Satellite positioning method, module and terminal based on RNSS

A satellite positioning and satellite technology, applied in the RNSS-based satellite positioning method, processing module and terminal field, can solve the problems affecting the accuracy and deviation of the user machine, and achieve the effect of improving the positioning and timing accuracy

Active Publication Date: 2014-03-26

TECHTOTOP MICROELECTRONICS

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide an accurate calculation method for the position of the Beidou No. T...

Abstract

The invention discloses a satellite positioning method based on an RNSS. The satellite positioning method comprises the steps that a time delay value T1 of sending the nth sub-frame in a superframe from a master station to a satellite is obtained; the motion time T2 of the satellite in the period when the nth sub-frame in the superframe is sent from the master station to the satellite is worked out according to the time delay value T1; according to the coordinate value of the satellite and the speed value of the satellite in a broadcast message and the motion time of the satellite, the accurate position coordinate of the satellite is obtained through calculation. By the adoption of the satellite positioning method, the problem that due to the fact that a large deviation already exists between the utilized satellite position in the broadcast message and the actual satellite position when positioning and time service calculation by the Compass-1 satellite system are conducted, the precision of a subscriber machine is influenced is solved. The satellite positioning method has the advantages that the positioning precision and the time service precision are improved. The invention further provides an information processing module and terminal.

Application Domain

Radio-controlled time-piecesSatellite radio beaconing

Technology Topic

Time delaysEnvironmental geology +7

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Examples

Experimental program(1)

Example Embodiment

[0014] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, and not to limit the present invention.

[0015] figure 1 It is a flowchart of the RNSS-based satellite positioning method of the present invention.

[0016] Such as figure 1 As shown, the present invention is implemented through the following technical solutions: an accurate calculation method for the position of the Beidou-1 satellite, which includes three steps: S101. Obtain the delay value of the nth subframe in a superframe from the main station to the satellite. T1; S102. Calculate the satellite movement time T2 during the period from the total station to the satellite in the nth subframe in a superframe according to the delay value T1; S103, according to the satellite coordinate value and the satellite speed value in the broadcast message. Satellite movement time T2, the precise position coordinates of the satellite are calculated.

[0017] According to the text format file, the transmission of the outbound signal of the head office is transmitted in the form of superframes and subframes in the time domain. Each superframe includes 1920 subframes, and the subframe number is from 1 to 1920. The propagation time is 60 seconds, and the propagation time of each subframe is 31.25 milliseconds.

[0018] S101. Obtain a time delay value T1 for the nth subframe in a superframe from the central station to the satellite, including the following content:

[0019] (1) Assuming that the first frame of the superframe sent by the main station is the first frame, the propagation delay from the main station to the satellite can be directly extracted from the broadcast message.

[0020] (2) Between two adjacent superframes, suppose the superframe sent by the main station first is the mth superframe (m> 0), the propagation delay of the first frame from the terminal to the satellite is Troi, the superframe sent later is the m+1th superframe, and the propagation delay of the first frame from the terminal to the satellite is Troi2, then when m+1 superframes For transmission in the nth subframe, the propagation delay value from the main station to the satellite is: T1=Troi2+(Troi2-Troi)x((n-1)/1920).

[0021] S102. Calculate the satellite motion time T2 during the period from the head station to the satellite in the nth subframe in a superframe according to the delay value T1, including the following content:

[0022] (1) In a super frame, the delay of the first frame is 0ms, the delay of the second frame is 31.25ms, and the delay of the third frame is 31.25x2. Therefore, the equation for calculating the delay of the nth frame is: (n-1) x31.25ms;

[0023] (2) Therefore, in a super frame, the movement time of the satellite is: T1+(n-1)x31.25ms= T1+(n-1)x0.03125s;

[0024] (3) Due to the characteristics of the Beidou generation, the positioning solution can only be calculated at this minute after the ephemeris data is effectively updated in the previous minute, so the satellite movement time also needs to add a 60-second delay: T2= T1+(n-1)x0.03125s+60s

[0025] Step S3: According to the satellite coordinate values (X0, Y0, Z0) and satellite speed (Vx, Vy, Vz) values in the broadcast message combined with time T2, the precise position coordinates of the satellite are calculated, such as figure 2 As shown, the specific calculation method is as follows:

[0026] (1) The distance of satellite movement is: D = (Vx,Vy,Vz) x T2

[0027] (2) The precise coordinates of the satellite: (X,Y,Z) = (X0,Y0,Z0) + D = (X0,Y0,Z0) + (Vx,Vy,Vz) x T2.

[0028] Further, the present invention applies the signal processing chip of the Beidou generation satellite navigation system as described above.

[0029] Further, the present invention applies the signal processing module of the Beidou satellite navigation system of the aforementioned Beidou satellite navigation system signal processing chip.

[0030] Further, the present invention also applies the terminal of the signal processing module of the Beidou I satellite navigation system.

[0031] The above-mentioned embodiments only express several implementation modes of the present invention, and their description is more specific and detailed, but they should not be understood as a limitation to the patent scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

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