CN110927754A - Low-orbit high-reliability micro-nano satellite navigation receiver - Google Patents
Low-orbit high-reliability micro-nano satellite navigation receiver Download PDFInfo
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- CN110927754A CN110927754A CN201911121228.5A CN201911121228A CN110927754A CN 110927754 A CN110927754 A CN 110927754A CN 201911121228 A CN201911121228 A CN 201911121228A CN 110927754 A CN110927754 A CN 110927754A
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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
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
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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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Abstract
The invention relates to a low-orbit high-reliability micro-nano satellite navigation receiver, belonging to the technical field of positioning navigation; the receiver comprises a first filter, a low-noise amplifier module, a first splitter, a receiver host and a receiver standby machine; the receiver host comprises a second splitter, 4 second filters, a first navigation radio frequency chip, a second navigation radio frequency chip, a first clock module, a first anti-irradiation multimode satellite navigation baseband SoC, a first anti-fuse FPGA and a first FLASH module; the receiver standby machine comprises a third splitter, 4 third filters, a third navigation radio frequency chip, a fourth navigation radio frequency chip, a second clock module, a second anti-irradiation multimode satellite navigation baseband SoC, a second anti-fuse type FPGA and a second FLASH module; the invention has high reliability, light weight and low power consumption, is particularly suitable for application in the environment of a microminiature satellite, and meets the requirements of a satellite system with long service life, high reliability, high integration and miniaturization.
Description
Technical Field
The invention belongs to the technical field of positioning navigation, and relates to a low-orbit high-reliability micro-nano satellite navigation receiver.
Background
In recent years, with the rapid development of micro-nano satellite applications, applications such as autonomous positioning, orbit determination, orbit extrapolation, inter-satellite communication and the like for micro-nano satellites also become a hot research direction in the navigation field. The micro-nano satellite has the advantages of low power consumption, low cost, low weight, short development period, flexible load application, strong replaceability and the like, and is in a rapid development stage. At present, micro-nano satellite networking systems in multiple fields of military communication, civil navigation, scientific experiments, ground investigation, space exploration, multimedia, mobile interconnection, surveying and mapping and the like enter the construction and demonstration stages. According to statistics, thousands of micro/nano satellites can be applied to in-orbit networking in five years in the future. The networking micro-nano satellite platform and the application load have wide and urgent requirements on functions such as high-precision positioning, precise orbit determination, orbit extrapolation, precise time service, inter-satellite communication and the like.
With the increasingly wide application of the micro satellite in the navigation field, the satellite-borne GNSS receiver also puts higher requirements on reliability, on-orbit application life and the like on the basis of the requirements on volume, weight, power consumption and the like. The multiple module arrangement of conventional receivers has not been satisfactory in these respects.
Disclosure of Invention
The technical problem solved by the invention is as follows: the micro-nano satellite navigation receiver overcomes the defects of the prior art, is high in reliability, light in weight and low in power consumption, is particularly suitable for being applied to a micro-micro satellite environment, and meets the requirements of a satellite system which is long in service life, high in reliability, high in integration and small in size.
The technical scheme of the invention is as follows:
a low-orbit high-reliability micro-nano satellite navigation receiver comprises a first filter, a low-noise amplifier module, a first splitter, a receiver main machine and a receiver standby machine; the receiver host comprises a second splitter, 4 second filters, a first navigation radio frequency chip, a second navigation radio frequency chip, a first clock module, a first anti-irradiation multimode satellite navigation baseband SoC, a first anti-fuse FPGA and a first FLASH module; the receiver standby machine comprises a third splitter, 4 third filters, a third navigation radio frequency chip, a fourth navigation radio frequency chip, a second clock module, a second anti-irradiation multimode satellite navigation baseband SoC, a second anti-fuse type FPGA and a second FLASH module;
the micro-nano satellite navigation receiver comprises three working modes, namely a receiver host working mode, a receiver standby working mode and a receiver standby common working mode;
when the receiver host is in working mode
A first filter: receiving a navigation signal transmitted by an external antenna, performing broadband filtering processing on the navigation signal to generate a processed navigation signal, and transmitting the processed navigation signal to a low-noise amplifier module;
module is put to low noise: receiving the processed navigation signal transmitted by the first filter, amplifying the processed navigation signal to generate an amplified navigation signal, and transmitting the amplified navigation signal to the first splitter;
a first splitter: receiving the amplified navigation signal transmitted by the low-noise amplifier module, carrying out shunt processing on the amplified navigation signal to generate a receiver host navigation signal, and transmitting the receiver host navigation signal to a second shunt;
a second splitter: receiving a receiver host navigation signal transmitted by the first splitter, carrying out splitting processing on the receiver host navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 second filters;
a second filter: the 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a first navigation radio frequency chip; the other 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a second navigation radio frequency chip;
a first clock module: generating a clock signal; respectively sending the clock signals to a first navigation radio frequency chip, a second navigation radio frequency chip and a first anti-irradiation multimode satellite navigation baseband SOC;
the first navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 second filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
the second navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 second filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
first antifuse-type FPGA: receiving program data transmitted by a first FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC;
the first anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by a first antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a first navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a second navigation radio frequency chip; resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of a receiver host;
when the receiver is in standby mode
A first filter: receiving a navigation signal transmitted by an external antenna, performing broadband filtering processing on the navigation signal to generate a processed navigation signal, and transmitting the processed navigation signal to a low-noise amplifier module;
module is put to low noise: receiving the processed navigation signal transmitted by the first filter, amplifying the processed navigation signal to generate an amplified navigation signal, and transmitting the amplified navigation signal to the first splitter;
a first splitter: receiving the amplified navigation signal transmitted by the low-noise amplification module, carrying out shunt processing on the amplified navigation signal to generate a receiver standby navigation signal, and transmitting the receiver standby navigation signal to a third shunt;
a third shunt: receiving the receiver standby navigation signal transmitted by the first splitter, performing splitting processing on the receiver standby navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 third filters;
a third filter: the 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a third navigation radio frequency chip; the other 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a fourth navigation radio frequency chip;
a second clock module: generating a clock signal; clock signals are respectively sent to a third navigation radio frequency chip, a fourth navigation radio frequency chip and a second anti-radiation multimode satellite navigation baseband SOC;
the third navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 third filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
the fourth navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 third filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
second antifuse-type FPGA: receiving program data transmitted by a second FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC;
second anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by the second antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a third navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a fourth navigation radio frequency chip; resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of a receiver host;
when the receiver main unit and the receiver standby unit work together
A first filter: receiving a navigation signal transmitted by an external antenna, performing broadband filtering processing on the navigation signal to generate a processed navigation signal, and transmitting the processed navigation signal to a low-noise amplifier module;
module is put to low noise: receiving the processed navigation signal transmitted by the first filter, amplifying the processed navigation signal to generate an amplified navigation signal, and transmitting the amplified navigation signal to the first splitter;
a first splitter: receiving the amplified navigation signal transmitted by the low-noise amplifier module, carrying out shunt processing on the amplified navigation signal to generate a receiver host machine navigation signal and a receiver standby machine navigation signal, and transmitting the receiver host machine navigation signal to a second shunt; sending the standby machine navigation signal of the receiver to a third shunt;
a second splitter: receiving a receiver host navigation signal transmitted by the first splitter, carrying out splitting processing on the receiver host navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 second filters;
a second filter: the 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a first navigation radio frequency chip; the other 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a second navigation radio frequency chip;
a third shunt: receiving the receiver standby navigation signal transmitted by the first splitter, performing splitting processing on the receiver standby navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 third filters;
a third filter: the 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a third navigation radio frequency chip; the other 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a fourth navigation radio frequency chip;
a first clock module: generating a clock signal; respectively sending the clock signals to a first navigation radio frequency chip, a second navigation radio frequency chip and a first anti-irradiation multimode satellite navigation baseband SOC;
the first navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 second filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
the second navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 second filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
a second clock module: generating a clock signal; clock signals are respectively sent to a third navigation radio frequency chip, a fourth navigation radio frequency chip and a second anti-radiation multimode satellite navigation baseband SOC;
the third navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 third filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
the fourth navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 third filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
first antifuse-type FPGA: receiving program data transmitted by a first FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC;
the first anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by a first antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a first navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a second navigation radio frequency chip; resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of a receiver host;
second antifuse-type FPGA: receiving program data transmitted by a second FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC;
second anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by the second antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a third navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a fourth navigation radio frequency chip; and resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of the receiver host.
In the low-orbit high-reliability micro-nano satellite navigation receiver, the first filter module is provided with a dielectric filter, and the central frequency point of the dielectric filter is 1400 MHz.
In the low-orbit high-reliability micro-nano satellite navigation receiver, the noise coefficient of the low-noise amplification module is 0.9 dB.
In the micro-nano satellite navigation receiver with low orbit and high reliability, the first splitter generates 3dB attenuation on the strength of the amplified navigation signal.
In the low-orbit high-reliability micro-nano satellite navigation receiver, the first clock module comprises a high-stability crystal oscillator and a clock amplifier module, and 62MHz clock signals are respectively provided for the first navigation radio frequency chip, the second navigation radio frequency chip and the first anti-irradiation multimode satellite navigation baseband SOC.
In the low-orbit high-reliability micro-nano satellite navigation receiver, the second clock module comprises a high-stability crystal oscillator and a clock amplifier module, and 62MHz clock signals are respectively provided for the third navigation radio frequency chip, the fourth navigation radio frequency chip and the second anti-irradiation multimode satellite navigation baseband SOC.
In the low-orbit high-reliability micro-nano satellite navigation receiver, the irradiation total dose index of the first antifuse-type FPGA is superior to 100 Krad.
In the low-orbit high-reliability micro-nano satellite navigation receiver, the irradiation total dose index of the second antifuse-type FPGA is superior to 100 Krad.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention realizes the simultaneous receiving and processing of the double-mode double-frequency navigation signals of the Beidou system (global coverage) and the GPS, integrates all modules in the same circuit board through the high-integration design, realizes the cold backup design by the single board, has high integration level, light weight, low power consumption and high reliability, and is suitable for the low-orbit micro-nano satellite system with long service life and high reliability requirement on in-orbit application;
(2) the invention realizes the high-integration design, integrates the radio frequency front end part, the baseband signal processing part, the power supply part, the clock part and the like in one circuit board, has small noise coefficient of the whole machine and excellent performance, and is suitable for the requirements of the application environment of the new generation of the micro-nano satellite;
(3) the invention realizes a new generation of clock design scheme with high reliability integration, adopts a highly integrated clock chip, adopts a clock module as a reference source of the whole receiver, and avoids the problem of mutual interference through an isolation amplification design. The chip has small volume and high reliability, and improves the integration and reliability of the receiver;
(4) the invention realizes the application of the low-orbit micro-nano satellite in the global networking of the Beidou system, and realizes the functions of the micro-nano satellite system such as accurate positioning, precise orbit determination, precise time service, orbit extrapolation and the like.
Drawings
FIG. 1 is a schematic diagram of a navigation receiver system according to the present invention.
Detailed Description
The invention is further illustrated by the following examples.
The invention provides a low-orbit high-reliability micro-nano satellite navigation receiver which is high in reliability, light in weight and low in power consumption, is particularly suitable for being applied to a micro-micro satellite environment, and meets the requirements of a long-life, high-reliability, high-integration and miniaturized satellite system. The whole machine adopts a cold backup design, improves the on-orbit operation reliability of products, and is particularly suitable for the requirements on high reliability and on-orbit service life. The invention realizes the receiving of multi-system multi-frequency point navigation signals on the micro-nano satellite platform, and realizes the functions of high-precision positioning, precise orbit determination, orbit extrapolation, precise time service, inter-satellite communication and the like on the micro-nano satellite platform; the problem of limitation of a miniaturized satellite navigation receiver in functional application is solved, each performance index achieves a relatively ideal effect, the product meets the overall requirement, and the functional coverage of a micro-nano satellite platform is realized.
As shown in fig. 1, the micro/nano satellite navigation receiver comprises a first filter, a low-noise amplifier module, a first splitter, a receiver main machine and a receiver standby machine; the receiver host comprises a second splitter, 4 second filters, a first navigation radio frequency chip, a second navigation radio frequency chip, a first clock module, a first anti-irradiation multimode satellite navigation baseband SoC, a first anti-fuse FPGA and a first FLASH module; the receiver standby machine comprises a third splitter, 4 third filters, a third navigation radio frequency chip, a fourth navigation radio frequency chip, a second clock module, a second anti-irradiation multimode satellite navigation baseband SoC, a second anti-fuse type FPGA and a second FLASH module;
the micro-nano satellite navigation receiver comprises three working modes, namely a receiver host working mode, a receiver standby working mode and a receiver standby common working mode;
when the receiver host is in working mode
A first filter: receiving a navigation signal transmitted by an external antenna, performing broadband filtering processing on the navigation signal to generate a processed navigation signal, and transmitting the processed navigation signal to a low-noise amplifier module; the first filter module comprises a dielectric filter, the central frequency point is 1400MHz, the bandwidth is fo +/-200 MHz, and the navigation signal received by the navigation antenna is subjected to broadband filtering processing to suppress out-of-band interference signals.
Module is put to low noise: receiving the processed navigation signal transmitted by the first filter, amplifying the processed navigation signal to generate an amplified navigation signal, and transmitting the amplified navigation signal to the first splitter; the noise coefficient of the low-noise amplification module is 0.9dB, and the in-band weak navigation signal processed by the broadband filter is amplified, so that the navigation receiver is ensured to have a higher signal-to-noise ratio.
A first splitter: receiving the amplified navigation signal transmitted by the low-noise amplifier module, carrying out shunt processing on the amplified navigation signal to generate a receiver host navigation signal, and transmitting the receiver host navigation signal to a second shunt; the first splitter attenuates the strength of the navigation signal by 3dB, receives the navigation signal amplified by the low-noise amplifier module, splits the navigation signal into two paths of navigation signals and respectively provides the two paths of navigation signals for the main machine and the standby machine of the receiver.
A second splitter: and receiving the receiver host navigation signal transmitted by the first splitter, carrying out splitting processing on the receiver host navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 second filters.
A second filter: the 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a first navigation radio frequency chip; the other 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a second navigation radio frequency chip; the second filter receives the four navigation signals transmitted by the second splitter, and after narrow-band filtering processing is carried out on the four navigation signals, interference signals outside a central frequency point fo +/-30 MHz band are suppressed, so that navigation signals of a receiver host GPS system and navigation signals of a Beidou system are obtained.
A first clock module: generating a clock signal; respectively sending the clock signals to a first navigation radio frequency chip, a second navigation radio frequency chip and a first anti-irradiation multimode satellite navigation baseband SOC; in order not to interfere with each other, the clocks are used after being subjected to isolation amplification processing.
The first navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 second filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
the second navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 second filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
first antifuse-type FPGA: receiving program data transmitted by a first FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC; the first FLASH module has an anti-radiation index, the total anti-radiation dose index is superior to 100Krad, the first FLASH module is suitable for the complex environment of a low-orbit satellite, has strong single particle resistance and the like, has high reliability in the in-orbit operation process, and is mainly used for storing software programs, key data, ephemeris almanac information and the like.
The first anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by a first antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a first navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a second navigation radio frequency chip; resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of a receiver host; the first anti-irradiation multimode satellite navigation baseband SOC module receives GPS system L1 and L2 digital intermediate frequency signals transmitted by the first navigation radio frequency chip, Beidou system digital intermediate frequency signals transmitted by the second navigation radio frequency chip, 62MHz clock signals transmitted by the first clock module are received as input clock signals, and the first navigation radio frequency chip and the second navigation radio frequency chip are configured through the SPI. The first anti-irradiation multimode satellite navigation baseband SOC captures, tracks and demodulates a receiver host navigation signal to obtain information such as original observed quantity and telegraph text of a navigation satellite, the receiver adopts a pseudo-range measurement positioning principle to complete a positioning function according to the information such as the telegraph text information and the original observed quantity of the navigation satellite, and adopts a Doppler velocity measurement principle to complete a velocity measurement function. The functional unit is used for performing real-time Kalman filtering processing to output satellite orbit parameters by using pseudo-range or carrier phase and broadcast ephemeris of GPS and BD systems as observation data, can process the observation data of a GNSS receiver in real time in orbit, and completes the functions of navigation resolving, positioning, orbit determination, time service, orbit extrapolation and the like of satellite signals.
When the receiver is in standby mode
A first filter: receiving a navigation signal transmitted by an external antenna, performing broadband filtering processing on the navigation signal to generate a processed navigation signal, and transmitting the processed navigation signal to a low-noise amplifier module;
module is put to low noise: receiving the processed navigation signal transmitted by the first filter, amplifying the processed navigation signal to generate an amplified navigation signal, and transmitting the amplified navigation signal to the first splitter;
a first splitter: receiving the amplified navigation signal transmitted by the low-noise amplification module, carrying out shunt processing on the amplified navigation signal to generate a receiver standby navigation signal, and transmitting the receiver standby navigation signal to a third shunt;
a third shunt: receiving the receiver standby navigation signal transmitted by the first splitter, performing splitting processing on the receiver standby navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 third filters;
a third filter: the 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a third navigation radio frequency chip; the other 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a fourth navigation radio frequency chip; and the third filter receives the four navigation signals transmitted by the third splitter, and after narrowband filtering processing is performed on the four navigation signals, interference signals outside a central frequency point fo +/-30 MHz band are suppressed, so that the navigation signals of the standby GPS system of the receiver and the navigation signals of the Beidou system are obtained.
A second clock module: generating a clock signal; clock signals are respectively sent to a third navigation radio frequency chip, a fourth navigation radio frequency chip and a second anti-radiation multimode satellite navigation baseband SOC; in order not to interfere with each other, the clocks are used after being subjected to isolation amplification processing.
The third navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 third filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
the fourth navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 third filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
second antifuse-type FPGA: receiving program data transmitted by a second FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC; the second FLASH module has an anti-radiation index, the total anti-radiation dose index is superior to 100Krad, the second FLASH module is suitable for the complex environment of a low-orbit satellite, has strong single particle resistance and the like, has high reliability in the in-orbit operation process, and is mainly used for storing software programs, key data, ephemeris almanac information and the like.
Second anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by the second antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a third navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a fourth navigation radio frequency chip; resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of a receiver host; the second anti-radiation multimode satellite navigation baseband SOC module receives a GPS system digital intermediate frequency signal transmitted by the third navigation radio frequency chip, a Beidou system digital intermediate frequency signal transmitted by the fourth navigation radio frequency chip, receives a 62MHz clock signal transmitted by the second clock module as an input clock signal, and configures the third navigation radio frequency chip and the fourth navigation radio frequency chip through the SPI. And the second anti-irradiation multimode satellite navigation baseband SOC captures, tracks and demodulates the standby machine navigation signal of the receiver so as to obtain information such as original observed quantity and telegraph text of the navigation satellite, and according to the information such as the telegraph text information and the original observed quantity of the navigation satellite, the receiver adopts a pseudo-range measurement positioning principle to complete a positioning function and adopts a Doppler velocity measurement principle to complete a velocity measurement function. The functional unit is used for performing real-time Kalman filtering processing to output satellite orbit parameters by using pseudo-range or carrier phase and broadcast ephemeris of GPS and BD systems as observation data, can process the observation data of a GNSS receiver in real time in orbit, and completes the functions of navigation resolving, positioning, orbit determination, time service, orbit extrapolation and the like of satellite signals.
When the receiver main unit and the receiver standby unit work together
A first filter: receiving a navigation signal transmitted by an external antenna, performing broadband filtering processing on the navigation signal to generate a processed navigation signal, and transmitting the processed navigation signal to a low-noise amplifier module;
module is put to low noise: receiving the processed navigation signal transmitted by the first filter, amplifying the processed navigation signal to generate an amplified navigation signal, and transmitting the amplified navigation signal to the first splitter;
a first splitter: receiving the amplified navigation signal transmitted by the low-noise amplifier module, carrying out shunt processing on the amplified navigation signal to generate a receiver host machine navigation signal and a receiver standby machine navigation signal, and transmitting the receiver host machine navigation signal to a second shunt; sending the standby machine navigation signal of the receiver to a third shunt;
a second splitter: receiving a receiver host navigation signal transmitted by the first splitter, carrying out splitting processing on the receiver host navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 second filters;
a second filter: the 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a first navigation radio frequency chip; the other 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a second navigation radio frequency chip;
a third shunt: receiving the receiver standby navigation signal transmitted by the first splitter, performing splitting processing on the receiver standby navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 third filters;
a third filter: the 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a third navigation radio frequency chip; the other 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a fourth navigation radio frequency chip;
a first clock module: generating a clock signal; respectively sending the clock signals to a first navigation radio frequency chip, a second navigation radio frequency chip and a first anti-irradiation multimode satellite navigation baseband SOC;
the first navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 second filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
the second navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 second filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
a second clock module: generating a clock signal; clock signals are respectively sent to a third navigation radio frequency chip, a fourth navigation radio frequency chip and a second anti-radiation multimode satellite navigation baseband SOC;
the third navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 third filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
the fourth navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 third filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
first antifuse-type FPGA: receiving program data transmitted by a first FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC;
the first anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by a first antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a first navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a second navigation radio frequency chip; resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of a receiver host;
second antifuse-type FPGA: receiving program data transmitted by a second FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC;
second anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by the second antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a third navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a fourth navigation radio frequency chip; and resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of the receiver host.
The actual measurement result of the performance index of the navigation receiver is shown in table 1, and in addition, through ground verification test and on-orbit test, the main technical indexes of the product, including key technical indexes such as orbit determination, time service and the like, all reach the domestic advanced level.
TABLE 1
The invention breaks through the traditional FPGA + DSP architecture of the navigation receiver, gets rid of the dependence of traditional core devices on foreign import, applies the anti-irradiation multimode satellite navigation baseband SoC chip on orbit for the first time, breaks through the index limitation of the traditional domestic chip aiming at the current events that numerous micro-nano satellites applied on orbit are influenced by space environment, such as single event upset and the like, realizes the core function chip anti-irradiation capability of a satellite-borne navigation product, and greatly improves the reliability and the service life of the micro-nano satellite navigation receiver in orbit.
The invention combines the space operation environment of the low-orbit navigation equipment, utilizes pseudo-range or carrier phase of GPS and BD systems and broadcast ephemeris as observation data, carries out real-time Kalman filtering processing to output the functional unit of satellite orbit parameters, can process the observation data of a GNSS receiver in orbit in real time, and stably outputs state parameters such as satellite operation position, speed and the like. According to the embodiment of the invention, the real-time orbit determination position precision is improved to be within 2m from the traditional 5m, the speed precision is improved to be 0.01m/s from the traditional 0.1m/s, and the statistical average value of the time service precision is 50 ns.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (8)
1. A low-orbit high-reliability micro-nano satellite navigation receiver is characterized in that: the receiver comprises a first filter, a low-noise amplifier module, a first splitter, a receiver host and a receiver standby machine; the receiver host comprises a second splitter, 4 second filters, a first navigation radio frequency chip, a second navigation radio frequency chip, a first clock module, a first anti-irradiation multimode satellite navigation baseband SoC, a first anti-fuse FPGA and a first FLASH module; the receiver standby machine comprises a third splitter, 4 third filters, a third navigation radio frequency chip, a fourth navigation radio frequency chip, a second clock module, a second anti-irradiation multimode satellite navigation baseband SoC, a second anti-fuse type FPGA and a second FLASH module;
the micro-nano satellite navigation receiver comprises three working modes, namely a receiver host working mode, a receiver standby working mode and a receiver standby common working mode;
when the receiver host is in working mode
A first filter: receiving a navigation signal transmitted by an external antenna, performing broadband filtering processing on the navigation signal to generate a processed navigation signal, and transmitting the processed navigation signal to a low-noise amplifier module;
module is put to low noise: receiving the processed navigation signal transmitted by the first filter, amplifying the processed navigation signal to generate an amplified navigation signal, and transmitting the amplified navigation signal to the first splitter;
a first splitter: receiving the amplified navigation signal transmitted by the low-noise amplifier module, carrying out shunt processing on the amplified navigation signal to generate a receiver host navigation signal, and transmitting the receiver host navigation signal to a second shunt;
a second splitter: receiving a receiver host navigation signal transmitted by the first splitter, carrying out splitting processing on the receiver host navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 second filters;
a second filter: the 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a first navigation radio frequency chip; the other 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a second navigation radio frequency chip;
a first clock module: generating a clock signal; respectively sending the clock signals to a first navigation radio frequency chip, a second navigation radio frequency chip and a first anti-irradiation multimode satellite navigation baseband SOC;
the first navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 second filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
the second navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 second filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
first antifuse-type FPGA: receiving program data transmitted by a first FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC;
the first anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by a first antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a first navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a second navigation radio frequency chip; resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of a receiver host;
when the receiver is in standby mode
A first filter: receiving a navigation signal transmitted by an external antenna, performing broadband filtering processing on the navigation signal to generate a processed navigation signal, and transmitting the processed navigation signal to a low-noise amplifier module;
module is put to low noise: receiving the processed navigation signal transmitted by the first filter, amplifying the processed navigation signal to generate an amplified navigation signal, and transmitting the amplified navigation signal to the first splitter;
a first splitter: receiving the amplified navigation signal transmitted by the low-noise amplification module, carrying out shunt processing on the amplified navigation signal to generate a receiver standby navigation signal, and transmitting the receiver standby navigation signal to a third shunt;
a third shunt: receiving the receiver standby navigation signal transmitted by the first splitter, performing splitting processing on the receiver standby navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 third filters;
a third filter: the 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a third navigation radio frequency chip; the other 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a fourth navigation radio frequency chip;
a second clock module: generating a clock signal; clock signals are respectively sent to a third navigation radio frequency chip, a fourth navigation radio frequency chip and a second anti-radiation multimode satellite navigation baseband SOC;
the third navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 third filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
the fourth navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 third filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
second antifuse-type FPGA: receiving program data transmitted by a second FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC;
second anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by the second antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a third navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a fourth navigation radio frequency chip; resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of a receiver host;
when the receiver main unit and the receiver standby unit work together
A first filter: receiving a navigation signal transmitted by an external antenna, performing broadband filtering processing on the navigation signal to generate a processed navigation signal, and transmitting the processed navigation signal to a low-noise amplifier module;
module is put to low noise: receiving the processed navigation signal transmitted by the first filter, amplifying the processed navigation signal to generate an amplified navigation signal, and transmitting the amplified navigation signal to the first splitter;
a first splitter: receiving the amplified navigation signal transmitted by the low-noise amplifier module, carrying out shunt processing on the amplified navigation signal to generate a receiver host machine navigation signal and a receiver standby machine navigation signal, and transmitting the receiver host machine navigation signal to a second shunt; sending the standby machine navigation signal of the receiver to a third shunt;
a second splitter: receiving a receiver host navigation signal transmitted by the first splitter, carrying out splitting processing on the receiver host navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 second filters;
a second filter: the 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a first navigation radio frequency chip; the other 2 second filters receive the shunt navigation signals transmitted by the second shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a second navigation radio frequency chip;
a third shunt: receiving the receiver standby navigation signal transmitted by the first splitter, performing splitting processing on the receiver standby navigation signal to generate 4 paths of splitting navigation signals, and respectively transmitting the 4 paths of splitting navigation signals to 4 third filters;
a third filter: the 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-path GPS system navigation signals; sending the 2-path GPS system navigation signals to a third navigation radio frequency chip; the other 2 third filters receive the shunt navigation signals transmitted by the third shunt; respectively carrying out narrow-band filtering processing on the shunt navigation signals to generate 2-way north-fighting system navigation signals; sending the 2-way north dipper system navigation signal to a fourth navigation radio frequency chip;
a first clock module: generating a clock signal; respectively sending the clock signals to a first navigation radio frequency chip, a second navigation radio frequency chip and a first anti-irradiation multimode satellite navigation baseband SOC;
the first navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 second filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
the second navigation radio frequency chip: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 second filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a first anti-radiation multimode satellite navigation baseband SOC;
a second clock module: generating a clock signal; clock signals are respectively sent to a third navigation radio frequency chip, a fourth navigation radio frequency chip and a second anti-radiation multimode satellite navigation baseband SOC;
the third navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2 paths of GPS system navigation signals transmitted by 2 third filters; respectively carrying out frequency mixing processing on 2 paths of GPS system navigation signals to generate 2 paths of digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
the fourth navigation radio frequency chip: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving 2-way north dipper system navigation signals transmitted by the other 2 third filters; respectively carrying out frequency mixing processing on the 2-path Beidou system navigation signals to generate 2-path digital intermediate frequency signals; sending the 2 paths of digital intermediate frequency signals to a second anti-radiation multimode satellite navigation baseband SOC;
first antifuse-type FPGA: receiving program data transmitted by a first FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC;
the first anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a first clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by a first antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a first navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a second navigation radio frequency chip; resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of a receiver host;
second antifuse-type FPGA: receiving program data transmitted by a second FLASH module; performing time sequence processing on the program data to generate time sequence processed program data; sending the program data after the time sequence processing to a first anti-irradiation multimode satellite navigation baseband SOC;
second anti-irradiation multimode satellite navigation baseband SOC: receiving a clock signal transmitted by a second clock module; carrying out self time service according to the clock signal; receiving program data after time sequence processing transmitted by the second antifuse type FPGA; loading program data after time sequence processing; receiving 2 paths of digital intermediate frequency signals transmitted by a third navigation radio frequency chip; receiving 2 paths of digital intermediate frequency signals transmitted by a fourth navigation radio frequency chip; and resolving the 4 paths of digital intermediate frequency signals, and resolving the position, the speed and the time service time of the receiver host.
2. The low-orbit high-reliability micro-nano satellite navigation receiver according to claim 1, is characterized in that: the first filter module is provided with a dielectric filter, and the central frequency point of the dielectric filter is 1400 MHz.
3. The low-orbit high-reliability micro-nano satellite navigation receiver according to claim 2, is characterized in that: the noise coefficient of the low-noise amplifier module is 0.9 dB.
4. The low-orbit high-reliability micro-nano satellite navigation receiver according to claim 3, is characterized in that: the first splitter produces a 3dB attenuation of the strength of the amplified navigation signal.
5. The low-orbit high-reliability micro-nano satellite navigation receiver according to claim 4, is characterized in that: the first clock module comprises a high-stability crystal oscillator and a clock amplifier module, and the clock amplifier module is used for respectively providing 62MHz clock signals for the first navigation radio frequency chip, the second navigation radio frequency chip and the first anti-irradiation multimode satellite navigation baseband SOC.
6. The low-orbit high-reliability micro-nano satellite navigation receiver according to claim 5, is characterized in that: the second clock module comprises a high-stability crystal oscillator and a clock amplifier module, and the clock amplifier module is used for respectively providing 62MHz clock signals for the third navigation radio frequency chip, the fourth navigation radio frequency chip and the second anti-irradiation multimode satellite navigation baseband SOC.
7. The low-orbit high-reliability micro-nano satellite navigation receiver according to claim 6, is characterized in that: the irradiation total dose index of the first antifuse-type FPGA is superior to 100 Krad.
8. The low-orbit high-reliability micro-nano satellite navigation receiver according to claim 7, is characterized in that: the total irradiation dose index of the second antifuse-type FPGA is better than 100 Krad.
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Application publication date: 20200327 |