CN113126123A

CN113126123A - GNSS device and GNSS terminal equipment

Info

Publication number: CN113126123A
Application number: CN202011644418.8A
Authority: CN
Inventors: 宋阳; 刘杰
Original assignee: COMNAV TECHNOLOGY Ltd
Current assignee: COMNAV TECHNOLOGY Ltd
Priority date: 2019-12-31
Filing date: 2020-12-31
Publication date: 2021-07-16
Anticipated expiration: 2040-12-31
Also published as: CN113126123B

Abstract

The invention relates to a GNSS, comprising a GNSS module, a GNSS module and a GNSS module, wherein the GNSS module is used for receiving navigation messages from satellites; the spread spectrum radio station is connected with the GNSS module and used for transmitting or receiving data; wherein the spreading code start time of the spreading station is time aligned with an integer number of seconds of data. The invention also relates to GNSS terminal equipment comprising the GNSS device.

Description

GNSS device and GNSS terminal equipment

Technical Field

The invention relates to the technical field of GNSS, in particular to a GNSS device and GNSS terminal equipment.

Background

Currently, GNSS technology is more and more popular, and in the high-precision satellite navigation technology related to GNSS technology, the high-precision satellite navigation technology requires consistent time for satellite data processing, however, in actual work, at least one of the following problems exists: the high-precision satellite navigation technology cannot rapidly achieve time consistency on satellite data processing, so that the problems of low satellite capturing speed, large resource usage amount, weak anti-interference capability and the like are caused, and the problems of low positioning precision, inaccurate positioning, long positioning time, slow positioning and the like are further caused.

Disclosure of Invention

In view of the above, the present invention provides a GNSS device and a GNSS terminal apparatus.

In one aspect, a GNSS apparatus is provided, including a GNSS module that receives navigation messages from satellites; the spread spectrum radio station is connected with the GNSS module and used for transmitting or receiving data; wherein the spreading code start time of the spreading station is time aligned with an integer number of seconds of data.

Further, the interval between the spreading code start time and the data acquisition time is M spreading periods.

Further, the spreading period satisfies the following equation: p is one spreading period, T is one spreading code period, N is the number of chips, and N is a positive integer. The data and the spreading period satisfy the following formula: d is P × M, where D is one bit of data and M is a positive integer.

Furthermore, one frame of navigation message corresponds to a plurality of bits.

In another aspect, a GNSS terminal apparatus is provided, which includes the GNSS device described above.

The embodiment of the invention can at least achieve one of the following beneficial effects:

when the GNSS device works, the starting time of the spread spectrum code is aligned with the whole second time of the data, so that the GNSS device or the terminal equipment can realize high satellite capturing speed, small resource usage amount and strong anti-interference capability, and further achieves the effects of high positioning precision, positioning accuracy, quick positioning and the like.

Drawings

FIG. 1 is a block diagram of a GNSS device in accordance with an embodiment of the present invention;

fig. 2 is a timing diagram of a spreading sequence of a direct sequence spread spectrum transmitting/receiving station based on a satellite time synchronization technique during operation of a GNSS apparatus according to an embodiment of the present invention.

In the following description, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration specific exemplary embodiments in which the disclosure may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the concepts disclosed herein, and it is to be understood that modifications to the various disclosed embodiments may be made, and that other embodiments may be employed, without departing from the scope of the disclosure. The following detailed description is, therefore, not to be taken in a limiting sense.

Detailed Description

In the prior art, the spread spectrum technology has the biggest advantages of strong anti-interference capability, confidentiality, multiple access, networking, multipath resistance and the like, and a DSSS (direct sequence spread spectrum) system reduces the interference power entering a demodulator by means of the relevant processing of pseudo-random codes so as to achieve the aim of interference resistance; the spread spectrum signal can increase the length of a spread spectrum code to obtain enough spread spectrum gain, and a serial or parallel scheme is adopted during acquisition of the spread spectrum signal, and the resource usage amount can linearly increase along with the lengthening of the spread spectrum code. The serial scheme increases the acquisition time linearly as the spreading code lengthens. Although the parallel scheme has high capture speed, the resource usage amount is large; the serial scheme has small resource usage but low capture speed, so that the spread spectrum technology in the prior art cannot have the effects of strong anti-interference, high capture speed and small resource usage.

In view of this, the present invention provides a GNSS device and a GNSS terminal apparatus, wherein when the GNSS device is operating, the start time of a spreading code is aligned with the whole second time of the data, so that the GNSS device or the terminal apparatus can achieve a fast satellite capturing speed, a small resource usage amount, a strong anti-interference capability, and further achieve one of the effects of high positioning accuracy, fast positioning, and the like.

In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.

As shown in fig. 1-2, a GNSS apparatus includes a GNSS module that receives navigation messages from satellites; the spread spectrum radio station is connected with the GNSS module and used for transmitting or receiving data D; specifically, the rising edge of the integer-second time of the data D is aligned in synchronization with the spreading code start time of the spreading radio station. In this embodiment, the GNSS module may be a GNSS board card, but this is merely an example and not a limitation;

Furthermore, one frame of navigation message corresponds to a plurality of bits, and the specific number refers to the condition of coding.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

The teachings of the invention provided herein can be applied to other systems, not necessarily the systems described above. The elements and acts of the various embodiments described above can be combined to provide yet further embodiments.

While certain embodiments of the invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. Indeed, the novel methods and systems described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the methods and systems described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.

Claims

1. A GNSS apparatus, comprising:

the GNSS module is used for receiving navigation messages from satellites;

the spread spectrum radio station is connected with the GNSS module and used for transmitting or receiving data;

wherein the spreading code start time of the spreading radio station is time aligned with an integer number of seconds of the data.

2. The GNSS device of claim 1,

the interval between the spreading code starting time and the data acquisition time is M spreading cycles.

3. The GNSS device of claim 2, wherein the spreading period satisfies the following equation:

P＝T*N.

wherein, P is a spreading period, T is a spreading code period, N is the number of chips, and N is a positive integer.

4. The GNSS device of claim 3, wherein the data and the spreading period satisfy the following equation:

D＝P*M.

wherein D is one bit of the data and M is a positive integer.

5. The GNSS device according to claim 4, wherein a frame of the navigation message corresponds to a plurality of the bits.

6. A GNSS terminal apparatus comprising the GNSS device of any of claims 1 to 5.