CN109143288B - Radio frequency processing device and method applied to occultation detection system - Google Patents
Radio frequency processing device and method applied to occultation detection system Download PDFInfo
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- CN109143288B CN109143288B CN201811162227.0A CN201811162227A CN109143288B CN 109143288 B CN109143288 B CN 109143288B CN 201811162227 A CN201811162227 A CN 201811162227A CN 109143288 B CN109143288 B CN 109143288B
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- 238000012545 processing Methods 0.000 title claims abstract description 75
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 13
- 238000003672 processing method Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000005433 ionosphere Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Classifications
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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
Abstract
The embodiment of the invention discloses a radio frequency processing device and a radio frequency processing method applied to a occultation detection system. The radio frequency processing device comprises: the amplifying circuit, the power dividing circuit, the frequency selecting filter and the radio frequency chip; the power dividing circuit is respectively connected with the amplifying circuit and the frequency selecting filter, and the frequency selecting filter is connected with the radio frequency chip; the power division circuit is used for performing power division on the radio frequency signals output by the amplifying circuit to obtain multiple paths of radio frequency signals, and inputting the multiple paths of radio frequency signals to corresponding frequency selection filters respectively; the frequency selecting filter is used for selecting frequencies of corresponding frequency points of the received radio frequency signals and inputting the signals of the corresponding frequency points to the radio frequency chip; and the radio frequency chip is used for performing intermediate frequency processing according to the received signals to obtain digital intermediate frequency signals. The present embodiment expands the signal frequency range; by processing multiple frequency bins simultaneously.
Description
Technical Field
The embodiment of the invention relates to a space detection technology, in particular to a radio frequency processing device and a radio frequency processing method applied to a occultation detection system.
Background
With the perfection of the global navigation satellite system (Global Navigation Satellite System, GNSS), the GNSS remote sensing technology has been developed and developed. GNSS remote sensing technology is to invert meteorological elements such as the earth atmosphere by utilizing the changes of physical quantities such as amplitude, phase and the like of the reflected signals when radio waves are transmitted in the earth atmosphere. In the process of GNSS occultation events, GNSS navigation signals passing through the earth atmosphere profile are affected by the water vapor density, the electron density and the like of the atmosphere layer to generate propagation characteristic changes, and the neutral atmosphere temperature wet pressure profile with the height of 0 km-60 km and the ionosphere electron density profile with the height of 90 km-satellite can be obtained by processing the amplitude and phase delay information of GNSS occultation observation data. The GNSS occultation detection technology can be used for detecting the earth atmosphere, has the advantages of high precision, high vertical resolution, long-term stability, global coverage, all-weather detection and the like, and the detection data has important scientific significance on digital weather forecast, climate and global change research, near space environment monitoring and research and the like.
Since the successful implementation of the GPS/MET occultation program in the united states in 1995, multiple countries compete to develop their own occultation program, and more than 20 occultation programs, such as COSMIC, CHAMP, metOp-a, have been implemented. The occultation detection system generally comprises an antenna, a radio frequency processing device and an occultation processing device, wherein the radio frequency processing device is used for performing intermediate frequency processing on GNSS signals received by the antenna, and inputting the obtained intermediate frequency signals to the occultation processing device to obtain detection results. With the development of the GNSS technology, the frequency range of GNSS signals is wider and wider, the processing precision requirement on the GNSS signals is higher and higher, the frequency range of signals which can be processed by the existing radio frequency processing device is limited, and the processing precision is lower.
Disclosure of Invention
The embodiment of the invention provides a radio frequency processing device and a radio frequency processing method applied to a occultation detection system, which are used for expanding the frequency range of signals and improving the data processing precision.
In a first aspect, an embodiment of the present invention provides a radio frequency processing apparatus applied to a occultation detection system, including: the amplifying circuit, the power dividing circuit, the frequency selecting filter and the radio frequency chip;
the power dividing circuit is respectively connected with the amplifying circuit and the frequency selecting filter, and the frequency selecting filter is connected with the radio frequency chip;
the power dividing circuit is used for performing power division on the radio frequency signals output by the amplifying circuit to obtain multiple paths of radio frequency signals, and the multiple paths of radio frequency signals are respectively input to the corresponding frequency selection filters;
the frequency selection filter is used for selecting frequencies of corresponding frequency points of the received radio frequency signals and inputting the signals of the corresponding frequency points to the radio frequency chip;
the radio frequency chip is used for performing intermediate frequency processing according to the received signals to obtain digital intermediate frequency signals.
In a second aspect, an embodiment of the present invention further provides a radio frequency processing method, where the method includes:
the power dividing circuit in the radio frequency processing device performs power division on the radio frequency signals output by the amplifying circuit to obtain multiple paths of radio frequency signals, and the multiple paths of radio frequency signals are respectively input to the corresponding frequency selection filters;
the frequency selecting filter in the radio frequency processing device performs frequency selection of a corresponding frequency point on the received radio frequency signal and inputs the signal of the corresponding frequency point to the radio frequency chip;
and the radio frequency chip in the radio frequency processing device performs intermediate frequency processing according to the received signals to obtain digital intermediate frequency signals.
In the embodiment of the invention, the radio frequency signal is amplified, divided and filtered through the amplifying circuit, the power dividing circuit and the frequency selecting filter, so that a plurality of frequency points can be selected from the radio frequency signal amplified by the amplifying circuit at the same time; the intermediate frequency processing of the radio frequency chip can process a plurality of frequency points simultaneously and obtain digital intermediate frequency signals corresponding to the plurality of frequency points, so that the frequency range of the signals is enlarged; in addition, by processing a plurality of frequency points simultaneously, the intermediate frequency processing efficiency is improved, the data processing precision is improved, and the system errors and errors related to signal propagation are reduced, so that the working requirements of positioning and occultation detection are met.
Drawings
Fig. 1a is a schematic structural diagram of a radio frequency processing apparatus according to a first embodiment of the present invention;
fig. 1b is a schematic structural diagram of another rf processing apparatus according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a radio frequency processing device according to a third embodiment of the present invention;
fig. 3 is a flowchart of a radio frequency processing method according to a fourth embodiment of the present invention.
10, an amplifying circuit; 101. a first amplifying circuit; 102. a second amplifying circuit; 103. a third amplifying circuit; 11. a filter circuit; 20. a power dividing circuit; 201. a first power dividing circuit; 202. a second power dividing circuit; 203. a third power dividing circuit; 30. a frequency selective filter; 301. a first filter; 302. a second filter; 303. a third filter; 304. a fourth filter; 40. a radio frequency chip; 401. a GPS special radio frequency chip; 402. a BD special radio frequency chip; 50. positioning an antenna; 60. a forward occultation receiving antenna; 70. a backward occultation receiving antenna; 80. a connector; 90. and the star masking processing device.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1a is a schematic structural diagram of a radio frequency processing device according to an embodiment of the present invention, where the radio frequency processing device according to the present embodiment may be applied to a occultation detection system, and the occultation detection system may be applied to an aerostat. Aerostats generally refer to aerostats lighter than air in specific gravity that rise by atmospheric buoyancy, including but not limited to tethered balloons and airships, including general airships, stratospheric airships, near-space airships, and the like. Preferably, the aerostat is typically a small aerostat.
Referring to fig. 1a, the radio frequency processing apparatus includes an amplifying circuit 10, a power dividing circuit 20, a frequency selecting filter 30, and a radio frequency chip 40. The power dividing circuit 20 is connected with the amplifying circuit 10 and the frequency selecting filter 30 respectively, and the frequency selecting filter 30 is connected with the radio frequency chip 40.
Optionally, the number of the amplifying circuits 10 is plural, and input ends of the amplifying circuits 10 are respectively connected to antennas in the occultation detection system, for example, the positioning antenna 50 and the occultation receiving antenna, so as to amplify radio frequency signals received by the positioning antenna 50 and the occultation receiving antenna.
Alternatively, the amplifying circuit 10 is a multi-stage amplifying circuit, for example, a two-stage amplifying circuit. In one application scenario, as shown in fig. 1b, the positioning antenna 50, the forward occultation receiving antenna 60, and the backward occultation receiving antenna 70 are single-radio frequency channels. The number of the radio frequency processing devices is 3, and the 3 radio frequency processing devices comprise a positioning processing device for processing the GNSS satellite direct signals output by the positioning antenna 50; the forward radio frequency processing device processes the GNSS mask signals output by the forward mask receiving antenna 60, and the backward radio frequency processing device processes the GNSS mask signals output by the backward mask receiving antenna 70. Optionally, the forward radio frequency processing device and the backward radio frequency processing device are identical.
The first amplifying circuit 101 in the positioning processing device is connected with the positioning antenna 50, the second amplifying circuit 102 in the forward radio frequency processing device is connected with the forward occultation receiving antenna 60, and the third amplifying circuit 103 in the backward radio frequency processing device is connected with the backward occultation receiving antenna 70. The three amplifying circuits are used for amplifying the radio frequency signals received by the corresponding antennas, namely GNSS satellite direct signals or GNSS occultation signals. Optionally, a connector 80, such as an SMA connector, is also connected between the amplifying circuit 10 and the antenna.
The amplifying circuit 10 amplifies the received rf signal and inputs the amplified rf signal to the power dividing circuit 20. The power dividing circuit 20 is configured to perform power division on the radio frequency signal output by the amplifying circuit 10, obtain multiple radio frequency signals, and input the multiple radio frequency signals to the corresponding frequency selecting filters 30 respectively.
In this embodiment, the power dividing circuit 20 divides N radio frequency signals, and the N radio frequency signals are respectively input to N frequency selective filters 30. The frequency selection points of the N frequency selection filters 30 are different, and N is a natural number. Based on this, a plurality of frequency points can be simultaneously selected from the radio frequency signal amplified by the amplifying circuit 10. The frequency selection filter 30 is configured to perform frequency selection of a corresponding frequency point on the received radio frequency signal, and input the signal of the corresponding frequency point to the radio frequency chip 40.
Next, in the above application scenario, referring to fig. 1b, the first amplifying circuit 101 is connected to the first power dividing circuit 201, the second amplifying circuit 102 is connected to the second power dividing circuit 202, and the third amplifying circuit 103 is connected to the third power dividing circuit 203. Each power dividing circuit is connected with a first filter 301, a second filter 302, a third filter 303 and a fourth filter 304. The frequency selective filters 30 are all connected with the radio frequency chip 40.
The rf chip 40 is configured to perform intermediate frequency processing according to the received signal, so as to obtain a digital intermediate frequency signal.
Optionally, the radio frequency chip 40 integrates a mixer, an intermediate frequency low-pass filter, a variable gain amplifier, a frequency synthesizer and an analog-to-digital converter, and is used for performing down-conversion and AD sampling processing on the signal output by the frequency selection filter 30 to obtain a digital intermediate frequency signal. In the occultation detection system, the RF chip 40 inputs the digital intermediate frequency signal to the occultation processing device 90.
It should be noted that the number of the amplifying circuit 10, the power dividing circuit 20, the frequency selecting filter 30 and the radio frequency chip 40 in the present embodiment is not limited. In general, the amplifying circuits 10 are connected to the antennas in a one-to-one correspondence manner, the power dividing circuits 20 are connected to the amplifying circuits 10 in a one-to-one correspondence manner, the number of the frequency selecting filters 30 is the same as the number of the signals divided by the power, and the number of the radio frequency chips 40 is generally determined by the functional requirements, which is not limited in this embodiment.
In this embodiment, the amplifying circuit, the power dividing circuit and the frequency selecting filter amplify, divide and filter the radio frequency signal, so that a plurality of frequency points can be selected from the radio frequency signal amplified by the amplifying circuit at the same time; the intermediate frequency processing of the radio frequency chip can process a plurality of frequency points simultaneously and obtain digital intermediate frequency signals corresponding to the plurality of frequency points, so that the frequency range of the signals is enlarged; in addition, by processing a plurality of frequency points simultaneously, the intermediate frequency processing efficiency is improved, the data processing precision is improved, and the system errors and errors related to signal propagation are reduced, so that the working requirements of positioning and occultation detection are met.
Example two
Continuing with fig. 1b, power splitting circuit 20 includes a quarter-divide power splitter; the quarter-divided power divider is connected to a first filter 301, a second filter 302, a third filter 303, and a fourth filter 304, respectively, in the frequency selective filter 30.
Optionally, the frequency range of the power dividing circuit 20 is wider, which is 1215 MHz-1900 MHz; the isolation degree is strong: typical value 23dB; the insertion loss is small: a typical value is 0.7dB.
Preferably, the first filter 301 selects a global positioning system (Global Positioning System, GPS) satellite signal 1575.42±10.23MHz (L1) frequency point; the second filter 302 selects a frequency point of 1227.6+ -10.23 MHz (L2) of the GPS satellite signal; the third filter 303 selects the frequency point of Beidou (BD) 1561.098 +/-2.046 MHz (B1); the fourth filter 304 selects the BD 1207.14+ -10.23 MHz (B2) frequency bin.
To process radio frequency signals from GPS and BD, the radio frequency chip 40 includes a GPS-specific radio frequency chip 401 and a BD-specific radio frequency chip 402. Optionally, both the GPS-specific radio frequency chip 401 and the BD-specific radio frequency chip 402 include a dual channel radio frequency circuit. The dual-channel radio frequency circuit of the GPS dedicated radio frequency chip 401 includes an L1-channel radio frequency circuit and an L2-channel radio frequency circuit. The dual channel rf circuitry of BD specific rf chip 402 includes B1 channel rf circuitry and B2 channel rf circuitry.
The first filter 301 and the second filter 302 are connected to a GPS-dedicated radio frequency chip 401, and the third filter 303 and the fourth filter 304 are connected to a BD-dedicated radio frequency chip 402.
In this embodiment, the frequency range of the power dividing circuit is wider, the isolation is strong, and the insertion loss is small. The frequency points of the GPS L1L 2 frequency points BD B1B 2 can be processed simultaneously through 4 frequency selection filters. The radio frequency processing device is compatible with GPS and BDS navigation systems, and the detection capability is improved.
Example III
Fig. 2 is a schematic structural diagram of a radio frequency processing device according to a third embodiment of the present invention. Optionally, a filter circuit 11 is connected to the input of the amplifying circuit 10; alternatively, the amplifying circuit is a low noise amplifier, preferably a multi-stage low noise amplifier, such as a two-stage low noise amplifier.
Referring to fig. 2 and 1b, the radio frequency processing apparatus includes: filter circuit 11, amplifying circuit: low noise amplifier (Low Noise Amplifier, LNA) 10, power division circuit: a quarter-divide power divider 20, 4 frequency selective filters 30 and 2 radio frequency chips 40. The 4 frequency selective filters are the first filter 301, the second filter 302, the third filter 303 and the fourth filter 304 in the above embodiment, and the frequency points of the GPS L1, L2, BD B1 and B2 are selected respectively. Optionally, the BD B1, B2 frequency points include the beidou 2 nd generation BD 2B 1, B2 frequency points. The 2 rf chips 40 are the GPS-dedicated rf chip 401 and the BD-dedicated rf chip 402 in the above-described embodiment, respectively.
The LNA is a wideband device, the working frequency range is 0.500 GHz-2.2 GHz, namely the LNA has amplifying capability in the working frequency range, and the filter circuit 11 is selected at the front end of the LNA to realize out-of-band interference suppression in order to ensure that the LNA normally works in BD or GPS signal bands and is not saturated due to interference signals.
Preferably, in order to make the occultation detection system suitable for more aerostats, more occultation events are received, and the radio frequency processing device is arranged on a smaller board, for example, 10 cm×10 cm. Optionally, the low noise amplifier completes the low noise amplifying function of the GPS L1, L2, BD 2B 1 and B2 signals, and the indexes of the low noise amplifier meet the requirements of the pre-amplifier on the technical indexes such as signal gain, noise coefficient, power consumption and the like.
Alternatively, the GPS-specific RF chip and the BD-specific RF chip employ XN117-2.
Example IV
Fig. 3 is a flowchart of a radio frequency processing method according to a fourth embodiment of the present invention, where the present embodiment is applicable to a case of performing intermediate frequency processing on a radio frequency signal, and the method may be performed by the radio frequency processing device according to any one of the foregoing embodiments, and the radio frequency processing device may be applied to a occultation detection system, and specifically includes the following steps:
s110, a power dividing circuit in the radio frequency processing device performs power division on the radio frequency signals output by the amplifying circuit to obtain multiple paths of radio frequency signals, and the multiple paths of radio frequency signals are respectively input to corresponding frequency selection filters.
And S120, the frequency selection filter in the radio frequency processing device performs frequency selection of the corresponding frequency point on the received radio frequency signal, and inputs the signal of the corresponding frequency point to the radio frequency chip.
And S130, the radio frequency chip in the radio frequency processing device performs intermediate frequency processing according to the received signals to obtain digital intermediate frequency signals.
In this embodiment, the amplifying circuit, the power dividing circuit and the frequency selecting filter amplify, divide and filter the radio frequency signal, so that a plurality of frequency points can be selected from the radio frequency signal amplified by the amplifying circuit at the same time; the intermediate frequency processing of the radio frequency chip can process a plurality of frequency points simultaneously and obtain digital intermediate frequency signals corresponding to the plurality of frequency points, so that the frequency range of the signals is enlarged; in addition, by processing a plurality of frequency points simultaneously, the intermediate frequency processing efficiency is improved, the data processing precision is improved, and the system errors and errors related to signal propagation are reduced, so that the working requirements of positioning and occultation detection are met.
Alternatively, the frequency range of the power dividing circuit 20 is 1215MHz to 1900MHz.
Optionally, the power dividing circuit 20 includes a divide-by-four power divider; the quarter-divide power divider is connected 304 to the first filter 301, the second filter 302, the third filter 303 and the fourth filter in the frequency selective filter 30, respectively.
Optionally, the first filter 301 selects a frequency point of 1575.42±10.23MHz of the global positioning system GPS satellite signal; the second filter 302 selects the frequency point of the GPS satellite signal 1227.6 plus or minus 10.23 MHz; the third filter 303 selects Beidou BD 1561.098 +/-2.046 MHz frequency points; the fourth filter 304 selects BD 1207.14±10.23MHz frequency bins.
Optionally, the radio frequency chip 40 includes a GPS-specific radio frequency chip 401 and a BD-specific radio frequency chip 402, and the GPS-specific radio frequency chip 401 and the BD-specific radio frequency chip 402 each include a dual-channel radio frequency circuit; the first filter 301 and the second filter 302 are connected to a GPS-dedicated radio frequency chip 401, and the third filter 303 and the fourth filter 304 are connected to a BD-dedicated radio frequency chip 402.
Optionally, the radio frequency chip 40 integrates a mixer, an intermediate frequency low pass filter, a variable gain amplifier, a frequency synthesizer, and an analog to digital converter.
Optionally, the amplifying circuit 10 comprises a low noise amplifier with an operating frequency in the range of 0.500GHz to 2.2GHz.
Optionally, the amplifying circuit 10 further includes: a filter circuit 11 connected to the front end of the low noise amplifier.
Optionally, the input ends of the amplifying circuits 10 are respectively connected to the positioning antenna 50 and the occultation receiving antenna, and the amplifying circuits 10 amplify the radio frequency signals received by the positioning antenna 50 and the occultation receiving antenna.
The method and the device provided by the embodiment of the invention have the corresponding technical characteristics and the technical effects.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (5)
1. A radio frequency processing device for a occultation detection system, comprising: the amplifying circuit, the power dividing circuit, the frequency selecting filter and the radio frequency chip;
the power dividing circuit is respectively connected with the amplifying circuit and the frequency selecting filter, and the frequency selecting filter is connected with the radio frequency chip;
the power dividing circuit is used for performing power division on the radio frequency signals output by the amplifying circuit to obtain multiple paths of radio frequency signals, and the multiple paths of radio frequency signals are respectively input to the corresponding frequency selection filters;
the frequency selection filter is used for selecting frequencies of corresponding frequency points of the received radio frequency signals and inputting the signals of the corresponding frequency points to the radio frequency chip;
the radio frequency chip is used for performing intermediate frequency processing according to the received signals to obtain digital intermediate frequency signals;
the power dividing circuit comprises a one-to-four power divider;
the one-to-four power divider is respectively connected with a first filter, a second filter, a third filter and a fourth filter in the frequency-selective filter;
the radio frequency chip comprises a GPS special radio frequency chip and a BD special radio frequency chip, and the GPS special radio frequency chip and the BD special radio frequency chip both comprise a double-channel radio frequency circuit;
the first filter and the second filter are connected with a GPS special radio frequency chip, and the third filter and the fourth filter are connected with a BD special radio frequency chip;
the amplifying circuit comprises a low-noise amplifier, and the working frequency range is 0.500 GHz-2.2 GHz;
the amplifying circuit further includes: a filter circuit connected to the front end of the low noise amplifier;
the low-noise amplifier is a multi-stage low-noise amplifier;
the first filter selects a GPS satellite signal 1575.42+/-10.23 MHz frequency point;
the second filter selects a frequency point of 1227.6+/-10.23 MHz of a GPS satellite signal;
the third filter selects Beidou BD 1561.098 +/-2.046 MHz frequency points;
and the fourth filter selects BD 1207.14+/-10.23 MHz frequency points.
2. The apparatus of claim 1, wherein the power splitting circuit has a frequency range of 1215mhz to 1900mhz.
3. The apparatus of claim 1, wherein the radio frequency chip integrates a mixer, an intermediate frequency low pass filter, a variable gain amplifier, a frequency synthesizer, and an analog to digital converter.
4. A device according to any one of claims 1-3, wherein the plurality of amplifying circuits have inputs connected to the positioning antenna and the occultation receiving antenna, respectively, and the plurality of amplifying circuits are configured to amplify the radio frequency signals received by the positioning antenna and the occultation receiving antenna.
5. A method of radio frequency processing, comprising:
the power dividing circuit in the radio frequency processing device performs power division on the radio frequency signals output by the amplifying circuit to obtain multiple paths of radio frequency signals, and the multiple paths of radio frequency signals are respectively input to the corresponding frequency selection filters;
the frequency selecting filter in the radio frequency processing device performs frequency selection of a corresponding frequency point on the received radio frequency signal and inputs the signal of the corresponding frequency point to the radio frequency chip;
the radio frequency chip in the radio frequency processing device performs intermediate frequency processing according to the received signals to obtain digital intermediate frequency signals;
the power dividing circuit comprises a one-to-four power divider; the one-to-four power divider is respectively connected with a first filter, a second filter, a third filter and a fourth filter in the frequency-selective filter;
the radio frequency chip comprises a GPS special radio frequency chip and a BD special radio frequency chip, and the GPS special radio frequency chip and the BD special radio frequency chip both comprise a double-channel radio frequency circuit; the first filter and the second filter are connected with a GPS special radio frequency chip, and the third filter and the fourth filter are connected with a BD special radio frequency chip;
the amplifying circuit comprises a low-noise amplifier, and the working frequency range is 0.500 GHz-2.2 GHz;
the amplifying circuit further includes: a filter circuit connected to the front end of the low noise amplifier;
the low-noise amplifier is a multi-stage low-noise amplifier;
the first filter selects a GPS satellite signal 1575.42+/-10.23 MHz frequency point;
the second filter selects a frequency point of 1227.6+/-10.23 MHz of a GPS satellite signal;
the third filter selects Beidou BD 1561.098 +/-2.046 MHz frequency points;
and the fourth filter selects BD 1207.14+/-10.23 MHz frequency points.
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| CN208902880U (en) * | 2018-09-30 | 2019-05-24 | 中国气象局气象探测中心 | Radio frequency handling device applied to LEO occultation system |
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| CN109143288A (en) | 2019-01-04 |
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