CN115561786B - Variable bandwidth code ring processing method applied to Beidou No. three baseband - Google Patents
Variable bandwidth code ring processing method applied to Beidou No. three baseband Download PDFInfo
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- CN115561786B CN115561786B CN202211112696.8A CN202211112696A CN115561786B CN 115561786 B CN115561786 B CN 115561786B CN 202211112696 A CN202211112696 A CN 202211112696A CN 115561786 B CN115561786 B CN 115561786B
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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
- G01S19/29—Acquisition or tracking or demodulation of signals transmitted by the system carrier including Doppler, related
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radio Relay Systems (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention belongs to the technical field of Beidou No. three short message baseband algorithm, and particularly relates to a variable bandwidth code ring processing method applied to a Beidou No. three baseband, wherein the variable bandwidth code ring processing method is realized based on a software loop design method and the like; the invention can realize the changeable loop bandwidth by changing the loop bandwidth value, re-calculating the parameters A, B and C and re-configuring the loop, thereby realizing the larger loop design bandwidth from capturing to tracking migration, improving the success rate of tracking migration, simultaneously adjusting small loop bandwidth after the system enters stable tracking, realizing higher demodulation sensitivity, being very suitable for the Beidou No. three short message baseband algorithm, and achieving the effect of considering the migration capability from capturing to tracking and the sensitivity of signal processing.
Description
Technical Field
The invention belongs to the technical field of Beidou No. three short message baseband algorithms, and particularly relates to a variable bandwidth code ring processing method applied to a Beidou No. three baseband.
Background
FIG. 3 is a flow chart of a conventional variable bandwidth code loop processing method, in which a Beidou No. three satellite signal is divided into two branches of pilot frequency and data, in order to ensure enough acquisition sensitivity, a baseband algorithm needs to acquire and track pilot frequency branch signals preferentially, and then processes data branch signals; the tracking capability and noise performance of the baseband become a pair of irreconcilable contradictions when the baseband processes the pilot signal; thus, the wider the loop bandwidth design of the carrier loop, the better the noise performance of tracking, the higher the receiving sensitivity, but the weaker the corresponding migration capability from acquisition to tracking; the narrower the loop bandwidth design of the carrier loop, the stronger the migration capability from capturing to tracking, but the worse the noise performance of the corresponding tracking, the lower the receiving sensitivity, so that it is needed to develop a variable bandwidth code loop processing method applied to the Beidou No. three baseband, which can consider both the migration capability from capturing to tracking and the sensitivity of signal processing.
Disclosure of Invention
First, the technical problem to be solved
In order to overcome the defects that the narrower the loop bandwidth design is, the stronger the migration capability from capturing to tracking is, but the poorer the corresponding noise performance of tracking is, and the lower the receiving sensitivity is, the invention provides a variable bandwidth code loop processing method applied to Beidou No. three baseband, which can consider both the migration capability from capturing to tracking and the sensitivity of signal processing.
(II) technical scheme
The invention is realized by the following technical scheme: the invention provides a variable bandwidth code ring processing method applied to Beidou No. three baseband, which is realized based on a design method of a software loop:
the design method comprises the following steps:
the satellite signals are processed by a phase comparator, a first bit delay device, a first bit adder, a second bit delay device and a second bit adder in sequence to finally obtain a local NCO carrier:
the first bit delay device processes to obtain a multiplication parameter A, and the multiplication parameter A is reprocessed by the first bit adder;
the phase comparator processes to obtain a multiplication parameter B and a multiplication parameter C;
the multiplication parameter B is processed by a first adder;
the multiplication parameter C is processed by a second bit adder;
the local NCO carrier is processed by a phase comparator;
wherein parameter a=w 3 Parameter b=aw 2 The parameter c= bW, W is the loop bandwidth, a, b is a constant, determined by the carrier loop hardware design system;
the variable bandwidth code ring processing method comprises the following specific steps:
a) Firstly, processing satellite signals by a baseband, and entering tracking and migration after the signals are successfully captured;
b) The method comprises the steps of firstly selecting loop parameters with larger bandwidth for configuration, configuring the loop parameters with larger bandwidth by adopting a software loop design method, and processing satellite signals by adopting a phase comparator, a first bit delay device, a first bit adder, a second bit delay device and a second bit adder in sequence to obtain a local NCO carrier;
c) Judging whether a local NCO carrier wave stably enters signal tracking:
if the signal tracking is not stable, waiting for one second, selecting loop parameters with larger bandwidth again for configuration, processing the local NCO carrier by a phase comparator, recalculating A, B, C, configuring the loop parameters with larger bandwidth, recalculating the local NCO carrier, judging whether the signal tracking is stable or not, waiting for one second again, if the signal tracking is unstable, repeating the steps again, and directly stabilizing the signal tracking;
if the signal tracking is stable, the loop parameters are directly switched, the loop parameters are modified into narrow bandwidth design to be configured, and the narrow bandwidth of the loop parameters is configured, namely the phase comparator, the first bit delayer, the first bit adder, the second bit delayer and the second bit adder are directly adopted to process the loop parameters in sequence, so that the local NCO carrier is obtained until the loop parameters are finished.
The NCO is a local carrier and a code-controlled oscillator.
(III) beneficial effects
Compared with the prior art, the invention has the following beneficial effects:
the invention can realize the changeable loop bandwidth by changing the loop bandwidth value, re-calculating the parameters A, B and C and re-configuring the loop, thereby realizing the larger loop design bandwidth from capturing to tracking migration, improving the success rate of tracking migration, simultaneously adjusting small loop bandwidth after the system enters stable tracking, realizing higher demodulation sensitivity, being very suitable for the Beidou No. three short message baseband algorithm, and achieving the effect of considering the migration capability from capturing to tracking and the sensitivity of signal processing.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
fig. 1 is a flow chart of a variable bandwidth code ring processing method of the present invention.
FIG. 2 is a flow chart of a method of designing a software loop according to the present invention.
Fig. 3 is a flow chart of a conventional variable bandwidth code ring processing method.
Detailed Description
The technical scheme is as follows:
the present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, the invention provides a variable bandwidth code ring processing method applied to a beidou No. three baseband, wherein the variable bandwidth code ring processing method is realized based on a design method of a software loop:
the design method comprises the following steps:
the satellite signals are processed by a phase comparator, a first bit delay device, a first bit adder, a second bit delay device and a second bit adder in sequence to finally obtain a local NCO carrier:
the first bit delay device processes to obtain a multiplication parameter A, and the multiplication parameter A is reprocessed by the first bit adder;
the phase comparator processes to obtain a multiplication parameter B and a multiplication parameter C;
the multiplication parameter B is processed by a first adder;
the multiplication parameter C is processed by a second bit adder;
the local NCO carrier is processed by a phase comparator;
wherein parameter a=w 3 Parameter b=aw 2 The parameter c= bW, W is the loop bandwidth, a, b is a constant, determined by the carrier loop hardware design system;
the variable bandwidth code ring processing method comprises the following specific steps:
d) Firstly, processing satellite signals by a baseband, and entering tracking and migration after the signals are successfully captured;
e) The method comprises the steps of firstly selecting loop parameters with larger bandwidth for configuration, configuring the loop parameters with larger bandwidth by adopting a software loop design method, and processing satellite signals by adopting a phase comparator, a first bit delay device, a first bit adder, a second bit delay device and a second bit adder in sequence to obtain a local NCO carrier;
f) Judging whether a local NCO carrier wave stably enters signal tracking:
if the signal tracking is not stable, waiting for one second, selecting loop parameters with larger bandwidth again for configuration, processing the local NCO carrier by a phase comparator, recalculating A, B, C, configuring the loop parameters with larger bandwidth, recalculating the local NCO carrier, judging whether the signal tracking is stable or not, waiting for one second again, if the signal tracking is unstable, repeating the steps again, and directly stabilizing the signal tracking;
if the signal tracking is stable, the loop parameters are directly switched, the loop parameters are modified into narrow bandwidth design to be configured, and the narrow bandwidth of the loop parameters is configured, namely the phase comparator, the first bit delayer, the first bit adder, the second bit delayer and the second bit adder are directly adopted to process the loop parameters in sequence, so that the local NCO carrier is obtained until the loop parameters are finished.
The NCO is a local carrier and a code-controlled oscillator.
The invention can realize the changeable loop bandwidth by changing the loop bandwidth value, re-calculating the parameters A, B and C and re-configuring the loop, thereby realizing the larger loop design bandwidth from capturing to tracking and migration, improving the success rate of tracking and migration, simultaneously adjusting small loop bandwidth after the system enters stable tracking, realizing higher demodulation sensitivity, being very suitable for the Beidou No. three short message baseband algorithm, and achieving the migration capability from capturing to tracking and the sensitivity of signal processing.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A variable bandwidth code ring processing method applied to Beidou No. three baseband is characterized in that: the variable bandwidth code ring processing method is realized based on a design method of a software loop:
the design method comprises the following steps:
the satellite signals are processed by a phase comparator, a first bit delay device, a first bit adder, a second bit delay device and a second bit adder in sequence to finally obtain a local NCO carrier:
the first bit delay device processes to obtain a multiplication parameter A, and the multiplication parameter A is reprocessed by the first bit adder;
the phase comparator processes to obtain a multiplication parameter B and a multiplication parameter C;
the multiplication parameter B is processed by a first adder;
the multiplication parameter C is processed by a second bit adder;
the local NCO carrier is processed by a phase comparator;
wherein parameter a=w 3 Parameter b=aw 2 The parameter c= bW, W is the loop bandwidth, a, b is a constant, determined by the carrier loop hardware design system;
the variable bandwidth code ring processing method comprises the following specific steps:
a) Firstly, processing satellite signals by a baseband, and entering tracking and migration after the signals are successfully captured;
b) The method comprises the steps of firstly selecting loop parameters with larger bandwidth for configuration, configuring the loop parameters with larger bandwidth by adopting a software loop design method, and processing satellite signals by adopting a phase comparator, a first bit delay device, a first bit adder, a second bit delay device and a second bit adder in sequence to obtain a local NCO carrier;
c) Judging whether a local NCO carrier wave stably enters signal tracking:
if the signal tracking is not stable, waiting for one second, selecting loop parameters with larger bandwidth again for configuration, processing the local NCO carrier by a phase comparator, recalculating A, B, C, configuring the loop parameters with larger bandwidth, recalculating the local NCO carrier, judging whether the signal tracking is stable or not, waiting for one second again, if the signal tracking is unstable, repeating the steps again, and directly stabilizing the signal tracking;
if the signal tracking is stable, the loop parameters are directly switched, the loop parameters are modified into narrow bandwidth design to be configured, and the narrow bandwidth of the loop parameters is configured, namely the phase comparator, the first bit delayer, the first bit adder, the second bit delayer and the second bit adder are directly adopted to process the loop parameters in sequence, so that the local NCO carrier is obtained until the loop parameters are finished.
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