CN116125502A - Navigation signal generation method, device, equipment and storage medium - Google Patents
Navigation signal generation method, device, equipment and storage medium Download PDFInfo
- Publication number
- CN116125502A CN116125502A CN202310352407.XA CN202310352407A CN116125502A CN 116125502 A CN116125502 A CN 116125502A CN 202310352407 A CN202310352407 A CN 202310352407A CN 116125502 A CN116125502 A CN 116125502A
- Authority
- CN
- China
- Prior art keywords
- signal
- digital baseband
- baseband signal
- data
- compressed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 title claims abstract description 20
- 238000005070 sampling Methods 0.000 claims abstract description 59
- 238000012545 processing Methods 0.000 claims abstract description 17
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 16
- 238000013500 data storage Methods 0.000 claims abstract description 15
- 238000004590 computer program Methods 0.000 claims description 26
- 238000007906 compression Methods 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 7
- 230000001502 supplementing effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013139 quantization Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005314 correlation function Methods 0.000 description 1
- 238000013144 data compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Images
Classifications
-
- 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
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/70—Type of the data to be coded, other than image and sound
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Navigation (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The application relates to a navigation signal generation method, a device, equipment and a storage medium. The method comprises the following steps: acquiring a digital baseband signal; the digital baseband signal comprises a carrier signal, a ranging code signal and a data code signal; generating a first digital baseband signal on a carrier signal according to quadrature modulation of a ranging code signal and a data code signal of the digital baseband signal; synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain a digital baseband signal to be compressed, and compressing the data storage format by inserting count values between adjacent sampling points according to the same amplitude value in the digital baseband signal to be compressed as the sampling points to generate a second digital baseband signal; and performing playback processing on the second digital baseband signal to generate a navigation signal. The method can solve the problem of generating navigation signals with low cost and no loss under the conditions of high sampling rate and high data volume.
Description
Technical Field
The present disclosure relates to the field of navigation technologies, and in particular, to a method, an apparatus, a device, and a storage medium for generating a navigation signal.
Background
Global satellite navigation systems (Global Navigation Satellite System, GNSS) are capable of providing all-weather precise location and time information for any location of the earth and near earth space. As a multifunctional system capable of providing high-precision, continuous, all-weather radio navigation positioning and timing services. With the development of Beidou systems in China, satellite navigation application has been widely developed in the fields of static positioning such as transportation, mapping, resource exploration and the like, high-precision time service, scientific research, satellite navigation, informatization and the like, and shows a wide industrial market space. With the great popularity of high-precision GNSS receiving apparatuses, GNSS receiving apparatuses will continue to enter into various industries. Satellite navigation user terminals (user devices) calculate carrier position and velocity by receiving navigation satellite transmitted signals to measure carrier-to-satellite distance, rate of change of distance. The receiver receives signals containing doppler shift caused by the carrier dynamics, while the signal is inevitably affected by various error sources through spatial propagation, the signal is already in a state at the receiving moment different from the state at the transmitting moment, and this difference is related to the carrier position, the motion state, the satellite spatial position, the atmosphere, etc. Satellite navigation signal analog sources are key instruments developed by satellite navigation systems and various receiving devices (particularly high dynamic receivers), and can control GNSS constellation and global (atmospheric) testing environments through a single device, so that the testing can be developed under controlled laboratory conditions. The satellite navigation signal analog source is capable of generating signals consistent with the characteristics of the signals transmitted by the GNSS satellites, so that the GNSS receiver can operate in exactly the same manner as it would process the actual satellite signals. The satellite navigation signal simulation source can generate satellite signals in various scenes, so that the satellite navigation application product can be tested, evaluated or detected in a laboratory, the influence of external environment is avoided, the field test with high cost and time consumption is greatly reduced, and the test efficiency of the satellite navigation application product is greatly improved.
However, at present, the satellite navigation signal analog source can realize lossless signal recovery at twice the sampling rate according to the nyquist sampling theorem, but this merely means that for non-overlapping signal spectrums, the lower sampling rate cannot guarantee the accuracy of the correlation peak of the navigation signal pseudo code, and if the higher sampling rate is adopted, the amount of data transmitted by the navigation signal will be greatly increased, and particularly for small-volume low-cost or acquisition playback satellite navigation signal analog sources, a larger implementation bottleneck is caused, or cost is increased.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a navigation signal generating method, apparatus, device, and storage medium that can be implemented at low cost and without loss.
A navigation signal generation method, the method comprising:
a digital baseband signal is acquired. The digital baseband signal includes a carrier signal, a ranging code signal, and a data code signal.
A first digital baseband signal is generated on a carrier signal according to quadrature modulation of a ranging code signal and a data code signal of the digital baseband signal.
And synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain a digital baseband signal to be compressed, and compressing the data storage format by inserting count values between adjacent sampling points according to the same amplitude value in the digital baseband signal to be compressed as the sampling points to generate a second digital baseband signal.
And performing playback processing on the second digital baseband signal to generate a navigation signal.
In one embodiment, the method further comprises: and acquiring satellite transmitting signals, and acquiring multiple paths of digital baseband signals according to the number of satellite transmitters.
In one embodiment, the method further comprises:
wherein ,
the generated first digital baseband signal is filtered for time t, and (2)>
For satellite numbering->
For branch I>
For the Q branch, +.>
Signal amplitude of digital baseband signal, +.>
For ranging code signal, +.>
For data code signal, ">
For the frequency of the carrier signal, < >>
Is the initial phase of the carrier signal.
In one embodiment, the ranging code signal is generated by modulo-two summation of two linear sequences of the signal ranging code in the I branch.
In one embodiment, the method further comprises: and synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain the digital baseband signal to be compressed.
Generating a baseband storage format to be compressed according to the same amplitude value in baseband data of the digital baseband signal to be compressed, selecting the amplitude value in the baseband storage format to be compressed as a sampling point, and inserting the repetition number between adjacent sampling points by a binary count value by counting the repetition number of the same amplitude value to obtain the compressed baseband storage format.
And storing the digital baseband signal to be compressed according to the compressed baseband data format to obtain a second digital baseband signal.
In one embodiment, baseband data of a digital baseband signal to be compressed includes: i-path data to be compressed and Q-path data to be compressed.
Further comprises: extracting the same amplitude value in the baseband data of the digital baseband signal to be compressed, and recombining the amplitude values according to the sequence of each I path of data to be compressed followed by one Q path of data to be compressed to obtain the baseband storage format to be compressed.
In one embodiment, the method further comprises: and reading the baseband data of the second digital baseband signal by the processor, and if the length of the I-path data character of the second digital baseband signal is smaller than that of the Q-path data character of the second digital baseband signal, supplementing 0 space for the I-path data character of the second digital baseband signal to generate a navigation signal.
A navigation signal generation apparatus, the apparatus comprising:
and the signal acquisition module is used for acquiring the digital baseband signal. The digital baseband signal includes a carrier signal, a ranging code signal, and a data code signal.
And the first digital baseband signal generation module is used for generating a first digital baseband signal on the carrier signal according to the orthogonal modulation of the ranging code signal and the data code signal of the digital baseband signal.
The second digital baseband signal generating module is used for synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain a digital baseband signal to be compressed, and generating the second digital baseband signal by inserting count values between adjacent sampling points to perform data storage format compression according to the same amplitude value in the digital baseband signal to be compressed as the sampling point.
And the navigation signal generation module is used for performing playback processing on the second digital baseband signal to generate a navigation signal.
A computer device comprising a memory storing a computer program and a processor which when executing the computer program performs the steps of:
a digital baseband signal is acquired. The digital baseband signal includes a carrier signal, a ranging code signal, and a data code signal.
A first digital baseband signal is generated on a carrier signal according to quadrature modulation of a ranging code signal and a data code signal of the digital baseband signal.
And synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain a digital baseband signal to be compressed, and compressing the data storage format by inserting count values between adjacent sampling points according to the same amplitude value in the digital baseband signal to be compressed as the sampling points to generate a second digital baseband signal.
And performing playback processing on the second digital baseband signal to generate a navigation signal.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
a digital baseband signal is acquired. The digital baseband signal includes a carrier signal, a ranging code signal, and a data code signal.
A first digital baseband signal is generated on a carrier signal according to quadrature modulation of a ranging code signal and a data code signal of the digital baseband signal.
And synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain a digital baseband signal to be compressed, and compressing the data storage format by inserting count values between adjacent sampling points according to the same amplitude value in the digital baseband signal to be compressed as the sampling points to generate a second digital baseband signal.
And performing playback processing on the second digital baseband signal to generate a navigation signal.
According to the navigation signal generation method, the navigation signal generation device, the navigation signal generation equipment and the navigation signal storage medium, the same amplitude value in the digital baseband signal is used as the sampling point, the repeated times of the same amplitude value are counted to be used as the count value, the count value is inserted between adjacent sampling points, a new data storage format is designed according to the ordering mode of the amplitude value and the count value, and further the second digital baseband signal is generated. In addition, when the second digital baseband signal is subjected to the revisit processing, the data volume is not obviously increased, and the problems of high sampling rate, high data quantization and large bit width data volume can be effectively solved, so that the navigation signal with low cost and no loss can be generated.
Drawings
FIG. 1 is an application scenario diagram of a navigation signal generation method in one embodiment;
FIG. 2 is a flow chart of a method of generating navigation signals according to an embodiment;
FIG. 3 is a schematic illustration of one embodiment
A code generator schematic;
FIG. 4 is a schematic diagram of C/A code sequence generation in one embodiment;
FIG. 5 is a schematic diagram of a baseband waveform synthesized by 8 navigation satellite signals in one embodiment, where (a) is a baseband waveform synthesized by 8 navigation satellite signals, and (b) is a sampling point with the same amplitude value;
FIG. 6 is a diagram of a baseband generated data storage format in one embodiment;
FIG. 7 is a block diagram of a navigation signal generation device in one embodiment;
fig. 8 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The navigation signal generation method and device can be applied to a navigation signal acquisition playback instrument shown in fig. 1. The system comprises a ZYNQ7015 processor, a ZYNQ7010 processor, a navigation signal acquisition and playback instrument, a navigation signal storage format compression device and a navigation signal storage format compression device, wherein the low-cost navigation signal acquisition and playback system is composed of a ZYNQ (fully programmable system on chip) FPGA (field programmable gate array) and an SSD (solid state disk).
In one embodiment, as shown in fig. 2, a navigation signal generating method is provided, and an application scenario of the method in fig. 1 is taken as an example for explanation, and the method includes the following steps:
The Beidou system satellite navigation signals comprise three signal components of carrier waves, ranging codes and data codes, navigation signals sent by a satellite transmitter are acquired through a GNSS receiver, and the navigation signals are acquired by a navigation signal acquisition playback instrument to serve as signal sources and are converted into digital baseband signals. Specifically, the digital baseband signal includes a carrier signal, a ranging code signal and a data code signal, and in addition, the data code signal is mainly a navigation message. The navigation signal collecting and playing instrument can collect navigation signals sent by the multipath satellite transmitters, and satellite coding identification can be carried out according to data codes and ranging codes of the satellite navigation signals.
The digital baseband signal is formed by carrying out quadrature modulation on a carrier by a ranging code signal and a navigation message of an I branch and a Q branch, and the first digital baseband signal is generated by:
wherein ,
the generated first digital baseband signal is filtered for time t, and (2)>
For satellite numbering->
For branch I>
For the Q branch, +.>
Signal amplitude of digital baseband signal, +.>
For ranging code signal, +.>
For data code signal, ">
For the frequency of the carrier signal, < >>
Is the initial phase of the carrier signal.
Specifically, the nominal carrier frequency of the I branch signal of the digital baseband signal is 1561.098MHz (megahertz), the transmitting signal is Quadrature Phase Shift Keying (QPSK) modulated, the signal taking mode is Code Division Multiple Access (CDMA), and the ranging code of the I branch signal of the digital baseband signal (hereinafter referred to as "ranging code" for short
Code) code rate of2.046Mcps (mega symbols per second) with a code length of 2046, as shown in FIG. 3 +.>
The code is generated by truncating 1 chip after generating a balanced Gold code (preferably a code sequence) by modulo two sums of two linear sequences G1 and G2, and the Gl and G2 sequences are generated by two 11-stage linear shift registers, respectively:
and then initial phases of the G1 sequence and the G2 sequence are respectively obtained as follows:
01010101010 initial phase of G1 sequence; 01010101010, different offsets of the G2 sequence phases can be realized by modulo-two summation of different taps of a shift register for generating the G2 sequence, and different satellites can be generated after modulo-two summation of the G1 sequence
And (5) code.
Further, according to the GPS ICD (interface control document) description, the pseudo code (CA code) transmitting generator of the digital baseband signal is formed by using 2M sequences, respectively called G1 sequence and G2 sequence, and the ranging code signal of each satellite digital baseband signal is generated by modulo 2 and (modulo-2 sum, which is an exclusive or operation (, xor ()) of the G1 sequence and the G2 sequence after a certain tap selection, which is a binary addition.
Specifically, since each M-sequence register is 10 bits, according to the nature of M-sequences, the period of G1 sequence and G2 sequence is 2≡10-1=1023, the Gold code period obtained by the modulo 2 sum operation of two sequences is 1023, that is, 1023 chips (CA Chip), and the Gold code period is 1023 chips, so that under the driving of a 1.023MHz clock, one period signal length (1023 chips) is 1ms (millisecond), that is, all 1023 chips of one period are generated every 1ms, and the duration length of each Chip is 1ms/1023≡1us (microsecond), as shown in fig. 4, 2 linear shift register sets, each register set is 10 bits, fig. 4 is the generated G1 sequence and G2 sequence, and under the control of a GPS clock, the CA clock is 1.023MHz, the output C/a code is the content of the last register of the G1 sequence and the output of the G2 sequence tap selector, that is output of the CA Chip, and the output of the CA Chip is the CA Chip, and the fast-2 is the fast-fourier transform, and the high-order signal can be obtained by the fast-fourier transform, and the fast-phase-correlation accuracy can be further improved, and the high-precision can be obtained by the fast-phase-to-correlation-and-digital-interpolation-correlation-function.
Furthermore, a navigation receiver in the navigation signal acquisition and playback instrument obtains the signal arrival time by measuring the correlation peak position of the pseudo code of the first digital baseband signal, and the navigation precision is directly determined due to the accuracy of the correlation peak position, and the digital baseband signal to be compressed is obtained by synthesizing the I-path data and the Q-path data of the first digital baseband signal. Generating a storage format of a baseband to be compressed according to the same amplitude value in the baseband data of the digital baseband signal to be compressed, extracting the same amplitude value in the baseband data of the digital baseband signal to be compressed, taking the same amplitude value as a sampling point, wherein the same amplitude value can be the amplitude value of I-path data or the amplitude value of Q-path data, so that a plurality of I-path same amplitude values and a plurality of Q-path same amplitude values are obtained, the repetition number is represented by a binary count value through counting the repetition number of the same amplitude values, and the count value is correspondingly inserted between different amplitude values. Specifically, according to an I-path data and a binary count value corresponding to the I-path data, a Q-path data and a compression storage format of the binary count value corresponding to the Q-path data are followed to obtain a compression baseband storage format, and then an interface is stored in an SSD in a navigation signal acquisition playback instrument according to the compression baseband storage format by a run-length encoding compression method to obtain a second digital baseband signal.
And step 208, performing playback processing on the second digital baseband signal to generate a navigation signal.
And reading the baseband data of the second digital baseband signal through a processor, if the length of the I-path data character of the second digital baseband signal is smaller than that of the Q-path data character of the second digital baseband signal, supplementing 0 space for the I-path data character of the second digital baseband signal, performing playback processing on the second digital baseband signal through an AD9364 in a navigation signal acquisition playback instrument, enabling the second digital baseband signal to enter an FPGA PL processing part, decompressing and recovering data to the original sampling rate according to an interface format, generating a navigation signal, and outputting the generated navigation signal through a radio frequency line.
In the navigation signal generating method, the same amplitude value in the digital baseband signal is used as the sampling point, the repeated times of the same amplitude value are counted as the count value, the count value is inserted between adjacent sampling points, a new data storage format is designed according to the ordering mode of the amplitude value and the count value, and then a second digital baseband signal is generated. In addition, when the second digital baseband signal is subjected to the revisit processing, the data volume is not obviously increased, and the problems of high sampling rate, high data quantization and large bit width data volume can be effectively solved, so that the navigation signal with low cost and no loss can be generated.
In one of the embodiments of the present invention,
wherein ,
the generated first digital baseband signal is filtered for time t, and (2)>
For satellite numbering->
For branch I>
For the Q branch, +.>
Signal amplitude of digital baseband signal, +.>
For ranging code signal, +.>
For data code signal, ">
For the frequency of the carrier signal, < >>
Is the initial phase of the carrier signal. />
In one embodiment, the ranging code signal is generated by modulo-two summation of two linear sequences of the signal ranging code in the I branch.
It should be noted that, by modulo-two summation of different taps of the shift register for generating G2 sequence, different offsets of G2 sequence phases can be realized, and different satellites can be generated after modulo-two summation with G1 sequence
Codes, by which the navigation signals of different satellites can be identified.
In one embodiment, the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal are synthesized to obtain the digital baseband signal to be compressed. Generating a baseband storage format to be compressed according to the same amplitude value in baseband data of the digital baseband signal to be compressed, selecting the amplitude value in the baseband storage format to be compressed as a sampling point, and inserting the repetition number between adjacent sampling points by a binary count value by counting the repetition number of the same amplitude value to obtain the compressed baseband storage format. And storing the digital baseband signal to be compressed according to the compressed baseband data format to obtain a second digital baseband signal.
It should be noted that, as shown in fig. 5 (a) and fig. 5 (b), when the baseband waveforms synthesized by 8 paths of navigation satellite signals are observed, the observation details can find that a large number of repeated sampling points with the same amplitude exist in the signals, and the sampling points with the same amplitude values, which are arranged along a certain direction, in the navigation baseband signals synthesized by the I paths and the Q paths of first digital baseband signals can be regarded as continuous sampling points, and the continuous sampling points are replaced by numbers, so that when the baseband digital signal data to be compressed is encoded, adjacent sampling points with the same amplitude values of the baseband digital signal to be compressed are replaced by one count value and the amplitude values of the sampling points, and the data quantity can be greatly reduced. Therefore, the method has the advantages of higher compression efficiency, easiness in searching, superposition merging and other operations, simplicity in operation, suitability for machine storage capacity reduction, large data compression, and capability of avoiding the condition that complicated encoding and decoding operations increase processing and operation time.
In one embodiment, baseband data of a digital baseband signal to be compressed includes: i-path data to be compressed and Q-path data to be compressed. Extracting the same amplitude value in the baseband data of the digital baseband signal to be compressed, and recombining the amplitude values according to the sequence of each I path of data to be compressed followed by one Q path of data to be compressed to obtain the baseband storage format to be compressed.
It should be noted that, for the navigation baseband signal synthesized by the plurality of navigation satellite signals, the transmission and storage compression rates of the navigation satellite signals generated by the compression method are different from 5 times to 30 times.
In one embodiment, the data of the baseband data of the second digital baseband signal is read by the processor, and if the length of the I-way data character of the second digital baseband signal is smaller than the length of the Q-way data character of the second digital baseband signal, the I-way data character of the second digital baseband signal is subjected to 0-filling occupation to generate the navigation signal.
In one embodiment, as shown in fig. 6, a navigation signal is generated with a sampling rate of 40MHz, for I, Q two signals, each with an 8bit resolution, the amount of transmission data is 40×8×2Mbps (megabits per second) =640 Mbps, and the I/Q-path storage format of the digital baseband signal to be compressed is: the I path and the Q path respectively follow the repetition times of the I path and the Q path data, (without the transmitted data of the I path and the Q path), and the generated compressed baseband storage format is as follows:
the I/Q path to-be-compressed baseband storage format of the obtained to-be-compressed digital baseband signal is as follows
OxA0 A0 A0 A0 F2 F2 F2 F2 F2 B1 B1 06 06 03 06 05 05 05，
After compression, the stored compressed baseband storage format is:
0xA0 01 A0 01 F2 02 F2 01 B1 00 B1 00 06 01 06 00 05 00 03 00 00 00 05 01。
in one embodiment, as shown in fig. 1, a low-cost navigation signal acquisition and playback system formed by a ZYNQ FPGA and an SSD is adopted, navigation digital baseband signal original data is generated according to a 40MHz sampling rate, then the navigation digital baseband signal original data is stored in the SSD according to the interface format by a run-length coding compression method, the ARM of the ZYNQ7015 reads the run-length coding compressed data, the data rate is about 5Mbps, the run-length coding compressed data enters an FPGA PL processing part to decompress recovery data according to the interface format to a 40MHz sampling rate, and the recovery data is sent to a digital-analog converter (DAC) and an up-conversion module to output the generated navigation signal with a high sampling rate.
It should be understood that, although the steps in the flowcharts of fig. 1-2 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1-2 may include multiple sub-steps or phases that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or phases are performed necessarily occur sequentially, but may be performed alternately or alternately with at least a portion of the sub-steps or phases of other steps or other steps.
In one embodiment, as shown in fig. 7, there is provided a navigation signal generating apparatus including: a signal acquisition module 702, a first digital baseband signal generation module 704, a second digital baseband signal generation module 706, and a navigation signal generation module 708, wherein:
the signal acquisition module 702 is configured to acquire a digital baseband signal. The digital baseband signal includes a carrier signal, a ranging code signal, and a data code signal.
The first digital baseband signal generating module 704 is configured to generate a first digital baseband signal on a carrier signal according to quadrature modulation of a ranging code signal and a data code signal of the digital baseband signal.
The second digital baseband signal generating module 706 is configured to synthesize the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain a digital baseband signal to be compressed, and compress a data storage format by inserting count values between adjacent sampling points according to the same amplitude value in the digital baseband signal to be compressed as a sampling point, so as to generate the second digital baseband signal.
The navigation signal generating module 708 is configured to perform playback processing on the second digital baseband signal, and generate a navigation signal.
For specific limitations of the navigation signal generating device, reference may be made to the above limitations of the navigation signal generating method, and no further description is given here. The respective modules in the navigation signal generating apparatus described above may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 8. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a navigation signal generation method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structures shown in fig. 7-8 are block diagrams of only some of the structures that are relevant to the present application and are not intended to limit the computer device on which the present application may be implemented, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory storing a computer program and a processor that when executing the computer program performs the steps of:
a digital baseband signal is acquired. The digital baseband signal includes a carrier signal, a ranging code signal, and a data code signal.
A first digital baseband signal is generated on a carrier signal according to quadrature modulation of a ranging code signal and a data code signal of the digital baseband signal.
And synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain a digital baseband signal to be compressed, and compressing the data storage format by inserting count values between adjacent sampling points according to the same amplitude value in the digital baseband signal to be compressed as the sampling points to generate a second digital baseband signal.
And performing playback processing on the second digital baseband signal to generate a navigation signal.
In one embodiment, the processor when executing the computer program further performs the steps of: and acquiring satellite transmitting signals, and acquiring multiple paths of digital baseband signals according to the number of satellite transmitters.
In one embodiment, the processor when executing the computer program further performs the steps of:
wherein ,
the generated first digital baseband signal is filtered for time t, and (2)>
For satellite numbering->
For branch I>
For the Q branch, +.>
Signal amplitude of digital baseband signal, +.>
For ranging code signal, +.>
For data code signal, ">
For the frequency of the carrier signal, < >>
Is the initial phase of the carrier signal.
In one embodiment, the processor when executing the computer program further performs the steps of: the ranging code signal is generated by performing mode two sum on the signal ranging code of the I branch through two linear sequences.
In one embodiment, the processor when executing the computer program further performs the steps of: and synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain the digital baseband signal to be compressed. Generating a baseband storage format to be compressed according to the same amplitude value in baseband data of the digital baseband signal to be compressed, selecting the amplitude value in the baseband storage format to be compressed as a sampling point, and inserting the repetition number between adjacent sampling points by a binary count value by counting the repetition number of the same amplitude value to obtain the compressed baseband storage format. And storing the digital baseband signal to be compressed according to the compressed baseband data format to obtain a second digital baseband signal.
In one embodiment, the processor when executing the computer program further performs the steps of: the baseband data of the digital baseband signal to be compressed comprises: i-path data to be compressed and Q-path data to be compressed.
Extracting the same amplitude value in the baseband data of the digital baseband signal to be compressed, and recombining the amplitude values according to the sequence of each I path of data to be compressed followed by one Q path of data to be compressed to obtain the baseband storage format to be compressed.
In one embodiment, the processor when executing the computer program further performs the steps of: and reading the baseband data of the second digital baseband signal by the processor, and if the length of the I-path data character of the second digital baseband signal is smaller than that of the Q-path data character of the second digital baseband signal, supplementing 0 space for the I-path data character of the second digital baseband signal to generate a navigation signal.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
a digital baseband signal is acquired. The digital baseband signal includes a carrier signal, a ranging code signal, and a data code signal.
A first digital baseband signal is generated on a carrier signal according to quadrature modulation of a ranging code signal and a data code signal of the digital baseband signal.
And synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain a digital baseband signal to be compressed, and compressing the data storage format by inserting count values between adjacent sampling points according to the same amplitude value in the digital baseband signal to be compressed as the sampling points to generate a second digital baseband signal.
And performing playback processing on the second digital baseband signal to generate a navigation signal.
In one embodiment, the computer program when executed by the processor further performs the steps of: and acquiring satellite transmitting signals, and acquiring multiple paths of digital baseband signals according to the number of satellite transmitters.
In one embodiment, the computer program when executed by the processor further performs the steps of:
wherein ,
the generated first digital baseband signal is filtered for time t, and (2)>
For satellite numbering->
For branch I>
For the Q branch, +.>
Signal amplitude of digital baseband signal, +.>
For ranging code signal, +.>
For data code signal, ">
For the frequency of the carrier signal, < >>
Is the initial phase of the carrier signal.
In one embodiment, the computer program when executed by the processor further performs the steps of: the ranging code signal is generated by performing mode two sum on the signal ranging code of the I branch through two linear sequences.
In one embodiment, the computer program when executed by the processor further performs the steps of: and synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain the digital baseband signal to be compressed. Generating a baseband storage format to be compressed according to the same amplitude value in baseband data of the digital baseband signal to be compressed, selecting the amplitude value in the baseband storage format to be compressed as a sampling point, and inserting the repetition number between adjacent sampling points by a binary count value by counting the repetition number of the same amplitude value to obtain the compressed baseband storage format. And storing the digital baseband signal to be compressed according to the compressed baseband data format to obtain a second digital baseband signal.
In one embodiment, the computer program when executed by the processor further performs the steps of: the baseband data of the digital baseband signal to be compressed comprises: i-path data to be compressed and Q-path data to be compressed.
Extracting the same amplitude value in the baseband data of the digital baseband signal to be compressed, and recombining the amplitude values according to the sequence of each I path of data to be compressed followed by one Q path of data to be compressed to obtain the baseband storage format to be compressed.
In one embodiment, the computer program when executed by the processor further performs the steps of: and reading the baseband data of the second digital baseband signal by the processor, and if the length of the I-path data character of the second digital baseband signal is smaller than that of the Q-path data character of the second digital baseband signal, supplementing 0 space for the I-path data character of the second digital baseband signal to generate a navigation signal.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and detail, but are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A navigation signal generation method, the method comprising:
acquiring a digital baseband signal; the digital baseband signal comprises a carrier signal, a ranging code signal and a data code signal;
generating a first digital baseband signal on the carrier signal according to quadrature modulation of the ranging code signal and the data code signal of the digital baseband signal;
synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain a digital baseband signal to be compressed, and generating a second digital baseband signal by performing data storage format compression on count values inserted between adjacent sampling points according to the same amplitude value in the digital baseband signal to be compressed as the sampling points;
and performing playback processing on the second digital baseband signal to generate a navigation signal.
2. The method of claim 1, wherein acquiring the digital baseband signal comprises:
and acquiring satellite transmitting signals, and acquiring multiple paths of digital baseband signals according to the number of satellite transmitters.
3. The method of claim 2, wherein generating a first digital baseband signal on the carrier signal based on quadrature modulation of the ranging code signal and the data code signal of the digital baseband signal comprises:
wherein ,
the generated first digital baseband signal is filtered for time t, and (2)>
For satellite numbering->
For branch I>
For the Q branch, the phase difference is,
signal amplitude of digital baseband signal, +.>
For ranging code signal, +.>
For data code signal, ">
For the frequency of the carrier signal, < >>
Is the initial phase of the carrier signal.
4. A method according to claim 3, wherein the ranging code signal is generated by modulo-two summation of two linear sequences of the signal ranging code in the I branch.
5. The method of claim 4, wherein synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain a digital baseband signal to be compressed, and generating a second digital baseband signal by inserting count values between adjacent sampling points as sampling points according to the same amplitude value in the digital baseband signal to be compressed as the sampling points in a data storage format includes:
synthesizing the I path data of the first digital baseband signal and the Q path data of the first digital baseband signal to obtain a digital baseband signal to be compressed;
generating a baseband storage format to be compressed according to the same amplitude value in baseband data of the digital baseband signal to be compressed, selecting the amplitude value in the baseband storage format to be compressed as a sampling point, and inserting the repetition number between adjacent sampling points by counting the repetition number of the same amplitude value to obtain a compressed baseband storage format;
and storing the digital baseband signal to be compressed according to the compressed baseband data format to obtain a second digital baseband signal.
6. The method of claim 5, wherein the baseband data of the digital baseband signal to be compressed comprises: i-path data to be compressed and Q-path data to be compressed;
generating a baseband storage format to be compressed according to the same amplitude value in the baseband data of the digital baseband signal to be compressed, including:
extracting the same amplitude value in the baseband data of the digital baseband signal to be compressed, and recombining the amplitude values according to the sequence of each I path of data to be compressed followed by one Q path of data to be compressed to obtain the baseband storage format to be compressed.
7. The method of claim 6, wherein playing back the second digital baseband signal to generate a navigation signal comprises:
and reading the baseband data of the second digital baseband signal by a processor, and if the length of the I-path data character of the second digital baseband signal is smaller than that of the Q-path data character of the second digital baseband signal, carrying out 0-supplementing occupation on the I-path data character of the second digital baseband signal to generate a navigation signal.
8. A navigation signal generating apparatus, the apparatus comprising:
the signal acquisition module is used for acquiring a digital baseband signal; the digital baseband signal comprises a carrier signal, a ranging code signal and a data code signal;
the first digital baseband signal generation module is used for generating a first digital baseband signal on a carrier signal according to the orthogonal modulation of a ranging code signal and a data code signal of the digital baseband signal;
the second digital baseband signal generating module is used for synthesizing the I-path data of the first digital baseband signal and the Q-path data of the first digital baseband signal to obtain a digital baseband signal to be compressed, and generating a second digital baseband signal by inserting count values between adjacent sampling points to perform data storage format compression according to the same amplitude value in the digital baseband signal to be compressed as the sampling points;
and the navigation signal generation module is used for performing playback processing on the second digital baseband signal to generate a navigation signal.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310352407.XA CN116125502B (en) | 2023-04-04 | 2023-04-04 | Navigation signal generation method, device, equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310352407.XA CN116125502B (en) | 2023-04-04 | 2023-04-04 | Navigation signal generation method, device, equipment and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116125502A true CN116125502A (en) | 2023-05-16 |
| CN116125502B CN116125502B (en) | 2023-06-27 |
Family
ID=86299370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310352407.XA Active CN116125502B (en) | 2023-04-04 | 2023-04-04 | Navigation signal generation method, device, equipment and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116125502B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117406249A (en) * | 2023-12-14 | 2024-01-16 | 成都安则优科技有限公司 | Anti-unmanned aerial vehicle satellite navigation equipment and data playback method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060251173A1 (en) * | 2005-05-06 | 2006-11-09 | Hansheng Wang | Efficient and flexible GPS receiver baseband architecture |
| US20130127663A1 (en) * | 2011-11-18 | 2013-05-23 | Electronics And Telecommunications Research Institute | Apparatus and method for generating satellite navigation signal based on software |
| CN103954978A (en) * | 2014-04-15 | 2014-07-30 | 北京航空航天大学 | Novel dynamic navigation signal source implementation method based on PIX structure |
| US20150372711A1 (en) * | 2013-03-07 | 2015-12-24 | Huawei Technologies Co., Ltd. | Data compression method, data restoration method, apparatuses, and system |
| DE102019215206A1 (en) * | 2019-09-09 | 2021-03-11 | Robert Bosch Gmbh | FMCW radar sensor with synchronized high-frequency components |
| CN113242264A (en) * | 2021-07-09 | 2021-08-10 | 中国人民解放军国防科技大学 | Method and system for compressing and storing large-capacity data |
| CN114035209A (en) * | 2021-11-03 | 2022-02-11 | 湖南国天电子科技有限公司 | Satellite navigation signal model design calculation method |
-
2023
- 2023-04-04 CN CN202310352407.XA patent/CN116125502B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060251173A1 (en) * | 2005-05-06 | 2006-11-09 | Hansheng Wang | Efficient and flexible GPS receiver baseband architecture |
| US20130127663A1 (en) * | 2011-11-18 | 2013-05-23 | Electronics And Telecommunications Research Institute | Apparatus and method for generating satellite navigation signal based on software |
| US20150372711A1 (en) * | 2013-03-07 | 2015-12-24 | Huawei Technologies Co., Ltd. | Data compression method, data restoration method, apparatuses, and system |
| CN103954978A (en) * | 2014-04-15 | 2014-07-30 | 北京航空航天大学 | Novel dynamic navigation signal source implementation method based on PIX structure |
| DE102019215206A1 (en) * | 2019-09-09 | 2021-03-11 | Robert Bosch Gmbh | FMCW radar sensor with synchronized high-frequency components |
| CN113242264A (en) * | 2021-07-09 | 2021-08-10 | 中国人民解放军国防科技大学 | Method and system for compressing and storing large-capacity data |
| CN114035209A (en) * | 2021-11-03 | 2022-02-11 | 湖南国天电子科技有限公司 | Satellite navigation signal model design calculation method |
Non-Patent Citations (1)
| Title |
|---|
| 王华 等: "一种基于现场可编程门阵列的卫星导航信号生成方法", 导航定位学报, no. 04 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117406249A (en) * | 2023-12-14 | 2024-01-16 | 成都安则优科技有限公司 | Anti-unmanned aerial vehicle satellite navigation equipment and data playback method |
| CN117406249B (en) * | 2023-12-14 | 2024-03-08 | 成都安则优科技有限公司 | Anti-unmanned aerial vehicle satellite navigation equipment and data playback method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116125502B (en) | 2023-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES2230620T3 (en) | ACQUISITION IN A GPS RECEIVER. | |
| CN116125502B (en) | Navigation signal generation method, device, equipment and storage medium | |
| CN101802634B (en) | Gnss signal processor | |
| US7898475B2 (en) | GNSS receiver with reduced storage requirements | |
| CN112444830B (en) | Compressed sensing GNSS signal capturing method based on singular value decomposition | |
| US20080162519A1 (en) | Apparatus and method using compressed codes for comprising latitude/longitude information | |
| CN101310192A (en) | Sample sequence processing signals | |
| CN106019343A (en) | System and method for generating satellite navigation signal based on Chirp signal | |
| CN111694029A (en) | Hardware implementation method for generating B1C signal pseudo-random noise code | |
| CN103792552A (en) | System and method for generating satellite navigation baseband signal | |
| JP2011024211A (en) | Method and device for receiving signal | |
| Grenier et al. | A survey on low-power gnss | |
| JP2009519448A (en) | Signal processing apparatus and signal processing method | |
| CN109557568B (en) | Ranging code generation method and device | |
| CN1837847A (en) | Receiving device and signal demodulating method | |
| US7558312B2 (en) | Parallel correlator implementation using block integration for spread-spectrum communication | |
| JP2001517397A (en) | Code synchronization apparatus and method | |
| EP3642965B1 (en) | System-on-a-chip for reception of telemetry messages over a radio frequency channel | |
| CN105699990B (en) | A kind of carrier tracking loop and tracking of GNSS small-signals | |
| FI122637B (en) | Signal processing method, device and system | |
| KR100392137B1 (en) | Acquisition method and device for carrying out said method | |
| CN110376619B (en) | Signal processing device in global navigation satellite system | |
| CN113031026A (en) | Ranging code generation method, device, equipment and storage medium | |
| US20100166121A1 (en) | Methods and apparatus for receiver having fast walsh transform | |
| US7590828B2 (en) | Processing a data word in a plurality of processing cycles |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |