variation of a upper data bit to the impact of current frequency discriminator output, makes loop correlation intergal time span no longer be subjected to the impact of data bit length.
(2) technical scheme
According to an aspect of the present invention, provide a kind of digital signal frequency discriminator, comprised forward off frequency carrier passage, negative sense off frequency carrier passage, frequency deviation energy difference unit and frequency adjustment unit.Forward off frequency carrier passage, be connected with local carrier equipment with input intermediate frequency equipment, be used for adding default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment produces, obtain forward off frequency carrier signal, the input intermediate-freuqncy signal of forward off frequency carrier signal and the input of input intermediate frequency equipment is done correlation intergal, obtain the energy of forward off frequency carrier signal.Negative sense off frequency carrier passage, be connected with local carrier equipment with input intermediate frequency equipment, be used for subtracting default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment produces, obtain negative sense off frequency carrier signal, the input intermediate-freuqncy signal of negative sense off frequency carrier signal and the input of input intermediate frequency equipment is done correlation intergal, obtain the energy of negative sense off frequency carrier signal.Frequency deviation energy difference unit is connected with negative sense off frequency carrier passage with forward off frequency carrier passage, is used for the energy according to forward off frequency carrier signal and negative sense off frequency carrier signal, obtains positive negative frequency deviation energy difference signal.The frequency adjustment unit is connected with local carrier equipment with frequency deviation energy difference unit, is used for according to positive negative frequency deviation energy difference signal, the local intermediate-freuqncy signal of local carrier equipment being adjusted.
Preferably, in digital signal frequency discriminator of the present invention, default frequency deviation is set according to required frequency discrimination indicatrix and correlation intergal time span, and the correlation intergal time is for obtaining the correlation intergal time of forward/negative sense off frequency carrier signal energy.Optimally, default frequency deviation is to make the digital signal frequency discriminator work in the frequency deviation of the linear zone of frequency discrimination indicatrix.
Preferably, digital signal frequency discriminator of the present invention also comprises local intermediate-freuqncy signal passage and energy difference normalization unit.Local intermediate-freuqncy signal passage is connected with local carrier equipment with input intermediate frequency equipment, is used for doing correlation intergal according to local intermediate-freuqncy signal and input intermediate-freuqncy signal, obtains the energy of local intermediate-freuqncy signal.Energy difference normalization unit is connected with frequency deviation energy difference unit with local intermediate-freuqncy signal passage, is used for the energy value according to local intermediate-freuqncy signal, aligns negative frequency deviation energy difference signal and carries out normalized.The frequency adjustment unit is connected with energy difference normalization unit, is used for according to the positive negative frequency deviation energy difference signal after normalized, and the local intermediate-freuqncy signal of local carrier equipment is adjusted.Optimally, forward off frequency carrier passage, negative sense off frequency carrier passage and local intermediate-freuqncy signal passage are processed based on synchronous input intermediate-freuqncy signal.
Preferably, digital signal frequency discriminator of the present invention also comprises: phase discriminator, be connected with local intermediate-freuqncy signal passage, and be used for obtaining amount of phase error according to the input intermediate-freuqncy signal, local intermediate-freuqncy signal is carried out the phase-locked loop adjustment.
Preferably, digital signal frequency discriminator of the present invention also comprises: the loop filtering unit, be connected between frequency deviation energy difference unit and frequency adjustment unit, and be used for the noise of the positive negative frequency deviation energy difference of filtering signal.
Preferably, in digital signal frequency discriminator of the present invention, forward off frequency carrier passage comprises the first multiplier and first integrator.Wherein: this first multiplier, be connected with local carrier equipment with input intermediate frequency equipment, be used for adding default frequency deviation on local intercarrier signal, obtain forward off frequency carrier signal; This first integrator is connected with the first multiplier, is used for obtaining by correlation intergal the energy of forward off frequency carrier signal.Negative sense off frequency carrier passage comprises the second multiplier and second integral device, wherein: this second multiplier, be connected with local carrier equipment with input intermediate frequency equipment, be used for subtracting default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment produces, obtain negative sense off frequency carrier signal; This second integral device is connected with the second multiplier, is used for obtaining by correlation intergal the energy of negative sense off frequency carrier signal.
Preferably, in digital signal frequency discriminator of the present invention, the frequency adjustment unit is voltage controlled oscillator, and frequency deviation energy difference unit is subtracter.
A kind of method of digital signal frequency discrimination also is provided according to another aspect of the present invention.The method comprises: add default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment produces, obtain forward off frequency carrier signal, the input intermediate-freuqncy signal of forward off frequency carrier signal and the input of input intermediate frequency equipment is done correlation intergal, obtain the energy of forward off frequency carrier signal; Subtract default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment produces, obtain negative sense off frequency carrier signal, the input intermediate-freuqncy signal of negative sense off frequency carrier signal and the input of input intermediate frequency equipment is done correlation intergal, obtain the energy of negative sense off frequency carrier signal; According to the energy of forward off frequency carrier signal and negative sense off frequency carrier signal, obtain positive negative frequency deviation energy difference signal; According to positive negative frequency deviation energy difference signal, local intermediate-freuqncy signal is adjusted.
(3) beneficial effect
Digital signal frequency discriminator of the present invention and frequency discrimination method, in the time of can be according to current integration, the integral result direct estimation of unit goes out frequency deviation value, and the result of unit when need not to wait for historical integration, eliminated on the one hand the negative effect of data bit saltus step to conventional frequency discriminator, the correlation intergal time be can improve on the other hand, thereby dynamic range and the noise characteristic of FLL track loop promoted.
Description of drawings
Fig. 1 is the block diagram of realizing of prior art digital signal frequency discriminator;
Fig. 2 is the schematic diagram of embodiment of the present invention digital signal frequency discriminator;
Fig. 3 is the schematic diagram of embodiment of the present invention digital signal frequency discriminator;
Fig. 4 is the schematic diagram of embodiment of the present invention digital signal frequency discriminator;
Fig. 5 is the flow chart of embodiment of the present invention digital signal frequency discrimination method;
Fig. 6 is the schematic diagram of embodiment of the present invention digital signal frequency discriminator;
Fig. 7 is the schematic diagram of embodiment of the present invention digital signal frequency discriminator carrier wave frequency deviation;
Fig. 8 is the kam-frequency characteristic that embodiment of the present invention digital signal frequency discriminator arranges according to the first frequency deviation;
Fig. 9 is the kam-frequency characteristic that embodiment of the present invention digital signal frequency discriminator arranges according to the second frequency deviation;
Figure 10 is the kam-frequency characteristic that embodiment of the present invention digital signal frequency discriminator arranges according to the 3rd frequency deviation.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Understand for convenience the present invention, at first some concepts that occur in the present invention are described.In the present invention, the input intermediate-freuqncy signal refer to from antenna reception to and the signal that obtains by the radio frequency mixing; Local intermediate-freuqncy signal is the local carrier signal that produces, and forward off frequency carrier signal and negative sense off frequency carrier signal are all the local carrier signal that produces, but compare the default frequency deviation with forward and negative sense with local intermediate-freuqncy signal.
Fig. 2 is the schematic diagram of embodiment of the present invention digital signal frequency discriminator.As shown in Figure 2, in one exemplary embodiment of the present invention, the digital signal frequency discriminator comprises: forward off frequency carrier passage 201, negative sense off frequency carrier passage 202, frequency deviation energy difference unit 203 and frequency adjustment unit 204.Wherein, forward off frequency carrier passage 201, be connected with local carrier equipment 300 with input intermediate frequency equipment 200, be used for adding default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment 300 produces, obtain forward off frequency carrier signal, the input intermediate-freuqncy signal of forward off frequency carrier signal and 200 inputs of input intermediate frequency equipment is done correlation intergal, obtain the energy of forward off frequency carrier signal; Negative sense off frequency carrier passage 202, be connected with local carrier equipment 300 with input intermediate frequency equipment 200, be used for subtracting default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment 300 produces, obtain negative sense off frequency carrier signal, the input intermediate-freuqncy signal of negative sense off frequency carrier signal and 200 inputs of input intermediate frequency equipment is done correlation intergal, obtain the energy of negative sense off frequency carrier signal; Frequency deviation energy difference unit 203 is connected with negative sense off frequency carrier passage 202 with forward off frequency carrier passage 201, is used for the energy according to forward off frequency carrier signal and negative sense off frequency carrier signal, obtains positive negative frequency deviation energy difference signal; Frequency adjustment unit 204 is connected with frequency deviation energy difference unit 203, is used for according to positive negative frequency deviation energy difference signal, the local intermediate-freuqncy signal of local carrier equipment 300 being adjusted.
Preferably, in the present embodiment, default frequency deviation is set according to required frequency discrimination indicatrix and correlation intergal time span, and the correlation intergal time is for obtaining the time of integration of forward/negative sense off frequency carrier signal energy.Optimally, default frequency deviation is to make the digital signal frequency discriminator work in the frequency deviation of the linear zone of frequency discrimination indicatrix.
The integral result of unit when the digital signal frequency discriminator that the present embodiment provides only needs current integration, evaded the variation of a upper data bit to the impact of current frequency discriminator output, make loop correlation intergal time span no longer be subjected to the impact of data bit length, improved its frequency discrimination performance.
Fig. 3 is the schematic diagram of embodiment of the present invention digital signal frequency discriminator.As shown in Figure 3, in further embodiment of the present invention, the digital signal frequency discriminator also comprises local intermediate frequency carrier passage 301 and energy difference normalization unit 302, wherein: local intermediate frequency carrier passage 301, be connected with local carrier equipment 300 with input intermediate frequency equipment 200, be used for doing correlation intergal according to local intermediate-freuqncy signal and input intermediate-freuqncy signal, obtain the energy of local intermediate-freuqncy signal; Energy difference normalization unit 302 is connected with frequency deviation energy difference unit 203 with local intermediate-freuqncy signal passage 301, also is used for the energy value according to local intermediate-freuqncy signal, aligns negative frequency deviation energy difference signal and carries out normalized; Frequency adjustment unit 204 is connected with energy difference normalization unit 302, is used for according to the positive negative frequency deviation energy difference signal after normalized, and local intermediate-freuqncy signal is adjusted.Preferably, in the present embodiment, forward off frequency carrier passage, negative sense off frequency carrier passage and local intermediate-freuqncy signal passage carry out based on synchronous input intermediate-freuqncy signal.
The energy of the local intercarrier signal of the digital signal frequency discriminator utilization that the present embodiment provides aligns negative frequency deviation energy difference signal and carries out normalized.The energy difference signal that above-mentioned normalized can reduce positive negative frequency deviation is as far as possible inputted the impact of intermediate-freuqncy signal energy changing, especially in the suddenly big or suddenly small situation of input signal, such as the situation that constantly is blocked or reflects at built-up regional signal.Therefore, add the energy normalized unit in the digital signal frequency discriminator, can improve the precision of positive negative frequency deviation energy signal, further improved the frequency discrimination performance of digital signal frequency discriminator.
Fig. 4 is the schematic diagram of embodiment of the present invention digital signal frequency discriminator.As shown in Figure 4, in a preferred embodiment of the invention, the digital signal frequency discriminator also comprises phase discriminator 401, wherein: phase discriminator 401, be connected with local intermediate-freuqncy signal passage 301, be used for obtaining amount of phase error according to the input intermediate-freuqncy signal, local intermediate-freuqncy signal is carried out the phase-locked loop adjustment.The digital signal frequency discriminator also comprises loop filtering unit 402, wherein: loop filtering unit 402, be connected between frequency deviation energy difference unit 203 and frequency adjustment unit 302, be used for the noise of the positive negative frequency deviation energy difference of filtering signal.
When the digital signal frequency discriminator of the present embodiment only utilizes current integration, the integral result of unit just draws frequency deviation information, and the integral result of unit need not depend on history the time, adopted simultaneously irrelevant Integral Technology, make the saltus step of telegraph text data bit for the not impact of output of frequency discriminator, thereby make the adjustment of FLL loop more steady, the correlation intergal time be can increase, thereby dynamic range and the noise characteristic of FLL track loop promoted.
Corresponding with above-mentioned device embodiment, the present invention also provides a kind of method of digital signal frequency discrimination.Fig. 5 is the flow chart of embodiment of the present invention digital signal frequency discrimination method.As shown in Figure 5, the method comprises:
Step S502, add default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment produces, obtain forward off frequency carrier signal, the input intermediate-freuqncy signal of forward off frequency carrier signal and the input of input intermediate frequency equipment is done correlation intergal, obtain the energy of forward off frequency carrier signal;
Step S504, subtract default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment produces, obtain negative sense off frequency carrier signal, the input intermediate-freuqncy signal of negative sense off frequency carrier signal and the input of input intermediate frequency equipment is done correlation intergal, obtain the energy of negative sense off frequency carrier signal;
Step S506 according to the energy of forward off frequency carrier signal and negative sense off frequency carrier signal, obtains positive negative frequency deviation energy difference signal;
Step S508 according to positive negative frequency deviation energy difference signal, adjusts local intermediate-freuqncy signal.
In this article, all additional technical features all are applicable to device embodiment and embodiment of the method simultaneously, and explanation no longer separately.Below will take concrete device as example, optimum embodiment of the present invention be described.
The invention provides the method for the digital signal frequency discrimination in a kind of GNSS receiver, the method is by increasing two-way I, the Q integrator, carry out integration with forward off frequency carrier signal, negative sense off frequency carrier signal respectively, obtain difference on the frequency by the two paths of signals energy difference, this difference on the frequency refers to input the difference on the frequency of intermediate-freuqncy signal and local intermediate-freuqncy signal.
Fig. 6 is the schematic diagram of embodiment of the present invention digital signal frequency discriminator.As shown in Figure 6, in the present embodiment, in the carrier tracking loop (Costas loop) of routine, increase a forward off frequency carrier passage and a negative sense off frequency carrier passage, each passage comprises an I road integrator (2) and multiplier (1), and a Q road integrator (2) and multiplier (1).The I of forward off frequency carrier, Q integrator are corresponding to cos (ω
I+ ω
D) t and sin (ω
I+ ω
D) t, the I of negative sense carrier wave frequency deviation, the Q integrator is corresponding to cos (ω
I-ω
D) t and sin (ω
I-ω
D) t.On the basis of above-mentioned hardware, the method for the present embodiment comprises the following steps:
Step 12, on the output basis of local intermediate-freuqncy signal NCO, add a forward frequency deviation and a negative sense frequency deviation, and output homophase and quadrature carrier components, wherein, the value of two-way carrier shift should be relatively local intermediate-freuqncy signal symmetrical, frequency values of its concrete skew is determined by required frequency demodulation characteristic.
Fig. 7 is the schematic diagram of embodiment of the present invention digital signal frequency discriminator carrier wave frequency deviation.In Fig. 7, mid portion is conventional numerically-controlled oscillator (Numerical Controlled Oscillator, be called for short NCO), it is the NCO component of local intermediate-freuqncy signal, on this basis, its NCO is arranged to be increased respectively frequency deviation and reduces frequency deviation, as shown in Fig. 7 middle and upper part and bottom, obtains forward and negative sense carrier wave frequency deviation component respectively;
Step S14, at two-way I, the Q integrator carries out energy integral to input intermediate-freuqncy signal, forward off frequency carrier and negative sense off frequency carrier respectively, in this step, forward off frequency carrier correlation intergal, negative sense off frequency carrier energy integral should with local intermediate-freuqncy signal correlation intergal sync correlation input signal in time, namely three tunnel correlation intergals are all to carry out for identical input intermediate-freuqncy signal;
Step S16 is with the energy of forward frequency deviation integral result
Energy with negative sense frequency deviation integral result
Want to subtract, obtain positive negative frequency deviation energy difference; The I of the result of forward and negative sense frequency deviation correlation intergal, Q component carries out irrelevant processing
Make final energy difference not be subjected to the impact of data bit symbol;
Step S18 after positive negative frequency deviation energy difference is carried out normalized, just obtains the difference on the frequency of local intercarrier signal and input intermediate-freuqncy signal;
Step S20 gives with difference on the frequency the adjustment that loop filter carries out loop tracks, and preferably, the normalization process of positive negative frequency deviation energy difference can level and smooth later result be carried out according to the energy of local intermediate-freuqncy signal integration;
Step S22 simultaneously, can also obtain amount of phase error according to the integral result of local intermediate-freuqncy signal component, carries out the adjustment of PLL.
Fig. 8-10 are the kam-frequency characteristic that embodiment of the present invention digital signal frequency discriminator arranges according to different frequency deviations; The correlation intergal time span of Fig. 8, Fig. 9, Figure 10 is 1 millisecond, and positive negative frequency deviation is respectively 500Hz, and 200Hz and 100Hz can find out the frequency discrimination curve under different frequency deviations arrange.Should choose flexibly positive negative frequency deviation according to the linear characteristic of frequency discrimination curve and correlation intergal time span in actual the use and set, the principle of its set point is to make frequency discriminator work in the drawings in the linear zone of redlining.And the difference on the frequency of frequency discriminator output also should determine real frequency values according to correlation intergal duration and normaliztion constant.
Digital signal frequency discriminator of the present invention and frequency discrimination method, in the time of can be according to current integration, the integral result direct estimation of unit goes out frequency deviation value, and the result of unit when need not to wait for historical integration, eliminated on the one hand the negative effect of data bit saltus step to conventional frequency discriminator, the correlation intergal time be can improve on the other hand, thereby dynamic range and the noise characteristic of FLL track loop promoted.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (13)
1. a digital signal frequency discriminator, is characterized in that, comprises forward off frequency carrier passage, negative sense off frequency carrier passage, frequency deviation energy difference unit and frequency adjustment unit, wherein:
Described forward off frequency carrier passage, be connected with local carrier equipment with input intermediate frequency equipment, be used for adding default frequency deviation on the local intermediate-freuqncy signal that described local carrier equipment produces, obtain forward off frequency carrier signal, the input intermediate-freuqncy signal of described forward off frequency carrier signal and the input of described input intermediate frequency equipment is done correlation intergal, obtain the energy of described forward off frequency carrier signal;
Described negative sense off frequency carrier passage, be connected with local carrier equipment with input intermediate frequency equipment, be used for subtracting described default frequency deviation on the local intermediate-freuqncy signal that described local carrier equipment produces, obtain negative sense off frequency carrier signal, the input intermediate-freuqncy signal of described negative sense off frequency carrier signal and the input of described input intermediate frequency equipment is done correlation intergal, obtain the energy of described negative sense off frequency carrier signal;
Described frequency deviation energy difference unit is connected with negative sense off frequency carrier passage with described forward off frequency carrier passage, is used for the energy according to described forward off frequency carrier signal and negative sense off frequency carrier signal, obtains positive negative frequency deviation energy difference signal;
Described frequency adjustment unit is connected with described local carrier equipment with described frequency deviation energy difference unit, is used for according to described positive negative frequency deviation energy difference signal, and the local intermediate-freuqncy signal of local carrier equipment is adjusted.
2. digital signal frequency discriminator according to claim 1, it is characterized in that, described default frequency deviation is set according to required frequency discrimination indicatrix and correlation intergal time span, and the described correlation intergal time is for obtaining the correlation intergal time of described forward off frequency carrier signal energy and negative sense off frequency carrier signal energy.
3. digital signal frequency discriminator according to claim 2, is characterized in that, described default frequency deviation is to make described digital signal frequency discriminator work in the frequency deviation of the linear zone of described frequency discrimination indicatrix.
4. digital signal frequency discriminator according to claim 1, is characterized in that, also comprises local intermediate-freuqncy signal passage and energy difference normalization unit, wherein:
Described local intermediate-freuqncy signal passage is connected with local carrier equipment with described input intermediate frequency equipment, is used for doing correlation intergal according to local intermediate-freuqncy signal and input intermediate-freuqncy signal, obtains the energy of described local intermediate-freuqncy signal;
Described energy difference normalization unit is connected with described frequency deviation energy difference unit with described local intermediate-freuqncy signal passage, is used for the energy value according to described local intermediate-freuqncy signal, and described positive negative frequency deviation energy difference signal is carried out normalized;
Described frequency adjustment unit is connected with described energy difference normalization unit, is used for according to the described positive negative frequency deviation energy difference signal after described normalized, and the local intermediate-freuqncy signal of local carrier equipment is adjusted.
5. digital signal frequency discriminator according to claim 4, is characterized in that, described forward off frequency carrier passage, negative sense off frequency carrier passage and local intermediate-freuqncy signal passage are processed based on synchronous input intermediate-freuqncy signal.
6. digital signal frequency discriminator according to claim 4, is characterized in that, this digital signal frequency discriminator also comprises:
Phase discriminator is connected with described local intermediate-freuqncy signal passage, is used for obtaining amount of phase error according to described input intermediate-freuqncy signal, and local intermediate-freuqncy signal is carried out the phase-locked loop adjustment.
7. digital signal frequency discriminator according to claim 1, is characterized in that, also comprises:
The loop filtering unit is connected between described frequency deviation energy difference unit and frequency adjustment unit, is used for the noise of the described positive negative frequency deviation energy difference signal of filtering.
8. the described digital signal frequency discriminator of any one according to claim 1-7 is characterized in that:
Described forward off frequency carrier passage comprises the first multiplier and first integrator, wherein: this first multiplier, be connected with local carrier equipment with described input intermediate frequency equipment, be used for adding default frequency deviation on described local intercarrier signal, obtain forward off frequency carrier signal; This first integrator is connected with described the first multiplier, is used for obtaining by correlation intergal the energy of described forward off frequency carrier signal;
Described negative sense off frequency carrier passage comprises the second multiplier and second integral device, wherein: this second multiplier, be connected with local carrier equipment with described input intermediate frequency equipment, be used for subtracting described default frequency deviation on the local intermediate-freuqncy signal that described local carrier equipment produces, obtain negative sense off frequency carrier signal; This second integral device is connected with described the second multiplier, is used for obtaining by correlation intergal the energy of described negative sense off frequency carrier signal.
9. the described digital signal frequency discriminator of any one according to claim 1-7, is characterized in that, described frequency adjustment unit is voltage controlled oscillator, and described frequency deviation energy difference unit is subtracter.
10. the method for a digital signal frequency discrimination, be applied to a digital signal frequency discriminator, it is characterized in that, comprising:
Add default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment produces, obtain forward off frequency carrier signal, the input intermediate-freuqncy signal of described forward off frequency carrier signal and the input of input intermediate frequency equipment is done correlation intergal, obtain the energy of described forward off frequency carrier signal;
Subtract described default frequency deviation on the local intermediate-freuqncy signal that described local carrier equipment produces, obtain negative sense off frequency carrier signal, the input intermediate-freuqncy signal of described negative sense off frequency carrier signal and the input of described input intermediate frequency equipment is done correlation intergal, obtain the energy of described negative sense off frequency carrier signal;
According to the energy of described forward off frequency carrier signal and negative sense off frequency carrier signal, obtain positive negative frequency deviation energy difference signal;
According to described positive negative frequency deviation energy difference signal, local intermediate-freuqncy signal is adjusted.
11. the method for digital signal frequency discrimination according to claim 10, it is characterized in that, described default frequency deviation is set according to required frequency discrimination indicatrix and correlation intergal time span, and the described correlation intergal time is for obtaining the time of integration of described forward off frequency carrier signal energy and negative sense off frequency carrier signal energy.
12. the method for digital signal frequency discrimination according to claim 11 is characterized in that, described default frequency deviation is to make described digital signal frequency discriminator work in the frequency deviation of the linear zone of described frequency discrimination indicatrix.
13. the method for digital signal frequency discrimination according to claim 10 is characterized in that:
Describedly add default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment produces, obtain forward off frequency carrier signal, the input intermediate-freuqncy signal of forward off frequency carrier signal and the input of input intermediate frequency equipment is done correlation intergal, the step of obtaining the energy of forward off frequency carrier signal comprises: the first multiplier adds default frequency deviation on described local intercarrier signal, obtains forward off frequency carrier signal; First integrator is obtained the energy of described forward off frequency carrier signal by correlation intergal;
Describedly subtract default frequency deviation on the local intermediate-freuqncy signal that local carrier equipment produces, obtain negative sense off frequency carrier signal, the input intermediate-freuqncy signal of negative sense off frequency carrier signal and the input of input intermediate frequency equipment is done correlation intergal, the step of obtaining the energy of negative sense off frequency carrier signal comprises: the second multiplier subtracts described default frequency deviation on the local intermediate-freuqncy signal that described local carrier equipment produces, obtain negative sense off frequency carrier signal; The second integral device obtains the energy of described negative sense off frequency carrier signal by correlation intergal.
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| JPH0818404A (en) * | 1994-06-28 | 1996-01-19 | Kokusai Electric Co Ltd | Automatic frequency control system for millimeter wave band fm transmitter-receiver |
| JP2003219311A (en) * | 2002-01-18 | 2003-07-31 | Kenwood Corp | Digital television broadcast receiver |
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|---|---|---|---|---|
| US4150338A (en) * | 1977-03-28 | 1979-04-17 | Rca Corporation | Frequency discriminators |
| CN101727566A (en) * | 2008-10-31 | 2010-06-09 | 佛山市顺德区汉达精密电子科技有限公司 | Radio frequency identifier reading device with antennas at different angles |
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