CN215932149U - Big dipper dual antenna transceiver module - Google Patents
Big dipper dual antenna transceiver module Download PDFInfo
- Publication number
- CN215932149U CN215932149U CN202121284018.0U CN202121284018U CN215932149U CN 215932149 U CN215932149 U CN 215932149U CN 202121284018 U CN202121284018 U CN 202121284018U CN 215932149 U CN215932149 U CN 215932149U
- Authority
- CN
- China
- Prior art keywords
- module
- antenna
- rdss
- rnss
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The utility model relates to the technical field of Beidou communication, in particular to a Beidou dual-antenna receiving and transmitting module. The antenna is used for receiving satellite navigation signals; the RDSS module down-converts the RDSS satellite navigation signals received by the antenna into intermediate frequency signals, and analyzes and resolves the frequency-converted navigation information; the RNSS module is used for receiving satellite radio navigation signals and configuring output data through instructions according to requirements; the MCU data processing module performs data interaction and control with the RDSS module and the RNSS module, performs data interaction communication with an external upper computer, analyzes and judges the strength of a received RDSS signal, and controls the microwave switch to select an antenna with a strong received signal as a working antenna. The antenna is matched and connected with two groups of same passive antennas, and the antenna with high signal intensity is automatically selected as a working antenna according to the intensity of the received signal of the antenna.
Description
Technical Field
The utility model relates to the technical field of Beidou communication, in particular to a Beidou dual-antenna receiving and transmitting module.
Background
The Beidou module is an integrated terminal module which is applied to a Beidou satellite navigation system and has the functions of Beidou RDSS positioning, short message communication and the like. The existing Beidou module mainly uses a single passive antenna to receive and transmit Beidou signals, but all 5 satellites with Beidou RDSS service loads are over the equator, and when the Beidou module is used for realizing RDSS services, the receiving and transmitting antenna must face the equator direction, so that the use flexibility is lacked.
The S frequency band is a receiving frequency point of the working of the Beidou module, and the working frequency is 2491.75MHz +/-4.08 MHz. As the frequency spectrum resource of the S frequency band is quite tight, a plurality of services share the frequency band, and the interference of adjacent frequencies mainly comes from the high-end frequency of WIFI (2400 MHz-2483.5 MHz) of a wireless local area network and the low-end frequency of 4G/5G (2515 MHz-2675 MHz) of a mobile phone. The existing Beidou module does not have the function of resisting adjacent channel interference, so that the Beidou module can work in an electromagnetic complex environment, and the situations of low positioning and communication success rate and unstable working state can occur.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a Beidou dual-antenna transceiving module which can be simultaneously connected with two groups of same passive antennas and can automatically select an antenna with high signal strength as a working antenna according to the signal strength received by the antenna.
In order to achieve the purpose, the utility model provides the following technical scheme:
a big Dipper double-antenna transceiver module,
the antenna is provided with a front antenna and a back antenna and is used for receiving RDSS or RNSS satellite navigation signals;
the RDSS module is used for carrying out down-conversion on the RDSS satellite navigation signals received by the antenna to intermediate-frequency signals and analyzing and resolving the navigation information subjected to the frequency conversion;
the RNSS module is used for receiving satellite radio navigation signals and configuring output data through instructions according to requirements;
the MCU data processing module is used for carrying out data interaction and control with the RDSS module and the RNSS module, simultaneously carrying out data interaction communication with an external upper computer, analyzing and judging the strength of a received RDSS signal, and controlling the microwave switch to select an antenna with strong received signal as a working antenna;
and the power supply processing module is used for accessing an external power supply and supplying power to the RDSS module, the RNSS module and the MCU data processing module.
Furthermore, the RDSS module comprises a Beidou RDSS baseband chip, an RDSS radio frequency chip and a radio frequency front end; the RDSS baseband chip is connected with the RDSS radio frequency chip, the RDSS radio frequency chip is connected with the radio frequency front end, and the radio frequency front end is connected with the antenna through the microwave switch; and the RDSS baseband chip is connected with the MCU data processing module.
Furthermore, an LNA in the RDSS module adopts a high-linearity low-noise chip and a filter, the input end of the PA adopts a sound meter filter, and the output end of the PA adopts a medium low-pass filter; the microwave switch adopts a microwave switch with low loss, high isolation and high bearing power.
Furthermore, the RNSS module comprises an RNSS signal processing module and an RNSS low noise amplifier; the RNSS signal processing module is connected with an RNSS low-noise amplifier, and the RNSS low-noise amplifier is connected with an antenna through a microwave switch; and the RNSS signal processing module is connected with the MCU data processing module.
Further, the RNSS module supports Beidou RNSS-B1 frequency points; the RNSS low-noise amplifier adopts a low-noise MMIC and a sound meter filter; the navigation unit of the RNSS module adopts a GNSS module; the microwave switch adopts a microwave switch with low loss and high isolation.
Further, the acoustic surface filter is replaced by an FBAR filter.
Furthermore, the RDSS module is also provided with an SIM card, and the SIM card is connected with the RDSS baseband chip.
The beneficial effect of this application:
this application can join in marriage simultaneously and connect two sets of same passive antenna, according to the high antenna of antenna received signal strength automatic selection signal intensity as work antenna function, the product adopts integral type structural design, small in size, light in weight, and easy to assemble uses.
The second-stage filter is replaced by the FBAR filter, the cascaded gain and noise coefficient are amplified through calculating the low noise, the influence of WIFI and mobile 4G/5G adjacent frequency can be solved, and the condition that the working state of the Beidou module is unstable in the electromagnetic environment is solved.
Drawings
Fig. 1 is a schematic diagram of the present application.
Fig. 2 is a schematic diagram illustrating an antenna switching principle when the RDSS module is unlocked or has too low signal strength.
Fig. 3 is a schematic diagram illustrating an antenna switching principle in switching when comparing a periodic dual antenna state after RDSS module signal locking according to the present application.
Fig. 4 is a schematic front view of a product according to an embodiment of the present application.
Fig. 5 is a schematic rear view of a product according to an embodiment of the present application.
Fig. 6 is a schematic top view of an article of manufacture in accordance with an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
With the attached drawing, the Beidou antenna transceiver module is an integrated terminal module which is applied to a Beidou satellite navigation system and has the functions of Beidou RNSS positioning, RDSS positioning and short message communication. The wireless sensor network has the functions of RNSS-B1 frequency point positioning, RDSS positioning, short message communication and the like, and has the function of resisting 4G-LTE and WiFi signal interference. The utility model discloses a two antenna transceiver module of big dipper can join in marriage simultaneously and connect two sets of the same passive antenna, according to the high antenna of antenna received signal intensity automatic selection signal intensity as work antenna function, and the product adopts integral type structural design, small in size, light in weight, and easy to assemble uses.
The working principle of the Beidou module is that RDSS satellite navigation signals received by an antenna are down-converted to intermediate frequency signals through the RDSS module, then the navigation information is analyzed and resolved through the RDSS digital processing unit, and finally data are output to the MCU data processing module. The RNSS part uses a mature RNSS module to realize down-conversion, demodulation and calculation of Beidou RNSS satellite navigation signals, and finally positioning data is output to the MCU data processing module, and the MCU data processing module judges the strength of satellite signals in analyzed navigation information so as to select a front antenna or a back antenna as a working antenna.
A big Dipper double-antenna transceiver module,
the antenna is provided with a front antenna and a back antenna and is used for receiving RDSS or RNSS satellite navigation signals;
the RDSS module is used for carrying out down-conversion on the RDSS satellite navigation signals received by the antenna to intermediate-frequency signals and analyzing and resolving the navigation information subjected to the frequency conversion;
the RNSS module is used for receiving satellite radio navigation signals and configuring output data through instructions according to requirements;
the MCU data processing module is used for carrying out data interaction and control with the RDSS module and the RNSS module, simultaneously carrying out data interaction communication with an external upper computer, analyzing and judging the strength of a received RDSS signal, and controlling the microwave switch to select an antenna with strong received signal as a working antenna;
and the power supply processing module is used for accessing an external power supply and supplying power to the RDSS module, the RNSS module and the MCU data processing module.
The RDSS module comprises a Beidou RDSS baseband chip, an RDSS radio frequency chip and a radio frequency front end; the RDSS baseband chip is connected with the RDSS radio frequency chip, the RDSS radio frequency chip is connected with the radio frequency front end, and the radio frequency front end is connected with the antenna through the microwave switch; and the RDSS baseband chip is connected with the MCU data processing module. An LNA in the RDSS module adopts a high-linearity low-noise chip and a filter, the input end of the PA adopts a sound meter filter, and the output end of the PA adopts a medium low-pass filter; the microwave switch adopts a microwave switch with low loss, high isolation and high bearing power. The RDSS module is also provided with an SIM card, and the SIM card is connected with the RDSS baseband chip.
The RNSS module comprises an RNSS signal processing module and an RNSS low noise amplifier; the RNSS signal processing module is connected with an RNSS low-noise amplifier, and the RNSS low-noise amplifier is connected with an antenna through a microwave switch; and the RNSS signal processing module is connected with the MCU data processing module. The RNSS module supports Beidou RNSS-B1 frequency points; the RNSS low-noise amplifier adopts a low-noise MMI C and a sound meter filter; the navigation unit of the RNSS module adopts a GNSS module; the microwave switch adopts a microwave switch with low loss and high isolation.
The acoustic surface filter is replaced with an FBAR filter.
RDSS module scheme
The RDSS module is a scheme of a Beidou RDSS baseband chip, an RDSS radio frequency chip and a radio frequency front end. The RDSS part adopts the existing mature design scheme, the radio frequency front end gives consideration to power consumption and out-of-band interference, the LNA adopts a high-linearity low-noise chip and a filter, the PA input end adopts an acoustic meter filter, and the output end adopts a medium low-pass filter. The RDSS antenna selection part adopts a microwave switch with low loss, high isolation and high bearing power, reduces the loss of radio frequency signals and ensures effective transmission.
RNSS module scheme
The RNSS module adopts mature modular design, supports the Beidou RNSS-B1 frequency point, and can configure output data through instructions according to requirements. The LNA of the RNSS part adopts a low-noise MMIC and a sound meter filter, so that the influence of electromagnetic interference is reduced; the RNSS navigation module adopts a mature GNSS module and can be compatible with a second-generation Beidou data interface protocol. And in the antenna selection part of the RNSS, the microwave switch adopts a low-loss and high-isolation microwave switch, so that the loss of weak radio-frequency signals is reduced.
Data processing module scheme
The MCU data processing module is mainly used for performing data interaction and control with the RDSS module and the RNSS module, performing data interaction communication with an external upper computer, analyzing and judging the strength of a received RDSS signal, and controlling the microwave switch to select an antenna with a strong received signal as a working antenna. The MCU adopts a processor with mature application, small package and low cost, thereby not only meeting the application requirement, but also reducing the board distribution area and lowering the cost.
Big dipper module adopts two sides antenna, and the increase is to the receptivity of signal under different angles. There are two main strategies for antenna switching schemes: under the normal card reading state of the RDSS module, the module switches the antenna according to the signal receiving state of the RDSS module; and when the RDSS module does not read the card, the module switches the antenna according to the signal receiving state of the RNSS module. There are two main stages of antenna switching according to the RDSS module signal: when the RDSS module is unlocked or the strength of the RDSS module is too low, a proper antenna is quickly searched; and the RDSS module locks signals, the strength meets the working requirement, periodic double-antenna state comparison and measurement are carried out, and the signals are selected to be more optimal. The RDSS module antenna switching scheme is as follows:
the antenna switching mode is that the RDSS module performs antenna switching according to the signal receiving state of the RDSS module under the normal card reading state; the method comprises switching when the RDSS module signal is unlocked or the strength is too low and switching when the periodic dual-antenna state is compared after the RDSS module signal is locked.
When the RDSS module signal is unlocked or too low in strength,
and rapidly judging whether the current antenna is used as a working antenna according to the acquired antenna power intensity, wherein the working process is shown in the figure.
The power strength of the current antenna is collected,
whether the signal is locked after a certain period and meets the working requirement is judged,
meeting the working requirement, using the current antenna as the working antenna, and finishing the switching judgment;
the antenna does not meet the working requirement, the antenna is switched to another antenna, the timing is cleared,
acquiring the power intensity of the switched current antenna again;
whether the signal is locked after a certain period and meets the working requirement is judged,
circulating until the working requirement is met, and using the current antenna as a working antenna;
and finishing the switching judgment.
When switching during periodic dual antenna state comparison after RDSS module signal lock,
and switching the antennas according to the acquired current working state of the module, and stopping the antenna switching comparison operation if the module is in a transmitting state. If the antenna is not in a transmitting state and the signal strength is too low, the signal strength of the double antennas is compared once, and a better antenna is selected as a working antenna. The workflow is as shown.
The power strength of the current antenna is collected,
whether a transmitting task exists at present is judged,
if there is a transmission task, the switching is not performed, the switching judgment is finished,
if there is no transmission task, further determining whether the main beam power value reaches the jump value,
if the jump value is not reached, the switching is not performed, the switching judgment is finished,
if the jump value is reached, the main beam power value of the current antenna is saved, the antenna is switched,
collecting the main beam power value of the antenna after switching after a certain period, further judging the relation of the main beam power values of the antenna before and after replacement,
if the main beam power value of the antenna after replacement is smaller than the main beam power value of the antenna before replacement, switching back to the antenna before replacement, ending the switching judgment,
if the power value of the main beam of the antenna after replacement is greater than or equal to the power value of the main beam of the antenna before replacement, the antenna after replacement is used; and finishing the switching judgment.
Design scheme for resisting adjacent frequency
The S frequency point is a receiving frequency point of the working of the Beidou module, and the working frequency is 2491.75MHz +/-4.08 MHz. As the frequency spectrum resource of the S frequency band is quite tight, a plurality of services share the frequency band, and the interference of adjacent frequencies mainly comes from the high-end frequency of WIFI (2400 MHz-2483.5 MHz) of a wireless local area network and the low-end frequency of 4G/5G (2515 MHz-2675 MHz) of a mobile phone. The general Beidou module works in the electromagnetic environment and has the conditions of low positioning and communication success rate and unstable working state.
The S-frequency point low noise amplifier generally comprises a 2-3 level filter and a 2-3 level low noise monolithic microwave integrated circuit, the pre-stage filter preferably considers insertion loss and far-end suppression indexes to ensure the integral acoustic coefficient and far-end suppression of the low noise amplifier, and a band-pass dielectric filter is generally selected. The next two-stage filter preferentially considers the near-end out-of-band rejection index, ensures the near-end rejection of the low-noise amplifier, and generally selects a band-pass surface acoustic wave filter. The 3dB bandwidth of a common sound meter wave filter in an S frequency band is 60 MHz-80 MHz, sidebands of the sound meter wave filter cover the high-end frequency of WIFI (2400 MHz-2483.5 MHz) and the low-end frequency of mobile 4G/5G (2515 MHz-2675 MHz), the suppression degree is about 2dB, and therefore the Beidou module can be influenced by interference under the working environment with the interference signals.
The FBAR filter has good rejection at the high-end frequency of WIFI (2400 MHz-2483.5 MHz) and the low-end frequency of mobile 4G/5G (2515 MHz-2675 MHz), and the rejection is about 40 dB. And replacing the second-stage low-noise amplifier filter with an FBAR filter, and calculating the gain and the noise coefficient of the low-noise amplifier cascade, wherein after the FBAR filter is replaced, the gain of the low-noise amplifier is reduced by about 3dB, and the noise coefficient is increased by about 0.03 dB. Through actual test, the sensitivity of the Beidou module after the FBAR filter is replaced, the test result meets the requirement of-127.6 dBm, and the receiving index of the Beidou module is not influenced. Therefore, the low-noise amplifier circuit of the Beidou module is designed, the second-stage filter is an FBAR filter, and the influence of WIFI and mobile 4G/5G adjacent frequency can be solved. The FBAR filter has good inhibition at the high-end frequency of WIFI (2400 MHz-2483.5 MHz) and the low-end frequency of mobile 4G/5G (2515 MHz-2675 MHz), and the second-stage filter with low noise is replaced by the FBAR filter, so that the problem that the working state of the Beidou module is unstable in the electromagnetic environment can be solved.
Structural process design scheme
In the structural design, in order to prevent electromagnetic interference among all functional units, the structural material is selected from metal materials, the metal materials are machined, and the conductive oxidation process is performed, so that the conductive performance and the oxidation resistance of the metal materials are improved. In order to meet the requirements of a temperature environment and an electromagnetic interference environment, the materials are selected by combining the requirements, and a 5A06 antirust aluminum material is applied, has high strength and corrosion stability, and can reach 300 ℃ at high temperature. The aluminum material also has good electromagnetic shielding effect. The influence of impact vibration is considered to equipment, probably can cause the pine of fastener or the damage of electronic components, has mainly adopted the following several to resist impact and shake the design to this kind of service environment:
1) when all the screws are used, coating 704 silicon rubber on the thread surfaces;
2) the easily damaged components are reinforced by using 704 silicon rubber during final assembly after the test is finished;
3) when the inserted component is electrically mounted, the component is inserted to the bottom, and damage or short circuit of other components caused by displacement of the component during vibration is avoided.
While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A big Dipper double-antenna transceiver module is characterized in that,
the antenna is provided with a front antenna and a back antenna and is used for receiving RDSS or RNSS satellite navigation signals;
the RDSS module is used for carrying out down-conversion on the RDSS satellite navigation signals received by the antenna to intermediate-frequency signals and analyzing and resolving the navigation information subjected to the frequency conversion;
the RNSS module is used for receiving satellite radio navigation signals and configuring output data through instructions according to requirements;
the MCU data processing module is used for carrying out data interaction and control with the RDSS module and the RNSS module, simultaneously carrying out data interaction communication with an external upper computer, analyzing and judging the strength of a received RDSS signal, and controlling the microwave switch to select an antenna with strong received signal as a working antenna;
and the power supply processing module is used for accessing an external power supply and supplying power to the RDSS module, the RNSS module and the MCU data processing module.
2. The big dipper dual antenna transceiver module of claim 1, wherein the RDSS module comprises a big dipper RDSS baseband chip, an RDSS radio frequency chip, a radio frequency front end; the RDSS baseband chip is connected with the RDSS radio frequency chip, the RDSS radio frequency chip is connected with the radio frequency front end, and the radio frequency front end is connected with the antenna through the microwave switch; and the RDSS baseband chip is connected with the MCU data processing module.
3. The big dipper dual antenna transceiver module of claim 2, wherein the LNA in the RDSS module uses a high linearity low noise chip and a filter, the input of the PA uses a sound meter filter, and the output of the PA uses a dielectric low pass filter; the microwave switch adopts a microwave switch with low loss, high isolation and high bearing power.
4. The big dipper dual antenna transceiver module of claim 1, wherein the RNSS module comprises an RNSS signal processing module, an RNSS low noise amplifier; the RNSS signal processing module is connected with an RNSS low-noise amplifier, and the RNSS low-noise amplifier is connected with an antenna through a microwave switch; and the RNSS signal processing module is connected with the MCU data processing module.
5. The big dipper dual antenna transceiver module of claim 4, wherein the RNSS module supports big dipper RNSS-B1 frequency points; the RNSS low-noise amplifier adopts a low-noise MMIC and a sound meter filter; the navigation unit of the RNSS module adopts a GNSS module; the microwave switch adopts a microwave switch with low loss and high isolation.
6. The Beidou dual-antenna transceiver module according to claim 3 or 5, wherein the acoustic surface filter is replaced by an FBAR filter.
7. The big dipper dual antenna transceiver module of claim 1, wherein the RDSS module is further provided with a SIM card, and the SIM card is connected to the RDSS baseband chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121284018.0U CN215932149U (en) | 2021-06-09 | 2021-06-09 | Big dipper dual antenna transceiver module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121284018.0U CN215932149U (en) | 2021-06-09 | 2021-06-09 | Big dipper dual antenna transceiver module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215932149U true CN215932149U (en) | 2022-03-01 |
Family
ID=80402706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121284018.0U Active CN215932149U (en) | 2021-06-09 | 2021-06-09 | Big dipper dual antenna transceiver module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215932149U (en) |
-
2021
- 2021-06-09 CN CN202121284018.0U patent/CN215932149U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8559865B2 (en) | Method and apparatus for providing jammer detection in a receiver | |
| CA2155093C (en) | Half duplex rf transceiver having low transmit path signal loss | |
| JP4485059B2 (en) | Intelligent control of receiver linearity based on interference | |
| US6208849B1 (en) | Receiver with suppressed intermodulation distortion and method for operating the same | |
| CN101308955B (en) | Radio frequency integrated GPS active antenna | |
| CN102832959B (en) | Radio-frequency front end in high and medium frequency superheterodyne+zero intermediate frequency structure | |
| CN208479604U (en) | A kind of broadband two-channel wireless signal receiver | |
| CN108847866A (en) | Radio-frequency front-end monkey chatter suppression circuit and WLAN access device | |
| CN215932149U (en) | Big dipper dual antenna transceiver module | |
| US6999742B2 (en) | By-passing adjacent channel interference removal in receivers | |
| CN102571121A (en) | Short wave broadband receiver | |
| CN107769800A (en) | Communication control processor between a kind of multifrequency point Terahertz star | |
| CN106712805A (en) | Shortwave pre-post selector | |
| CN216209922U (en) | Big dipper integration radio frequency front end | |
| CN109981124B (en) | Adaptive sampling method for analog-to-digital converter for improving sensitivity attenuation of radio frequency receiver | |
| CN209593413U (en) | A kind of small-sized integrated receiver in broadband | |
| US7081862B2 (en) | Integrated active satellite antenna module | |
| CN112217535A (en) | Multi-mode radio frequency front-end integrated chip and working method | |
| CN101432974A (en) | Multiple input multiple output signal receiving apparatus with optimized performance | |
| CN219329735U (en) | Small-sized secondary frequency conversion assembly | |
| CN215268247U (en) | High-frequency receiving assembly | |
| CN212696101U (en) | Anti-interference L frequency channel MAXIER hybrid circuit board structure under 5G environment | |
| CN217546043U (en) | Ka frequency channel frequency conversion receiving and dispatching subassembly | |
| KR100277128B1 (en) | Interference Frequency Reception Signal Attenuation Device in Dual Band Wireless Communication System | |
| CN217135479U (en) | Radio frequency receiving circuit and receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |