CN109714047A - A method of realizing the frequency locking track loop gain of simple Larger Dynamic - Google Patents
A method of realizing the frequency locking track loop gain of simple Larger Dynamic Download PDFInfo
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- CN109714047A CN109714047A CN201811541946.3A CN201811541946A CN109714047A CN 109714047 A CN109714047 A CN 109714047A CN 201811541946 A CN201811541946 A CN 201811541946A CN 109714047 A CN109714047 A CN 109714047A
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Abstract
A method of realizing the frequency locking track loop gain of simple Larger Dynamic, the following steps are included: the digital medium-frequency signal of input is mixed respectively with the SIN/COS signal that NCO is generated, the orthogonal road I signal and the road Q signal are formed, in order to filter out high fdrequency component, carries out low-pass filtering；The complexity of subsequent processing is reduced by carrying out down-sampling to low-pass filtering data；Frequency discrimination pretreatment includes anti-aliasing filter, down-sampling, frequency discrimination filtering, it is therefore intended that filters out subcarrier signal, tracking restores carrier frequency；Frequency discrimination uses difference-product frequency discrimination algorithm；The output valve of frequency discrimination is made decisions, when the value is greater than 0, judgement output valve is k, and when the value is less than 0, judgement output valve is-k, and otherwise adjudicating output valve is 0；Wherein k is fixed constant, can parameter configuration.
Description
Technical field
The present invention relates to a kind of frequency locking track loop for realizing simple Larger Dynamic, be applied to including satellite TT&C,
The fields such as satellite navigation, mobile communication, versatility is high, and adaptation input range range is wide, especially suitable for Aerospace Tracking & Control.
Background technique
Important component of the TT&C Transponder as tracking-telemetry and command subsystem, it provides double between satellite and TT&C Earth Station
To RF transmission channel, TT&C Earth Station is cooperated to complete the tasks such as tracking, measurement, remote control, telemetering to satellite jointly, generally by
A few big unit compositions such as radio-frequency channel and signal processing base band, and signal processing base band is the core of TT&C Transponder.
Signal processing base band mainly realizes the function such as the acquisition and tracking of carrier wave, remote control demodulation, measurement demodulation and telemetering modulation
Can, frequency locking ring is since capture zone is roomy, the characteristic of fast convergence rate is generally used to carry out the first step of capturing carrier tracking.Due to
The baseband intermediate frequency entrance reference signal amplitude that different TT&C Transponders are penetrated is variant, and changes with the variation of input signal,
Its signal power variations range is more than 20dB when normal work, therefore it is required that signal processing base band can adapt to the base of different capacity
Band IF input signals, that is, require frequency locking ring track loop to have Larger Dynamic adaptability.
The frequency discrimination value of conventional frequency locking tracking ring is related to input signal power, is difficult in the case where fixing one group of frequency locking ring parameter
Cover high-power range；Improved frequency locking tracking ring generally uses arc tangent frequency discrimination, needs to apply division and arctangent cp cp operation,
Difficulty is larger when Implementation of Embedded System.Therefore need to design it is a kind of not only realized it is simple have again the frequency locking of Larger Dynamic ability with
Track loop.
Summary of the invention
Adapt to the baseband intermediate frequency input signal of different amplitudes.It is proposed a kind of frequency locking tracking ring for realizing simple Larger Dynamic
Road can adapt to the IF input signals of varying strength, effectively increase the dynamically adapting ability of frequency-locked loop.
A method of realizing the frequency locking track loop gain of simple Larger Dynamic, comprising the following steps: the number of input
Intermediate-freuqncy signal is mixed respectively with the SIN/COS signal that NCO is generated, and the orthogonal road I signal and the road Q signal is formed, in order to filter
Except high fdrequency component, low-pass filtering is carried out；The complexity of subsequent processing is reduced by carrying out down-sampling to low-pass filtering data；Mirror
Frequency pretreatment includes anti-aliasing filter, down-sampling, frequency discrimination filtering, it is therefore intended that filters out subcarrier signal, tracking restores carrier frequency
Rate；Frequency discrimination uses difference-product frequency discrimination algorithm；The output valve of frequency discrimination is made decisions, when the value is greater than 0, judgement output valve is k, when
When the value is less than 0, judgement output valve is-k, and otherwise adjudicating output valve is 0；Wherein k is fixed constant, can parameter configuration.
The method for obtaining frequency-locked loop gain according to the symbol of frequency discrimination output error value, it is characterised in that the following:
1, frequency locking ring frequency discrimination output error value symbol is taken to adjust frequency-locked loop multiplied by fixed gain；
2, used fixed gain can guarantee that loop is not spilt over when inputting the intermediate-freuqncy signal of amplitude peak, that is, is adapted to not
With the input signal of intensity.
The advantages of the present invention over the prior art are that: the present invention is only obtained according to the symbol of frequency discrimination output error value
Frequency-locked loop gain.General frequency-locked loop is in real time adjusted loop using frequency discrimination output error value, since frequency discrimination exports
Error amount is related with input signal amplitude, therefore the adaptable base band input intermediate-freuqncy signal range of institute is relatively narrow, using in the present invention
Method after, can adapt to the IF input signals of varying strength, effectively increase the dynamically adapting ability of frequency-locked loop.
Detailed description of the invention
Fig. 1 is that a kind of method of frequency locking ring track loop gain for realizing simple Larger Dynamic realizes block diagram.
Specific embodiment
Invention is further described in conjunction with attached drawing and example.
Fig. 1 is that a kind of method for the frequency locking ring track loop gain for realizing simple Larger Dynamic of the present invention realizes block diagram,
In include: mixing 0, low-pass filtering 1, down-sampling 2, anti-aliasing filter 3, down-sampling 4, frequency discrimination filter 5, frequency discrimination 6, loop gain control
Make 7, loop filtering 8, NCO9.
1, it as shown in Figure 1, the digital medium-frequency signal of input is mixed respectively with the SIN/COS signal that NCO is generated, is formed
The orthogonal road I signal and the road Q signal carries out low-pass filtering, it is as follows to commonly enter signal to filter out high fdrequency component:
Wherein, A (n) is input signal amplitude, and ω is input IF carrier angular frequency, fbsFor if sampling rate,For
Phase.
I, Q two paths of signals are respectively as follows: after mixing low-pass filtering
Wherein Δ ω is frequency difference.
2, it is the complexity and difficulty that reduce subsequent processing, need to be reduced by carrying out down-sampling to low-pass filtering data
The complexity of subsequent processing.Down-sampling multiple must assure that in frequency domain aliasing will not occur for data.
3, frequency discrimination pretreatment includes anti-aliasing filter, down-sampling, frequency discrimination filtering, it is therefore intended that subcarrier signal is filtered out, with
Track restores carrier frequency.Anti-aliasing filter is mainly used for carrying out limit tape handling to the signal before down-sampling, sends out after preventing down-sampling
Raw spectral aliasing, generally completes this function using FIR low-pass filtering, and filtering bandwidth is related with down-sampling multiple.Under adopt
Sample multiple size is related to frequency overlapped-resistable filter and discriminator filter designs.Down-sampling multiple is higher, anti-alias filter bandwidth
Narrower, it is higher that FIR filter designs order, and discriminator filter design order is lower；Down-sampling multiple is lower, anti-aliasing filter
Device bandwidth is wider, and it is lower that FIR filter designs order, and discriminator filter design order is higher.Discriminator filter is for filtering out
Subcarrier signal filters out difference frequency information and is sent into frequency discriminator block.
4, frequency discrimination uses difference-product frequency discrimination algorithm, and implementation complexity is minimum, and frequency discrimination output error value is as follows:
Wherein f "bsFor the loop sampling rate after down-sampling.
It can be seen that frequency discrimination output error value and incoming signal level power, the intermediate frequency of general TT&C Transponder inputs letter
Number level power range at least needs covering -20dBm~3dBm, then frequency discrimination output error value variation range is at least 23dB.Lock
Frequency loop can not adapt to so big dynamic range.
5, the output valve of frequency discrimination is made decisions, when the value is greater than 0, judgement output valve is that k sentences when the value is less than 0
Certainly output valve is-k, and otherwise adjudicating output valve is 0.Wherein k is fixed constant, can parameter configuration.
6, the function of loop filter is filtered to the error signal of frequency discrimination output, inhibits noise and high fdrequency component,
It is mainly determined that being suitably designed filter parameter can be improved loop to high dynamic to dynamic response by its order and loop bandwidth
The adaptability of state environment.In view of there are certain doppler changing rates for general TT&C system, two type ring of second order is selected here.
7, NCO is realized using look-up table DDS, in order to save register resources, using 1/4 sine table.
The content that description in the present invention is not described in detail belongs to the well-known technique of professional and technical personnel in the field.
Claims (6)
1. a kind of method for the frequency locking track loop gain for realizing simple Larger Dynamic, which comprises the following steps:
The digital medium-frequency signal of input is mixed respectively with the SIN/COS signal that NCO is generated, and forms the orthogonal road I signal and Q
Road signal carries out low-pass filtering to filter out high fdrequency component；
The complexity of subsequent processing is reduced by carrying out down-sampling to low-pass filtering data；
Frequency discrimination pretreatment includes anti-aliasing filter, down-sampling, frequency discrimination filtering, it is therefore intended that filters out subcarrier signal, tracking restores
Carrier frequency；
Frequency discrimination uses difference-product frequency discrimination algorithm；
The output valve of frequency discrimination is made decisions, when the value is greater than 0, judgement output valve is k, when the value is less than 0, judgement output
Value is-k, and otherwise adjudicating output valve is 0；Wherein k is fixed constant, can parameter configuration.
2. a kind of method for the frequency locking track loop gain for realizing simple Larger Dynamic as described in claim 1, feature exist
In:
The low-pass filtering, input signal are as follows:
Wherein, A (n) is input signal amplitude, and ω is input IF carrier angular frequency, fbsFor if sampling rate,For phase；
I, Q two paths of signals are respectively as follows: after mixing low-pass filtering
Wherein Δ ω is frequency difference.
3. a kind of method for the frequency locking track loop gain for realizing simple Larger Dynamic as described in claim 1, feature exist
In: in frequency domain aliasing will not occur for down-sampling multiple data.
4. a kind of method for the frequency locking track loop gain for realizing simple Larger Dynamic as described in claim 1, feature exist
In: anti-aliasing filter completes this function using FIR low-pass filtering, and filtering bandwidth is related with down-sampling multiple.
5. a kind of method for the frequency locking track loop gain for realizing simple Larger Dynamic as described in claim 1, feature exist
In: frequency discrimination output error value is as follows:
Wherein f "bsFor the loop sampling rate after down-sampling.
6. a kind of method for the frequency locking track loop gain for realizing simple Larger Dynamic as described in claim 1, feature exist
In: it is filtered using the error signal that two type ring loop filter of second order exports frequency discrimination, inhibits noise and high fdrequency component.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115459760A (en) * | 2022-11-09 | 2022-12-09 | 青岛泰戈菲斯海洋装备股份公司 | Frequency discrimination circuit of acoustic releaser |
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| US5828705A (en) * | 1996-02-01 | 1998-10-27 | Kroeger; Brian W. | Carrier tracking technique and apparatus having automatic flywheel/tracking/reacquisition control and extended signal to noise ratio |
| CN104199063A (en) * | 2014-08-20 | 2014-12-10 | 北京遥测技术研究所 | Blind frequency detector processing method based on cross product algorithm |
| CN107070832A (en) * | 2016-12-22 | 2017-08-18 | 中国电子科技集团公司第三十研究所 | A kind of high dynamic UAV TT ＆ C signal carrier tracking method |
| CN107888187A (en) * | 2017-10-17 | 2018-04-06 | 上海航天电子有限公司 | The Larger Dynamic frequency locking track loop judged based on energy |
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2018
- 2018-12-17 CN CN201811541946.3A patent/CN109714047A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5828705A (en) * | 1996-02-01 | 1998-10-27 | Kroeger; Brian W. | Carrier tracking technique and apparatus having automatic flywheel/tracking/reacquisition control and extended signal to noise ratio |
| CN104199063A (en) * | 2014-08-20 | 2014-12-10 | 北京遥测技术研究所 | Blind frequency detector processing method based on cross product algorithm |
| CN107070832A (en) * | 2016-12-22 | 2017-08-18 | 中国电子科技集团公司第三十研究所 | A kind of high dynamic UAV TT ＆ C signal carrier tracking method |
| CN107888187A (en) * | 2017-10-17 | 2018-04-06 | 上海航天电子有限公司 | The Larger Dynamic frequency locking track loop judged based on energy |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115459760A (en) * | 2022-11-09 | 2022-12-09 | 青岛泰戈菲斯海洋装备股份公司 | Frequency discrimination circuit of acoustic releaser |
| CN115459760B (en) * | 2022-11-09 | 2023-03-03 | 青岛泰戈菲斯海洋装备股份公司 | Frequency discrimination circuit of acoustic releaser |
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