CN105223594A - Multifrequency point, quick position navigation satellite signal baseband processing circuitry - Google Patents
Multifrequency point, quick position navigation satellite signal baseband processing circuitry Download PDFInfo
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- CN105223594A CN105223594A CN201510754481.XA CN201510754481A CN105223594A CN 105223594 A CN105223594 A CN 105223594A CN 201510754481 A CN201510754481 A CN 201510754481A CN 105223594 A CN105223594 A CN 105223594A
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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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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- Radar, Positioning & Navigation (AREA)
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- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a kind of multifrequency point, quick position navigation satellite signal baseband processing circuitry, comprise power module, AD conversion unit, digital signal processing unit, interface module, power module is used for providing corresponding power rail to each module, AD conversion unit comprises wave filter, first AD conversion module and the second AD conversion module, described first AD conversion module and the second AD conversion module all include hyperchannel AD converter, after the satellite-signal of different frequency range is converted to digital signal by the first AD conversion module and the second AD conversion module respectively, supplied with digital signal processing module respectively.The present invention realizes making Base-Band Processing to different navigation satellite-signal by multiple passage, thus improves navigation and positioning accuracy.The invention also discloses a kind of navigation chip comprising above-mentioned multifrequency point, quick position navigation satellite signal baseband processing circuitry, the processing capacity of its compatible different satellite navigation system, not only registration, and low cost of manufacture.
Description
Technical field
The present invention relates to satellite navigation positioning technical field, be specifically related to a kind of multifrequency point, quick position navigation satellite signal baseband processing circuitry and navigation chip.
Background technology
Have four worldwide navigation positioning system GNSS(GlobalNavigationSatelliteSystem in the world at present): first is the gps system of the U.S., its rf frequency is 1575.42MHz, bandwidth is 2.046MHz, contains the C/A code of time and positional information in bandwidth; Second is the GLONASS system of Russia, and its rf frequency is 1598.0625MHz to 1605.375MHz, and bandwidth is 8MHz, is divided into 14 channels, and the interval of channel and channel is 0.5625MHz, and the bandwidth of each channel is 0.5625MHz; 3rd is the COMPASS system of Chinese Beidou II, and its rf frequency is 1561.098MHz, and bandwidth is 4.092MHz; 4th is Galileo (Galileo) system of European Union, and its rf frequency is 1575.42MHz, and bandwidth is 4.092MHz.
Meanwhile, Japan, India, in order to meet national navigator fix demand for services further, make full use of the GPS run, step up the region satellite navigation system researching and developing oneself.The demand that Japan serves navigator fix in order to the user of satisfied flight service area and the easy blocked area of signal, stepping up to develop the satellite-based augmentation system (MSAS) based on multisatellite and accurate zenith satellite navigation system (QZSS), two region satellite navigation systems are mainly through strengthening GPS to meet consumers' demand.Two satellite navigation systems that India is is researching and developing are the area navigation satellite system (IRNSS) of independently building based on auxiliary GPS enhanced navigation (GAGAN) system of GEO and India respectively; GAGAN mainly carries out wide area differential enhancing to GPS, and IRNSS is the independent satellite navigation system of India, both can provide independently navigator fix service, and GPS also can be provided to strengthen information.
Along with the development of Global Navigation System, worldwide navigation positioning system is tending towards variation, each navigation positioning system all has himself strong and weak points, in addition the impact of region is used, simple a kind of navigation positioning system often on some time, place precision can not meet consumers' demand, need to consider mutual for the result of different navigation positioning system reference, to can complementary effect be played for this reason.The multimode navigation satellite signal receiver (hereinafter referred to as receiver) of current use, mostly be different navigation chip is incorporated in a receiver, thus obtain the result of different navigation positioning system, because navigation chip is expensive, different navigation chip is incorporated in a receiver, adds the manufacturing cost of receiver undoubtedly.
Summary of the invention
For above-mentioned the deficiencies in the prior art part, the present invention makes improvements prior art, a kind of multifrequency point, quick position navigation satellite signal baseband processing circuitry are provided, realize making Base-Band Processing to different navigation satellite-signal by multiple passage, thus make to comprise the ability that navigation chip of the present invention possesses process different navigation satellite-signal, make navigator fix more accurate, solve the compatible poor performance of prior art navigation chip and the high technical matters of multimode navigation satellite manufacturing cost.
Object of the present invention is achieved through the following technical solutions:
A kind of multifrequency point, quick position navigation satellite signal baseband processing circuitry, comprise power module, AD conversion unit, digital signal processing unit, interface module, described power module provides corresponding power rail to each unit or module, described AD conversion unit receives the analog intermediate frequency signal that prime radio frequency unit exports, the output terminal of AD conversion unit is connected with the input end of digital signal processing unit, and interface module and digital processing element are bi-directionally connected.
Described AD conversion unit comprises wave filter, first AD conversion module and the second AD conversion module, the input end of described wave filter is connected with radio frequency processing module output terminal, the output terminal of wave filter connects the input end of the first AD conversion module and the input end of the second AD conversion module respectively, described first AD conversion module and the second AD conversion module all include hyperchannel AD converter, the satellite-signal of GPS and GLONASS is converted to digital signal by the first AD conversion module, Big Dipper satellite signal is converted to digital signal by the second AD conversion module, both supplied with digital signal processing modules.
Power module, according to other module self-demand of the present invention, provides and meets the power rail of other module to power supply ripple and noise requirements, for the normal work of other module is powered, ensures that each module stability of the present invention runs.Navigation satellite signal, after receiver antenna gathers, is converted into analog intermediate frequency signal by the radio frequency unit of prime, and sends into above-mentioned AD conversion unit.Analog intermediate frequency signal, after wave filter elimination clutter, inputs the first AD conversion module and the second AD conversion module respectively.Hyperchannel AD converter in first AD conversion module and the second AD conversion module, by different passage, the navigation satellite signal of different frequency range is converted to digital signal, and exporting the signal transacting such as digital signal processing unit carries out analyzing, demodulation to, result is exported by interface module.Second AD conversion module is the analog to digital converter composition of 16 precision, 80MSPS, Big Dipper satellite signal is converted to digital signal, coordinates the UTC time that RTC module provides, for high precision, the quick position realizing Big Dipper satellite signal provides safeguard.The present invention makes analog to digital conversion by multiple passage to different navigation satellite-signal, the navigation satellite signal of different frequent points can be processed, can be complementary by the positioning result of different navigation positioning system, make it locate more accurate, and circuit structure of the present invention is simple, cost of manufacture is lower.
Further, the hyperchannel AD converter that described first AD conversion module and the second AD conversion module all comprise is the analog to digital converter of 16 precision, slewing rate is chosen as 80MSPS, make the first AD conversion module and the second AD conversion module possess stronger interference free performance, more a step strengthens accuracy of the present invention.
Further, also comprise back-up source module, when external power source power down being detected, continue as the power supply supply that each module or unit provide a period of time, detect prime radio frequency unit whether to work simultaneously, if radio frequency unit is working properly, then proceed location, navigation work, if radio frequency unit does not work, then carry out information preservation and standby a period of time.
Further, also comprise RTC module, RTC module provides UTC clock for digital signal processing unit, when outside power supply power-fail, RTC module can continue timing, and when external power source powers on, RTC module provides UTC clock, digital signal processing unit is enable in 4 seconds, to carry out the location of military dimension accuracy, i.e. fast positioning function.
Further, described digital signal processing unit comprises FPGA module and DSP module, is bi-directionally connected between described FPGA module and DSP module.Through the digital signal that the first AD conversion module or the second AD conversion module are changed, undertaken calculating by FPGA module, the process such as analysis, realize the function such as task management, Row control to FPGA module by DSP module simultaneously, thus achieve digital signal processing unit to the catching of the satellite-signals such as BD2/GPS/GLONASS, follow the tracks of, textual information solution is in harmonious proportion location, velocity calculated, and result is carried out speedy carding process.Realize the major function to navigation satellite signal Base-Band Processing by FPGA module and DSP module, it is convenient to optimum configurations to module each in the present invention, amendment and system upgrade, and processing procedure is reliable and stable, and power consumption is little, is conducive to integrated.
Further, above-mentioned multifrequency point, quick position navigation satellite signal baseband processing circuitry also comprise ARM module, described ARM module output terminal is connected with DSP module input end, and ARM module comprises abnormal patterns, for monitoring the duty of digital signal processing unit.ARM module plays supervisory function bit to digital signal processing unit, when there are abnormal conditions in FPGA module and DSP module work, the abnormal patterns of ARM module just sends reset signal to DSP module, DSP module is according to the duty of this reset signal management FPGA, make digital signal processing unit recover normal operating conditions, thus ensure stable operation of the present invention.In addition, when needs are standby, the upper and lower electric control of ARM module in charge management DSP module and FPGA module, reduces power consumption of the present invention, prolongs standby time.
Further, the output terminal of described ARM module is also connected with the control end of power rail each in power module, the electrifying timing sequence of each power rail is controlled by ARM module, control startup and the shutoff of other each module, thus saving energy consumption, and the electrifying timing sequence of power rail is controlled by ARM module, its control accuracy is higher, ensures stability of the present invention further.
Further, also comprise security module, described security module and FPGA module are bi-directionally connected, and for participating in resolving of high precision Big Dipper satellite signal, when participating in powering on simultaneously, carrying out Big Dipper satellite signal positioning work fast, realizing other navigation accuracy of army grade.
Further, above-mentioned multifrequency point, quick position navigation satellite signal baseband processing circuitry, interface module described in it comprises LVDS bus, adopt LVDS bus transfer data, instead of conventional serial interface transmission, realize the transfer rate reaching as high as 600Mb/s, the present invention possesses RS422 serial ports simultaneously, can realize the high level matches with low level of data transmission.
Further, above-mentioned multifrequency point, quick position navigation satellite signal baseband processing circuitry also comprise clock module, the output terminal of described clock module accesses AD conversion unit and digital signal processing unit respectively, clock module receives prime radio frequency list without the fundamental clock sent here, the clock signal different according to the Buffer fan-out of different clocks, ensures that the amplitude of clock signal, frequency, waveform meet the demands simultaneously.
The present invention compared with prior art, has following advantage and beneficial effect:
(1) the present invention utilizes multiple passage correspondence to receive, change the navigation satellite signal of different frequent points, comprises the BD2 system, the gps system of the U.S., Muscovite GLONASS system etc. of China, can be complimentary to one another, expands usable range and positioning precision;
(2) the present invention adopts the multipath A/D converter of 16 precision, its good in anti-interference performance, and location is comparatively accurate, simultaneously for adopting Big Dipper Anti-interference algorithm to realize supporting;
(3) in the present invention to satellite-signal calculation result, adopt multibus transmission data, there is transfer rate up to the LVDS bus of 600Mb/s and traditional RS422 serial ports simultaneously, thus realize interface module high level matches with low level.
(4) back-up source module is possessed in the present invention, can when outside power supply power-fail, continuous firing a period of time.
(3) possess RTC module in the present invention, the accurate UTC time can be provided, can not satellite time transfer be needed, carry out quick position.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide the further understanding to the embodiment of the present invention, forms a application's part, does not form the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the theory diagram of one embodiment of the present invention.
Embodiment
Clearly understand for making the object, technical solutions and advantages of the present invention, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and exemplary embodiment of the present invention and explanation thereof are only for explaining the present invention, not as a limitation of the invention.
Embodiment 1:
As shown in Figure 1, a kind of multifrequency point, quick position navigation satellite signal baseband processing circuitry, comprise power module, AD conversion unit, digital signal processing unit, interface module, power module is used for providing corresponding power rail to each unit or module, AD conversion unit receives the analog intermediate frequency signal that prime radio frequency unit exports, the output terminal of AD conversion unit is connected with the input end of digital signal processing unit, and interface module and digital processing element are bi-directionally connected.
AD conversion unit comprises wave filter, the first AD conversion module and the second AD conversion module, the input end of wave filter is connected with radio frequency processing module output terminal, the output terminal of wave filter connects the input end of the first AD conversion module and the input end of the second AD conversion module respectively, first AD conversion module and the second AD conversion module all include hyperchannel AD converter, the satellite-signal of GPS and GLONASS is converted to digital signal by the first AD conversion module, Big Dipper satellite signal is converted to digital signal by the second AD conversion module, and both distinguish supplied with digital signal processing module.
Power module, according to other module self-demand of the present invention, provides and meets the power rail of other module to power supply ripple and noise requirements, for the normal work of other module is powered, ensures that each module stability of the present invention runs.Navigation satellite signal, after receiver antenna gathers, is converted into analog intermediate frequency signal by the radio frequency unit of prime, and sends into above-mentioned AD conversion unit.Analog intermediate frequency signal, after wave filter elimination clutter, inputs the first AD conversion module and the second AD conversion module respectively.Hyperchannel AD converter in first AD conversion module and the second AD conversion module, by different passage, the navigation satellite signal of different frequency range is converted to digital signal, and exporting the signal transacting such as digital signal processing unit carries out analyzing, demodulation to, result is exported by interface module.Second AD conversion module is the analog to digital converter composition of 16 precision, 80MSPS, Big Dipper satellite signal is converted to digital signal, coordinates the UTC time that RTC module provides, for high precision, the quick position realizing Big Dipper satellite signal provides safeguard.The present invention makes analog to digital conversion by multiple passage to different navigation satellite-signal, the navigation satellite signal of different frequent points can be processed, can be complementary by the positioning result of different navigation positioning system, make it locate more accurate, and circuit structure of the present invention is simple, cost of manufacture is lower.
Embodiment 2:
As shown in Figure 1, the present embodiment, on the basis of embodiment 1, is optimized further.Concrete, the first AD conversion module and the second AD conversion module all comprise hyperchannel AD converter, the analog to digital converter of optional 16 precision, 80MSPS slewing rate, to strengthen the interference free performance that the first AD conversion module and the second AD conversion module possess.
Digital signal processing unit comprises FPGA module and DSP module, is bi-directionally connected between FPGA module and DSP module.Analog intermediate frequency signal is converted to digital signal through the first AD conversion module or the second AD conversion module, by FPGA module calculating, analysis etc., DSP module realizes the function such as task management, Row control to FPGA module simultaneously, thus achieve digital signal processing unit to the catching of the satellite-signals such as BD2/GPS/GLONASS, follow the tracks of, textual information solution is in harmonious proportion location, velocity calculated, and result is carried out speedy carding process.For protecting the program of FPGA module to read, in case be mixed into criminal manipulation, arrange a security module in the present embodiment, security module and FPGA module are bi-directionally connected, to ensure the operation that the present invention is reliable and stable.
In the present embodiment, realize the major function to navigation satellite signal Base-Band Processing by FPGA module and DSP module, it is convenient to optimum configurations to module each in the present invention, amendment and system upgrade, and processing procedure is reliable and stable, power consumption is little, is conducive to integrated.
Embodiment 3:
The present embodiment is preferably as follows on the basis of any one embodiment above-mentioned: also comprise back-up source module, when external power source power down being detected, continue as the power supply supply that each module or unit provide a period of time, detect prime radio frequency unit whether to work simultaneously, if radio frequency unit is working properly, then proceed location, navigation work, if radio frequency unit does not work, then carry out information preservation and standby a period of time.
Embodiment 4:
The present embodiment is preferably as follows on the basis of any one embodiment above-mentioned: also comprise RTC module, RTC module provides UTC clock for digital signal processing unit, when outside power supply power-fail, RTC module can continue timing, when external power source powers on, RTC module provides UTC clock, enables digital signal processing unit in 4 seconds, carry out the location of military dimension accuracy, i.e. fast positioning function.
Embodiment 5:
As shown in Figure 1, on the basis of any one embodiment above-mentioned, the present embodiment is further improved.Concrete, the present embodiment also comprises an ARM module.ARM module output terminal is connected with DSP module input end, and ARM module installation has abnormal patterns, for monitoring the duty of digital signal processing unit.ARM module plays supervisory function bit to digital signal processing unit, when there are abnormal conditions in FPGA module and DSP module work, the abnormal patterns of ARM module just sends reset signal to DSP module, DSP module is according to the duty of this reset signal management FPGA, make digital signal processing unit recover normal operating conditions, thus ensure stable operation of the present invention.In addition, when needs are standby, the upper and lower electric control of ARM module in charge management DSP module and FPGA module, reduces power consumption of the present invention, prolongs standby time.
In addition, the output terminal of ARM module is also connected with the control end of power rail each in power module, the electrifying timing sequence of each power rail is controlled by ARM module, control startup and the shutoff of other each module, thus saving energy consumption, and the electrifying timing sequence of power rail is controlled by ARM module, its control accuracy is higher, ensures stability of the present invention further.
Embodiment 6:
As shown in Figure 1, on the basis of above-described embodiment, the present embodiment is done further to optimize, a clock module is also comprised in the present embodiment, the output terminal of clock module accesses AD conversion unit and digital signal processing unit respectively, clock module receives prime radio frequency list without the fundamental clock sent here, and the clock signal different according to the Buffer fan-out of different clocks, ensures that the amplitude of clock signal, frequency, waveform meet the demands simultaneously.
In addition, the interface module in the present embodiment adopts LVDS bus transfer data, instead of conventional serial interface transmission, realizes the beneficial effect of two-forty, low-power consumption, low cost.Also comprise security module, described security module and FPGA module are bi-directionally connected, and for resolving of high precision Big Dipper satellite signal, when participating in powering on, carry out Big Dipper satellite signal positioning work fast simultaneously.In addition, interface module also comprises the 1PPS interface, the RS422 interface that are bi-directionally connected with FPGA module, and wherein 1PPS is used for providing pulse per second (PPS), to ensure the time synchronized of the present invention and navigation positioning data receiving equipment.RS422 interface can be used for navigation positioning data transmission, can be DSP and FPGA upgrade software simultaneously.
In the present embodiment, digital signal processing unit also comprises DSP module, FPGA module and FPGA II module, wherein DSP module and FPGA module identical with above-described embodiment 2 or embodiment 3, FPGA II module of setting up and FPGA module are bi-directionally connected, be exclusively used in the decryption processing to coded signal, to expand the scope of application of the present invention.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.
Claims (9)
1. a multifrequency point, quick position navigation satellite signal baseband processing circuitry, comprise power module, AD conversion unit, digital signal processing unit, interface module, described power module provides power rail to each unit or module, described AD conversion unit receives the analog intermediate frequency signal of prime radio frequency unit, the output terminal of AD conversion unit is connected with the input end of digital signal processing unit, interface module and digital processing element are bi-directionally connected, it is characterized in that: described AD conversion unit comprises wave filter, first AD conversion module and the second AD conversion module, the input end of described wave filter is connected with radio frequency processing module output terminal, the output terminal of wave filter connects the input end of the first AD conversion module and the input end of the second AD conversion module respectively, described first AD conversion module and the second AD conversion module all include hyperchannel AD converter, the satellite-signal of GPS and GLONASS is converted to digital signal by the first AD conversion module, Big Dipper satellite signal is converted to digital signal by the second AD conversion module, both supplied with digital signal processing modules.
2. multifrequency point according to claim 1, quick position navigation satellite signal baseband processing circuitry, is characterized in that: the hyperchannel AD converter that described first AD conversion module and the second AD conversion module all comprise is the analog to digital converter of 16 precision.
3. multifrequency point according to claim 1, quick position navigation satellite signal baseband processing circuitry, it is characterized in that: also comprise back-up source module, when external power source power down being detected, continue as the power supply supply that each module or unit provide a period of time, detect prime radio frequency unit whether to work simultaneously, if radio frequency unit is working properly, then proceed location, navigation work, if radio frequency unit does not work, then carry out information preservation and standby a period of time.
4. multifrequency point according to claim 1, quick position navigation satellite signal baseband processing circuitry, it is characterized in that: also comprise RTC module, RTC module provides UTC clock for digital signal processing unit, when outside power supply power-fail, RTC module can continue timing, when external power source powers on, RTC module provides UTC clock.
5. multifrequency point according to claim 1, quick position navigation satellite signal baseband processing circuitry, is characterized in that: described digital signal processing unit comprises FPGA module and DSP module, be bi-directionally connected between described FPGA module and DSP module.
6. multifrequency point according to claim 5, quick position navigation satellite signal baseband processing circuitry, it is characterized in that: also comprise ARM module, described ARM module input is connected with DSP module input end, ARM module comprises abnormal patterns, for monitoring the duty of digital signal processing unit.
7. multifrequency point according to claim 6, quick position navigation satellite signal baseband processing circuitry, is characterized in that: the output terminal of described ARM module is also connected with the control end of power rail each in power module.
8. multifrequency point according to claim 5, quick position navigation satellite signal baseband processing circuitry, it is characterized in that: also comprise security module, described security module and FPGA module are bi-directionally connected, for participating in resolving of Beidou II satellite-signal.
9. the multifrequency point according to claim 1 to any one of claim 8, quick position navigation satellite signal baseband processing circuitry, is characterized in that: described interface module comprises LVDS bus.
10.multifrequency point according to claim 1 to any one of claim 8, quick position navigation satellite signal baseband processing circuitry, it is characterized in that: also comprise clock module, the output terminal of described clock module accesses AD conversion unit and digital signal processing unit respectively.
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