Wireless shunting system based on diversity reception and same-frequency relay and its use method
By adopting diversity reception and co-frequency relay technology in the railway plane wireless shunting system, using multiple antennas for signal weighting and superposition, the problems of radio frequency power inconsistent and insufficient coverage are solved, the communication distance and coverage effect are improved, and the communication distance and coverage effect are reduced. Construction and cost.
Patent Information
- Application Number
- CN202110382122.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-04-09
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2041-04-09
AI Technical Summary
In the existing railway plan wireless shunting system, the RF power is inconsistent and the coverage is different, which makes it impossible to receive the communication distance between the district chief station and the handheld station. Moreover, it is difficult to select a site when the same frequency relay station is set up separately. , problems of inconvenient construction and power supply, large project volume and high cost.
Adopt a wireless shunting system based on diversity reception and co-frequency relay. Three antennas are installed outside the district chief station, and the amplifier, inverter, filter and intermediate frequency module are connected through wires to realize diversity reception and co-frequency relay of signals, and increase the The receiving antenna is used to improve the reception gain and signal weighting and superimposing is performed through the DSP module to achieve the output of the optimal reception of the synthetic signal.
The reception gain of the district chief station is increased, which is equivalent to the increase of the transmission gain of the handheld station and the machine controller by 4dB, which expands the uplink distance, reduces the construction volume and cost, improves the coverage effect, and avoids the difficulty of setting up a relay station separately.
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Figure CN113162672B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of radio communications, and in particular to a wireless shunting system based on diversity reception and co-frequency relay and a method for using the system. Background Art
[0002] As the primary link in railway operation, railway flat shunting is the shunting operation carried out on the flat lead-out line. The completion of flat shunting tasks is the first step to ensure that trains run on the corresponding tracks and that personnel and goods are accurately transported. The railway flat wireless shunting system is an information and control system for vehicle marshaling and dispatching that is based on the radio station equipped with control software and hardware, transmits vehicle marshaling and shunting information in real time, and realizes the integration of communication and signaling of light display signaling and voice prompts.
[0003] For example, the Chinese invention patent application with application number 201911171256.8 discloses a railway plane wireless shunting positioning method, including: estimating the current locomotive position based on the locomotive position at the previous moment, combining the measurement data of the locomotive position, and judging the precise position of the locomotive according to the shunting section. Based on this method, the present invention also discloses a railway plane wireless shunting system, including a section chief station controller, a locomotive station controller, a handheld radio, and a cloud server.
[0004] For another example, the Chinese utility model patent with application number 201120074145.8 discloses a wireless shunting locomotive monitoring system on-board host, which includes two functions: sending and receiving. The sending part includes a watchdog circuit electrically connected to a microprocessor, a CAN communication circuit, and a data transmission radio. The receiving part includes a motherboard, a bus interface board, a mainboard, a data transmission radio, a 485 communication circuit, and a power supply circuit.
[0005] The existing railway flat wireless shunting system uses handheld radios or walkie-talkies to achieve instant voice communication and mutual transmission of basic control instructions (such as moving, stopping, starting shunting, completing shunting, etc.) between the district chief station, locomotive station, and shunting team members through wireless communication, but it still has the following disadvantages:
[0006] 1. The RF power is inconsistent and the coverage range varies. According to the railway TB / T2834-2016 railway wireless shunting light display equipment technical standard, the maximum RF power of the machine controller and the handheld station is 4W, and the maximum power of the district chief station is 10W. When the equipment is in use, it is generally operated at full power, so the transmission power of the district chief station and the handheld station machine controller is very different, and the uplink and downlink power is unbalanced. The district chief station can basically cover the entire shunting group activity range. When the district chief station transmits, the handheld stations and machine controllers in the same frequency group can generally receive normally; while the transmission power of the machine controller and the handheld station is small, especially the handheld station, which has a much smaller communication distance than the district chief station. When the handheld station talks and sends signals, it is often impossible to receive between the handheld stations that are far apart or between the handheld stations and the machine controller.
[0007] 2. In order to expand the calling range and communication capability of machine controllers and handheld stations, some stations have separately set up same-frequency repeater stations to increase the communication distance and expand the coverage. However, there are also problems such as difficult site selection for repeater stations, inconvenient construction and power supply, large engineering workload and high price of repeater stations. Summary of the invention
[0008] In view of the shortcomings of the prior art, the present invention proposes a wireless shunting system based on diversity reception and co-frequency relay.
[0009] The wireless shunting system based on diversity reception and co-frequency relay of the present invention comprises a district chief station and several handheld stations, wherein three antennas are arranged outside the district chief station, namely a main antenna, a first auxiliary antenna and a second auxiliary antenna, and the spacing between the three antennas is more than 1.5λ, the main antenna is connected to an antenna switch, a one-way total amplifier, a one-way frequency converter, a one-way filter and a one-way intermediate frequency module in sequence through wires, the first auxiliary antenna is connected to a two-way total amplifier, a two-way frequency converter, a two-way filter and a two-way intermediate frequency module in sequence through wires, the second auxiliary antenna is connected to a three-way total amplifier, a three-way frequency converter, a three-way filter and a three-way intermediate frequency module in sequence through wires; one-way sub-amplifier It is respectively connected to the antenna switch and the primary frequency converter through wires, the two-way frequency converter is connected to the two-way branch amplifier through wires, the three-way frequency converter is connected to the three-way branch amplifier through wires, the phase-locked loop is respectively connected to the one-way branch amplifier, the two-way branch amplifier and the three-way branch amplifier through wires; the speaker, the speaker amplifier and the AD / DA converter are connected in sequence through wires, the microphone, the microphone amplifier and the AD / DA converter are connected in sequence through wires, the DSP module is respectively connected to the one-way intermediate frequency module, the two-way intermediate frequency module, the three-way intermediate frequency module, the MCU module, the phase-locked loop and the AD / DA converter through wires; the district chief station is connected to several handheld stations wirelessly.
[0010] Furthermore, the radio frequency of the district station is set between 400MHz and 450MHz, the maximum wavelength is 0.75m, and the minimum spacing between the main antenna, the first sub-antenna, and the second sub-antenna is 1.125m.
[0011] The present invention further provides a method for using the wireless shunting system based on diversity reception and co-frequency relay, and the specific steps are as follows:
[0012] Step 1: Adjust the distance between the main antenna, the first secondary antenna, and the second secondary antenna so that the distance between the main antenna, the first secondary antenna, and the second secondary antenna is greater than 1.5λ;
[0013] Step 2: Allocate communication time slots to the zone long station, with the first time slot used for receiving and the second time slot used for transmitting;
[0014] Step 3: Match the antenna switch state with the transmission of the first time slot and the reception of the second time slot;
[0015] Step 4: In the receiving state, the first signal is received by the main antenna, amplified by a total amplifier, and then mixed with the first local oscillator signal generated by the phase-locked loop by a sub-amplifier, and then mixed in a frequency converter to complete a frequency conversion and generate a first intermediate frequency signal; then the first intermediate frequency signal is filtered by a filter, loaded into an intermediate frequency module, and secondary frequency conversion, filtering, and AD conversion are performed in the intermediate frequency module, and the generated digital signal is sent to the DSP module;
[0016] Step 5: Based on step 4, the second signal received by the different propagation paths is received by the first antenna, amplified by the two-way total amplifier, and then mixed with the first local oscillator signal generated by the phase-locked loop by the two-way branch amplifier, and then mixed in the two-way frequency converter to complete the primary frequency conversion and generate the first intermediate frequency signal; then after being filtered by the two-way filter, it is loaded into the two-way intermediate frequency module, and the secondary frequency conversion, filtering, and AD conversion are performed in the two-way intermediate frequency module, and the generated digital signal is sent to the DSP module;
[0017] Step 6: Based on step 5, the third signal received by different propagation paths is received by the second antenna, amplified by the three-way total amplifier, and then mixed with the first local oscillator signal generated by the phase-locked loop by the three-way branch amplifier, and then mixed in the three-way frequency converter to complete the primary frequency conversion and generate the first intermediate frequency signal, which is then filtered by the three-way filter and loaded into the three-way intermediate frequency module, and the secondary frequency conversion, filtering, and AD conversion are performed in the three-way intermediate frequency module, and the generated digital signal is sent to the DSP module;
[0018] Step 7: When the district station is in the receiving state, the DSP module first performs digital phase shifting on the first signal, the second signal, and the third signal to obtain the first signal, the second signal, and the third signal receiving signals with the same phase, and performs weighted calculation on each signal according to the calculated signal strength, and finally superimposes the weighted signals to obtain the optimal receiving composite signal;
[0019] Step 8: The DSP module demodulates the synthesized optimal signal, outputs the audio code stream and sends it to the AD / DA converter, converts it into an analog audio signal, amplifies it with an audio amplifier, and sends it to the speaker for playback;
[0020] Step 9: The DSP module decodes the synthesized optimal signal and outputs the data stream to the MCU for processing;
[0021] Step 10: When transmitting, the microphone amplifies the collected audio signal through the amplifier, sends it to the AD / DA converter to convert it into a digital signal, and transmits it to the DSP module. The DSP module generates a modulation signal, which is then loaded into the phase-locked loop and amplified and output by a branch amplifier. When the antenna switch is set to the transmitting state, it is transmitted by the main antenna;
[0022] Step 11: The district chief station receives and determines the total received signal through diversity reception for each first time slot, and forwards the second time slot to the machine controller and the handheld station. The two time slots are performed alternately. Each time slot is short and the user cannot distinguish the voice interruptions. The district chief station has the function of a repeater station and there is no need to construct and set up a single frequency repeater station.
[0023] Furthermore, in step 7, the signal strength of each signal is calculated for the first signal, the second signal, and the third signal received with consistent phases, and a number of weighting coefficients are given according to the signal strength of each signal. Then, the weighted first signal, the second signal, and the third signal are superimposed to obtain a synthesized optimal signal.
[0024] Furthermore, in step 11, the district station also has a same-frequency relay forwarding function, receiving in the first time slot and forwarding in the second time slot. When forwarding in the second time slot, the main antenna switch is in the transmitting state.
[0025] The beneficial effects of the wireless shunting system based on diversity reception and co-frequency relay described in the present invention are as follows:
[0026] 1. Compared with the prior art, the district station of the present invention adds two auxiliary antennas for receiving. The two auxiliary antennas only participate in the diversity reception of the district station, and the district station uses the main antenna for transmission.
[0027] 2. According to actual measurement, the diversity reception of the present invention increases the receiving gain of the district station by 4dB, which is equivalent to a 4dB increase in the transmitting gain of the handheld station and the machine controller. The original 4W radio station is equivalent to obtaining a transmitting effect of about 10W, which is basically the same as the district station, and the uplink distance is significantly increased.
[0028] 3. The district chief station in the present invention adds a same-frequency relay function. As long as the district chief station can receive the uplink voice and signaling, it will be forwarded. As long as the original district chief station can cover the place, the handheld station and the machine controller can also cover it, meeting the needs of railway station shunting communication.
[0029] 4. The present invention adds two receiving antennas to the district station, and no additional power supply is required. The construction workload is greatly reduced compared to setting up a relay station alone, the cost is reduced, and the coverage effect is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 The figure is a schematic diagram of the connection relationship of the wireless shunting system based on diversity reception and co-frequency relay according to the present invention.
[0031] Figure 2 The figure is a schematic diagram of an external antenna of the wireless shunting system based on diversity reception and co-frequency relay according to the present invention.
[0032] Figure 3 The figure is a schematic diagram of the wireless connection relationship of the wireless shunting system based on diversity reception and co-frequency relay according to the present invention.
[0033] As shown in the figure: 1-main antenna; 2-first sub-antenna, 3-second sub-antenna; 4-one-way total amplifier, 5-two-way total amplifier, 6-three-way total amplifier; 7-one-way frequency converter, 8-two-way frequency converter, 9-three-way frequency converter; 10-one-way filter, 11-two-way filter, 12-three-way filter; 13-one-way branch amplifier, 14-two-way branch amplifier, 15-three-way branch amplifier; 16-one-way intermediate frequency module, 17-two-way intermediate frequency module, 18-three-way intermediate frequency module; 19-MCU module, 20-antenna switch, 21-DSP module, 22-phase-locked loop, 23-AD / DA converter, 24-microphone amplifier, 25-speaker amplifier, 26-microphone, 27-speaker, 28-district director station, 29-handheld station. DETAILED DESCRIPTION
[0034] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.
[0035] like Figures 1 to 3 As shown, the specific implementation of the communication system of the present invention is as follows:
[0036] The wireless shunting system based on diversity reception and co-frequency relay includes a district chief station 28 and several handheld stations 29, wherein a main antenna 1, a first sub-antenna 2, and a second sub-antenna 3 are arranged outside the district chief station 28, and the spacing between the main antenna 1, the first sub-antenna 2, and the second sub-antenna 3 is more than 1.5λ. The main antenna 1 is connected to an antenna switch 20, a one-way total amplifier 4, a one-way frequency converter 7, a one-way filter 10, and a one-way intermediate frequency module 16 in sequence through wires, the first sub-antenna 2 is connected to a two-way total amplifier 5, a two-way frequency converter 8, a two-way filter 11, and a two-way intermediate frequency module 17 in sequence through wires, and the second sub-antenna 3 is connected to a three-way total amplifier 6, a three-way frequency converter 9, a three-way filter 12, and a three-way intermediate frequency module 18 in sequence through wires; a one-way sub-amplifier 13 is connected to the antenna switch 20, One-way frequency converter 7 is connected through wires, two-way frequency converter 8 is connected to two-way branch amplifier 14 through wires, three-way frequency converter 9 is connected to three-way branch amplifier 15 through wires, and phase-locked loop 22 is connected to one-way branch amplifier 13, two-way branch amplifier 14, and three-way branch amplifier 15 through wires respectively; loudspeaker 27, speaker amplifier 25, AD / DA converter 23 are connected in sequence through wires, microphone 26, microphone amplifier 24, AD / DA converter 23 are connected in sequence through wires, DSP module 21 is connected to one-way intermediate frequency module 16, two-way intermediate frequency module 17, three-way intermediate frequency module 18, MCU module 19, phase-locked loop 22, and AD / DA converter 23 through wires respectively; district chief station 28 is connected to several handheld stations (including 1 machine controller) 29 through wireless means.
[0037] Furthermore, the radio frequency of the district chief station 28 is set to between 400 MHz and 450 MHz, the maximum wavelength is 0.75 m, and the minimum spacing among the main antenna 1, the first sub-antenna 2, and the second sub-antenna 3 is 1.125 m.
[0038] The present invention further provides a method for using a wireless shunting system based on diversity reception and co-frequency relaying, and the specific steps of the method are as follows:
[0039] Step 1: Adjust the distance between the main antenna 1, the first sub-antenna 2, and the second sub-antenna 3 so that the distance between the main antenna 1, the first sub-antenna 2, and the second sub-antenna 3 is greater than 1.5λ;
[0040] Step 2: Allocate communication time slots to the zone station 28, the first time slot is used for receiving, and the second time slot is used for transmitting;
[0041] Step 3: Match the state of the antenna switch 20 with the transmission of the first time slot and the reception of the second time slot;
[0042] Step 4: In the receiving state, the first signal is received by the main antenna 1, amplified by the main amplifier 4, and then mixed with the first local oscillator signal generated by the phase-locked loop 22 by the branch amplifier 13, and then mixed in the frequency converter 7 to complete the primary frequency conversion and generate the first intermediate frequency signal; then the first intermediate frequency signal is filtered by the filter 10, loaded into the intermediate frequency module 16, and the secondary frequency conversion, filtering, and AD conversion are performed in the intermediate frequency module 16, and the generated digital signal is sent to the DSP module 21;
[0043] Step 5: On the basis of step 4, the second signal received by the different propagation paths is received by the first antenna 2, amplified by the two-way total amplifier 5, and then mixed with the first local oscillator signal generated by the phase-locked loop 22 by the two-way branch amplifier 14, and then mixed in the two-way frequency converter 8 to complete the primary frequency conversion and generate the first intermediate frequency signal; then filtered by the two-way filter 11, loaded into the two-way intermediate frequency module 17, and secondary frequency conversion, filtering, and AD conversion are performed in the two-way intermediate frequency module 17, and the generated digital signal is sent to the DSP module 21;
[0044] Step 6: On the basis of step 5, the third signal received by different propagation paths is received by the second antenna 3, amplified by the three-way total amplifier 6, and then mixed with the first local oscillator signal generated by the phase-locked loop 22 by the three-way branch amplifier 15, and then mixed in the three-way frequency converter 9 to complete the primary frequency conversion and generate the first intermediate frequency signal, and then filtered by the three-way filter 12, and loaded into the three-way intermediate frequency module 18, and the secondary frequency conversion, filtering, and AD conversion are performed in the three-way intermediate frequency module 18, and the generated digital signal is sent to the DSP module 21;
[0045] Step 7: When the district head station 28 is in the receiving state, the DSP module first performs digital phase shifting on the first signal, the second signal, and the third signal to obtain the first signal, the second signal, and the third signal receiving signals with the same phase, and performs weighted calculation on each signal according to the calculated signal strength, and finally superimposes the weighted signals to obtain the optimal receiving composite signal;
[0046] Step 8: The DSP module 21 demodulates the synthesized optimal signal, outputs an audio code stream and sends it to the AD / DA converter 23, converts it into an analog audio signal, amplifies it through the audio power amplifier 25, and sends it to the speaker 27 for playback;
[0047] Step 9: The DSP module 21 decodes the synthesized optimal signal and outputs a data code stream to be processed by the MCU 19;
[0048] Step 10: When transmitting, the microphone 26 amplifies the collected audio signal through the amplifier 24, sends it to the AD / DA converter 23 to convert it into a digital signal, and transmits it to the DSP module 21. The DSP module 21 generates a modulation signal, which is then loaded onto the phase-locked loop 22, amplified and output by the one-way amplifier 13, and transmitted by the main antenna 1 when the antenna switch 20 is set to the transmitting state;
[0049] Step 11: The district chief station 28 receives each first time slot through diversity reception and determines the total received signal, and forwards the second time slot to the machine controller and the handheld station 29. The two time slots are performed alternately. Each time slot is short and the user cannot distinguish the voice interruptions. The district chief station 28 has the function of a repeater station, and there is no need to construct and set up a single frequency repeater station.
[0050] Furthermore, in step 7, the signal strength of each signal is calculated for the first signal, the second signal, and the third signal received with consistent phases, and a number of weighting coefficients are given according to the signal strength of each signal. Then, the weighted first signal, the second signal, and the third signal are superimposed to obtain a synthesized optimal signal.
[0051] Furthermore, in step 11, the district director station 28 also has a same-frequency relay forwarding function, receiving in the first time slot and forwarding in the second time slot. When forwarding in the second time slot, the main antenna switch 20 is in the transmitting state.
[0052] It should be noted that the working principle of the present invention is as follows:
[0053] The district station has diversity reception. Diversity reception refers to the specific processing performed by the receiving end on multiple signals with independent fading characteristics (carrying the same information) to reduce signal level fluctuations. Diversity has two meanings: one is distributed transmission, which enables the receiving end to obtain multiple statistically independent fading signals carrying the same information; the other is centralized processing, that is, the receiver combines (including selection and combination) multiple statistically independent fading signals received to reduce the impact of fading.
[0054] The essence of diversity technology can be considered as a multi-antenna technology involving the combination of multiple resources such as space, time, frequency, phase and coding. Depending on the resources involved, it can be divided into several categories: space diversity, time diversity, frequency diversity and polarization diversity.
[0055] In mobile communications, a slight change in space may result in a large change in field strength. When two receiving channels are used, the fading effects on them are unrelated, and the possibility of both being affected by the deep fading trough at the same time is also very small. Therefore, this concept leads to the use of two (or more) receiving antennas to independently receive the same signal and then combine the outputs. The degree of fading can be greatly reduced. This is spatial diversity. Spatial diversity is achieved by utilizing the random variation of field strength with space. The greater the spatial distance, the greater the difference in multipath propagation and the smaller the correlation of the received field strength.
[0056] The present invention adopts the technology of spatial diversity reception and anti-fading to increase the coverage of the radio station. When uplinking, the transmitting end handheld station transmits through one antenna. In addition to the original one transmitting and receiving antenna, the receiving end district station is equipped with two receiving antennas and a high-frequency module with three receiving ends and one transmitting end. The spacing between the receiving antennas should be large enough to ensure that the fading characteristics of the output signals are independent of each other. Ideally, the distance between the antennas of the district station should be guaranteed to be more than 1.5 wavelengths to ensure that the fading characteristics of the output signals of the receiving antennas are independent of each other. That is to say, when the output signal of a certain receiving antenna is very low, the output of other receiving antennas may not necessarily have a low amplitude at the same time.
[0057] The present invention is not limited to the above-mentioned embodiments. Without departing from the essential content of the present invention, any deformation, improvement and substitution that can be thought of by those skilled in the art shall fall into the protection scope of the present invention.
Claims
1. A method for using a wireless shunting system based on diversity reception and co-frequency relay, characterized in that: The specific steps are as follows: Step 1: Adjust the distance between the main antenna, the first secondary antenna, and the second secondary antenna so that the distance between the main antenna, the first secondary antenna, and the second secondary antenna is greater than 1.5λ; Step 2: Allocate communication time slots to the zone long station, with the first time slot used for receiving and the second time slot used for transmitting; Step 3: Match the antenna switch state with the transmission of the first time slot and the reception of the second time slot; Step 4: In the receiving state, the first signal is received by the main antenna, amplified by a total amplifier, and then mixed with the first local oscillator signal generated by the phase-locked loop by a sub-amplifier, and then mixed in a frequency converter to complete a frequency conversion and generate a first intermediate frequency signal; then the first intermediate frequency signal is filtered by a filter, loaded into an intermediate frequency module, and secondary frequency conversion, filtering, and AD conversion are performed in the intermediate frequency module, and the generated digital signal is sent to the DSP module; Step 5: Based on step 4, the second signal received by the different propagation paths is received by the first antenna, amplified by the two-way total amplifier, and then mixed with the first local oscillator signal generated by the phase-locked loop by the two-way branch amplifier, and then mixed in the two-way frequency converter to complete the primary frequency conversion and generate the first intermediate frequency signal; then after being filtered by the two-way filter, it is loaded into the two-way intermediate frequency module, and the secondary frequency conversion, filtering, and AD conversion are performed in the two-way intermediate frequency module, and the generated digital signal is sent to the DSP module; Step 6: Based on step 5, the third signal received by different propagation paths is received by the second antenna, amplified by the three-way total amplifier, and then mixed with the first local oscillator signal generated by the phase-locked loop by the three-way branch amplifier, and then mixed in the three-way frequency converter to complete the primary frequency conversion and generate the first intermediate frequency signal, which is then filtered by the three-way filter and loaded into the three-way intermediate frequency module, and the secondary frequency conversion, filtering, and AD conversion are performed in the three-way intermediate frequency module, and the generated digital signal is sent to the DSP module; Step 7: When the district station is in the receiving state, the DSP module first performs digital phase shifting on the first signal, the second signal, and the third signal to obtain the first signal, the second signal, and the third signal receiving signals with the same phase, and performs weighted calculation on each signal according to the calculated signal strength, and finally superimposes the weighted signals to obtain the optimal receiving composite signal; Step 8: The DSP module demodulates the synthesized optimal signal, outputs the audio code stream and sends it to the AD / DA converter, converts it into an analog audio signal, amplifies it through the audio power amplifier, and sends it to the speaker for playback; Step 9: The DSP module decodes the synthesized optimal signal and outputs the data stream to the MCU for processing; Step 10: When transmitting, the microphone amplifies the collected audio signal through the amplifier, sends it to the AD / DA converter to convert it into a digital signal, and transmits it to the DSP module. The DSP module generates a modulation signal, which is then loaded into the phase-locked loop and amplified and output by a branch amplifier. When the antenna switch is set to the transmitting state, it is transmitted by the main antenna; Step 11: The district chief station receives and determines the total received signal through diversity reception for each first time slot, and forwards the second time slot to the machine controller and the handheld station. The two time slots are performed alternately. Each time slot is short and the user cannot distinguish the voice interruptions. The district chief station has the function of a repeater station and there is no need to construct and set up a single frequency repeater station.
2. The method for using the wireless shunting system based on diversity reception and co-frequency relay according to claim 1 is characterized in that: In step 7, the signal strength of each signal is calculated for the first signal, the second signal, and the third signal received with consistent phases. According to the signal strength of each signal, a number of weighting coefficients are given, and then the weighted first signal, the second signal, and the third signal are superimposed to obtain a synthesized optimal signal.
3. The method for using the wireless shunting system based on diversity reception and same-frequency relay according to claim 1 is characterized in that: In step 11, the district station also has the same frequency relay forwarding function, receiving in the first time slot and forwarding in the second time slot. When forwarding in the second time slot, the main antenna switch is in the transmitting state.
4. A shunting system according to the method for using the wireless shunting system based on diversity reception and co-frequency relay according to claim 1, comprising a district chief station and a plurality of handheld stations, wherein: There are three antennas outside the district head station, namely the main antenna, the first sub-antenna, and the second sub-antenna. The spacing between the three antennas is more than 1.5λ. The main antenna is connected to the antenna switch, one-way total amplifier, one-way frequency converter, one-way filter, and one-way intermediate frequency module in sequence through wires. The first sub-antenna is connected to the two-way total amplifier, two-way frequency converter, two-way filter, and two-way intermediate frequency module in sequence through wires. The second sub-antenna is connected to the three-way total amplifier, three-way frequency converter, three-way filter, and three-way intermediate frequency module in sequence through wires; one sub-amplifier is connected to the antenna switch and the primary frequency converter respectively through wires. The two-way frequency converter is connected to the two-way branch amplifier through wires, the three-way frequency converter is connected to the three-way branch amplifier through wires, the phase-locked loop is connected to the one-way branch amplifier, the two-way branch amplifier, and the three-way branch amplifier through wires; the speaker, the speaker amplifier, and the AD / DA converter are connected in sequence through wires, the microphone, the microphone amplifier, and the AD / DA converter are connected in sequence through wires, the DSP module is connected to the one-way intermediate frequency module, the two-way intermediate frequency module, the three-way intermediate frequency module, the MCU module, the phase-locked loop, and the AD / DA converter through wires; the district chief's station is connected to several handheld stations wirelessly.
5. The wireless shunting system based on diversity reception and co-frequency relay according to claim 4 is characterized in that: The radio frequency of the district station is set between 400MHz and 450MHz, the maximum wavelength is 0.75m, and the minimum distance between the main antenna, the first sub-antenna, and the second sub-antenna is 1.125m.