CN112073108A - Relay device of 230MHz wireless data transmission radio station and application method - Google Patents
Relay device of 230MHz wireless data transmission radio station and application method Download PDFInfo
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Abstract
A repeater device and application method of the wireless data radio station of 230MHz, divide the apparatus body into two parts that can be opened and closed and size corresponds to from side to side, there are integrated module assemblies of up-and-down digital frequency selection, power supply module and lightning protection device with switch in the apparatus body inner space of the left half, the up-and-down digital frequency selection is integrated the module assembly and divided into the upper and lower module two parts with synchronous function; one side of the right half internal space is provided with a downlink power amplifier and an uplink power amplifier, the other side of the internal space is provided with a first duplexer and a second duplexer, and the power amplifiers are in signal communication with the duplexers; the outer side of the device shell is provided with a power supply port, a data interface and an external antenna signal interface; the invention has small volume, convenient installation, low cost, safety and reliability, can improve the coverage level and the signal quality of a 230MHz data transmission radio station network, solves the problem of unbalanced capacity among base stations, reduces the interference among the base stations and improves the utilization rate of frequency resources.
Description
Technical Field
The invention relates to the field of signal forwarding and transmission, in particular to a relay device applied to a 230MHz wireless data transmission radio station and a matched application method thereof.
Background
At present, with the requirement of comprehensively promoting the construction of three types and two networks made by the national power grid of China, the strategic deployment of world first-class energy Internet enterprises with global competitiveness is accelerated, a new path is opened up when the power Internet of things achieves the aims of safer operation, more lean management, more accurate investment, better service and the like, the unique advantages of the power grid can be fully exerted, the huge blue-sea market of digital economy is developed, and under the aim, the power load management system is used as the most important component part in the ubiquitous power Internet of things and has great potential.
The marine electricity load management system is established in 1996, is an important carrier connected with governments, industrial institutions and electricity customers, and is an important component for realizing ubiquitous connection of the electricity internet of things, the terminal access mode of the system is mainly 230MHz wireless data transmission radio stations (2400-19200 bps), a master station system 1 set, 14 remote base stations and 23 independent channels are established at present, the number of access terminals is nearly 30000 households, the number of metering devices capable of copying and collecting is nearly 40000 sets, the information collection range is wide, and the data collection amount is large.
Based on the system, the national power grid develops businesses such as temporary power limitation, power utilization information acquisition, ordered power utilization, Demand Side Management (DSM) and the like in the district scope of Shanghai city, provides basic data for brother units for deep analysis, and is one of important sources of large data of the ubiquitous power Internet of things in the future.
The unique networking mode of the 230MHz radio data transmission station system is caused based on the frequency characteristic of the 230MHz frequency band, and the characteristics can be summarized as follows: large area system, high power, wide coverage, mainly line-of-sight propagation, and elimination of interference of multipath transmission through a small signal suppression circuit. With the continuous development of urban scale in recent years, the urban scale is blocked by more and more high buildings and dense buildings, so that newly-increased coverage blind areas appear in many areas, and the communication success rate of the system is greatly influenced.
Although the above problem can be solved by constructing a new base station, the following problems are common in the construction of a new base station:
1. the problems that the site selection, the machine room condition, the frequency selection, the opening of a wired return channel and other necessary conditions are difficult to implement generally exist, so that the construction cost of a new base station is high, and the construction period is long;
2. the coverage capacity is reduced due to the high difficulty in locating, so that too many user terminals are absorbed by some old base stations in high altitude positions, which causes imbalance of channel load, and the degree of imbalance is also increased year by year, for example: the load capacity of the base stations such as jiulong, shen zhuang, lujia bay and the like is close to saturation or overflow, while the base stations such as chongnan gate, fort town and the like are in an idle state in most of the whole day, which is not only common in Shanghai but also in other big cities, and the problem of unbalanced coverage and unbalanced channel load is an urgent problem;
3. after the coverage area of the high-altitude base station is enlarged, the protection distance of the same-frequency multiplexing is increased, and the system is difficult to improve the use efficiency of precious frequency resources by the same-frequency multiplexing method, so that the further expansion of the system scale is greatly restricted, if the system can be improved by certain technologies, the load balance of each channel or the multi-point multiplexing of the same frequency is realized, the stability and the reliability of the system operation are necessarily greatly improved, and the total capacity of the system is necessarily provided with a new step.
The requirement for network coverage is much lower in foreign countries than that in domestic countries, the requirement for a relay system is not large, only the repeater of the GSM technology developed by the Swedish Allgong company is used, and the repeater is not used in a large scale in the network of a domestic operator; the 230MHz data radio system is mainly applied to private networks such as electric power, and foreign manufacturers mainly provide fm radio equipment, and do not concern the field of relay amplification, but at present, the relay method or wireless repeater equipment is adopted in China to solve the above problems, but after practical application, a number of problems are found, as follows:
1. the amplification forwarding relay method, namely directly amplifying and forwarding the received radio frequency signal or baseband signal, has the advantages of very small time delay, but has the disadvantages that a useful signal and noise cannot be separated from interference, and the noise is amplified while the signal is amplified;
2. the decoding forwarding relay method demodulates and decodes the received signal, then re-encodes, modulates and transmits the signal, has the advantages that the energy of noise and interference is completely inhibited through demodulation and decoding, and has the disadvantage that larger processing time delay is generated due to demodulation and decoding;
3. when the traditional wireless repeater is used, because the frequencies of a base station signal and a feedback interference signal are the same (both in the working frequency band range of the repeater), the wireless repeater can generate a self-excitation interference phenomenon under the condition of higher gain, the traditional radio frequency filtering method can not solve the problem in the frequency domain, the problem can be realized only by increasing the isolation between a donor antenna and a retransmission antenna or improving the performance index of the antenna, and the manufacturing cost of the whole wireless repeater system is high.
In summary, the problems of too large time delay, high technical difficulty, high cost and no popularization and use value of the 230MHz wireless data transmission station in the prior art need to be solved, so a novel relay device is urgently needed, the problems of deep coverage and blind area coverage can be solved, the size is small, the installation is convenient, the interference is small, the cost is low, and the safety and the reliability are realized.
Disclosure of Invention
In order to solve the problems, the invention provides a 230MHz wireless data transmission radio station relay device and an application method, the invention fully utilizes the advanced and mature wireless relay technology of an operator network and is innovatively applied to a 230MHz data transmission radio station network, the provided relay device has the advantages of small volume, convenience in installation, low cost, safety, reliability and the like, is an effective means for rapidly solving the deep coverage and blind area coverage of the 230MHz data transmission radio station network, can greatly improve the coverage level and signal quality of the 230MHz data transmission radio station network, solves the problem of unbalanced capacity among base stations, reduces the interference among the base stations and improves the utilization rate of frequency resources.
The invention relates to a relay device of a 230MHz wireless data transmission radio station and an application method thereof, wherein the specific structure and the application method are as follows:
a repeater device of a 230MHz wireless data transmission station, which comprises an openable device shell, and is characterized in that:
the device shell is divided into two parts which can be opened and closed left and right and have corresponding sizes, wherein an uplink and downlink digital frequency selection integrated module assembly, a power supply assembly with a switch and a lightning protection device are arranged in the inner space of the device shell of the left half part, and the uplink and downlink digital frequency selection integrated module assembly is divided into an uplink module part and a downlink module part with a synchronous function;
an uplink power amplifier and a downlink power amplifier are arranged on one side of the inner space of the right half part of the device shell, a first duplexer and a second duplexer are arranged on the other side of the inner space, and the power amplifiers are in signal communication with the duplexers;
the uplink and downlink digital frequency selection integrated module component is divided into an uplink module part and a downlink module part with a synchronization function.
The downlink power amplifier, i.e. the repeater, receives the base station signal and performs repeater amplification on the received signal and sends the signal to the terminal, and the uplink power amplifier, i.e. the repeater, receives the terminal signal and performs repeater amplification on the received signal and sends the signal to the base station.
The invention relates to a 230MHz wireless data transmission radio station relay device, which takes into account the problem that the 230MHz data transmission radio station system and the original public network communication system still have great difference in the aspects of system bandwidth, signal modulation mode, transmission rate, receiving sensitivity, anti-interference capability, duplex mode and the like during design, and the technical key points and the main points of the invention are as follows:
1. narrow band filtering technique
Because the signal bandwidth of the 230MHz data transmission radio station is 25KHz and is far lower than the signal bandwidth of a public network, higher requirements are provided for the design of a filter, the good filter design ensures that stray interference is effectively filtered, the receiving sensitivity is improved, and meanwhile, a useful signal is kept to be undistorted;
2. power amplifier fast switching technology
Because the invention adopts a demodulation forwarding relay mode, demodulation needs a certain time, so a certain time delay exists, the power amplifier needs a certain time from preheating to power stabilization, the time delay superposition of the two times can exceed the maximum time delay which can be borne by a 230MHz data transmission station system, and the transmission rate of the system is influenced, so a power amplifier rapid switching technology is needed to reduce the processing time delay of the whole system;
3. uplink automatic turn-off technology
In order to ensure that the relay equipment does not generate interference on the original base station system, when no uplink signal is transmitted, an uplink single channel needs to be closed, the interference on the base station system is reduced, the modulation mode of a 230MHz data transmission radio station is greatly different from that of the original public network system, an uplink signal detection circuit needs to be redesigned and developed, an uplink channel can be timely closed when no uplink signal exists, and a channel can be timely opened when an uplink signal exists;
4.230MHz data transmission radio station synchronization technology
The 230MHz data radio station system is in a serial half-duplex mode completely different from the full duplex mode of the original public network, and the public network can acquire synchronous information by decoding system information.
In addition, the 230MHz data transmission station communication is composed of an uplink signal and a downlink signal, and because the frequency band and direction of the uplink signal and the downlink signal are different, the required signal strength is also different, and the repeater must have the capability of processing the uplink signal and the downlink signal respectively, an uplink power amplifier and a downlink power amplifier are provided.
The repeater device of the 230MHz wireless data transmission station is characterized in that a downlink module PCB board of the uplink and downlink digital frequency selection integrated module assembly is sequentially provided with a downlink low noise amplifier, a downlink self-excitation eliminating circuit, an automatic gain control circuit, a downlink down-conversion assembly, a downlink high suppression filter, a downlink up-conversion assembly, a downlink coupler and a downlink power amplifier.
The repeater device of the 230MHz wireless data transmission station is characterized in that an uplink path low noise amplifier, an uplink self-excitation eliminating circuit, an uplink down-conversion component, an uplink high suppression filter, an uplink up-conversion component, an uplink coupler, a squelch circuit and an uplink path power amplifier are sequentially arranged on an uplink module PCB of the uplink and downlink digital frequency selection integrated module component.
The up and down self-excitation detection eliminating circuit and the automatic gain control circuit are used for realizing the self-excitation detection, elimination and gain control functions of equipment signals and ensuring the normal work of the invention.
The relay device of the 230MHz wireless data transmission station is characterized in that the left half part and the right half part of the device shell can be folded to form an integrated relay device body.
The design makes the relay device of the 230MHz wireless data transmission station of the invention convenient for carrying and assembly.
An application of a relay device of a 230MHz radio data transmission station is based on the above relay device of a 230MHz radio data transmission station, which includes:
1) communicating the device with the signal of the donor antenna and the signal of the retransmission antenna, and connecting an external power supply to a power supply component;
2) the signal downlink relay application method comprises the following steps:
in a downlink module of an uplink and downlink digital frequency-selecting integrated module assembly, a base station signal received by a donor antenna connected externally enters a first duplexer and then enters a downlink filter for filtering, then the level is adjusted to an interface level specified by the downlink module by a downlink low-noise amplifier in the downlink module, the base station signal sequentially passes through a downlink self-excitation eliminating circuit, an automatic gain control circuit, a downlink down-conversion assembly, a downlink high-suppression filter, a downlink up-conversion assembly and a downlink coupler for signal processing, finally the base station signal is amplified by a downlink power amplifier and then sent to a second duplexer, and the base station signal is transmitted by a retransmission antenna connected externally to realize relay amplification of the base station signal;
3) in step 2), a downlink low-noise amplifier completes amplification and shaping of a base station side signal passing through a donor antenna, a downlink self-excitation eliminating circuit detects self-excitation of the downlink and eliminates self-excitation through gain adjustment, an automatic gain control circuit automatically adjusts channel gain according to an input signal to enable output to meet requirements, a downlink down-conversion component completes down-conversion of a radio frequency signal to reduce signal frequency and facilitate subsequent signal processing, a downlink high-suppression filter suppresses and filters out useless signal stray components, a downlink up-conversion component completes up-conversion of the radio frequency signal to increase signal frequency and enable the signal to be transmitted according to original carrier frequency, and a downlink coupler couples the downlink channel signal to be used as automatic gain control and self-excitation eliminating circuit feedback sampling input;
4) the signal uplink relay application method comprises the following steps:
in an uplink module of the uplink and downlink digital frequency-selection integrated module assembly, a terminal signal received by an externally connected retransmission antenna enters an uplink filter for filtering after passing through a second duplexer, then the level is adjusted to an interface level specified by the uplink module by an uplink path low-noise amplifier of the uplink module, the terminal signal sequentially passes through an uplink self-excitation eliminating circuit, an uplink down-conversion assembly, an uplink high-suppression filter, an uplink up-conversion assembly, an uplink coupler and a squelch circuit for signal processing, finally the terminal signal is amplified by an uplink path power amplifier and then is sent to the first duplexer, and a donor antenna externally connected transmits the terminal signal to realize relay amplification of the terminal signal;
5) in step 4), the uplink path low noise amplifier completes amplification and shaping of a terminal side signal passing through the retransmission antenna, the uplink self-excitation eliminating circuit detects the uplink path self-excitation and eliminates the self-excitation through gain adjustment, the uplink down-conversion component completes down-conversion of a radio frequency signal, reduces the signal frequency, facilitates subsequent signal processing, the uplink high suppression filter suppresses and filters out useless signal stray components, the uplink up-conversion component completes up-conversion of the radio frequency signal, increases the signal frequency, enables the signal to be transmitted according to the original carrier frequency, and the uplink coupler: the coupled uplink channel signal is used as the feedback sampling input of the self-excitation eliminating circuit, and the squelch circuit filters excessive background noise to eliminate or restrain the background noise when the signal is not received.
The relay device of the 230MHz wireless data transmission radio station and the application method thereof of the invention have the following beneficial effects:
1. the relay device of the 230MHz wireless data transmission radio station and the application method can be applied to the existing electric power 230MHz data transmission radio station system, are arranged between a base station and an area to be covered, are used as main means for covering and extending the base station, solve the signal coverage blind area, improve the coverage rate of the existing system, and can greatly optimize the network architecture of the area and improve the success rate of system communication by verification, and the relay device is strictly synchronous with the base station;
2. the transmitting power of the relay device of the 230MHz wireless data transmission station and the application method is less than 15W, the coverage capability is equivalent to that of a base station, the requirement on the field is low, the relay device can be rapidly deployed to a plurality of areas by utilizing non-electric power owned properties (such as iron towers, original terminal users and the like), the coverage problem of a blind area is solved, the problem of the coverage of the blind area formed by high-rise blocking in an urban area can be solved, the stray interference is effectively filtered, the receiving sensitivity is improved, the complete separation of the interference and signals can be realized, and the interference to the original base station system is not generated;
3. compared with a construction scheme for constructing a new base station, the relay device of the 230MHz wireless data transmission station and the application method have the characteristics of low cost, quick deployment, strong system adaptability, capability of ensuring the balance of the uplink and the downlink of the system, good compromise effect on performance and time delay and the like, and have good social and economic benefits.
Drawings
Fig. 1 is a schematic diagram of a detailed structure of a relay device of a 230MHz radio and an apparatus part of an application method according to the present invention;
fig. 2 is a schematic structural diagram of a relay device of a 230MHz wireless data transmission station and a device housing of an application method of the invention after being folded;
fig. 3 is a schematic diagram illustrating an application effect of a relay device and an application method of a 230MHz radio data transmission station according to the present invention.
In the figure: 1-device housing, 2-uplink and downlink digital frequency selection integrated module assembly, 3-power supply assembly, 4-lightning protection device, 5-downlink power amplifier, 6-uplink power amplifier, 7 a-first duplexer, 7 b-second duplexer, 8-donor antenna, 9-retransmission antenna, 10-downlink filter, 11-uplink filter, 21-downlink low noise amplifier, 22-downlink self-excitation eliminating circuit, 23-automatic gain control circuit, 24-downlink down-conversion assembly, 25-downlink high suppression filter, 26-downlink up-conversion assembly, 27-downlink coupler, 2 a-uplink low noise amplifier, 2 b-uplink self-excitation eliminating circuit, 2 c-down conversion component for uplink, 2 d-high suppression filter for uplink, 2 e-up conversion component for uplink, 2 f-coupler for uplink and 2 g-squelch circuit.
Detailed Description
The following describes a relay device and an application method of a 230MHz radio data transmission station according to the present invention with reference to the accompanying drawings and embodiments.
Examples
As shown in fig. 1 to fig. 3, a relay device of a 230MHz radio data transmission station comprises a device housing 1 which can be opened and closed, and the device housing is divided into two parts which can be opened and closed left and right and have corresponding sizes, wherein an internal space of the device housing of the left half part is provided with an uplink and downlink digital frequency selection integrated module component 2, a power supply component 3 with a switch and a lightning protection device 4, and the uplink and downlink digital frequency selection integrated module component is divided into an uplink module part and a downlink module part with a synchronization function;
an uplink power amplifier 5 and a downlink power amplifier 6 are arranged on one side of the inner space of the right half part of the device shell 1, a first duplexer 7a and a second duplexer 7b are arranged on the other side of the inner space, and the power amplifiers are in signal communication with the duplexers;
the outer side of the device shell 1 is provided with a power supply port, a data interface and an external antenna signal interface;
a downlink module PCB of the uplink and downlink digital frequency-selective integrated module assembly 2 is sequentially provided with a downlink low noise amplifier 21, a downlink self-excitation cancellation circuit 22, an automatic gain control circuit 23, a downlink down-conversion assembly 24, a downlink high suppression filter 25, a downlink up-conversion assembly 26, and a downlink coupler 27, and input signals sequentially pass through the above-described devices.
An uplink access low noise amplifier 2a, an uplink self-excitation eliminating circuit 2b, an uplink down-conversion module 2c, an uplink high suppression filter 2d, an uplink up-conversion module 2e, an uplink coupler 2f and a squelch circuit 2g are sequentially arranged on an uplink module PCB of the uplink and downlink digital frequency selection integrated module assembly 2, and input signals sequentially pass through the devices.
The left and right halves of the device housing 1 can be folded together to form an integrated relay device body.
As shown in fig. 3, an application of a relay device of a 230MHz radio data transmission station is based on the above relay device of a 230MHz radio data transmission station, which includes the following specific steps:
1) the device is in signal communication with a donor antenna 8 and a retransmission antenna 9, and an external power supply is connected with a power supply component 3;
2) the signal downlink relay application method comprises the following steps:
in a downlink module of the uplink and downlink digital frequency-selecting integrated module component 2, a base station signal received by a donor antenna 8 connected externally enters a first duplexer 7a and then enters a downlink filter 10 for filtering, then the level is adjusted to an interface level specified by the downlink module by a downlink low noise amplifier 21 in the downlink module, the base station signal sequentially passes through a downlink self-excitation eliminating circuit 22, an automatic gain control circuit 23, a downlink down-conversion component 24, a downlink high suppression filter 25, a downlink up-conversion component 26 and a downlink coupler 27 for signal processing, finally the base station signal is amplified by a downlink power amplifier 5 and then sent to a second duplexer 7b, and is transmitted by a retransmission antenna 9 connected externally to realize relay amplification of the base station signal;
3) in step 2), a downlink low-noise amplifier completes amplification and shaping of a base station side signal passing through a donor antenna, a downlink self-excitation eliminating circuit detects self-excitation of the downlink and eliminates self-excitation through gain adjustment, an automatic gain control circuit automatically adjusts channel gain according to an input signal to enable output to meet requirements, a downlink down-conversion component completes down-conversion of a radio frequency signal to reduce signal frequency and facilitate subsequent signal processing, a downlink high-suppression filter suppresses and filters out useless signal stray components, a downlink up-conversion component completes up-conversion of the radio frequency signal to increase signal frequency and enable the signal to be transmitted according to original carrier frequency, and a downlink coupler couples the downlink channel signal to be used as automatic gain control and self-excitation eliminating circuit feedback sampling input;
4) the signal uplink relay application method comprises the following steps:
in an uplink module of the uplink and downlink digital frequency-selective integrated module component 2, a terminal signal received by an externally connected retransmission antenna 9 enters a second duplexer 7b and then enters an uplink filter 11 for filtering, then the level is adjusted to an interface level specified by the uplink module by an uplink path low noise amplifier 2a of the uplink module, the terminal signal sequentially passes through an uplink self-excitation eliminating circuit 2b, an uplink down-conversion component 2c, an uplink high suppression filter 2d, an uplink up-conversion component 2e, an uplink coupler 2f and a squelch circuit 2g for signal processing, finally the terminal signal is amplified by an uplink path power amplifier 6 and then is sent to the first duplexer 7a, and the terminal signal is transmitted by an externally connected donor antenna 8 to realize relay amplification of the terminal signal;
5) in step 4), the uplink path low noise amplifier completes amplification and shaping of a terminal side signal passing through the retransmission antenna, the uplink self-excitation eliminating circuit detects the uplink path self-excitation and eliminates the self-excitation through gain adjustment, the uplink down-conversion component completes down-conversion of a radio frequency signal, reduces the signal frequency, facilitates subsequent signal processing, the uplink high suppression filter suppresses and filters out useless signal stray components, the uplink up-conversion component completes up-conversion of the radio frequency signal, increases the signal frequency, enables the signal to be transmitted according to the original carrier frequency, and the uplink coupler: the coupled uplink channel signal is used as the feedback sampling input of the self-excitation eliminating circuit, and the squelch circuit filters excessive background noise to eliminate or restrain the background noise when the signal is not received.
The relay device of the 230MHz wireless data transmission radio station and the application method can be applied to the existing electric power 230MHz data transmission radio station system, are arranged between a base station and an area to be covered, are used as main means for covering and extending the base station, solve the signal coverage blind area, improve the coverage rate of the existing system, and can greatly optimize the network architecture of the area and improve the success rate of system communication by verification, and the relay device is strictly synchronous with the base station; the transmitting power of the invention is less than 15W, the covering capability is equivalent to that of a base station, the requirement on the field is low, the non-electric power owned property (such as an iron tower, an original terminal user and the like) can be rapidly deployed to a plurality of areas, the covering problem of blind areas is solved, the problem of blind area covering caused by high-rise blocking in urban areas can also be solved, the stray interference is effectively filtered, the receiving sensitivity is improved, the complete separation of the interference and signals can be realized, and the interference to the original base station system is not generated; compared with a construction scheme for constructing a new base station, the method has the characteristics of low cost, quick deployment, strong system adaptability, capability of ensuring the balance of the uplink and the downlink of the system, good compromise effect on performance and time delay and the like, and has good social and economic benefits.
The relay device of the 230MHz wireless data transmission radio station and the application method are suitable for the field of signal relay transmission of the 230MHz wireless data transmission radio station.
Claims (5)
1. A repeater device for a 230MHz radio data transmission station, comprising a device housing (1) which can be opened and closed, characterized in that:
the device shell (1) is divided into two parts which can be opened and closed left and right and have corresponding sizes, wherein an uplink and downlink digital frequency selection integrated module component (2), a power supply component (3) with a switch and a lightning protection device (4) are arranged in the inner space of the device shell of the left half part, and the uplink and downlink digital frequency selection integrated module component is divided into an uplink module part and a downlink module part with a synchronization function;
a downlink power amplifier (5) and an uplink power amplifier (6) are arranged on one side of the inner space of the right half part of the device shell (1), a first duplexer (7a) and a second duplexer (7b) are arranged on the other side of the inner space, and the power amplifiers are in signal communication with the duplexers;
the device is characterized in that a power supply port, a data interface and an external antenna signal interface are arranged on the outer side of the device shell (1).
2. The repeater of 230MHz wireless digital radio station as claimed in claim 1, wherein said downstream module PCB board of the upstream and downstream digital frequency-selecting integrated module assembly (2) is sequentially provided with a downstream low noise amplifier (21), a downstream self-excited cancellation circuit (22), an automatic gain control circuit (23), a downstream down-conversion assembly (24), a downstream high rejection filter (25), a downstream up-conversion assembly (26) and a downstream coupler (27), and the input signal passes through said units sequentially.
3. The repeater of 230MHz wireless digital radio station as claimed in claim 1, wherein said up going module PCB of up going and down going digital frequency-selecting integrated module assembly (2) is sequentially provided with up going path low noise amplifier (2a), up going self-excitation eliminating circuit (2b), up going down frequency converting assembly (2c), up going high suppression filter (2d), up going up frequency converting assembly (2e), up going coupler (2f) and squelch circuit (2g), and the input signal passes through said device sequentially.
4. The repeater of 230MHz radio data transmission station as claimed in claim 1, wherein the left and right half of the device housing (1) can be folded to form an integrated repeater body.
5. The application of a relay device of a 230MHz radio data transmission station, based on any of the above claims, is a relay device of a 230MHz radio data transmission station, which is specifically as follows:
1) the device is in signal communication with a donor antenna (8) and a retransmission antenna (9), and an external power supply is connected with a power supply component (3);
2) the signal downlink relay application method comprises the following steps:
in a downlink module of an uplink and downlink digital frequency selection integrated module component (2), a base station signal received by a donor antenna (8) connected externally is sent to a first duplexer (7a) and then enters a downlink filter (10) for filtering, then, the level is adjusted to the interface level specified by the downlink module by a downlink path low noise amplifier (21) in the downlink module, the base station signal is sequentially processed by a downlink self-excitation eliminating circuit (22), an automatic gain control circuit (23), a downlink down-conversion component (24), a downlink high suppression filter (25), a downlink up-conversion component (26) and a downlink coupler (27), and finally the base station signal is amplified by a downlink path power amplifier (5) and then sent to a second duplexer (7b) and transmitted by a retransmission antenna (9) connected externally, so that the relay amplification of the base station signal is realized;
3) in step 2), a downlink low-noise amplifier completes amplification and shaping of a base station side signal passing through a donor antenna, a downlink self-excitation eliminating circuit detects self-excitation of the downlink and eliminates self-excitation through gain adjustment, an automatic gain control circuit automatically adjusts channel gain according to an input signal to enable output to meet requirements, a downlink down-conversion component completes down-conversion of a radio frequency signal to reduce signal frequency and facilitate subsequent signal processing, a downlink high-suppression filter suppresses and filters out useless signal stray components, a downlink up-conversion component completes up-conversion of the radio frequency signal to increase signal frequency and enable the signal to be transmitted according to original carrier frequency, and a downlink coupler couples the downlink channel signal to be used as automatic gain control and self-excitation eliminating circuit feedback sampling input;
4) the signal uplink relay application method comprises the following steps:
in an uplink module of an uplink and downlink digital frequency selection integrated module component (2), a terminal signal received by an externally connected retransmission antenna (9) is sent to a second duplexer (7b) and then enters an uplink filter (11) for filtering, then an uplink channel low noise amplifier (2a) of the uplink module adjusts the level to an interface level specified by the uplink module, the terminal signal sequentially passes through an uplink self-excitation eliminating circuit (2b), an uplink down-conversion component (2c), an uplink high suppression filter (2d), an uplink up-conversion component (2e), an uplink coupler (2f) and a squelch circuit (2g) for signal processing, finally the terminal signal is amplified by an uplink channel power amplifier (6) and then sent to a first duplexer (7a) and transmitted by an externally connected donor antenna (8), realizing relay amplification of terminal signals;
5) in step 4), the uplink path low noise amplifier completes amplification and shaping of a terminal side signal passing through the retransmission antenna, the uplink self-excitation eliminating circuit detects the uplink path self-excitation and eliminates the self-excitation through gain adjustment, the uplink down-conversion component completes down-conversion of a radio frequency signal, reduces the signal frequency, facilitates subsequent signal processing, the uplink high suppression filter suppresses and filters out useless signal stray components, the uplink up-conversion component completes up-conversion of the radio frequency signal, increases the signal frequency, enables the signal to be transmitted according to the original carrier frequency, and the uplink coupler: the coupled uplink channel signal is used as the feedback sampling input of the self-excitation eliminating circuit, and the squelch circuit filters excessive background noise to eliminate or restrain the background noise when the signal is not received.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010797442.9A CN112073108A (en) | 2020-08-10 | 2020-08-10 | Relay device of 230MHz wireless data transmission radio station and application method |
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