CN112711041A - Method and device for capturing satellite signals - Google Patents
Method and device for capturing satellite signals Download PDFInfo
- Publication number
- CN112711041A CN112711041A CN202011523194.5A CN202011523194A CN112711041A CN 112711041 A CN112711041 A CN 112711041A CN 202011523194 A CN202011523194 A CN 202011523194A CN 112711041 A CN112711041 A CN 112711041A
- Authority
- CN
- China
- Prior art keywords
- detected
- search unit
- threshold
- capture
- search
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 70
- 230000010354 integration Effects 0.000 claims abstract description 70
- 230000001427 coherent effect Effects 0.000 claims description 35
- 238000012545 processing Methods 0.000 claims description 28
- 230000035945 sensitivity Effects 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 7
- 230000000875 corresponding effect Effects 0.000 description 6
- 238000012795 verification Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
Abstract
Disclosed herein are a method and an apparatus for acquiring satellite signals, including: searching a search unit by using a preset capture mode, and detecting and judging the quantity to be detected of the search unit according to a preset capture threshold and a division threshold; when the satellite signals are possibly captured in the search unit, another preset capture mode is used for continuing searching the search unit, and detection judgment is carried out on the quantity to be detected of the search unit according to a preset capture threshold and a division threshold; repeating said searching and said detecting decision for said searching unit until a decision is made that a satellite is acquired or that no satellite signal is detected; wherein the integration time and/or number of integrations differs between the capture modes. The method and the device can at least improve the accuracy of the capture detection judgment.
Description
Technical Field
The present invention relates to the field of navigation technologies, and in particular, to a method and an apparatus for capturing satellite signals.
Background
Navigation technology plays an important role in the development process of human history, and along with the continuous progress of society, the technology, particularly satellite navigation positioning technology, is more and more closely related to the life of people. Currently, the main Satellite NAvigation systems in the world include a Global Positioning System (GPS), a BD2 (the second beidou), a Global NAvigation Satellite System (GLONASS), and a Galileo (Galileo) Satellite NAvigation System. Both GPS and BD2 use CDMA (Code Division Multiple Access) technology, and the physical layer frame structures thereof are much similar, so that the receiver design is similar, including rf front end processing, baseband digital signal processing, and positioning navigation operations. The baseband digital signal processing process generally includes acquisition, tracking, bit synchronization, frame synchronization, and the like.
The acquisition process of the satellite navigation receiver to the satellite signal includes frequency mixing, correlation operation, coherent integration/non-coherent integration and decision, and the principle of navigation signal acquisition is shown in fig. 1. In the process of capturing a certain satellite signal by a receiver, a digital intermediate frequency signal is firstly mixed with a sine carrier on a receiving in-phase branch and a cosine carrier on an orthogonal branch respectively, then the mixing result is correlated with a copied C/A code, then the coherent results of the in-phase branch and the orthogonal branch are respectively subjected to coherent integration for a period of time to generate two coherent integration result data, and finally the data of the two coherent integration results are subjected to incoherent integration to obtain a to-be-detected quantity and are sent to a detection decision device. The detection decision device carries out detection decision on the operation result according to the set decision rule, and the receiver determines the next action according to the success or failure of the decision result. Therefore, whether the signal detection result is successful or not and the subsequent processing depend on the judgment result of the detection decider, so that whether the design of the detection decider is reasonable or not directly influences the acquisition performance of the receiver.
The detection judgment technology of the related technology has the problem of low accuracy of acquisition detection judgment, and particularly, the accuracy of acquisition detection judgment of satellite signals in signal intensity change is lower.
Disclosure of Invention
The invention provides a method and a device for capturing satellite signals, which can at least improve the accuracy of capturing detection judgment.
The present application provides the following technical solutions.
A method of acquisition of satellite signals, comprising:
searching a search unit by using a preset capture mode, and detecting and judging the quantity to be detected of the search unit according to a preset capture threshold and a division threshold;
when the satellite signals are possibly captured in the search unit, another preset capture mode is used for continuing searching the search unit, and detection judgment is carried out on the quantity to be detected of the search unit according to a preset capture threshold and a division threshold;
repeating said searching and said detecting decision for said search unit until it is determined that a satellite is acquired or no satellite signal is detected on said search unit; wherein the integration time and/or number of integrations differs between the capture modes.
Wherein the capture mode comprises: a fast scan mode, a high sensitivity mode; wherein the integration time and/or number of integrations of the fast scan mode is less than the high sensitivity mode.
The detecting and judging the amount to be detected of the search unit according to the preset capture threshold and the division threshold comprises the following steps: and detecting and judging the quantity to be detected of the search unit according to the capture threshold, and detecting and judging the quantity to be detected of the search unit according to a judgment result and the division threshold.
The detecting and judging the amount to be detected of the search unit according to the preset capture threshold and the division threshold comprises the following steps:
respectively comparing the to-be-detected quantity of the search unit non-coherent integration with the capture threshold and the division threshold;
if the quantity to be detected is not less than the capture threshold, judging that the satellite signals are captured in the current search unit;
if the quantity to be detected is smaller than the division threshold, judging that no satellite signal is detected in the current search unit;
and if the quantity to be detected is less than the acquisition threshold but not less than the division threshold, judging that satellite signals can be acquired in the search unit.
The detecting and judging the amount to be detected of the search unit according to the preset capture threshold and the division threshold comprises the following steps: firstly, comparing the amount to be detected of the search unit non-coherent integration with the capture threshold; and when the quantity to be detected is smaller than the capture threshold, comparing the quantity to be detected with the division threshold.
An apparatus for acquisition of satellite signals, comprising: a search processing unit and a detection judging unit; the search processing unit is used for searching the search unit by using a preset capture mode; and the searching unit is used for continuing to search the searching unit by using another preset capturing mode after receiving the notification of the detection judging unit; the detection judgment unit is used for detecting and judging the quantity to be detected of the search unit according to a preset capture threshold and a division threshold; notifying the search processing unit when it is determined that a satellite signal is likely to be acquired in the search unit; notifying the search processing unit to end the search of the search unit when it is determined that a satellite is acquired or no satellite signal is detected on the search unit; wherein the integration time and/or number of integrations differs between the capture modes.
Wherein the capture mode comprises: a fast scan mode, a high sensitivity mode; wherein the integration time and/or number of integrations of the fast scan mode is less than the high sensitivity mode.
Wherein the detection decision unit includes:
the first decision device is used for carrying out detection decision on the quantity to be detected of the search unit according to the capture threshold;
and the second decision device is used for detecting and deciding the quantity to be detected of the search unit according to the decision result of the first decision device and the division threshold.
The first decision device is specifically configured to compare the amount to be detected of the search unit non-coherent integration with the capture threshold; when the quantity to be detected is not less than the capture threshold, judging that the satellite signals are captured in the current search unit; when the quantity to be detected is smaller than the capture threshold, sending the quantity to be detected into the second decision device; the second decision device is specifically configured to compare the to-be-detected quantity of the search unit non-coherent integration with the division threshold, decide that a satellite signal is not detected in the current search unit when the to-be-detected quantity is smaller than the division threshold, decide that a satellite signal may be captured in the search unit when the to-be-detected quantity is not smaller than the division threshold, and notify the search processing unit.
A navigation receiver comprises the satellite signal acquisition device.
The advantages of the present application include at least:
in the embodiment of the invention, the acquisition of the satellite signal is realized by combining two thresholds (namely the acquisition threshold and the division threshold) and two acquisition modes, so that the accuracy of acquisition detection judgment is improved, the accuracy of acquisition verification is improved, the satellite signal with the signal intensity changing can be adapted, and the omission or false alarm is avoided.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a navigation signal acquisition principle;
fig. 2 is a schematic flowchart of a satellite signal acquisition method according to a first embodiment;
FIG. 3 is an exemplary flowchart illustrating a satellite signal acquisition according to an embodiment;
fig. 4 is a flow chart of satellite signal acquisition in one embodiment;
fig. 5 is a schematic structural diagram of a satellite signal capturing device according to a second embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
In the related art, the detection and decision techniques mainly include the following three techniques:
1. the maximum incoherent integral magnitude is compared to a threshold value. Specifically, if the maximum value of the non-coherent integration amplitude is smaller than the capture threshold, the detection decision device judges that the signal is not searched yet, then the receiver adjusts the carrier numerically-controlled oscillator and the C/A code numerically-controlled oscillator according to the set search step length, and continues to search and detect the signal in the next search unit; otherwise, as long as the maximum value of the non-coherent integration amplitude is not less than the capture threshold, the detection decision device judges that the signal is searched.
The detection performance of the detection judgment method greatly depends on the setting of the threshold, and once the threshold is too low or too high, a larger false alarm probability or missed detection probability occurs, so that the accuracy of detection judgment is lower. In addition, the method cannot detect the satellite which is changed from weak to strong, and is not suitable for detection judgment of the satellite signal with the changing signal intensity.
2. The ratio of the maximum incoherent integrated amplitude to the second largest value of the incoherent integrated amplitude is compared to a threshold value. Specifically, first, the maximum value of the non-coherent integration amplitude and the second largest value of the non-coherent integration amplitude excluding the code phase at which the maximum value is located and the left and right half code phases are found. The detection judger compares the ratio of the maximum value and the second maximum value of the non-coherent integral amplitude with a preset threshold, if the ratio is smaller than the threshold, the detection judger judges that the signal is not searched, so that the receiver adjusts the carrier wave numerical control oscillator and the C/A code numerical control oscillator according to a set search step length, and continues to search and detect the signal in the next search unit; otherwise, if the ratio is not smaller than the threshold, the detection decision device determines that the signal is found, and the receiver then generally further confirms the success of signal acquisition.
The threshold value of the ratio in the detection and judgment method is difficult to determine, and higher omission factor or false alarm probability exists, so that the accuracy of detection and judgment is lower.
3. A double threshold method.
Specifically, firstly, two threshold values, namely a high threshold value and a low threshold value, are set, the threshold values are respectively assumed to be a threshold 1 and a threshold 2, three peak values of the non-coherent integration amplitude are found, the code phase, the Doppler shift and the ratio of the amplitude to the noise bottom corresponding to each peak value are given, and the code phase, the Doppler shift and the ratio of the amplitude to the noise bottom are sent to a detection decision device. If the amplitude of the maximum peak value is not less than the threshold 1, the search is ended in advance, and the corresponding satellite is directly switched to the tracking phase. If the amplitude of the maximum peak is less than the threshold 2, the search is ended, and it is determined that no satellite signal is detected in the acquisition. If the amplitude of the maximum peak value is less than the threshold 1 but not less than the threshold 2, starting consistency check; the consistency check is to check the three peak values on the code phase and the Doppler frequency shift, and the three peak values are considered to be correctly captured as long as the three peak values are consistent with each other, and then tracking is carried out; otherwise, the search is determined to fail. Wherein, the definition of code phase consistency is: the code phase difference of the peak values obtained in the capturing and verifying stages is small enough and is approximately within the range of two chips; doppler shift consistency means that the doppler shifts of the peaks obtained during the acquisition and verification phases must differ by a sufficiently small amount.
When determining three peak values, the detection and judgment method cannot ensure the rationality of the three peak values, namely the three peak values should be on the same frequency point theoretically, and the code phase interval should not exceed one chip. Thus, there may be a higher probability of false alarm.
As can be seen from the above, the accuracy of the acquisition detection decision in the related art is not high, and especially the accuracy of the acquisition detection decision of the satellite signal in the signal strength variation is lower. Aiming at the technical problem, the technical scheme is provided, so that the accuracy of capturing detection judgment can be improved, the accuracy of capturing verification is further improved, and the method can be suitable for satellite signals with signal strength changing.
The following describes in detail an implementation of the technical solution of the present application.
Example one
As shown in fig. 2, the present embodiment provides a method for acquiring a satellite signal, which may include:
repeating the searching and the detecting decisions of steps 201 and 202 for the search unit until it is determined that a satellite is acquired or no satellite signal is detected on the search unit; wherein the integration time and/or number of integrations differs between the capture modes.
In the embodiment, the two thresholds (namely the capture threshold and the division threshold) are combined with the two capture modes to realize the capture of the satellite signal, so that the accuracy of the capture detection judgment is improved, the accuracy of the capture verification is improved, the satellite signal with the signal intensity changing can be adapted, and the omission or false alarm is avoided.
In this embodiment, the capture threshold VHThe amplitude value is the lower limit which can be judged as the current capturing success, namely the capturing success of the round can be judged at least when the threshold is reached; division threshold VLThe current acquisition failure is determined as the upper limit of the amplitude, that is, the acquisition failure of the current round on the current search unit can be determined as long as the amplitude is less than the threshold.
In this embodiment, the to-be-detected quantity may be an amplitude or an energy value of a signal obtained when integration is finished after the current search unit is searched, and the energy value may be represented as a square of the amplitude of the signal. In one implementation, the detection value may be a peak value of a maximum amplitude of non-coherent integration obtained when integration is ended after a search is performed on the current search unit.
In an implementation manner of this embodiment, the scan mode may include: a fast scan mode, a high sensitivity mode; wherein the integration time and/or number of integrations of the fast scan mode is less than the high sensitivity mode. In a specific implementation manner, a fast scan mode may be used for searching, a high sensitivity mode may be used for searching the current search unit when it is determined that a satellite signal may be captured in the search unit, and a fast scan mode may be used for searching the current search unit when it is determined that a satellite signal may be captured in the search unit, and the above steps are repeated until it is determined that a satellite signal is captured in the current search unit or a satellite signal is not detected in the current search unit or the number of searches reaches a predetermined value (for example, the number of searches is controlled by a counter, and the search of the current search unit is stopped when the number of searches reaches the maximum value of the counter, which may avoid infinite loop). Therefore, through the combination of the two modes of the fast scanning and the high-precision scanning, the searching efficiency can be improved, the accuracy of the acquisition detection judgment can be improved, and the method is particularly suitable for the acquisition of the satellite signals with the signal intensity changing.
In an implementation manner of this embodiment, the detection decision may be performed on the to-be-detected quantity of the search unit according to the capture threshold, and then the detection decision may be performed on the to-be-detected quantity of the search unit according to a result of the decision and the division threshold. Therefore, the satellite signals which can be captured by the current search unit are determined through the capture threshold, and then further detection judgment is carried out on the satellite signals which are possibly captured, so that the processing efficiency of the capture detection judgment can be improved.
In an implementation manner of this embodiment, the to-be-detected quantity of the search unit non-coherent integration may be respectively compared with the capture threshold and the division threshold; if the quantity to be detected is not less than the capture threshold, judging that the satellite signals are captured in the current search unit; if the quantity to be detected is smaller than the division threshold, judging that no satellite signal is detected in the current search unit; and if the quantity to be detected is less than the acquisition threshold but not less than the division threshold, judging that satellite signals can be acquired in the search unit. Specifically, the amount to be detected of the search unit non-coherent integration may be compared with the capture threshold; and when the quantity to be detected is smaller than the capture threshold, comparing the quantity to be detected with the division threshold so as to improve the processing efficiency of detection judgment. Of course, the present application can also be implemented in other manners, for example, the to-be-detected quantity of the search unit non-coherent integration may be simultaneously compared with the capture threshold and the division threshold, or may be compared with the division threshold first, and then compared with the capture threshold based on the comparison result. The implementation of a particular process is not limited herein.
In an exemplary processing manner of this embodiment, two acquisition modes are divided, where the first mode is a Fast Scan (FS) mode, that is, a shorter integration time or a smaller number of integration times is used for acquisition to complete a Fast Scan of satellite signals; the second mode is a High-Sensitivity (HS) mode, i.e. a long integration time or a large number of integration times is used in acquisition to complete High-precision scanning of satellite signals and improve acquisition Sensitivity. In addition, two thresholds, one high and one low, are set, and the score is assumedThe other is the acquisition threshold and the division threshold. Two judgers are provided: the decision device 1 and the decision device 2 are respectively corresponding to a capture threshold VH(high threshold) and a division threshold VL。
As shown in fig. 3, a specific flow of the exemplary processing manner may include:
After entering the HS mode, the current search unit is searched with high sensitivity, specifically, a longer coherent integration time and a larger number of non-coherent integrations are added to the current search unit. After the integration is finished, when the detection judgment is performed on the to-be-detected quantity of a certain search unit, the judgment still enters the judgment device 1.
In view of the above, the current searching unit is repeatedly searched by switching the acquisition mode in the above process until a satellite is acquired or no satellite signal is detected in the acquisition, and the search of the current searching unit is ended; in addition, the search of the current search unit can be finished when the search times of the current search unit reach a certain preset value, and infinite loop can be avoided. For example, the number of searches of a search unit is controlled by a counter, and the search of the search unit is stopped when the number of searches of a search unit reaches the maximum value of the counter.
The following describes a specific implementation process of the present embodiment in detail with reference to examples.
Examples of the invention
As shown in fig. 4, an exemplary procedure for satellite signal acquisition in this example may include:
in step 401, when the satellite navigation receiver performs acquisition of a certain satellite signal, a fast search is first performed using the FS mode.
in step 403, the satellite is acquired in the current search unit, the search is ended in advance, and the corresponding satellite is directly switched to the tracking phase.
In this step, after entering the HS mode, a high-sensitivity search is performed on the current search unit, specifically, a longer coherent integration time and a larger number of non-coherent integration times are added to the current search unit, and after the integration is completed, the process proceeds to step 408;
step 409, further comparing the amplitude V of the maximum peak value with a threshold VLThe relationship (2) of (c). If the amplitude V of the maximum peak is less than VLThen it is determined that the acquisition did not detect satellite signals on the current searcher unit. If the amplitude V of the maximum peak value is not less than the threshold VLThen, it is explained inThe FS mode is entered again when there is a high probability that a satellite signal is captured in the current search unit, i.e. the step 401 is returned to, and a fast search is continued for the current search unit.
Since the strength of the satellite signal changes with time, the current search unit is repeatedly searched in the process of this example until it is determined that a satellite is acquired or it is determined that no satellite signal is detected during the acquisition, and the search of the current search unit is ended.
In practical applications, the method of the present embodiment can be applied to a satellite navigation receiver, and in particular, can be implemented by a baseband digital signal processing module.
Example two
As shown in fig. 5, the present application also provides an apparatus for acquiring a satellite signal, including: a search processing unit 51 and a detection decision unit 52; wherein the content of the first and second substances,
a search processing unit 51 operable to search the search unit using a preset capture mode; and the searching unit is used for continuing to search the searching unit by using another preset capturing mode after receiving the notification of the detection judging unit;
the detection decision unit 52 is configured to perform detection decision on the to-be-detected quantity of the search unit according to a preset capture threshold and a division threshold; notifying the search processing unit 51 when it is determined that satellite signals are likely to be acquired in the search unit; when it is determined that a satellite is acquired or no satellite signal is detected on the search unit, the search processing unit is notified to end the search of the search unit.
Wherein the integration time and/or number of integrations differs between the capture modes.
In an implementation manner of this embodiment, the scan mode may include: a fast scan mode, a high sensitivity mode; wherein the integration time and/or number of integrations of the fast scan mode is less than the high sensitivity mode. In a specific implementation, the search processing unit 51 is configured to perform a search using the fast scan mode, perform a search using the high sensitivity mode when the detection determining unit 52 determines that a satellite signal may be acquired in the search unit, and perform a search using the fast scan mode when the detection determining unit 52 determines that a satellite signal may be acquired in the search unit, and so on until the detection determining unit 52 determines that a satellite signal is acquired in the search unit or a satellite signal is not detected in the search unit. Therefore, through the combination of the two modes of the fast scanning and the high-precision scanning, the searching efficiency can be improved, the accuracy of the acquisition detection judgment can be improved, and the method is particularly suitable for the acquisition of the satellite signals with the signal intensity changing.
In an implementation manner of this embodiment, the detection decision unit 52 may include: the first decider 521 is configured to perform detection decision on the to-be-detected quantity of the search unit according to the capture threshold; and a second decider 522, configured to perform detection decision on the to-be-detected quantity of the search unit according to the decision result of the first decider and the division threshold. That is, the two decision devices correspond to an acquisition threshold (high threshold) and a division threshold (low threshold), respectively. Here, the amount to be detected may be an amplitude or an energy value of a signal obtained when integration is ended after a search is performed on the current search unit, and the energy value may be expressed as a square of the amplitude of the signal. In one implementation, the detection value may be a peak value of a maximum amplitude of non-coherent integration obtained when integration is ended after a search is performed on the current search unit. Accordingly, the decision device here may be an amplitude comparator, an energy value comparator, or the like.
Specifically, the first decider 521 may be specifically configured to compare the amount to be detected of the search unit non-coherent integration with the capture threshold; if the quantity to be detected is not less than the capture threshold, judging that the satellite signals are captured in the current search unit; if the quantity to be detected is smaller than the capture threshold, sending the quantity to be detected into the second decision device; the second decision device 522 may be specifically configured to compare the to-be-detected amount of the search unit non-coherent integration with the division threshold, determine that a satellite signal is not detected in the current search unit when the to-be-detected amount is smaller than the division threshold, determine that a satellite signal may be captured in the search unit when the to-be-detected amount is not smaller than the division threshold, and notify the search processing unit.
In practical applications, the device for capturing satellite signals of the present embodiment can be implemented by a navigation receiver, or can be disposed in the navigation receiver. In one implementation, the capturing means may be implemented by a baseband digital signal processing module of the navigation receiver. The search processing unit 51 and the detection decision unit 52 may be software, hardware, or a combination of both. In one implementation, the search processing unit 51 may include the mixer 1, the mixer 2, the correlator 1, the correlator 2, the C/a code generator, and the carrier digitally controlled oscillator in fig. 1, and the detection decision unit 52 may include the detection decision device in fig. 1.
Other technical details of the present embodiment may refer to the first embodiment.
EXAMPLE III
The application also provides a navigation receiver which comprises the satellite signal acquisition device. Specific technical details can be found in reference to the first embodiment and the second embodiment.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method of acquisition of satellite signals, comprising:
searching a search unit by using a preset capture mode, and detecting and judging the quantity to be detected of the search unit according to a preset capture threshold and a division threshold;
when the satellite signals are possibly captured in the search unit, another preset capture mode is used for continuing searching the search unit, and detection judgment is carried out on the quantity to be detected of the search unit according to a preset capture threshold and a division threshold;
repeating said searching and said detecting decision for said search unit until it is determined that a satellite is acquired or no satellite signal is detected on said search unit; wherein the integration time and/or number of integrations differs between the capture modes.
2. The capturing method according to claim 1, characterized in that:
the capture mode includes: a fast scan mode, a high sensitivity mode; wherein the integration time and/or number of integrations of the fast scan mode is less than the high sensitivity mode.
3. The capturing method according to claim 1, wherein the performing detection decision on the to-be-detected quantity of the search unit according to a preset capturing threshold and a division threshold includes:
and detecting and judging the quantity to be detected of the search unit according to the capture threshold, and detecting and judging the quantity to be detected of the search unit according to a judgment result and the division threshold.
4. The capturing method according to claim 1 or 3, wherein the detecting and determining the to-be-detected quantity of the search unit according to a preset capturing threshold and a division threshold includes:
respectively comparing the to-be-detected quantity of the search unit non-coherent integration with the capture threshold and the division threshold;
if the quantity to be detected is not less than the capture threshold, judging that the satellite signals are captured in the current search unit;
if the quantity to be detected is smaller than the division threshold, judging that no satellite signal is detected in the current search unit;
and if the quantity to be detected is less than the acquisition threshold but not less than the division threshold, judging that satellite signals can be acquired in the search unit.
5. The capturing method according to claim 4, wherein the performing detection decision on the to-be-detected quantity of the search unit according to a preset capturing threshold and a division threshold includes:
firstly, comparing the amount to be detected of the search unit non-coherent integration with the capture threshold; and when the quantity to be detected is smaller than the capture threshold, comparing the quantity to be detected with the division threshold.
6. An apparatus for acquiring a satellite signal, comprising: a search processing unit and a detection judging unit; wherein the content of the first and second substances,
a search processing unit for searching the search unit using a preset capture mode; and the searching unit is used for continuing to search the searching unit by using another preset capturing mode after receiving the notification of the detection judging unit;
the detection judgment unit is used for detecting and judging the quantity to be detected of the search unit according to a preset capture threshold and a division threshold; notifying the search processing unit when it is determined that a satellite signal is likely to be acquired in the search unit; notifying the search processing unit to end the search of the search unit when it is determined that a satellite is acquired or no satellite signal is detected on the search unit;
wherein the integration time and/or number of integrations differs between the capture modes.
7. The capture device of claim 6, wherein the capture mode comprises: a fast scan mode, a high sensitivity mode; wherein the integration time and/or number of integrations of the fast scan mode is less than the high sensitivity mode.
8. The acquisition apparatus according to claim 6, wherein the detection decision unit comprises:
the first decision device is used for carrying out detection decision on the quantity to be detected of the search unit according to the capture threshold;
and the second decision device is used for detecting and deciding the quantity to be detected of the search unit according to the decision result of the first decision device and the division threshold.
9. The capturing device of claim 8,
the first decision device is specifically configured to compare the amount to be detected of the search unit non-coherent integration with the capture threshold; when the quantity to be detected is not less than the capture threshold, judging that the satellite signals are captured in the current search unit; when the quantity to be detected is smaller than the capture threshold, sending the quantity to be detected into the second decision device;
the second decision device is specifically configured to compare the to-be-detected quantity of the search unit non-coherent integration with the division threshold, decide that a satellite signal is not detected in the current search unit when the to-be-detected quantity is smaller than the division threshold, decide that a satellite signal may be captured in the search unit when the to-be-detected quantity is not smaller than the division threshold, and notify the search processing unit.
10. A navigation receiver, characterized in that it comprises acquisition means of satellite signals according to any one of claims 6 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011523194.5A CN112711041A (en) | 2020-12-22 | 2020-12-22 | Method and device for capturing satellite signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011523194.5A CN112711041A (en) | 2020-12-22 | 2020-12-22 | Method and device for capturing satellite signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112711041A true CN112711041A (en) | 2021-04-27 |
Family
ID=75544916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011523194.5A Pending CN112711041A (en) | 2020-12-22 | 2020-12-22 | Method and device for capturing satellite signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112711041A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116430415A (en) * | 2023-03-28 | 2023-07-14 | 北方雷科(安徽)科技有限公司 | Acquisition verification strategy method for self-adaptive multi-peak multi-threshold detection |
-
2020
- 2020-12-22 CN CN202011523194.5A patent/CN112711041A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116430415A (en) * | 2023-03-28 | 2023-07-14 | 北方雷科(安徽)科技有限公司 | Acquisition verification strategy method for self-adaptive multi-peak multi-threshold detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1227939C (en) | Systems and methods for fast terminal synchronization in wireless communication system | |
| US7453926B2 (en) | Bit synchronization detection methods and systems | |
| RU2326398C2 (en) | Signal search procedure for location systems | |
| CN1338156A (en) | Muti-stage CDMA synchronization with parallel execution | |
| CN101030787A (en) | Method and apparatus for estimating signal noise ratio of frequency-amplifying signal | |
| US8855171B2 (en) | Satellite signal acquisition | |
| CN101206255A (en) | Method for capturing GPS weak signal | |
| JP2001108736A5 (en) | ||
| JP2004502175A (en) | Parallel and sequential detection combined to acquire GPS signals | |
| CN112711041A (en) | Method and device for capturing satellite signals | |
| TW200404414A (en) | Iterative CDMA phase and frequency acquisition | |
| US20120027133A1 (en) | Demodulation of data collected prior to bit edge detection | |
| CN106896380B (en) | A kind of adaptive navigation signal acquisition methods and device | |
| CN108267755B (en) | Tracking processing method of navigation signal | |
| JP3543665B2 (en) | GPS receiving terminal with communication function | |
| CN105301611A (en) | Baseband part structure for carrying out eight-frequency point processing on satellite signals | |
| CN107422341B (en) | Method and device for realizing signal capture | |
| EP1738255A1 (en) | Methods and apparatus for detecting local maximums in a two-dimensional data set | |
| CN108627863B (en) | GNSS navigation message data demodulation method and device based on DFT and GNSS receiving terminal | |
| CN104297767B (en) | A kind of adaptive repeatedly resampling aeronautical satellite catching method and realize system | |
| CN112731467A (en) | Detection method and device applied to satellite signal acquisition | |
| CN102495416A (en) | Quick acquisition method for signals of satellite navigation system and device | |
| JP3601241B2 (en) | GPS receiver | |
| CN205920219U (en) | Locator, radio frequency positioner and positioning system | |
| KR100519410B1 (en) | Satellite signal correlator of gps receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |