CN109541650A - A kind of long period pseudo-random sequence local synchronization code generating method and device - Google Patents
A kind of long period pseudo-random sequence local synchronization code generating method and device Download PDFInfo
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- CN109541650A CN109541650A CN201811523389.2A CN201811523389A CN109541650A CN 109541650 A CN109541650 A CN 109541650A CN 201811523389 A CN201811523389 A CN 201811523389A CN 109541650 A CN109541650 A CN 109541650A
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- long code
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention discloses a kind of long period pseudo-random sequence local synchronization code generating method and device, solve the problems, such as that long code synchronization time long.The method comprising the steps of: acquisition includes the satellite outer input data of local zone time, local position, ephemeris parameter；The coordinate of the satellite position at satellite signal receiving moment is obtained by local zone time, ephemeris parameter to receive position；Transmitting position is obtained by receiving position；The satellite-signal propagation time is calculated according to transmitting position, local position, and the time on Satellite is calculated according to the satellite-signal propagation time, local zone time；Time on Satellite is inputed into clock generating unit, long code generation unit respectively, long code stream is obtained and extracts clock, long code initial phase；Long code stream extraction clock is inputed into the long code and generates unit, obtains local pattern signal.Described device includes processor, clock generating unit, long code generation unit.Long code synchronization time of the present invention is short, equipment is simple, is easily achieved.
Description
Technical field
The present invention relates to field of satellite navigation more particularly to a kind of long period pseudo-random sequence local synchronization code generating methods
And device.
Background technique
GPS, Beidou satellite navigation system are all based on the spread spectrum communication system of CDMA, its signal through numeric data code,
Emitted to the ground after pseudo random sequence code (being also referred to as pseudo-code below) and the modulation of carrier wave three-level.GPS, Beidou signal all include two
The pseudo-code of kind form: the short-period common ranging code of 1ms and 7 days macrocyclic long codes.Long code bit rate is 10.23Mcps, weight
The multiple period is 7 days, if generating every 1ms when local synchronization code carries out a chip movement, needs 10.23e6x 7x0.001=
PN synchronization may be implemented in 71610 talentes.It include in use to the source of satellite time in the PN synchronization technology of existing long code
Portion's data are calculated and are directly obtained by external data, and the method being calculated using internal data is the disadvantage is that calculate the time
Problem that is long, causing capture time long, is unable to satisfy the rapid time demand of navigator fix；It is existing directly to be obtained by external data
Into the method for satellite time, external data is complicated, is not easy to obtain.
Summary of the invention
The present invention provides a kind of long period pseudo-random sequence local synchronization code generating method and device, solve existing method and
The problem that device long code synchronization time is grown.
A kind of long period pseudo-random sequence local synchronization code generating method comprising the steps of: obtain comprising local zone time,
The satellite outer input data of local position, ephemeris parameter；By the local zone time, ephemeris parameter, according to satellite orbit meter
Calculation method obtains the coordinate of the satellite position at satellite signal receiving moment to receive position；Described defend is obtained by the reception position
The coordinate of the satellite position of star signal emission time is transmitting position；Satellite is calculated according to the transmitting position, local position
Signal propagation time is the difference for emitting position and the local position again divided by the light velocity；When being propagated according to the satellite-signal
Between, local zone time the difference that time on Satellite is the local zone time and the satellite-signal propagation time is calculated；By institute
It states that the time on Satellite inputs to clock generating unit respectively, long code generates unit, obtains long code stream and extract clock, at the beginning of long code
Beginning phase；Long code stream extraction clock is inputed into the long code and generates unit, obtains local pattern signal.
Preferably, the transmitting position is equal with the reception numerical value of position.
Preferably, the ephemeris parameter is GPS ephemeris parameter or Beidou ephemeris parameter.
A kind of long period pseudo-random sequence local synchronization code generating means include for the method: processor, when
Clock generation unit, long code generate unit；The processor is calculated described for receiving the satellite outer input data
Time on Satellite；The clock generating unit, for receiving the time on the Satellite, when generating long code stream extraction
Clock；The long code generates unit, and for receiving on the Satellite time, long code stream extracts clock, it exports described local long
Code signal.
Further, the processor is realized using ARM or DSP.
Further, the clock generating unit is realized using programmable logic device.
Preferably, the long code is generated unit and is realized using special chip.
Beneficial effect of the present invention includes: long period pseudo-random sequence local synchronization code generating method provided by the invention, is adopted
The time on star is calculated with the mode of outer input data, and then generates local synchronization code, greatly shortens the PN synchronization time；It is right
The pseudo-code time synchronizing method of external data is used than other, the external data that the present invention uses uses current local time,
Local position, GPS ephemeris parameter, these data can be obtained by other moonscope equipment, implementation method simple possible, can be with
For satellite navigation receiver to the fast Acquisition of GPS, Big Dipper satellite signal long code.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is a kind of long period pseudo-random sequence local synchronization code generating method flow embodiment；
Fig. 2 is a kind of long period pseudo-random sequence local synchronization code generating means embodiment.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
GPS, Beidou satellite navigation system are all based on the spread spectrum communication system of CDMA, its signal through numeric data code,
Emitted to the ground after pseudo random sequence code (being also referred to as pseudo-code below) and the modulation of carrier wave three-level.Wherein, pseudo-code belongs to GPS, north
Second level of bucket signal, satellite navigation receiver can just obtain numeric data code after needing to carry out carrier wave and PN synchronization, carry out
Navigator fix calculates.GPS, Beidou signal all include the pseudo-code of two kinds of forms: the short-period common ranging code of 1ms and 7 days long weeks
The long code of phase.Common ranging code is made of 1023 chips, and every 1ms is repeated, and is carried out once if generating every 1ms when local synchronization code
Chip is mobile, and PN synchronization may be implemented in longest 1.023s, and the satellite signal search of this short time is applied for navigator fix
Process is acceptable.Long code bit rate is 10.23Mcps, and the repetition period is 7 days, if generating every 1ms when local synchronization code
It is mobile to carry out a chip, needs 10.23e6x 7x0.001=71610 talent that PN synchronization, navigator fix application may be implemented
This prolonged signal search process can not be waited.
The technical solution provided below in conjunction with attached drawing, each embodiment that the present invention will be described in detail.
Fig. 1 is a kind of long period pseudo-random sequence local synchronization code generating method flow embodiment, for realizing long period
The local synchronization of pseudo random sequence code, as the embodiment of the present application, a kind of long period pseudo-random sequence local synchronization code generation side
Method comprising the steps of:
Step 101, acquisition includes the satellite outer input data of local zone time, local position, ephemeris parameter.
In a step 101, the ephemeris parameter is GPS ephemeris parameter or Beidou ephemeris parameter.It should be noted that institute
Stating ephemeris parameter can be GPS ephemeris parameter or Beidou ephemeris parameter in the embodiment of the present invention, be also possible to other navigation
The ephemeris parameter of system, is not specially limited here.
Step 102, it obtains satellite-signal according to satellite orbit calculation method by the local zone time, ephemeris parameter and connects
The coordinate of the satellite position that time receiving carves is to receive position.
In a step 102, the satellite orbit calculation method is the prior art, is not illustrated here.
Step 103, the coordinate of the satellite position of the satellite-signal emission time is obtained as transmitting position by the reception position
It sets.
In step 103, the transmitting position is equal with the reception numerical value of position, i.e., the described reception position is equal to institute
State transmitting position.
In step 103, since the orbit altitude of satellite is higher than 20,000 kilometers, satellite-signal spread speed is about 3 × 108
Meter per second, the local satellite navigation reception of satellite-signal arrival can be calculated divided by the formula of speed by being equal to distance according to the time
The delay of machine is less than 100 milliseconds.Since satellite motion speed is about thousands of meter per seconds, due to satellite position in 100 milliseconds
Signal propagation delay caused by changes in coordinates is less than 4 microseconds, therefore when calculating the transmitting position in embodiments of the present invention, suddenly
It has omited satellite-signal and has received satellite position in the propagation delay at satellite-signal moment from emission time to satellite navigation receiver
The variable quantity of coordinate.
In step 103, due to ionosphere, to the delay of propagation path caused by process, earth rotation within 1 microsecond,
When therefore calculating the transmitting position, ignore ionosphere, be delayed to propagation path caused by process, earth rotation interior satellite position
The variable quantity of coordinate.
Step 104, the satellite-signal propagation time is calculated as the transmitting position according to the transmitting position, local position
The difference with the local position is set again divided by the light velocity.
At step 104, the difference of the transmitting position and the local position is between satellite navigation receiver and satellite
Distance.
Step 105, being calculated on Satellite the time according to the satellite-signal propagation time, local zone time is described
The difference of ground time and the satellite-signal propagation delay.
Step 106, the time on the Satellite is inputed into clock generating unit, long code generation unit respectively, is grown
Code code stream extracts clock, long code initial phase.
In step 106, the clock generating unit is programmable logic device, and it is dedicated core that the long code, which generates unit,
Piece, obtains that the long code stream extracts clock, the method for long code initial phase is the prior art by the time on the Satellite,
Here excessive explanation is not done.
Step 107, long code stream extraction clock is inputed into the long code and generates unit, obtain local long code letter
Number.
In step 107, the local pattern signal is that the long code generates unit in long code stream extraction clock
Under the action of generate, generation method is the prior art, do not do repeated explanation here.
Due to local code signal in long period pseudo-random sequence local synchronization code generating method provided in an embodiment of the present invention
With the pseudo-random sequence in satellite navigation signals use identical star on the time, thus they be it is synchronous, the method can
To be removed for the pseudo-code of satellite navigation signals, finally obtains numeric data code and carry out navigator fix calculating.
Fig. 2 is a kind of long period pseudo-random sequence local synchronization code generating means embodiment, for passing through the long period
Pseudo-random sequence local synchronization code generating method generates local synchronization code, as the embodiment of the present application, a kind of long period pseudorandom
Sequence local synchronization code generating means include: processor 1, clock generating unit 2, long code generate unit 3.
The time on the Satellite is calculated for receiving the satellite outer input data in the processor；It is described
Clock generating unit generates the long code stream and extracts clock for receiving the time on the Satellite；The long code generates single
Member, for receiving on the Satellite time, long code stream extracts clock, export the local pattern signal.
The long code generates unit and receives the time on the Satellite, generates pattern signal, the pattern signal is described
Under the action of long code stream extracts clock, the local pattern signal is generated.
As the embodiment of the present invention, the long code is generated unit and is realized using special chip, and it is raw that the long code generates unit
Process at the local pattern signal is the prior art, does not do excessive explanation here.
As the embodiment of the present invention, the processor is realized using ARM or DSP, it should be noted that the processor
Effect is by the satellite outer input data, and by the time on Satellite is calculated, the processor can be this hair
ARM, DSP in bright embodiment are also possible to other devices that can be calculated, such as single-chip microcontroller, are not specially limited here.
As the embodiment of the present invention, the clock generating unit is realized using programmable logic device, it should be noted that
The effect of the clock generating unit is to generate long code stream to extract clock, and the clock generating unit can be implementation of the present invention
Programmable logic device in example, such as FPAG are also possible to other devices, are not specially limited here.
Long period pseudo-random sequence local synchronization code generating means provided in an embodiment of the present invention, are inputted using external data
Mode realize long period pseudo-random sequence local synchronization, code is short synchronization time, and equipment is simple, is easily achieved.
It should be noted that the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, commodity or the equipment that include a series of elements not only include those elements, but also including
Other elements that are not explicitly listed, or further include for this process, method, commodity or the intrinsic element of equipment.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, there is also other identical elements in commodity or equipment.
The above description is only an embodiment of the present invention, is not intended to restrict the invention.For those skilled in the art
For, the invention may be variously modified and varied.All any modifications made within the spirit and principles of the present invention are equal
Replacement, improvement etc., should be included within scope of the presently claimed invention.
Claims (7)
1. a kind of long period pseudo-random sequence local synchronization code generating method, which is characterized in that comprise the steps of:
Acquisition includes the satellite outer input data of local zone time, local position, ephemeris parameter；
The satellite at satellite signal receiving moment is obtained according to satellite orbit calculation method by the local zone time, ephemeris parameter
Position coordinates are to receive position；
The coordinate of the satellite position of the satellite-signal emission time is obtained as transmitting position by the reception position；
The satellite-signal propagation time is calculated as the transmitting position and the local according to the transmitting position, local position
The difference of position is again divided by the light velocity；
According to the satellite-signal propagation time, local zone time be calculated on Satellite the time be the local zone time with it is described
The difference in satellite-signal propagation time；
Time on the Satellite is inputed into clock generating unit, long code generation unit respectively, when obtaining long code stream extraction
Clock, long code initial phase；
Long code stream extraction clock is inputed into the long code and generates unit, obtains local pattern signal.
2. long period pseudo-random sequence local synchronization code generating method as described in claim 1, which is characterized in that the transmitting
Position is equal with the reception numerical value of position.
3. long period pseudo-random sequence local synchronization code generating method as described in claim 1, which is characterized in that the ephemeris
Parameter is GPS ephemeris parameter or Beidou ephemeris parameter.
4. a kind of long period pseudo-random sequence local synchronization code generating means are used for the described in any item sides of claims 1 to 3
Method is, characterized by comprising: processor, clock generating unit, long code generate unit；
The time on the Satellite is calculated for receiving the satellite outer input data in the processor；
The clock generating unit generates the long code stream and extracts clock for receiving the time on the Satellite；
The long code generates unit, and for receiving on the Satellite time, long code stream extracts clock, export the local
Pattern signal.
5. long period pseudo-random sequence local synchronization code generating means as claimed in claim 4, which is characterized in that the processing
Device is realized using ARM or DSP.
6. long period pseudo-random sequence local synchronization code generating means as claimed in claim 4, which is characterized in that the clock
Generation unit is realized using programmable logic device.
7. long period pseudo-random sequence local synchronization code generating means as claimed in claim 4, which is characterized in that the long code
Unit is generated to realize using special chip.
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Cited By (1)
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| CN113009527A (en) * | 2021-02-23 | 2021-06-22 | 湖南中森通信科技有限公司 | Universal satellite navigation pseudo code generation method |
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