CN102739575A - Carrier capturing method in large dynamic range - Google Patents
Carrier capturing method in large dynamic range Download PDFInfo
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- CN102739575A CN102739575A CN2012102227985A CN201210222798A CN102739575A CN 102739575 A CN102739575 A CN 102739575A CN 2012102227985 A CN2012102227985 A CN 2012102227985A CN 201210222798 A CN201210222798 A CN 201210222798A CN 102739575 A CN102739575 A CN 102739575A
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Abstract
The invention discloses a carrier capturing method in a large dynamic range. The method is used for capturing uplink carrier signals on a spacecraft. The method comprises the following steps of: carrying out down conversion on received uplink carrier signals by using local carrier at a fixed frequency interval; filtering to obtain intermediate-frequency signals after down conversion; extracting the intermediate-frequency signals by using three sampling frequencies to obtain a high-speed extraction signal, an intermediate-speed extraction signal and a low-speed extraction signal; judging the peak values of the high-speed extraction signal, the intermediate-speed extraction signal and the low-speed extraction signal respectively, capturing the uplink carrier signals, and carrying out capture confirmation on the captured uplink carrier signals to obtain confirmed uplink carrier signals; and acquiring and outputting the carrier frequency and carrier power of the confirmed uplink carrier signals. By the method, single carrier can be captured at extremely low signal-to-noise ratio, and large frequency change range and high frequency change rate are adapted.
Description
Technical field
The present invention relates to a kind of great dynamic range method for capturing carrier.
Background technology
The signalc threshold disposal ability signal to noise ratio C/N0 of method for capturing carrier of the prior art answering machine on the moon soccer star CE-1/2 that has flown is 47dBHz; And in survey of deep space; The signal to noise ratio dynamic range that receives signal is very big, and C/N0 is from 17dBHz to 117dBHz.In order to adapt to the survey of deep space needs, method for capturing carrier adapts to the requirement that survey of deep space signal Doppler spread is big, Doppler-shift speed is high simultaneously.In the former survey of deep space task, treatment facility is waiting for ground signal with the frequency of ground station agreement on the star, in survey of deep space, needs on-board equipment initiatively in Doppler spread, to seek signal to save time.
The capturing carrier algorithm will adapt to that high dynamic power changes, frequency range and high-frequency rate of change are also initiatively sought signal to save time greatly; Adopt traditional spectrum method of estimation can not adapt to the high-frequency rate of change and initiatively seek signal; So must catch high dynamic power range classification, big frequency range is divided into a plurality ofly carry out analysis of spectrum among a small circle, and preset a plurality of swept-frequency signals to adapt to the high-frequency transformation rate in this locality.
" BPSK-PM deep space communication signal carrier Acquisition Scheme " introduced the method for capturing carrier that frequency search is carried out in a kind of FFT of employing computing." a kind of design of high dynamic USB answering machine and realization " introduced the method that realizes capturing carrier in a kind of high dynamic environment.Method for capturing carrier in the above-mentioned document all is to handling than great dynamic range, not proposing how to handle high frequency sweep frequency speed and equipment and initiatively seek signal to save capture time, so be difficult to adapt to the demand of deep space telemetry communication.
Summary of the invention
Technology of the present invention is dealt with problems and is: to the deficiency of prior art, a kind of great dynamic range method for capturing carrier is provided, has realized under utmost point low signal-to-noise ratio the catching of single carrier, and can adapt to big frequency range and high-frequency rate of change.
Technical solution of the present invention is:
A kind of great dynamic range method for capturing carrier is used on spacecraft realizing the catching of up-link carrier signal may further comprise the steps:
Adopt fixed frequency local carrier at interval that the up-link carrier signal that receives is carried out down-conversion;
Filtering obtains the intermediate-freuqncy signal after the down-conversion;
Adopt three sampling frequencys that said intermediate-freuqncy signal is extracted and obtain to extract at a high speed signal, middling speed extraction signal, low speed extraction signal;
Respectively the peak value that extracts signal, middling speed extraction signal, low speed extraction signal is at a high speed judged, said up-link carrier signal is caught, and the up-link carrier signal after catching is caught affirmation once more, the up-link carrier signal after obtaining to confirm;
Obtain carrier frequency and carrier power and the output of confirming the said up-link carrier signal in back.
Further, adopt N up-link carrier signal to carry out frequency sweep acquisition intermediate-freuqncy signal to receiving with fixed frequency local carrier at interval.
Further, to said three the tunnel extract signals adopt two-forties extract signals be superior in speed extract signal and be superior to order that low rate extracts signal and carry out peak value and judge.
The present invention compared with prior art has following advantage:
The present invention is through using high, normal, basic three kinds of acquisition modes respectively to high, normal, basic signal-noise ratio signal, satisfied the requirement of capture ability under requirement and the low signal-to-noise ratio of capture time under the high s/n ratio; Through using the secondary confirmation method of capturing carrier, further improved catching precision and having eliminated Doppler under the high s/n ratio and changed the influence that low signal-to-noise ratio is caught, and sought signal through segmentation and saved capture time; Eliminated of the influence of Doppler's sweep rate through the method that adopts this locality to preset sweep rate to capturing carrier.
Description of drawings
Fig. 1 is a flow chart of the present invention;
Fig. 2 is for catching flow chart;
Fig. 3 is the accumulative total design sketch.
Embodiment
Just combine accompanying drawing that the present invention is done further introduction below.
Be illustrated in figure 1 as flow chart of the present invention; Adopt this method; After at first up carrier signal being carried out the AD data sampling on the spacecraft, the sampled signal that obtains is carried out Digital Down Convert; Afterwards the middle frequency variation signal that obtains is carried out LPF, and the intermediate-freuqncy signal of utilizing local sampling frequency that filtering is obtained extracts the speed that reduces intermediate-freuqncy signal, at last the analysis of spectrum that carries out of picked up signal is accomplished with search and caught.
In said process, (signal frequency 7 is to 8GHz, lowest signal-to-noise-17dBm for the up-link carrier signal that is sent by ground; Sweep rate 0 to 20Hz/s; The positive and negative 36KHz of swept frequency range), therefore after the AD sampling of accomplishing carrier signal, adopt N local carrier that sampled signal is carried out down-conversion.The frequency sweep of the employing fixed frequency band different rates of N local carrier signal, the difference of sweep rate and upward signal sweep rate satisfies the requirement of track loop accommodation.In the practical application owing to require to catch the back deviation in 10Hz/s, so the local sweep rate that presets carrier wave select for use respectively+15Hz/s, thereby 0Hz/s reduces to sweep rate in the 10Hz/s to the influence of capturing carrier with-15Hz/s.Adopt these three to preset carrier wave sampled signal is carried out the signal after down-conversion obtains three tunnel down-conversions.
Signal after adopting low pass filter to three tunnel down-conversions carries out filtering, can leach the intermediate-freuqncy signal in three road down-conversion signals through low pass filter.Intermediate-freuqncy signal to obtaining extracts, and extracts the same sampling frequency that adopts three different rates, and three sampling frequencys are chosen 1M, 125K, 8K respectively.Frequency through extracting intermediate-freuqncy signal reduces, thereby produces three-way output signal equally, adapt to respectively high s/n ratio, middle high s/n ratio and low high s/n ratio under catch.
In order to satisfy the requirement of catching under the low signal-to-noise ratio, add up for three tunnel extraction signals that obtain,
Repeatedly accumulation under the low level: for adapting to big Doppler's excursion and initiatively seeking signal; Need whole Doppler's excursion be divided into a plurality of little intervals analyzes; Then peak value is compared; About 16 accumulations are done in each interval of analyzing, just can be drawn its signal peak, then peak value is compared.The place at peak-peak place is exactly the frequency of upward signal.
Extract the peak value that three tunnel after adding up extracts signals, utilize the peak value of three tunnel extraction signals to confirm once to catch,
The capturing carrier algorithm at first under the high s/n ratio acquisition mode, to one group of continuous data in the memory module, carries out the FFT computing, obtains signal peak.If peak value greater than predetermined threshold value, then gets into the high s/n ratio affirmation mode.
Acquisition procedure is as shown in Figure 2, if the peak value that the high s/n ratio acquisition mode calculates, then switches to middle signal to noise ratio acquisition mode less than preset thresholding.Analysis of spectrum is carried out in each section interval to being divided, obtains signal peak.If peak value is arranged greater than predetermined threshold value, signal to noise ratio affirmation mode in then getting into.
If do not have peak value greater than predetermined threshold value under the middle signal to noise ratio acquisition mode, then switch to the low signal-to-noise ratio acquisition mode.Analysis of spectrum is carried out in one section interval to being divided, and in order to satisfy the requirement of catching under the ultralow signal to noise ratio, need do about 16 accumulations to the interval utilization period map method of being analyzed, and draws its signal peak.Fig. 3 is that the effect that accumulation back carrier wave spectrum is estimated compares.If the signal peak after the accumulation then changes the low signal-to-noise ratio affirmation mode over to greater than predetermined threshold value, if less than predetermined threshold value; Then get into the high s/n ratio acquisition mode again; Repeat aforesaid operations, when getting into the low signal-to-noise ratio acquisition mode once more, analysis of spectrum is carried out in the interval that switches to next section division.
After completion is caught, the upward signal frequency spectrum is carried out secondary confirm.
The secondary of signal spectrum is confirmed: more rough through doing the spectrum estimation that 1024 FFT carry out for the first time because the dynamic range of upward signal is very big, for high s/n ratio, the error range estimated of spectrum is 1kHz for the first time, and middle signal to noise ratio is 150Hz.Thereby, the 1KHz error range of high level is dropped to 150Hz so need utilize the sample rate of 150KHz to carry out the precision that secondary confirm to improve capturing carrier again.If signal acquisition success under low signal-to-noise ratio; Because Doppler's influence; The scope of each analysis of spectrum is very little under the low signal-to-noise ratio pattern, is merely 2KHz and in the processing time, can run out of analyst coverage first in order to guarantee carrier wave, also need carry out the low signal-to-noise ratio secondary to it and confirm.Difference according to twice analysis of spectrum signal peak value point can also calculate the difference on the frequency of signal in the time period of twice analysis simultaneously, thereby obtains the sweep rate of upward signal.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (3)
1. great dynamic range method for capturing carrier is used on spacecraft, realizing the catching of up-link carrier signal is characterized in that may further comprise the steps:
Adopt fixed frequency local carrier at interval that the up-link carrier signal that receives is carried out down-conversion;
Filtering obtains the intermediate-freuqncy signal after the down-conversion;
Adopt three sampling frequencys that said intermediate-freuqncy signal is extracted and obtain to extract at a high speed signal, middling speed extraction signal, low speed extraction signal;
Respectively the peak value that extracts signal, middling speed extraction signal, low speed extraction signal is at a high speed judged, said up-link carrier signal is caught, and the up-link carrier signal after catching is caught affirmation once more, the up-link carrier signal after obtaining to confirm;
Obtain carrier frequency and carrier power and the output of confirming the said up-link carrier signal in back.
2. a kind of great dynamic range method for capturing carrier as claimed in claim 1 is characterized in that: adopt N the up-link carrier signal to receiving with fixed frequency local carrier at interval to carry out frequency sweep acquisition intermediate-freuqncy signal.
3. a kind of great dynamic range method for capturing carrier as claimed in claim 1 is characterized in that: to said three the tunnel extract signals adopt two-forties extract signals be superior in speed extract signal and be superior to order that low rate extracts signal and carry out peak value and judge.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356954A (en) * | 2015-12-09 | 2016-02-24 | 西安星通通信科技有限公司 | Method and system for detecting chirp signal power |
| CN107689813A (en) * | 2016-08-04 | 2018-02-13 | 北京遥感设备研究所 | A kind of burst type MSK direct sequence signal quick capturing method |
| CN108988929A (en) * | 2018-05-28 | 2018-12-11 | 江苏辰科慧芯电子科技有限公司 | A kind of superelevation dynamic satellite navigation communication device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101184297A (en) * | 2007-11-19 | 2008-05-21 | 华为技术有限公司 | Dual-mode transceiver and dual-mode signal processing method |
| CN101286758A (en) * | 2008-04-23 | 2008-10-15 | 华为技术有限公司 | Method and apparatus to determine delay of uplink channel |
-
2012
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101184297A (en) * | 2007-11-19 | 2008-05-21 | 华为技术有限公司 | Dual-mode transceiver and dual-mode signal processing method |
| CN101286758A (en) * | 2008-04-23 | 2008-10-15 | 华为技术有限公司 | Method and apparatus to determine delay of uplink channel |
Non-Patent Citations (1)
| Title |
|---|
| 潘高峰，崔庆华，丛波: "《S频段通用应答机的设计与应用》", 《电视技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356954A (en) * | 2015-12-09 | 2016-02-24 | 西安星通通信科技有限公司 | Method and system for detecting chirp signal power |
| CN107689813A (en) * | 2016-08-04 | 2018-02-13 | 北京遥感设备研究所 | A kind of burst type MSK direct sequence signal quick capturing method |
| CN107689813B (en) * | 2016-08-04 | 2019-08-23 | 北京遥感设备研究所 | A kind of burst type minimum frequency shift keying direct sequence signal quick capturing method |
| CN108988929A (en) * | 2018-05-28 | 2018-12-11 | 江苏辰科慧芯电子科技有限公司 | A kind of superelevation dynamic satellite navigation communication device |
| CN108988929B (en) * | 2018-05-28 | 2021-02-26 | 江苏辰科慧芯电子科技有限公司 | Ultrahigh dynamic satellite navigation communication device |
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