CN102508271A - Navigation satellite signal capturing method based on peak value location comparison - Google Patents
Navigation satellite signal capturing method based on peak value location comparison Download PDFInfo
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- CN102508271A CN102508271A CN2011102926913A CN201110292691A CN102508271A CN 102508271 A CN102508271 A CN 102508271A CN 2011102926913 A CN2011102926913 A CN 2011102926913A CN 201110292691 A CN201110292691 A CN 201110292691A CN 102508271 A CN102508271 A CN 102508271A
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Abstract
The invention provides a navigation satellite signal capturing method based on peak value location comparison, relating to a navigation satellite signal capturing method and solving the problems that the conventional navigation satellite signal capturing method has lower detection probability of small correlating peak values in a weak signal condition and the system has high false-alarm rate. The method comprises the following steps of: carrying out correlation calculation on a signal for many times, searching for the maximum value after each correlation calculation, and recording the position of the maximum value; judging if the signal exists according to the position of the maximum value when the positions of the maximum values are enough recorded, and then determining if the navigation satellite signal capture is successful. The method provided by the invention is suitable for capturing the navigation satellite signal.
Description
Technical field
The present invention relates to a kind of capturing navigation satellite signal method.
Background technology
The work of catching of navigation satellite signal can be considered to be at the two-dimensional search that carries out on frequency and two dimensions of code phase, in search, whole hunting zone is divided into a plurality of unit and searches for and adjudicate.What the mode decision scheme that is adopted in traditional capturing navigation satellite signal circuit adopted is the strategy of getting M among Tang's search and the N.The workflow of Tang's search is as shown in Figure 1.
Threshold value A and the initial value B of Tang's search through reasonably choosing K realizes the balance between search speed, verification and measurement ratio and the false alarm rate.Confirm that to being difficult to the unit whether signal exists appends more search time, and the unit that surpasses thresholding is repeatedly adjudicated to reduce false-alarm.
Wherein there be M time above thresholding if the strategy of getting M among the N all carries out N search to each search unit, then think acquisition success.
Two kinds of search patterns all are through the mode of repeated detection uncertain search unit to be carried out repeat search, simultaneously also are that the mode through repeated detection reduces false-alarm.But under weak signal, detected correlation peak may be smaller in the search unit, though each detected correlation peak can not surpass thresholding, exist really, and these two kinds traditional judgement means can't be utilized this part energy.If the selection of threshold value is unreasonable in design simultaneously, can cause the maximal value of some noises also to surpass thresholding, bring false-alarm to system, or system pays extra cost.
Summary of the invention
The present invention is lower to the detection probability of correlation peak less under the weak signal in order to solve existing capturing navigation satellite signal method, causes the high problem of system's false alarm rate, thereby provides a kind of based on peak capturing navigation satellite signal method relatively.
Based on peak capturing navigation satellite signal method relatively, it is realized by following steps:
Step 2, navigation satellite signal and local code that step 1 is received carry out related operation, obtain one group of related function;
Step 3, the related function that step 2 is obtained carry out peak value searching, the position of record peak value;
Step 4, repeating step one arrive step 3 k time, obtain a corresponding k peak, and K is the positive integer more than or equal to 2;
Step 5, all k peak is compared, obtain comparative result;
Step 6, judge that whether comparative result satisfies the Changing Pattern of expection, if judged result is for being that then decision signal exists, the completion capturing navigation satellite signal; If judged result is that then decision signal does not exist, and returns step 1, and navigation satellite signal is received next time.
Expection Changing Pattern described in the step 6 was confirmed according to the time interval between sign indicating number Doppler size and per twice related operation.
Beneficial effect: (it is high especially to be lower than-128dBm) to descend the detection probability of less correlation peak, and system's false alarm rate reduces significantly to weak signal for capturing navigation satellite signal method of the present invention.
Description of drawings
Fig. 1 is the workflow synoptic diagram of the search of Tang described in the background technology; Fig. 2 is the schematic flow sheet of method of the present invention.Fig. 3 is the central control state machine prize judgment strategic process figure in the embodiment one.
Embodiment
Embodiment one, combination Fig. 1 explain this embodiment, and based on peak capturing navigation satellite signal method relatively, it is realized by following steps:
Step 2, navigation satellite signal and local code that step 1 is received carry out related operation, obtain one group of related function;
Step 3, the related function that step 2 is obtained carry out peak value searching, the position of record peak value;
Step 4, repeating step one arrive step 3 k time, obtain a corresponding k peak, and K is the positive integer more than or equal to 2;
Step 5, all k peak is compared, obtain comparative result;
Step 6, judge that whether comparative result satisfies the Changing Pattern of expection, if judged result is for being that then decision signal exists, the completion capturing navigation satellite signal; If judged result is that then decision signal does not exist, and returns step 1, and navigation satellite signal is received next time.
Expection Changing Pattern described in the step 6 is confirmed according to the factors such as the time interval between sign indicating number Doppler size and per twice related operation.
Principle: must comprise a maximal value among the result of each related operation, this maximal value might be the correlativity generation by signal, also possibly be the maximal value in the noise.The maximal value that is produced by noise can be along with signal intensity, perhaps the change of receiver accumulated time and changing.For the peak value that is obtained by signal correlation, the position should be constant, or gradual owing to the sign indicating number Doppler effect.And for the peak value in the noise, its position is a random variation.Utilize this point, can be by the peak that obtains after repeatedly adjudicating, whether analysis draws signal and exists.
In the middle of peak mode decision scheme relatively, remain and will carry out repeatedly related operation signal, all to carry out peaked search after each related operation, and note the position that maximal value occurs.After having write down abundant maximum value position, concern through peaked position and to judge having or not of signal.
If the related function that the computing of k correlations is obtained is designated as C with the form of array
k, each element wherein, promptly the correlation on each code phase is designated as a
Kx, the value of x is from the 1 total sampling number n to system here.
C
k＝[a
k1?a
k2?a
k3…a
kn]
In every group of related function, must there be a maximal value a
Max, its position in sequence is designated as b,
a
max＝max(C)＝a
b
System carries out can obtaining m group related function sequence after the computing of m correlations, and constitutes the related function matrix M of the capable n row of m.
Note the maximum value position b of every row in the matrix M
y, the value of y constitutes the vectorial P of reaction peak, element b among the P from 1 to m here
1To b
mBut between just having or not of reflected signal of relation.
P＝[b
1?b
2?b
3…b
m]
For example, under the situation that does not have Doppler shift, the maximum value position that at every turn searches should be fixed, or receives the influence of system clock source degree of stability, floats within the specific limits.And under the situation that Doppler shift is arranged, the maximum value position that at every turn searches should be gradual according to certain rule, and its Changing Pattern can be according to being stipulated by the factors such as the time interval between sign indicating number Doppler size, per twice related operation.When maximum value position did not satisfy the Changing Pattern of expection, then decision signal did not exist.
The mode decision scheme of peak comparison both can use separately, also can be used in combination with other strategies.Such as setting a threshold value maximal value is screened, get rid of that those are too small, to such an extent as to can not be the maximal value of relevant peaks.Also can with its with N in get M strategy combine, if there be M peaked position to satisfy the rule change of expection in the maximal value that the N correlations obtains, then be regarded as signal and exist.
Below through concrete experimental verification effect of the present invention, adjudicating with twice contrast maximum value position and method that threshold value is set is example.Based on FPGA system is realized in the experiment, use Agilent 4438C signal generator as signal source.
In the experiment, be judgment variables, carry out 1000 times and catch, and note is caught result and pre-conditioned consistent number of times, the number of times of catching result and the pre-conditioned number of times that is not inconsistent and failing to catch with the peak value and the likening to of average of gained related function.Test case is as shown in table 1.
Table 1 hardware testing result
From experimental result, can find out; Consider transmission line and splicing loss, system sensitivity reached-145～-146dBm, according to the conventional method; Threshold value is set to 0 o'clock system and can't works; But owing to introduced maximum value position mode decision scheme relatively, native system still can be worked, and catches more weak signal.
Below through concrete embodiment the course of work of the present invention is described: the C/A sign indicating number sequence capturing process with GPS L1 frequency range is an example, adopts peak-to-average force ratio as judgment variables, and the mode of thresholding and twice code phase comparison of crossing through twice is adjudicated.Detailed process such as Fig. 3 show.System is when the enterprising line search of a certain frequency groove; When the peak-to-average force ratio of related function during greater than the peak-to-average force ratio thresholding that sets; System can write down the phase value of being caught, and on this frequency groove, once catches once more, if the peak-to-average force ratio of the correlation that obtains still surpasses thresholding; And catch the phase value that resulting code phase and front writes down and differ and be no more than half-chip, then think changing frequently acquisition success on the groove.In this judging process,, just be judged as this frequency groove and catch failure if there is any one condition not satisfy.
Claims (2)
1. based on peak capturing navigation satellite signal method relatively, it is characterized in that: it is realized by following steps:
Step 1, reception navigation satellite signal;
Step 2, navigation satellite signal and local code that step 1 is received carry out related operation, obtain one group of related function;
Step 3, the related function that step 2 is obtained carry out peak value searching, the position of record peak value;
Step 4, repeating step one arrive step 3 k time, obtain a corresponding k peak, and K is the positive integer more than or equal to 2;
Step 5, all k peak is compared, obtain comparative result;
Step 6, judge that whether comparative result satisfies the Changing Pattern of expection, if judged result is for being that then decision signal exists, the completion capturing navigation satellite signal; If judged result is that then decision signal does not exist, and returns step 1, and navigation satellite signal is received next time.
2. according to claim 1 based on peak capturing navigation satellite signal method relatively, it is characterized in that the expection Changing Pattern described in the step 6 is definite according to the time interval between sign indicating number Doppler size and per twice related operation.
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Cited By (5)
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| CN105277294A (en) * | 2015-11-16 | 2016-01-27 | 北京华朔物联网科技有限公司 | Anti-interference method for frequency division multiplexing label based on Internet of Things electric power temperature measurement equipment |
| CN107015253A (en) * | 2017-03-09 | 2017-08-04 | 沈阳理工大学 | In a kind of navigation neceiver can dynamic threats prediction searching and detecting method |
| CN109001772A (en) * | 2018-06-12 | 2018-12-14 | 桂林电子科技大学 | The Beidou navigation signal acquiring method compared based on peak position |
| CN113109846A (en) * | 2021-03-04 | 2021-07-13 | 北京北方联星科技有限公司 | Capture verification strategy method based on signal intensity trend |
| CN113872909A (en) * | 2021-09-28 | 2021-12-31 | 东方红卫星移动通信有限公司 | Low-earth-orbit satellite Internet of things short-time burst carrier capturing method and system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105277294A (en) * | 2015-11-16 | 2016-01-27 | 北京华朔物联网科技有限公司 | Anti-interference method for frequency division multiplexing label based on Internet of Things electric power temperature measurement equipment |
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| CN107015253A (en) * | 2017-03-09 | 2017-08-04 | 沈阳理工大学 | In a kind of navigation neceiver can dynamic threats prediction searching and detecting method |
| CN107015253B (en) * | 2017-03-09 | 2021-06-18 | 沈阳理工大学 | Search detection method capable of dynamically predicting threat in navigation receiver |
| CN109001772A (en) * | 2018-06-12 | 2018-12-14 | 桂林电子科技大学 | The Beidou navigation signal acquiring method compared based on peak position |
| CN113109846A (en) * | 2021-03-04 | 2021-07-13 | 北京北方联星科技有限公司 | Capture verification strategy method based on signal intensity trend |
| CN113872909A (en) * | 2021-09-28 | 2021-12-31 | 东方红卫星移动通信有限公司 | Low-earth-orbit satellite Internet of things short-time burst carrier capturing method and system |
| CN113872909B (en) * | 2021-09-28 | 2023-09-01 | 东方红卫星移动通信有限公司 | Short-time burst carrier capturing method and system for low-orbit satellite Internet of things |
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