CN111142131A - Beidou satellite receiver - Google Patents
Beidou satellite receiver Download PDFInfo
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- CN111142131A CN111142131A CN201911419291.7A CN201911419291A CN111142131A CN 111142131 A CN111142131 A CN 111142131A CN 201911419291 A CN201911419291 A CN 201911419291A CN 111142131 A CN111142131 A CN 111142131A
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- 230000002401 inhibitory effect Effects 0.000 claims description 6
- 238000010897 surface acoustic wave method Methods 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/243—Demodulation of navigation message
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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
- G01S19/42—Determining position
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- Noise Elimination (AREA)
Abstract
According to the Beidou satellite receiver provided by the embodiment of the invention, the design of the radio frequency receiver chip adopts an image rejection architecture. Because the image rejection architecture avoids both image frequency problems and mixing spurs that must be handled specifically in superheterodyne receivers, and even order distortion, dc offset, and flicker noise present in zero-if architectures, the dc offset and flicker noise will not interfere with the desired frequency because the if frequency is far beyond the noise corner frequency. The image rejection architecture does not need to design a filter separately to reject the image frequency, and avoids the problem of image rejection occurring at the same time when a signal receiving channel is selected.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the field of aerospace, and particularly relates to a Beidou satellite receiver.
[ background of the invention ]
A radio frequency receiver in a traditional satellite positioning receiver adopts a filter to inhibit image frequency, and after the filter is selected, the problems of even-order distortion, direct current offset and flicker noise can occur in the down-conversion process. The embodiment of the invention provides a Beidou satellite receiver.
[ summary of the invention ]
The invention aims to solve the problems that a radio frequency receiver in a traditional satellite positioning receiver adopts a filter to inhibit image frequency, and even-order distortion, direct current offset and flicker noise can occur in the down-conversion process after the filter is selected. The embodiment of the invention provides a Beidou satellite receiver.
To achieve the above object, an embodiment of the present invention provides a method, including: the system comprises an antenna module, a radio frequency receiver, a digital signal processing system and a radio frequency front end; the antenna module is used for sensing free space radiation electromagnetic waves and converting the free space radiation electromagnetic waves into radio frequency signals, and has the functions of inhibiting out-of-band interference signal power and providing in-band signal gain; the radio frequency front section is used for reducing the power loss of the radio frequency signal in the transmission process, and inducing and amplifying the radio frequency signal; the radio frequency receiver is used for receiving the radio frequency signals conducted by the antenna, converting the radio frequency signals into digital intermediate frequency signals and outputting the digital intermediate frequency signals in real time; the digital signal processing system extracts the positioning information in the digital intermediate frequency signal and calculates the carrier state in real time; the radio frequency receiver architecture comprises: a superheterodyne receiver, a direct down-conversion receiver, an image rejection low intermediate frequency receiver; the radio frequency receiver adopts an image rejection architecture; the superheterodyne receiver mixes the locally generated oscillation wave with the radio frequency signal to obtain an intermediate frequency signal, wherein the intermediate frequency signal is lower than the frequency of an original signal; the direct down-conversion receiver converts the intermediate frequency signals to intermediate frequency, and performs digital down-conversion on the intermediate frequency signals to generate digital intermediate frequency signals; the image rejection low intermediate frequency receiver filters out image components in the digital intermediate frequency signal.
Further, the antenna module comprises an antenna, a surface acoustic wave filter and a low noise amplifier; the antenna is used for inducing free space radiation electromagnetic waves and converting the electromagnetic waves into radio frequency signals; the surface acoustic wave filter is used for selecting a frequency band of the radio frequency signal and inhibiting the power of an out-of-band interference signal so as to avoid nonlinear saturation distortion of the low noise amplifier; the low noise amplifier belongs to an inner stage of the antenna module for providing in-band signal gain.
Further, the radio frequency front end comprises: an impedance matching network, an external low noise amplifier; the impedance matching network is used for reducing power loss between the antenna and the external low noise amplifier; the low noise amplifier is arranged at the front end of the radio frequency receiver and is used for sensing and amplifying the radio frequency signals conducted by the antenna.
Furthermore, the digital signal processing system comprises an adaptive anti-interference filter, a baseband signal processor and a central processing unit; the self-adaptive anti-interference filter carries out interference filtering processing on the digital intermediate frequency signal output by the radio frequency receiver to generate a filtering signal; the baseband signal processor receives the filtered signal; the software program executed by the central processing unit cooperates with the baseband signal processor to jointly complete the signal processing algorithms of satellite channel allocation and configuration, acquisition, tracking, text demodulation, signal-to-noise ratio estimation and the like of each satellite channel.
Further, in the Beidou satellite receiver provided by the embodiment of the invention, the design of the radio frequency receiver chip adopts an image rejection architecture. Because the image rejection architecture avoids both image frequency problems and mixing spurs that must be handled specifically in superheterodyne receivers, and even order distortion, dc offset, and flicker noise present in zero-if architectures, the dc offset and flicker noise will not interfere with the desired frequency because the if frequency is far beyond the noise corner frequency. The image rejection architecture does not need to design a filter separately to reject the image frequency, and avoids the problem of image rejection occurring at the same time when a signal receiving channel is selected.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a system structure of a Beidou satellite receiver.
Fig. 2 is a schematic diagram of image rejection.
[ detailed description ] embodiments
The invention aims to solve the problems that a radio frequency receiver in a traditional satellite positioning receiver adopts a filter to inhibit image frequency, and even-order distortion, direct current offset and flicker noise can occur in the down-conversion process after the filter is selected. The embodiment of the invention provides a Beidou satellite receiver. The simultaneous image rejection problem on the selected signal reception channel can be avoided.
Example 1
Referring to fig. 1, the present embodiment provides a beidou satellite receiver, including: the system comprises an antenna module, a radio frequency receiver, a digital signal processing system and a radio frequency front end; the antenna module is used for sensing free space radiation electromagnetic waves and converting the free space radiation electromagnetic waves into radio frequency signals, and has the functions of inhibiting out-of-band interference signal power and providing in-band signal gain; the radio frequency front section is used for reducing the power loss of the radio frequency signal in the transmission process, and inducing and amplifying the radio frequency signal; the radio frequency receiver is used for receiving the radio frequency signals conducted by the antenna, converting the radio frequency signals into digital intermediate frequency signals and outputting the digital intermediate frequency signals in real time; the digital signal processing system extracts the positioning information in the digital intermediate frequency signal and calculates the carrier state in real time; the radio frequency receiver architecture comprises: a superheterodyne receiver, a direct down-conversion receiver, an image rejection low intermediate frequency receiver; the radio frequency receiver adopts an image rejection architecture; the superheterodyne receiver mixes the locally generated oscillation wave with the radio frequency signal to obtain an intermediate frequency signal, wherein the intermediate frequency signal is lower than the frequency of an original signal; the direct down-conversion receiver converts the intermediate frequency signals to intermediate frequency, and performs digital down-conversion on the intermediate frequency signals to generate digital intermediate frequency signals; the image rejection low intermediate frequency receiver filters out image components in the digital intermediate frequency signal.
Furthermore, the positioning chip of the digital processing system adopts a 55nm process technology, takes an excellent GNSS signal processing engine and a high-performance microprocessor as a system core, uses a multi-channel multiplexing architecture, and has rich storage resources, scientific capture strategy and stable tracking performance. The high dynamic software carried by the positioning chip is based on an excellent hard real-time operating system, is stably output at 10Hz, and is low in delay, high in precision and accurate in speed measurement in a high dynamic flight state. An anti-interference subsystem taking a self-adaptive notch filter as a core is further integrated in the positioning chip, the anti-interference subsystem can deal with strong narrow-band radio frequency interference, the Beidou satellite receiver processes GNSS satellite broadcast signals of a B1 frequency point, the spread spectrum code rate of the signals is 10.23MHz, and the zero bandwidth is 20.46 MHz. Compared with a GPS L1 signal, the B1 spread spectrum code rate is increased by 10 times, and great benefits are brought to the performance of the Beidou B1 receiver. For example, the method can better suppress narrow-band radio frequency interference, and improves the interference suppression capability by 10dB relative to the GPS L1. In addition, the longer pseudo-random noise code is close to a noise signal, has better randomness, also has lower correlation side lobe, the capturing and tracking performance is improved to a certain extent, and the ranging precision and the anti-multipath capability are improved.
Further, the antenna module comprises an antenna, a surface acoustic wave filter and a low noise amplifier; the antenna is used for inducing free space radiation electromagnetic waves and converting the electromagnetic waves into radio frequency signals; the surface acoustic wave filter is used for selecting a frequency band of the radio frequency signal and inhibiting the power of an out-of-band interference signal so as to avoid nonlinear saturation distortion of the low noise amplifier; the low noise amplifier belongs to an inner stage of the antenna module for providing in-band signal gain.
Further, the radio frequency front end comprises: an impedance matching network, an external low noise amplifier; the impedance matching network is used for reducing power loss between the antenna and the external low noise amplifier; the low noise amplifier is arranged at the front end of the radio frequency receiver and is used for sensing and amplifying the radio frequency signals conducted by the antenna.
Furthermore, the digital signal processing system comprises an adaptive anti-interference filter, a baseband signal processor and a central processing unit; the self-adaptive anti-interference filter carries out interference filtering processing on the digital intermediate frequency signal output by the radio frequency receiver to generate a filtering signal; the baseband signal processor receives the filtered signal; the software program executed by the central processing unit cooperates with the baseband signal processor to jointly complete the signal processing algorithms of satellite channel allocation and configuration, acquisition, tracking, text demodulation, signal-to-noise ratio estimation and the like of each satellite channel.
Furthermore, the Beidou B1 high dynamic positioning software developed by taking the baseband signal processor as a core is a multitask navigation positioning program set. The software is based on a real-time microkernel operating system, with compiled instructions being executed by a high-performance microprocessor integrated in the hardware. In a positioning software system, a capturing and tracking task cooperates with a baseband signal processor to realize signal detection and processing such as capturing, bit synchronization, tracking and the like, and independently complete frame synchronization. In the positioning software, a Beidou B1 navigation task executes navigation message decoding, satellite orbit determination, pseudo-range measurement, carrier position and speed calculation and receiver time service.
Further, in the Beidou satellite receiver provided by the embodiment of the invention, the design of the radio frequency receiver chip adopts an image rejection architecture. Because the image rejection architecture avoids both image frequency problems and mixing spurs that must be handled specifically in superheterodyne receivers, and even order distortion, dc offset, and flicker noise present in zero-if architectures, the dc offset and flicker noise will not interfere with the desired frequency because the if frequency is far beyond the noise corner frequency. The image rejection architecture does not need to design a filter separately to reject the image frequency, and avoids the problem of image rejection occurring at the same time when a signal receiving channel is selected.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (4)
1. A Beidou satellite receiver is characterized by comprising: the system comprises an antenna module, a radio frequency receiver, a digital signal processing system and a radio frequency front end;
the antenna module is used for sensing free space radiation electromagnetic waves and converting the free space radiation electromagnetic waves into radio frequency signals, and has the functions of inhibiting out-of-band interference signal power and providing in-band signal gain;
the radio frequency front section is used for reducing the power loss of the radio frequency signal in the transmission process, and inducing and amplifying the radio frequency signal;
the radio frequency receiver is used for receiving the radio frequency signals conducted by the antenna, converting the radio frequency signals into digital intermediate frequency signals and outputting the digital intermediate frequency signals in real time;
the digital signal processing system extracts the positioning information in the digital intermediate frequency signal and calculates the carrier state in real time;
the radio frequency receiver architecture comprises: a superheterodyne receiver, a direct down-conversion receiver, an image rejection low intermediate frequency receiver;
the radio frequency receiver adopts an image rejection architecture;
the superheterodyne receiver mixes the locally generated oscillation wave with the radio frequency signal to obtain an intermediate frequency signal, wherein the intermediate frequency signal is lower than the frequency of an original signal;
the direct down-conversion receiver converts the intermediate frequency signals to intermediate frequency, and performs digital down-conversion on the intermediate frequency signals to generate digital intermediate frequency signals;
the image rejection low intermediate frequency receiver filters out image components in the digital intermediate frequency signal.
2. The Beidou satellite receiver according to claim 1, wherein the antenna module comprises an antenna, a surface acoustic wave filter, a low noise amplifier;
the antenna is used for inducing free space radiation electromagnetic waves and converting the electromagnetic waves into radio frequency signals;
the surface acoustic wave filter is used for selecting a frequency band of the radio frequency signal and inhibiting the power of an out-of-band interference signal so as to avoid nonlinear saturation distortion of the low noise amplifier;
the low noise amplifier belongs to an inner stage of the antenna module for providing in-band signal gain.
3. The Beidou satellite receiver of claim 1, wherein the radio frequency front end comprises: an impedance matching network, an external low noise amplifier;
the impedance matching network is used for reducing power loss between the antenna and the external low noise amplifier;
the low noise amplifier is arranged at the front end of the radio frequency receiver and is used for sensing and amplifying the radio frequency signals conducted by the antenna.
4. The Beidou satellite receiver according to claim 1, wherein the digital signal processing system comprises an adaptive antijam filter, a baseband signal processor and a central processing unit;
the self-adaptive anti-interference filter carries out interference filtering processing on the digital intermediate frequency signal output by the radio frequency receiver to generate a filtering signal;
the baseband signal processor receives the filtered signal;
the software program executed by the central processing unit cooperates with the baseband signal processor to jointly complete the signal processing algorithms of satellite channel allocation and configuration, acquisition, tracking, text demodulation, signal-to-noise ratio estimation and the like of each satellite channel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911419291.7A CN111142131A (en) | 2019-12-31 | 2019-12-31 | Beidou satellite receiver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911419291.7A CN111142131A (en) | 2019-12-31 | 2019-12-31 | Beidou satellite receiver |
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| CN111142131A true CN111142131A (en) | 2020-05-12 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE396460A (en) * | 1932-05-25 | 1933-06-30 | ||
| CN201479126U (en) * | 2009-09-09 | 2010-05-19 | 朱辉 | Beidou full-functional highly-integrated reception and transmitting component |
| CN101872008A (en) * | 2009-04-21 | 2010-10-27 | 中国人民解放军理工大学 | Beidou satellite navigation system receiving module |
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2019
- 2019-12-31 CN CN201911419291.7A patent/CN111142131A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE396460A (en) * | 1932-05-25 | 1933-06-30 | ||
| CN101872008A (en) * | 2009-04-21 | 2010-10-27 | 中国人民解放军理工大学 | Beidou satellite navigation system receiving module |
| CN201479126U (en) * | 2009-09-09 | 2010-05-19 | 朱辉 | Beidou full-functional highly-integrated reception and transmitting component |
Non-Patent Citations (1)
| Title |
|---|
| 周建政;王志功;李莉;王科平;: "宽带无线接收机射频前端结构研究与设计" * |
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