Satellite drift tracking method based on pseudo-random sequence
A pseudo-random sequence, satellite drift technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve a large number of equipment, expensive, ranging from millions to tens of millions and other problems, saving money The effect of cost, strong real-time performance, simple and practical calculation process
Active Publication Date: 2012-01-11
北京华信泰科技股份有限公司
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Problems solved by technology
The disadvantage of the traditional method is that when calculating the satellite drift, the measurement and control signal and the real-time orbit information of the satellite must first be known
These information can only be obtained by the satellite measurement and control system after a long period of measurement and tracking, which requires a lot of professional equipment. At the same time, the establishment of such a satellite measurement and control system is expensive, ranging from millions to tens of millions.
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[0027] as attached figure 1 As shown, a satellite drift tracking method based on a pseudo-random sequence includes the following steps:
[0028] (1) Generate a pseudo-random sequence
[0029] Use a pseudo-random sequence generator to generate a specific pseudo-random sequence periodically under the drive of the system clock. The pseudo-random sequence generator sequentially generates m1, m2, m3...mn a total of n codewords, n=2 1 -1 where 1 is the length of the pseudorandom sequence. 1 must meet T is the system clock cycle, when T = 10MHz, 1 should generally be greater than 10, W is the size of the observation window.
[0030] For example: the generating polynomial is: x 18 +x 17 +x 16 +x 13 +x 12 +x 10 +x 8 +x 6 +x 3 +x+1, the initial value of the shift register is 011010101001010101. When measuring with this sequence, its observation window W≤(2 18 -1)T.
[0031] (2) Send the pseudo-random sequence to the satellite
[0032] The pseudo-random sequence generat...
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The invention belongs to a tracking method, and relates to a satellite drift tracking method based on a pseudo-random sequence, which comprises the following steps: (1) producing the pseudo-random sequence; (2) sending the pseudo-random sequence to a satellite; (3) receiving the pseudo-random sequence sent back to the satellite; and (4) calculating the drifting amount of the satellite. The invention has the significant effects that: the time difference of transmission and reception of identical codes are recorded based on transmission and reception of a PN (pseudo-noise) sequence, the drifting change rate of the satellite can be calculated according to the formula, and the whole calculation process is simple. Compared with the method of the traditional technology in which the drifting amount of the satellite is calculated according to satellite control signals and a satellite track, the calculation process is simple and practical and has practicality. Moreover, the satellite tracking accuracy can be adjusted freely at any time according to needs, and the cost of capital can be greatly saved.
Description
technical field [0001] The invention belongs to a tracking method, and relates to a satellite drift tracking method based on a pseudo-random sequence. Background technique [0002] In the satellite communication system, since the satellite is in the outer space of the earth and is affected by various gravitational forces, even the geostationary orbit satellite is not fixed relative to the ground receiving station. Geosynchronous orbit satellites will drift and disturb within a certain range. But this kind of disturbance is an important influence in the process of using satellite networking, and it directly leads to the change of satellite transmission delay. The traditional method is to use the satellite's measurement and control signal and satellite orbit to calculate the drift of the satellite in the measurement and control center. The disadvantage of the traditional method is that when calculating the satellite drift, the measurement and control signal and the real-time...
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IPC IPC(8): G01S19/24H04B1/7085H04B1/7075
Inventor 韦鹿闫鸣声梁小芃
Owner 北京华信泰科技股份有限公司