A method for determining the RDSS signal strength of the BeiDou Navigation Satellite System

Abstract

This invention belongs to the field of communication technology of the BeiDou Navigation Satellite System, specifically relating to a method for determining the RDSS signal strength of the BeiDou Navigation Satellite System. The method includes: arranging the received BeiDou 3rd generation S2A branch signals, BeiDou 3rd generation S2C_d branch signals, and BeiDou 2nd generation S1 branch signals in descending order of carrier-to-noise ratio; determining the number of beams in each branch signal; and determining the signal strength of each branch signal based on the number of beams and the carrier-to-noise ratio of each beam.

Description

Technical Field

[0001] This invention belongs to the field of communication technology of BeiDou satellite navigation system, and specifically relates to a method for judging the RDSS signal strength of BeiDou satellite navigation system. Background Technology

[0002] The BeiDou Navigation Satellite System (BDS) is a global satellite navigation system independently developed by my country. It provides high-precision, high-reliability positioning, navigation, and timing services to various users worldwide, 24 / 7, and also features short message communication capabilities. It is currently widely used in both military and civilian fields. Compared to GPS, BDS has the advantage of RDSS (Radio Determination Satellite Service) functionality, integrating short message communication and positioning capabilities. Currently, BeiDou user terminals display all received beams and their carrier-to-noise ratios, requiring users to manually assess the RDSS signal strength. Users cannot directly determine the availability of the RDSS function. Summary of the Invention

[0003] Purpose of the invention: To provide a method for judging the signal strength of the BeiDou Navigation Satellite System (RDSS), enabling users to directly obtain the signal strength of each branch of the BeiDou RDSS.

[0004] The technical solution of the present invention:

[0005] A method for determining the RDSS signal strength of the BeiDou Navigation Satellite System includes:

[0006] The received BeiDou 3rd generation S2A branch signals, BeiDou 3rd generation S2C_d branch signals, and BeiDou 2nd generation S1 branch signals are arranged in descending order of carrier-to-noise ratio.

[0007] Determine the number of beams in each branch signal;

[0008] The signal strength of each branch is determined based on the number of beams in each branch signal and the carrier-to-noise ratio of each beam.

[0009] Furthermore, the signal strength of each branch is determined based on the number of beams in each branch signal and the carrier-to-noise ratio of each beam, specifically including:

[0010] If the total number of outgoing beams of the current branch is greater than or equal to 4, and the carrier-to-noise ratio of the 4th beam is greater than or equal to the first threshold, then the signal strength of the current branch is determined to be "very good".

[0011] If the carrier-to-noise ratio of the fourth beam is less than the first threshold, while the carrier-to-noise ratio of the third beam is greater than or equal to the second threshold, then the signal strength of the current branch is determined to be "good".

[0012] If the carrier-to-noise ratio of the third beam is less than the second threshold, while the carrier-to-noise ratio of the second beam is greater than or equal to the third threshold, then the signal strength of the current branch is determined to be "normal".

[0013] If the carrier-to-noise ratio of the second beam is less than the third threshold, the signal strength of the current branch is determined to be "poor". The first threshold is greater than the second threshold, and the second threshold is greater than the third threshold.

[0014] Furthermore, the signal strength of each branch is determined based on the number of beams in each branch signal and the carrier-to-noise ratio of each beam, specifically including:

[0015] If the total number of outgoing beams of the current branch is equal to 3, and the carrier-to-noise ratio of the 3rd beam is greater than or equal to the second threshold, then the signal strength of the current branch is determined to be "good".

[0016] If the carrier-to-noise ratio of the third beam is less than the second threshold, while the carrier-to-noise ratio of the second beam is greater than or equal to the third threshold, then the signal strength of the current branch is determined to be "normal".

[0017] If the carrier-to-noise ratio of the second beam is less than the third threshold, the signal strength of the current branch is judged as "poor".

[0018] Furthermore, the signal strength of each branch is determined based on the number of beams in each branch signal and the carrier-to-noise ratio of each beam, specifically including:

[0019] If the total number of outgoing beams in the current branch is equal to 2, and the carrier-to-noise ratio of the second beam is greater than or equal to the third threshold, then the signal strength of the current branch is determined to be "normal".

[0020] If the carrier-to-noise ratio of the second beam is less than the third threshold, the signal strength of the current branch is judged as "poor".

[0021] Furthermore, the signal strength of each branch is determined based on the number of beams in each branch signal and the carrier-to-noise ratio of each beam, specifically including:

[0022] If the total number of beams in the current branch is equal to 1, then the signal strength of the current branch is determined to be "poor".

[0023] Furthermore, the method also includes:

[0024] The signal strength of each branch is displayed to the user through text and / or graphics.

[0025] Furthermore, given that the current branch is the Beidou 3rd generation S2A branch, the first threshold is 56, the second threshold is 53, and the third threshold is 51.

[0026] Furthermore, given that the current branch is the Beidou 3rd generation S2C_d branch, the first threshold is 47, the second threshold is 44, and the third threshold is 42.

[0027] Furthermore, given that the current branch is the Beidou 2 S1 branch, the first threshold is 51, the second threshold is 49, and the third threshold is 47.

[0028] Beneficial effects:

[0029] Using the method of this invention, users can intuitively judge the RDSS signal strength of the BeiDou system on the BeiDou user terminal and related display devices, and select the corresponding branch for active positioning or short message communication based on the signal strength. Attached Figure Description

[0030] Figure 1 Schematic diagram of the RDSS signal strength judgment method of BeiDou satellite navigation system;

[0031] Figure 2 Flowchart of the RDSS signal strength determination method when the total number of outgoing beams of the current branch is greater than or equal to 4;

[0032] Figure 3 Flowchart of the RDSS signal strength determination method when the total number of outgoing beams of the current branch is equal to 3;

[0033] Figure 4 Flowchart of the RDSS signal strength determination method when the total number of outgoing beams of the current branch is equal to 2;

[0034] Figure 5 Flowchart of the RDSS signal strength determination method when the total number of outgoing beams of the current branch is equal to 1;

[0035] Figure 6 This is a schematic diagram showing the values ​​of the intensity threshold for each branch.

[0036] Figure 7 This is a schematic diagram showing the strength status of each branch of the BeiDou satellite system. Detailed Implementation

[0037] Currently, the BeiDou user terminal displays all the received RDSS beams and their carrier-to-noise ratios, allowing users to automatically judge the BeiDou RDSS signal strength. However, when the signal strength is insufficient for short message communication and positioning, no clear prompts are given, requiring users to make their own judgments based on complex beam information.

[0038] The strength of the RDSS signal in the BeiDou system affects the success rate of short messages and positioning for users. The RDSS signal strength is determined by the number of beams sent by the BeiDou satellite navigation system to the BeiDou user terminal via PWI commands and the carrier-to-noise ratio of each beam.

[0039] This invention proposes an intuitive method for judging the signal strength of the BeiDou Navigation Satellite System (RDSS), and displays the results to the user in the form of text or graphics, so that the user can directly obtain the signal strength of each branch of the BeiDou RDSS, including "very good", "good", "average" and "poor".

[0040] The BeiDou Navigation Satellite System (BDS) sends RDSS beam information to BeiDou user terminals via PWI commands. The RDSS beams mainly include the outgoing beam information from the BeiDou-3 S2A branch, the BeiDou-3 S2C_d branch, and the BeiDou-2 S1 branch. Among these, the signal strength of the BeiDou-2 S1 branch is related to the success rate of active positioning and short message communication using BeiDou-2; the signal strength of the BeiDou-3 S2A branch is related to the success rate of BeiDou-3 military active positioning and short message communication; and the signal strength of the BeiDou-3 S2C_d branch is related to the success rate of BeiDou-3 civilian active positioning and short message communication.

[0041] 1. Method for judging the signal strength of Beidou 3rd generation S2A branch:

[0042] Arrange all beams of the BeiDou 3 S2A branch in descending order of carrier-to-noise ratio. When the total number of outgoing beams of the BeiDou 3 S2A branch is greater than or equal to 4, the determination order is as follows:

[0043] 1) If the carrier-to-noise ratio of the 4th beam is greater than or equal to x1, the signal strength of the Beidou 3rd generation S2A branch is determined to be "very good";

[0044] 2) If the carrier-to-noise ratio of the fourth beam is less than x1, while the carrier-to-noise ratio of the third beam is greater than or equal to x2, then the signal strength of the Beidou 3rd generation S2A branch is determined to be "good".

[0045] 3) If the carrier-to-noise ratio of the third beam is less than x2, while the carrier-to-noise ratio of the second beam is greater than or equal to x3, then the signal strength of the Beidou 3rd generation S2A branch is determined to be "normal".

[0046] 4) If the carrier-to-noise ratio of the second beam is less than x3, the signal strength of the Beidou 3rd generation S2A branch is judged as "poor";

[0047] Arrange all beams of the BeiDou 3 S2A branch in descending order of carrier-to-noise ratio. When the total number of outgoing beams of the BeiDou 3 S2A branch is equal to 3, the determination order is as follows:

[0048] 1) If the carrier-to-noise ratio of the third beam is greater than or equal to x2, the signal strength of the Beidou 3rd generation S2A branch is determined to be "good";

[0049] 2) If the carrier-to-noise ratio of the third beam is less than x2, while the carrier-to-noise ratio of the second beam is greater than or equal to x3, then the signal strength of Beidou 3 (S2A) is determined to be "normal".

[0050] 3) If the carrier-to-noise ratio of the second beam is less than x3, the signal strength of the Beidou 3rd generation S2A branch is judged as "poor";

[0051] Note 1: There is no "very good" state in this case.

[0052] Arrange all beams of the BeiDou 3 S2A branch in descending order of carrier-to-noise ratio. When the total number of outgoing beams of the BeiDou 3 S2A branch is equal to 2, the determination order is as follows:

[0053] 1) If the carrier-to-noise ratio of the second beam is greater than or equal to x3, the signal strength of the Beidou 3rd generation S2A branch is determined to be "normal".

[0054] 2) If the carrier-to-noise ratio of the second beam is less than x3, the signal strength of the Beidou 3rd generation S2A branch is judged as "poor";

[0055] Note 2: In this case, there is no "very good" or "good".

[0056] When the total number of beams in the BeiDou 3 S2A branch is equal to 1, the signal strength of the BeiDou 3 S2A branch is judged as "poor".

[0057] 2. Method for judging the signal strength of Beidou 3rd generation S2C_d branch:

[0058] Arrange all beams of the BeiDou 3rd generation S2C_d branch in descending order of carrier-to-noise ratio. When the total number of outgoing beams of the BeiDou 3rd generation S2C_d branch is greater than or equal to 4, the determination order is as follows:

[0059] 1) If the carrier-to-noise ratio of the 4th beam is greater than or equal to y1, then the signal strength of the Beidou 3rd generation S2C_d branch is determined to be "very good";

[0060] 2) If the carrier-to-noise ratio of the fourth beam is less than y1, while the carrier-to-noise ratio of the third beam is greater than or equal to y2, then the signal strength of the Beidou 3rd generation S2C_d branch is determined to be "good".

[0061] 3) If the carrier-to-noise ratio of the third beam is less than y2, while the carrier-to-noise ratio of the second beam is greater than or equal to y3, then the signal strength of the Beidou 3rd generation S2C_d branch is determined to be "normal".

[0062] 4) If the carrier-to-noise ratio of the second beam is less than y3, the signal strength of the Beidou 3rd generation S2C_d branch is judged as "poor";

[0063] Arrange all beams of the BeiDou 3 S2C_d branch in descending order of carrier-to-noise ratio. When the total number of BeiDou 3 S2C_d beams is equal to 3, the determination order is as follows:

[0064] 1) If the carrier-to-noise ratio of the third beam is greater than or equal to y2, the signal strength of the Beidou 3rd generation S2C_d branch is determined to be "good";

[0065] 2) If the carrier-to-noise ratio of the third beam is less than y2, while the carrier-to-noise ratio of the second beam is greater than or equal to y3, then the signal strength of the Beidou 3rd generation S2C_d branch is determined to be "normal".

[0066] 3) If the carrier-to-noise ratio of the second beam is less than y3, the signal strength of the Beidou 3rd generation S2C_d branch is judged as "poor";

[0067] Note 3: There is no "very good" state in this case.

[0068] Arrange all beams of the BeiDou 3 S2C_d tributary in descending order of carrier-to-noise ratio. When the total number of beams in the BeiDou 3 S2C_d tributary is equal to 2, the determination order is as follows:

[0069] 1) If the carrier-to-noise ratio of the second beam is greater than or equal to y3, the signal strength of the Beidou 3rd generation S2C_d branch is determined to be "normal".

[0070] 2) If the carrier-to-noise ratio of the second beam is less than y3, the signal strength of the Beidou 3rd generation S2C_d branch is judged as "poor";

[0071] Note 4: In this case, there is no "very good" or "good".

[0072] When the total number of beams in the BeiDou 3 S2C_d branch is equal to 1, the signal strength of the BeiDou 3 S2C_d branch is judged as "poor".

[0073] 3. Method for judging the signal strength of Beidou-2 S1 branch:

[0074] Arrange all beams of the BeiDou-2 S1 tributary in descending order of carrier-to-noise ratio. When the total number of beams in the BeiDou-2 S1 tributary is greater than or equal to 4, the determination order is as follows:

[0075] 1) If the carrier-to-noise ratio of the fourth beam is greater than or equal to z1, the signal strength of the Beidou-2 S1 branch is determined to be "very good";

[0076] 2) If the carrier-to-noise ratio of the fourth beam is less than z1, while the carrier-to-noise ratio of the third beam is greater than or equal to z2, then the signal strength of the Beidou 2 S1 branch is determined to be "good".

[0077] 3) If the carrier-to-noise ratio of the third beam is less than z2, while the carrier-to-noise ratio of the second beam is greater than or equal to z3, then the signal strength of the Beidou-2 S1 branch is determined to be "normal".

[0078] 4) If the carrier-to-noise ratio of the second beam is less than z3, the signal strength of the Beidou-2 S1 branch is judged as "poor";

[0079] Arrange all beams of the BeiDou-2 S1 tributary in descending order of carrier-to-noise ratio. When the total number of beams in the BeiDou-2 S1 tributary is equal to 3, the determination order is as follows:

[0080] 1) If the carrier-to-noise ratio of the third beam is greater than or equal to z2, the signal strength of the Beidou-2 S1 branch is determined to be "good";

[0081] 2) If the carrier-to-noise ratio of the third beam is less than z2, while the carrier-to-noise ratio of the second beam is greater than or equal to z3, then the signal strength of the Beidou 2 S1 branch is determined to be "normal".

[0082] 3) If the carrier-to-noise ratio of the second beam is less than z3, the signal strength of the Beidou-2 S1 branch is judged as "poor";

[0083] Note 5: There is no "very good" state in this case.

[0084] Arrange all beams of the BeiDou-2 S1 tributary in descending order of carrier-to-noise ratio. When the total number of beams in the BeiDou-2 S1 tributary is equal to 2, the determination order is as follows:

[0085] 1) If the carrier-to-noise ratio of the second beam is greater than or equal to z3, the signal strength of the Beidou-2 S1 branch is determined to be "normal".

[0086] 2) If the carrier-to-noise ratio of the second beam is less than z3, the signal strength of the Beidou-2 S1 branch is judged as "poor";

[0087] Note 6: In this case, there is no "very good" or "good".

[0088] When the total number of BeiDou-2 (S1I) beams is equal to 1, the BeiDou-2 (S1I) signal strength is determined to be "poor".

[0089] Example:

[0090] During the development of a certain aircraft type, the BeiDou Navigation Satellite System has been used as the primary active positioning and short message communication device for communication in long-distance and complex terrain environments. The BeiDou satellite system transmits beam information to the airborne BeiDou user terminal via PWI commands. The airborne BeiDou user terminal then sends the beam information to the display device. The display device receives beam information from the BeiDou-2 S1 branch, BeiDou-3 S2A branch, and BeiDou-3 S2C_d branch, such as... Figure 1 The display device arranges the beam information of each Beidou branch in descending order of carrier-to-noise ratio (101) and determines the number of beams in each branch (102). For example... Figure 2 If the number of beams is greater than or equal to 4 (103), read the carrier-to-noise ratio of each beam and determine the branch signal strength in the order of 201, 202, 203, 204; Figure 3 If the number of beams is equal to 3 (104), read the carrier-to-noise ratio of each beam and determine the branch signal strength in the order of 205, 206, 207; Figure 4 If the number of beams is equal to 2 (105), the branch signal strength is determined according to the order of 208 and 209; for example Figure 5 If the number of beams is equal to 1 (106), the branch signal strength is determined according to 210.

[0091] In the method, the values ​​of x1, x2, x3, y1, y2, y3, z1, z2, and z3 are taken according to... Figure 6 The 301 procedure is performed.

[0092] Based on the judgment results, the display device shows the strength status of each branch of the Beidou satellite system on the human-machine interface, such as Figure 7 This is for the user to decide.

Claims

1. A method for determining the RDSS signal strength of the BeiDou satellite navigation system, characterized in that, include: The received BeiDou 3rd generation S2A branch signals, BeiDou 3rd generation S2C_d branch signals, and BeiDou 2nd generation S1 branch signals are arranged in descending order of carrier-to-noise ratio. Determine the number of beams in each branch signal; The signal strength of each branch is determined based on the number of beams in each branch signal and the carrier-to-noise ratio of each beam.

2. The method for determining the RDSS signal strength of the BeiDou satellite navigation system according to claim 1, characterized in that, The signal strength of each branch is determined based on the number of beams in each branch and the carrier-to-noise ratio of each beam, specifically including: If the total number of outgoing beams of the current branch is greater than or equal to 4, and the carrier-to-noise ratio of the 4th beam is greater than or equal to the first threshold, then the signal strength of the current branch is determined to be "very good". If the carrier-to-noise ratio of the fourth beam is less than the first threshold, while the carrier-to-noise ratio of the third beam is greater than or equal to the second threshold, then the signal strength of the current branch is determined to be "good". If the carrier-to-noise ratio of the third beam is less than the second threshold, while the carrier-to-noise ratio of the second beam is greater than or equal to the third threshold, then the signal strength of the current branch is determined to be "normal". If the carrier-to-noise ratio of the second beam is less than the third threshold, the signal strength of the current branch is determined to be "poor". The first threshold is greater than the second threshold, and the second threshold is greater than the third threshold.

3. The method for determining the RDSS signal strength of the BeiDou satellite navigation system according to claim 1, characterized in that, The signal strength of each branch is determined based on the number of beams in each branch and the carrier-to-noise ratio of each beam, specifically including: If the total number of outgoing beams of the current branch is equal to 3, and the carrier-to-noise ratio of the 3rd beam is greater than or equal to the second threshold, then the signal strength of the current branch is determined to be "good". If the carrier-to-noise ratio of the third beam is less than the second threshold, while the carrier-to-noise ratio of the second beam is greater than or equal to the third threshold, then the signal strength of the current branch is determined to be "normal". If the carrier-to-noise ratio of the second beam is less than the third threshold, the signal strength of the current branch is judged as "poor".

4. The method for determining the RDSS signal strength of the BeiDou satellite navigation system according to claim 1, characterized in that, The signal strength of each branch is determined based on the number of beams in each branch and the carrier-to-noise ratio of each beam, specifically including: If the total number of outgoing beams of the current branch is equal to 2, and the carrier-to-noise ratio of the second beam is greater than or equal to the third threshold, then the signal strength of the current branch is determined to be "normal". If the carrier-to-noise ratio of the second beam is less than the third threshold, the signal strength of the current branch is judged as "poor".

5. The method for determining the RDSS signal strength of the BeiDou satellite navigation system according to claim 1, characterized in that, The signal strength of each branch is determined based on the number of beams in each branch and the carrier-to-noise ratio of each beam, specifically including: If the total number of beams in the current branch is equal to 1, then the signal strength of the current branch is determined to be "poor".

6. The method for determining the RDSS signal strength of the BeiDou satellite navigation system according to claim 1, characterized in that, The method further includes: The signal strength of each branch is displayed to the user through text and / or graphics.

7. The method for determining the RDSS signal strength of the BeiDou satellite navigation system according to any one of claims 2-5, characterized in that, When the current branch is the Beidou 3rd generation S2A branch, the first threshold is 56, the second threshold is 53, and the third threshold is 51.

8. The method for determining the RDSS signal strength of the BeiDou satellite navigation system according to any one of claims 2-5, characterized in that, When the current branch is the Beidou 3rd generation S2C_d branch, the first threshold is 47, the second threshold is 44, and the third threshold is 42.

9. The method for determining the RDSS signal strength of the BeiDou satellite navigation system according to any one of claims 2-5, characterized in that, When the current branch is the Beidou 2 S1 branch, the first threshold is 51, the second threshold is 49, and the third threshold is 47.

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