B1C signal unambiguous tracking method based on pseudo-exponential function

A technology of unambiguous tracking and exponential function, applied in complex mathematical operations, radio wave measurement systems, satellite radio beacon positioning systems, etc., can solve problems such as complex implementation, complex algorithm implementation, and inability to have both at the same time, to achieve good resistance to multiple Diameter performance, elimination of side peaks, and elimination of false locking points

CN114137581APending Publication Date: 2022-03-04江苏隆信德科技有限公司
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Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2022-03-04

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Abstract

Aiming at the tracking fuzziness problem of a Beidou B1C pilot channel QMBOC (6, 1, 4 / 33) signal, the invention provides and designs a B1C signal unambiguous tracking method based on a pseudo-exponential function, which comprises the following steps of: (1) carrying out carrier stripping and code correlation processing on the pilot channel QMBOC (6, 1, 4 / 33) signal; (2) the correlation value is sent to an exponential function module to be processed; (3) the discriminator processes an output value of the exponential function module; and (4) a discriminator result is processed by a loop filter to control a code loop NCO, and a local code phase is adjusted to form a closed loop. According to the invention, secondary peaks of correlation curves can be effectively eliminated, error locking points output by a discriminator are eliminated, correlation results of received signals and local signals are processed by using a pseudo-exponential function module, and unambiguous tracking of QMBOC (6, 1, 4 / 33) signals is realized. Meanwhile, compared with a traditional BPSK-like method, an SCPC method and an ASPeCT method, the B1C signal unambiguous tracking method based on the pseudo exponential function has better anti-multipath performance.
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Description

technical field

[0001] The invention relates to the technical field of signal unambiguous tracking methods, in particular to a B1C signal unambiguous tracking method based on a pseudo-exponential function. Background technique

[0002] The B1C frequency of Beidou-3 navigation system is 1572.42MHz, and the pilot channel is modulated by quadrature multiplexed binary offset carrier (QMBOC), which is time-division multiplexed with the binary offset carrier of GPS ( Time Multiplexed Binary Offset Carrier (TMBOC) modulation and Galileo's composite binary offset carrier (Composite Binary Offset Carrier, CBOC) modulation are binary offset carrier (Binary Offset Carrier, BOC) derived modulation signals, called "new Institutional Navigation Signals". QMBOC signal has a certain degree of similarity with TMBOC and CBOC signals, but the realization of QMBOC signal in time domain is more complicated, which makes the research of QMBOC signal more difficult. Compared with the traditional ...

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Embodiment Construction

[0037] The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0038] Such as figure 1 Shown the steps of the present invention are as follows:

[0039] Step 1: Perform carrier stripping and code correlation processing on the pilot channel QMBOC (6,1,4 / 33) signal.

[0040] Step 2: Send the relevant values ​​to the exponential function module for processing.

[0041] Step 3: The discriminator processes the output value of the exponential function module.

[0042] Step 4: The results of the discriminator are processed by the loop filter to control the code loop NCO, adjust the phase of the local code, and form a closed loop.

[0043] The present invention takes the Beidou No. 3 B1C pilot channel QMBOC (6,1,4 / 33) signal as...