CN119094005B - Ku-band star link downlink signal detection method - Google Patents
Ku-band star link downlink signal detection method Download PDFInfo
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- CN119094005B CN119094005B CN202411514882.3A CN202411514882A CN119094005B CN 119094005 B CN119094005 B CN 119094005B CN 202411514882 A CN202411514882 A CN 202411514882A CN 119094005 B CN119094005 B CN 119094005B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
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- Computer Networks & Wireless Communication (AREA)
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- Monitoring And Testing Of Transmission In General (AREA)
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Abstract
The invention discloses a Ku wave band star link downlink signal detection method which comprises the following steps of 1, collecting signal IQ data by a broadband receiver, wherein the sampling rate is fs, the length of a collected sample is L, 2, recording the collected complex signal sample as X (n), n=0, 1, L-2, L-1, and detecting the frame period of a signal by adopting a cyclic correlation algorithm, and 3, and aiming at the signalSearching for a spectrum peak, wherein n=10, 11, & gt, searching for the part L/2-1, and recording the index of the position of the searched maximum spectrum peak as I max, calculating the frame period T of a signal according to I max, wherein the unit is ms, and judging whether the T meets the following formula or not:Among them,Is the frame length of the star link downlink signal,Is the amount of redundancy provided to avoid multipath interference,Should meet: step 6, detecting the symbol period, for Detect its presence inIf there is a spectral peak in the vicinity, the process goes to the next step.
Description
Technical Field
The invention relates to the technical field of radio monitoring, in particular to a Ku-band star-link downlink signal detection method.
Background
In recent years, satellite internet services have exhibited explosive developments worldwide, and no regulatory scheme exists. Because the satellite belongs to broadband burst signals, the low-orbit satellite has short appearance time in the field of view, and only a few minutes, the detection and identification of the required signals must be quick and effective to meet the monitoring requirements.
Disclosure of Invention
The invention aims to provide a Ku-band star-link downlink signal detection method which is used for solving the problem of Ku-band star-link downlink signal detection.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a Ku band star link downlink signal detection method comprises the following steps:
step 1, a broadband receiver collects signal IQ data, the sampling rate is fs, and the collected sample length is L;
and 2, recording the acquired complex signal sample as X (n), wherein n=0, 1, & gt, L-2, L-1, and detecting the frame period of the signal by adopting a cyclic autocorrelation algorithm, wherein a cyclic autocorrelation detection formula is as follows:
Step 3, pairing Spectral peak searching is performed taking into accountThe method has symmetry, has direct current components, only searches n=10, 11, and the part L/2-1, and the position index of the searched maximum spectrum peak is marked as I max;
Step 4, calculating a frame period T of the signal according to the I max, wherein the unit is ms, and the formula is as follows:
step 5, judging whether T meets the following formula:
wherein, Is the frame length of the star link downlink signal,Is the amount of redundancy provided to avoid multipath interference,The following should be satisfied:
If T meets the condition, the next step is carried out, and if not, the detection is stopped;
step 6, detecting symbol period, for Detect its presence inWhether a spectral peak exists nearby, namely whether the following formula is satisfied or not is detected:
wherein, (Is the effective symbol length of the star link downlink signal),Is the length of the detection window and,Is the detection threshold (the empirical value takes 3),
If the detection result is not satisfied, the detection is exited;
step 7, estimating the symbol length to ensure that ng=round # ),N = The peak factor H (i) is calculated according to the following formula:
*
Detection by spectral peak search And (3) calculating the average distance between the peaks, namely, ns, if Ns=N+Ng is met, then considering that the star link downlink signal is detected, and if not, then exiting the detection.
Compared with the prior art, the invention has the following beneficial effects:
The invention detects whether the parameters accord with the characteristics of the downlink signal of the star chain or not through the prior knowledge of the downlink signal of the known star chain and the parameter estimation mode, and has important significance for rapidly detecting the downlink signal of the star chain.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Fig. 2 is a cyclic autocorrelation curve of a downlink signal of a star link, and the maximum peak position is a frame period.
Fig. 3 is an effective symbol length estimation of a satellite downlink signal.
Fig. 4 is a symbol period and cyclic prefix length joint estimation of a star link downlink signal.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the preferred embodiments of the present application will be described in more detail with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the application. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be fixedly connected, or indirectly connected through intermediaries, for example, or may be in communication with each other between two elements or in an interaction relationship between the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship of the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or display that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or display.
A method for detecting a Ku-band star link downlink signal according to an embodiment of the present application will be described in detail below with reference to fig. 1 to 4. It is noted that the following examples are only for explaining the present application and are not to be construed as limiting the present application.
Example 1:
as shown in fig. 1, a Ku band star link downlink signal detection method includes the following steps:
Step 1, a broadband receiver collects signal IQ data, wherein the sampling rate is fs=500 MHz, and the length of a collected sample is l=fs×0.01, namely the sampling duration is 10ms;
and 2, recording the acquired complex signal sample as X (n), wherein n=0, 1, & gt, L-2, L-1, and detecting the frame period of the signal by adopting a cyclic autocorrelation algorithm, wherein a cyclic autocorrelation detection formula is as follows:
Step 3, pairing Spectral peak searching is performed taking into accountHaving symmetry, see specifically fig. 2, and having a direct current component, searching only for the n=10, 11..l/2-1 portion, the maximum spectral peak position index searched is noted as I max;
Step 4, calculating a frame period T of the signal according to the I max, wherein the unit is ms, and the formula is as follows:
step 5, judging whether T meets the following formula:
wherein, Is the frame length of the star link downlink signal,Is the amount of redundancy provided to avoid multipath interference,=0.0006;
If T meets the condition, the next step is carried out, and if not, the detection is stopped;
step 6, detecting symbol period, for Detect its presence inWhether a spectral peak exists nearby, namely whether the following formula is satisfied or not is detected:
wherein, (Is the effective symbol length of the star link downlink signal),=50 Is the detection window length,Is the detection threshold (empirical value taken as 3), as shown in figure 3 below,=2133 (Matlab index starts from 1, so 1 is subtracted)
If the detection result is not satisfied, the detection is exited;
step 7, estimating the symbol length to ensure that ng=round # )=67,N = The peak factor H (i) is calculated according to the following formula:
*
Detection by spectral peak search And (3) calculating the average distance between the peaks, namely, ns, if Ns=N+Ng is met, then considering that the star link downlink signal is detected, and if not, then exiting the detection. As shown in fig. 4 below, the average pitch is 2200, meeting 2200=67+2133.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (2)
1. The Ku-band star link downlink signal detection method is characterized by comprising the following steps of:
step 1, a broadband receiver collects signal IQ data, the sampling rate is fs, and the collected sample length is L;
step 2, recording the acquired complex signal sample as X (n), n=0, 1, L-2, L-1, and detecting the frame period of the signal by using a cyclic autocorrelation algorithm, wherein the cyclic autocorrelation algorithm has a detection formula as follows:
;
Step 3, pairing A spectral peak search was performed, where n=10, 11,.. avoiding direct current components, and marking the position index of the searched maximum spectrum peak as I max;
Step 4, calculating a frame period T of the signal according to the I max, wherein the unit is ms, and the formula is as follows:
;
step 5, judging whether T meets the following formula:
;
wherein, Is the frame length of the star link downlink signal,Is the amount of redundancy provided to avoid multipath interference,The following should be satisfied:
;
If T meets the condition, the next step is carried out, and if not, the detection is stopped;
step 6, detecting symbol period, for Detect its presence inWhether a spectral peak exists nearby, namely whether the following formula is satisfied or not is detected:
;
wherein, Wherein, the method comprises the steps of, wherein,For the effective symbol length of the star link downstream signal,Is the length of the detection window and,Is a detection threshold;
If the detection result is not satisfied, the detection is exited;
step 7, estimating the symbol length to ensure that ng=round # ),N = The peak factor H (i) is calculated according to the following formula:
*;
Detection by spectral peak search And (3) calculating the average distance between the peaks, namely, ns, if Ns=N+Ng is met, then considering that the star link downlink signal is detected, and if not, then exiting the detection.
2. The Ku-band star-link downlink signal detection method according to claim 1, wherein, in step 6,The empirical value takes 3.
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| CN118677515A (en) * | 2024-08-22 | 2024-09-20 | 成都华日通讯技术股份有限公司 | Satellite internet user terminal monitoring system |
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| FI101438B1 (en) * | 1996-05-21 | 1998-06-15 | Nokia Mobile Phones Ltd | Signal retrieval in a satellite telephone system |
| CN108134649B (en) * | 2017-11-29 | 2020-08-14 | 西安空间无线电技术研究所 | A kind of spaceborne ADS-B signal burst detection method and system |
| CN110850385A (en) * | 2019-11-20 | 2020-02-28 | 桂林电子科技大学 | Unmanned aerial vehicle micro-motion characteristic detection method based on passive radar and cyclic spectrum |
| US12088398B1 (en) * | 2020-02-29 | 2024-09-10 | Space Exploration Technologies Corp. | Configurable orthogonal frequency division multiplexing (OFDM) signal and transmitter and receiver for same |
| CN117811887B (en) * | 2023-12-19 | 2024-11-12 | 国家无线电监测中心 | Method, device and equipment for analyzing low-orbit internet satellite signals |
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| CN115208733A (en) * | 2022-07-20 | 2022-10-18 | 成都华日通讯技术股份有限公司 | LTE and 5GNR signal joint identification method |
| CN118677515A (en) * | 2024-08-22 | 2024-09-20 | 成都华日通讯技术股份有限公司 | Satellite internet user terminal monitoring system |
Non-Patent Citations (1)
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| Signal Structure of the Starlink Ku-Band Downlink;Todd E. Humphreys;《arXiv:2210.11578v3》;20231231;第1-14页 * |
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