CN105116427A - Vehicle-mounted navigation channel adaptive system based on pre-distorter - Google Patents
Vehicle-mounted navigation channel adaptive system based on pre-distorter Download PDFInfo
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- CN105116427A CN105116427A CN201510547986.9A CN201510547986A CN105116427A CN 105116427 A CN105116427 A CN 105116427A CN 201510547986 A CN201510547986 A CN 201510547986A CN 105116427 A CN105116427 A CN 105116427A
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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
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/40—Correcting position, velocity or attitude
Abstract
The invention discloses a vehicle-mounted navigation channel adaptive system based on a pre-distorter, which comprises a microcontroller module, a GPS module, an analog-to-digital conversion module, a power supply module, a pre-filter, a frequency hopping signal processor, an error processor, a time delayer, the pre-distorter, a post-filter and an antenna. The adaptive pre-distortion system is adopted for compensation on vehicle-mounted GPS position positioning, position information acquired by a vehicle-mounted terminal can be better transmitted, out-of-band spectrum expansion of a BOC signal can be effectively restrained, out-of-band distortion can be reduced, a constellation diagram is optimized, in-band distortion is reduced, distortion influences on the BOC signal by the navigation channel can be well eliminated, and the system of the invention plays an important role in the satellite navigation system.
Description
Technical field
The present invention relates to a kind of self-adapted pre-distortion system, particularly relate to a kind of vehicle mounted guidance channel self-adapting system based on predistorter, belong to self-adapted pre-distortion control field.
Background technology
Because the memory nonlinear effect of channel launched by Navsat in satellite navigation system, the binary offset carrier (boc) modulated signals distortion of Bandwidth-Constrained is aggravated, and navigational system performance will be had a strong impact on.
The frequency spectrum division of BOC modulation signal is in the both sides of center frequency point, and what be conducive to avoiding with center frequency point signal spectrum is overlapped, thus reduces the mutual interference between signal, shares to realize frequency range.In addition, BOC modulation signal is narrower than the related function main lobe of BPSK modulation signal, and it has higher code tracking precision and stronger anti-multipath jamming ability.Because the uniqueness of BOC modulation makes it gain great popularity in GPS (Global Position System) of new generation.
BOC modulation signal launches channel through Navsat, and the non-ideal characteristic due to each device will make it produce distortion to a certain degree, causes the performance of navigational system can be subject to certain impact.At present, both at home and abroad to this existing relevant research.Several candidate BOC modulation signal characteristics of document Main Analysis Galileo, the nonlinear characteristic of wherein BOC modulation mainly adopts solid-state power amplifier to emulate, when to analyze power input rollback be 0dB, the dependent loss of BOC modulation system.The tracking accuracy of several candidate BOC modulation signals of document Main Analysis Galileo is subject to the impact of linear processes distortion, analyzes the power attenuation and dependent loss brought due to the restriction of filter bandwidht.On document Main Analysis star, high power amplifier is to the distortion effect of BOC and derivative signal thereof, the combined effect that Main Analysis bandwidth restriction and nonlinear effect are brought.
The impact of nonlinear distortion on satellite navigation system performance is mainly: cause signal amplitude, phase distortion, makes planisphere generation compression-deflection, and causing take over party to adjudicate and detecting affects by very large, causes inband distortion; Produce a large amount of intermodulation distortion and harmonic distortion, the monkey chatter (ACI) that signal spectrum expansion produces, produce out-of-band distortion.Therefore, the nonlinear compensation research of satellite navigation channel is seemed particularly important.But major part is just studied for the impact of imperfect satellite channel on BOC signal both at home and abroad at present, but very few for the research eliminating this impact.
Summary of the invention
Technical matters to be solved by this invention provides a kind of vehicle mounted guidance channel self-adapting system based on predistorter for the deficiency of background technology.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of vehicle mounted guidance channel self-adapting system based on predistorter, comprise micro controller module, GPS module, analog-to-digital conversion module, power module, prefilter, Frequency Hopping Signal processor, error processor, chronotron, predistorter, postfilter, antenna, described GPS module connects micro controller module by analog-to-digital conversion module, and described micro controller module connects antenna by prefilter, Frequency Hopping Signal processor, error processor, predistorter, postfilter successively; Described chronotron is connected with error processor, predistorter respectively, and described power module is connected with micro controller module, GPS module, analog-to-digital conversion module, prefilter, Frequency Hopping Signal processor, error processor, chronotron, predistorter, postfilter respectively;
Described predistorter comprises magnitude extraction module, core look-up table obtains and call unit, complex multiplication module, complex addition module and the DSP for store look-up tables data, it is RAM storer that described core look-up table obtains with call unit, described magnitude extraction module, core look-up table obtains and call unit, complex multiplication module and complex addition module are all integrated on FPGA, look-up table data to be injected the RAM storer on FPGA by described DSP by data bus, according to the amplitude index that described magnitude extraction module obtains, the look-up table data in RAM storer is read in real time.
As the further preferred version of a kind of vehicle mounted guidance channel self-adapting system based on predistorter of the present invention, described micro controller module adopts AVR series monolithic.
As the further preferred version of a kind of vehicle mounted guidance channel self-adapting system based on predistorter of the present invention, described GPS module adopts the SIFEIII of Gstar company for GS-15B module.
As the further preferred version of a kind of vehicle mounted guidance channel self-adapting system based on predistorter of the present invention, the chip model of described analog-to-digital conversion module is ADC0804.
As the further preferred version of a kind of vehicle mounted guidance channel self-adapting system based on predistorter of the present invention, described power module adopts storage battery power supply.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, the present invention adopts self-adaptation to lose system in advance to compensate location, vehicle GPS position, and then the better positional information that gathers of transmission vehicle mounted terminal; Device can effectively suppress the out of band spectrum of BOC signal to be expanded, and reduces out-of-band distortion, optimizes planisphere, reduces inband distortion, can eliminate the distortion effect of navigation channels to BOC signal well, have great significance in satellite navigation system.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, a kind of vehicle mounted guidance channel self-adapting system based on predistorter, comprise micro controller module, GPS module, analog-to-digital conversion module, power module, prefilter, Frequency Hopping Signal processor, error processor, chronotron, predistorter, postfilter, antenna, described GPS module connects micro controller module by analog-to-digital conversion module, and described micro controller module connects antenna by prefilter, Frequency Hopping Signal processor, error processor, predistorter, postfilter successively; Described chronotron is connected with error processor, predistorter respectively, and described power module is connected with micro controller module, GPS module, analog-to-digital conversion module, prefilter, Frequency Hopping Signal processor, error processor, chronotron, predistorter, postfilter respectively;
Described predistorter comprises magnitude extraction module, core look-up table obtains and call unit, complex multiplication module, complex addition module and the DSP for store look-up tables data, it is RAM storer that described core look-up table obtains with call unit, described magnitude extraction module, core look-up table obtains and call unit, complex multiplication module and complex addition module are all integrated on FPGA, look-up table data to be injected the RAM storer on FPGA by described DSP by data bus, according to the amplitude index that described magnitude extraction module obtains, the look-up table data in RAM storer is read in real time.
Wherein, described micro controller module adopts AVR series monolithic, and described GPS module adopts the SIFEIII of Gstar company for GS-15B module, and the chip model of described analog-to-digital conversion module is ADC0804, and described power module adopts storage battery power supply.
The present invention adopts self-adaptation to lose system in advance and compensates location, vehicle GPS position, and then the positional information of better transmission vehicle mounted terminal collection; Device can effectively suppress the out of band spectrum of BOC signal to be expanded, and reduces out-of-band distortion, optimizes planisphere, reduces inband distortion, can eliminate the distortion effect of navigation channels to BOC signal well, have great significance in satellite navigation system.
GPS module is that terminal realizes pinpoint key, is the core of Terminal Design, so this terminal have chosen the SIFEIII of Gstar company for GS-15B module.GS-15B is the intelligent satellite reception module of high-effect a, low-power consumption.It adopts MT3329F satnav receiving chip designed by the MediaTek Inc of Taiwan, is a complete satellite-positioning receiver.Possess comprehensive function simultaneously, strict demand and the technical grade demand of specialty aim can be met.Built-in gps antenna, adopts MTK high sensitivity, low power consumption chip MT3329F.Possesses the ability of quick position and tracking 32 satellites.Volume is extra small, chip built-in 200,000. and arithmetical unit, significantly improves and searches and computing satellite signals ability.Support that NMEA-0183v2.2 version specification exports.Receiving sensitivity is-157dBm, and working temperature is-40 DEG C ~ 85 DEG C, and Transistor-Transistor Logic level exports, and operating voltage 3.3 ~ 5.0V, cold start-up is only 42s positioning time, and average positioning precision is 10 ~ 15m.Both meet terminal to high performance-price ratio demand, also meet the pinpoint demand of terminal.
AVR single chip has prefetched instruction function, namely when an execution instruction, in advance next instruction is got into, and call instruction can be performed within a clock period; Multiple accumulator type, data processing speed is fast; AVR single chip has 32 general purpose working registers, and being equivalent to has 32 viaducts, can fast passing; Response time is fast.AVR single chip has multiple fixing interrupt vector entry address, can respond interruption fast; AVR single chip power consumption is low.For typical power consumption situation, be 100nA when WDT closes, be more suitable for battery powered application apparatus; The minimum 1.8V of some devices gets final product work; AVR single chip security performance is good.
Adaptive digital pre-distortion technology is one of compensating non-linear distortion the best way, and it is by reaching linearization object in the inverse characteristic of nonlinear device front construction nonlinear distortion.Along with the increase of information rate, signal bandwidth constantly increases, and navigation channels not only has nonlinear characteristic, and its memory effect is also more and more obvious.For the nonlinear distortion having memory effect, if still adopt traditional memoryless pre-distortion technology, nonlinear compensation mechanism may lose efficacy or poor effect.Therefore, the Linear Mending Technology studying nonlinear distortion with memory has very important significance.
The present invention designs a kind of vehicle mounted guidance channel self-adapting system based on predistorter, comprise micro controller module, GPS module, analog-to-digital conversion module, power module, prefilter, Frequency Hopping Signal processor, error processor, chronotron, predistorter, postfilter, antenna, described GPS module connects micro controller module by analog-to-digital conversion module, and described micro controller module connects antenna by prefilter, Frequency Hopping Signal processor, error processor, predistorter, postfilter successively; Described chronotron is connected with error processor, predistorter respectively, and described power module is connected with micro controller module, GPS module, analog-to-digital conversion module, prefilter, Frequency Hopping Signal processor, error processor, chronotron, predistorter, postfilter respectively.It adopts self-adaptation to lose system in advance and compensates location, vehicle GPS position, and then the positional information of better transmission vehicle mounted terminal collection; Device can effectively suppress the out of band spectrum of BOC signal to be expanded, and reduces out-of-band distortion, optimizes planisphere, reduces inband distortion, can eliminate the distortion effect of navigation channels to BOC signal well, have great significance in satellite navigation system.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, makes a variety of changes under can also or else departing from the prerequisite of present inventive concept.
Claims (5)
1. the vehicle mounted guidance channel self-adapting system based on predistorter, it is characterized in that: comprise micro controller module, GPS module, analog-to-digital conversion module, power module, prefilter, Frequency Hopping Signal processor, error processor, chronotron, predistorter, postfilter, antenna, described GPS module connects micro controller module by analog-to-digital conversion module, and described micro controller module connects antenna by prefilter, Frequency Hopping Signal processor, error processor, predistorter, postfilter successively; Described chronotron is connected with error processor, predistorter respectively, and described power module is connected with micro controller module, GPS module, analog-to-digital conversion module, prefilter, Frequency Hopping Signal processor, error processor, chronotron, predistorter, postfilter respectively;
Described predistorter comprises magnitude extraction module, core look-up table obtains and call unit, complex multiplication module, complex addition module and the DSP for store look-up tables data, it is RAM storer that described core look-up table obtains with call unit, described magnitude extraction module, core look-up table obtains and call unit, complex multiplication module and complex addition module are all integrated on FPGA, look-up table data to be injected the RAM storer on FPGA by described DSP by data bus, according to the amplitude index that described magnitude extraction module obtains, the look-up table data in RAM storer is read in real time.
2. a kind of vehicle mounted guidance channel self-adapting system based on predistorter according to claim 1, is characterized in that: described micro controller module adopts AVR series monolithic.
3. a kind of vehicle mounted guidance channel self-adapting system based on predistorter according to claim 1, is characterized in that: described GPS module adopts the SIFEIII of Gstar company for GS-15B module.
4. a kind of vehicle mounted guidance channel self-adapting system based on predistorter according to claim 1, is characterized in that: the chip model of described analog-to-digital conversion module is ADC0804.
5. a kind of vehicle mounted guidance channel self-adapting system based on predistorter according to claim 1, is characterized in that: described power module adopts storage battery power supply.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510547986.9A CN105116427A (en) | 2015-08-31 | 2015-08-31 | Vehicle-mounted navigation channel adaptive system based on pre-distorter |
| PCT/CN2015/098422 WO2017036002A1 (en) | 2015-08-31 | 2015-12-23 | Vehicle-mounted navigation channel adaptive system based on pre-distorter |
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| CN201510547986.9A CN105116427A (en) | 2015-08-31 | 2015-08-31 | Vehicle-mounted navigation channel adaptive system based on pre-distorter |
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Cited By (2)
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| WO2017036002A1 (en) * | 2015-08-31 | 2017-03-09 | 尤为 | Vehicle-mounted navigation channel adaptive system based on pre-distorter |
| CN111181499A (en) * | 2020-01-17 | 2020-05-19 | 南通大学 | Digital predistortion adaptive processing method and system for sea area access equipment |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110456397B (en) * | 2019-07-29 | 2021-02-09 | 桂林电子科技大学 | Multi-antenna ultra-short baseline positioning monitoring method and device and storage medium |
| CN112068159B (en) * | 2020-08-25 | 2024-03-26 | 西安空间无线电技术研究所 | On-orbit optimization method for navigation satellite signal quality |
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Cited By (2)
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| CN111181499A (en) * | 2020-01-17 | 2020-05-19 | 南通大学 | Digital predistortion adaptive processing method and system for sea area access equipment |
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| WO2017036002A1 (en) | 2017-03-09 |
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