CN115333607A - Split type ground system of data chain system and application method thereof - Google Patents
Split type ground system of data chain system and application method thereof Download PDFInfo
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Abstract
The invention discloses a split type ground system of a data chain system and an application method thereof, wherein the split type ground system comprises the following steps: the integrated ground device is arranged on the iron tower or the lifting rod; the baseband processing device is arranged on the ground; the integrated ground device and the baseband processing device are in communication connection through a wire-through. The invention provides a split ground system of a data chain system and an application method thereof, which separates ground equipment of the data chain system into a baseband processing device and an integrated ground device which are arranged on the ground, controls the volume and the quality of the ground system, further adopts a universal serial bus to realize the electric energy and signal transmission of the baseband processing device and the integrated ground device, and effectively realizes the uplink and downlink transmission of the data chain system, so the split ground system can be matched with a lifting rod and an iron tower, and the effective communication of the equipment of the system and the working stability of each part are ensured.
Description
Technical Field
The invention relates to the field of wireless communication and data link systems. More particularly, the present invention relates to a split-type terrestrial system of a data link system and a method of using the same.
Background
The ground equipment of the data chain system is generally packaged by integrally processing a baseband, a power amplifier and an antenna part and is used for carrying out data communication with aerial equipment, but in an actual application scene, if the communication distance between the ground equipment and the aerial equipment exceeds the range of a direct viewing distance, the ground equipment needs to be erected very high in order to overcome the problem of earth curvature, and under the condition that an iron tower cannot be erected, a lifting rod is adopted to be lifted in a common way, but the carrying capacity of the lifting rod is limited, the volume and the space are insufficient, so that the service life and the communication of the ground equipment can be influenced under the long-term use or severe environment.
Further, the existing data link products are all on-site temporary products generally, and are built at any place according to needs, and the data link products cannot be commonly built like a base station such as a mobile communication base station, so that power supply can not be provided by alternating current all the time, only a temporary power taking mode is adopted, or a generator or a portable power source (small power), and the like, but the power supply amount of the power supply is limited, meanwhile, ground equipment is large in power amplification and high in power consumption, so that the power supply time cannot be guaranteed in practical application, and long-time power supply is caused to be the disadvantage of the ground equipment.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages and in accordance with the purpose of the invention, a split-type terrestrial system of a data link system is provided, comprising:
the integrated ground device is arranged on the iron tower or the lifting rod;
the baseband processing device is arranged on the ground;
the integrated ground device and the baseband processing device are in communication connection through a wire-through.
Preferably, the integrated floor device is configured to include:
the multiplexer is connected with the baseband processing device;
an antenna module communicatively coupled to an external aerial device;
the filtering module is arranged between the antenna module and the voltage reduction module;
and a matched power amplifier module is arranged between the filtering module and the multifunctional device when uplink communication is carried out.
Preferably, the antenna module is configured to adopt a 4-element panel antenna;
the filtering module is configured to employ a cavity filter;
the filtering module is configured to employ a cavity filter;
the multiplexer is configured to include: the device comprises a detection module, an amplification module and a voltage reduction module;
wherein the voltage reduction module is configured to adopt a voltage reduction circuit for converting the 42V voltage into a 28V voltage which can be used by the power amplifier module.
Preferably, the step-down circuit is configured to include a step-down DC-DC conversion chip;
a power input Vin pin of the step-down DC-DC conversion chip is configured to be connected with the baseband processing device side;
a switch output SW pin of the step-down DC-DC conversion chip is configured to be connected with the power amplifier module through a matched inductor;
and an output voltage feedback FB pin of the step-down DC-DC conversion chip is connected with the output side of the inductor through a matched resistance-capacitance filter circuit.
Preferably, the wire harness is configured to include: a feeder cable for supplying power and a feeder cable for transmitting signals.
A method for applying the split type ground system, the baseband processing unit transmits the working voltage to the integrated ground device through the feeder cable, the voltage reduction module converts the received voltage into the voltage matched with power amplifier module, and then make every module of the integrated ground device in the working state;
the ground signal is coded and framed through a baseband processing device, the signal is sent to an integrated ground device through a feeder cable, the integrated ground device amplifies and filters the signal and then sends the signal to the air through an antenna module, and decoding processing is carried out by air equipment to recover an uplink of an uplink signal construction data chain system;
the aerial device encodes and frames the downlink signal, the antenna module receives the downlink signal sent by the aerial device based on spatial radiation, and after filtering processing, the voltage reduction module outputs the downlink signal to the baseband processing device through the feeder cable for decoding processing so as to recover the downlink signal to construct a downlink of the data chain system.
Preferably, before or after the uplink, the downlink of the data chain system is constructed, the method further comprises: the receiver sensitivity test is performed for the airborne equipment in the uplink and/or the split terrestrial system in the downlink.
Preferably, when the receiving sensitivity of the aerial device in the uplink is tested, the aerial device is used as a receiver, and the split type ground system is used as a signal input device;
when the receiving sensitivity of a split type ground system in a downlink is tested, the split type ground system is used as a receiver, and an aerial device is used as a signal input device;
a matched power divider is arranged between the signal input equipment and the receiver, and the power divider is also connected with a frequency spectrograph for testing;
a first fixed attenuator is arranged between the power divider and the receiver, and the power divider is matched with the signal input equipment;
the receiver, the frequency spectrograph, the power divider, the signal input device, the first fixed attenuator, the adjustable attenuator and the second fixed attenuator are connected through a plurality of matched radio frequency cables respectively to obtain a corresponding test environment.
Preferably, when the receiver sensitivity unidirectional test is performed on the air equipment in the uplink or the split type ground system in the downlink, the test procedure is configured to include:
firstly, determining the loss of each accessory in a test environment;
setting the emission attenuation of the split type ground system and the aerial equipment through the upper computer, and measuring the emission power of the signal input equipment through the frequency spectrograph;
step three, obtaining a power initial value Pc sent to a radio frequency port of a receiver by signal input equipment in a measuring or calculating mode;
connecting all accessories in the test environment, and calculating the receiving sensitivity of the receiver by adjusting the adjustable attenuator;
in the second step, when the receiving sensitivity of the split type ground system is tested, the transmitting attenuation of the air equipment is set to 4dB by default, and when the receiving sensitivity of the air equipment is tested, the transmitting attenuation of the split type ground system is set to 17dB by default;
in step four, the receive sensitivity Kf = power initial value Pc — attenuation end value of the adjustable attenuator.
Preferably, when the receiving sensitivity bidirectional test is performed on the air device in the uplink and the split type ground system in the downlink, the upper computer of the ground device needs to be further set with an attenuation value, where the attenuation value = the transmission power of the high-power transmitting device — the transmission power of the low-power transmitting device + the default transmission attenuation value of the split type ground system.
The invention at least comprises the following beneficial effects: the invention provides a separation design of a data chain system, which separates ground equipment of the data chain system into a baseband processing device and an integrated ground device which are arranged on the ground, controls the volume and the quality of the data chain system, further adopts a wire-through to realize the electric energy and signal transmission of the baseband processing device and the integrated ground device, and effectively realizes the uplink and downlink transmission of the data chain system, so that the data chain system can be matched with a lifting rod and an iron tower, and the effective communication of each equipment of the system and the working stability of each component are ensured.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a block diagram of a split type land system of the present invention;
FIG. 2 is a block diagram of the integrated floor unit of the present invention;
FIG. 3 is a schematic diagram of the voltage step-down circuit according to the present invention;
FIG. 4 is a diagram illustrating uplink communications according to the present invention;
FIG. 5 is a schematic diagram of the communication of the downlink of the present invention;
FIG. 6 is a schematic connection diagram of the test system of the present invention during the one-way test of the receiving sensitivity;
FIG. 7 is a schematic connection diagram of the test system of the present invention during transmit power measurement;
FIG. 8 is a schematic connection diagram of a test system of the present invention in testing the reception sensitivity of an aerial device;
FIG. 9 is a schematic connection diagram of the test system of the present invention in testing the reception sensitivity of the surface equipment;
fig. 10 is a connection diagram of the test system of the present invention when performing a bidirectional test of the reception sensitivity.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements.
As shown in fig. 1, the present invention provides a split type ground system of a data link system, including: the integrated ground device 2 and the baseband processing device 3 are connected through the integrated cable 1 module, and in the scheme, the integrated ground device is separated, so that the baseband processing part of original ground equipment is reduced, the weight of the original ground equipment is reduced (the weight is reduced by 1 kg), partial space is saved (the volume space is saved by 20 percent), and the problem of limited volume space is solved; further through the design of a traditional thread binding putting for its length can rise according to the lifter and need design, has realized realizing the transmission of signal and electric energy simultaneously between integration ground device and the baseband processing apparatus, and the power supply is provided by ground baseband processing apparatus, the effectual problem of solving long-time power supply.
Furthermore, for the integrated ground device, a modular design is adopted, so that the development efficiency is improved, the maintenance difficulty is reduced, and the mass production is facilitated, for example, as shown in fig. 2, the integrated ground device mainly comprises 4 antenna modules 4, a filtering module 5, a power amplifier module 6 and a multiplexer 7, wherein the antenna modules are configured to adopt 4-array element flat antennas with high gain, the gain can reach 10dB, the margin of a transmission link is increased, and other multi-array element flat antennas can be adopted to provide larger antenna gain;
the filtering module is configured to adopt a cavity filter design, select a Chebyshev low-pass prototype, determine an electromagnetic coupling topological structure with a transmission zero point at an infinite position, install four coaxial resonators in the filtering module, and perform energy conversion transmission of an electric field and a magnetic field in a metal cavity by using tuning and oscillation of the coaxial resonators to realize a filtering function of electromagnetic waves at corresponding frequencies, wherein the out-of-band rejection can reach 90dB, and influence on other frequency band signals is reduced;
the power amplifier module adopts 28V power supply, and the output power can reach 20W;
and the multiplexer includes: the voltage reduction circuit is a voltage reduction circuit shown in figure 3 and is used for converting a voltage 42V supplied by a ground baseband processing part into a power amplifier power supply voltage 28V, so that voltage reduction (transformation) processing of a voltage input to a feeder line of the ground baseband processing device to a power amplifier working voltage 28V is effectively realized to ensure matching degree between equipment parts, and the voltage reduction circuit is configured to comprise a voltage reduction DC-DC conversion core;
the power input Vin pin of the voltage reduction DC-DC conversion chip is configured to be connected with the baseband processing device side;
a switch output SW pin of the step-down DC-DC conversion chip is configured to be connected with the power amplifier module through a matched inductor;
and an output voltage feedback FB pin of the step-down DC-DC conversion chip is connected with the output side of the inductor through a matched resistance-capacitance filter circuit. In the practical application of the step-down DC-DC conversion chip, the matching is also needed through a peripheral resistor or a capacitor to achieve a preset effect, specifically, matched capacitors C120 and C121 are arranged on a power input Vin pin and an enable pin to serve as filter capacitors of an input power 42V, and R105 and R106 connected with an EN pin realize floating starting through voltage division to be forbidden when the voltage is pulled below 1.2V; the C123 capacitor is connected with the SS/TR pin and is used for setting the rising time of the soft start output; the resistor R107 connected with the RT/CLK is used for keeping the pin at a fixed voltage when the switching frequency is set through grounding, the resistor C127, the resistor C128 and the resistor R108 connected with the COMP are used for enabling the pin to become a synchronous input if the mode change occurs above a threshold value on a pin phase-locked loop, the resistor FB is used for enabling a reverse input voltage of 0.8V to the transconductance error amplifier, and 28V power supply is achieved through serial voltage division of the resistor R109 and the resistor R110; the SW pin acts as a switch for the internal high side MOSFET power supply and converter, C122 is a start-up capacitor connected between BOOT and SW, D2 is a rectifier to achieve constant output current, and C124 and C125 are filter capacitors for the output power supply 28V.
An amplifying circuit is further designed in the multifunctional device, so that the amplification of a weak signal in remote communication is realized, the feeder loss caused by the increase of the used feeder line of the integrated device is compensated, the communication allowance of a transmission link is ensured, and the purpose of farther communication is achieved;
when the split type ground system of the data chain system is applied, the baseband processing device transmits working voltage to the integrated ground device through the feeder cable, the voltage reduction module converts the received voltage into voltage matched with the power amplifier module, and then each module of the integrated ground device is in a working state, namely, the power amplifier module of the integrated ground device supplies power, the baseband processing device is powered by an external direct-current stabilized power supply firstly, then the electric energy is transmitted to the multifunctional device module through the feeder line, and the multifunctional device module reduces the voltage of 42V to 28V and supplies power to the power amplifier.
As shown in fig. 4, the uplink of the data link system is that a ground signal is sent to an aerial device, the ground signal is encoded and framed by a ground baseband processing device, the signal is sent to an integrated ground device by a feeder, the integrated ground device amplifies and filters the signal by a power amplifier, the signal is sent to the air from a flat antenna, and the signal is decoded by the aerial device to recover the uplink signal.
As shown in fig. 5, the downlink of the data link is that the aerial device encodes and frames the downlink signal, the signal is radiated to the space through the aerial antenna and is transmitted, the signal is received by the flat antenna of the integrated ground device, and is filtered, and then the downlink signal is transmitted to the ground baseband processing device through the feed feeder by the multiplexer, and is decoded to recover the downlink signal.
In another embodiment, before or after the uplink, the downlink of the data chain system is constructed, the method further comprises: the receiver sensitivity test is performed for the airborne equipment in the uplink and/or the split terrestrial system in the downlink.
The invention has proposed the test method of the receiving sensitivity of a data link system, mainly adopt the method of the line feed test, it is to the weak signal receiving ability according to the degree of sensitivity, the input signal apparatus is replaced by aerial apparatus or ground apparatus, the receiver is replaced by ground apparatus or aerial apparatus correspondingly, use the fixed attenuator to carry on the high-power protection to aerial apparatus and ground apparatus, guarantee the signal input to frequency spectrograph, aerial apparatus, ground apparatus can not be too strong, avoid causing the damage of the apparatus and apparatus; the emitting attenuation is configured by means of software or FPGA in ground equipment, so that the output power of aerial equipment and ground equipment is equal, the value of an adjustable attenuator is adjusted to realize simultaneous testing of bidirectional receiving sensitivity, and the software configuration is adopted, namely matched software is installed on a ground equipment monitoring upper computer, the main functions are to realize a configuration function, a link state monitoring function, an online upgrading function, an error code testing function and a downlink data real-time display function, wherein the emitting attenuation of the software configuration is the configuration function in the ground equipment software function, the actual configuration is carried out on the bottom layer of a baseband AD9361 or AD9363, the configuration is realized on the upper computer, the visual configuration is convenient, the adjustment in each time is realized by burning codes again, and the device is convenient and practical.
Example 1:
unidirectional receiving sensitivity test method
When performing the one-way reception sensitivity test, it is first determined whether to test the reception sensitivity of the aerial device or the ground device. When the receiving sensitivity of the ground equipment is tested, the ground equipment is used as a receiver, and the aerial equipment is used as input signal equipment; when the receiving sensitivity of the aerial equipment is tested, the aerial equipment is used as a receiver, and the ground equipment is used as input signal equipment. The test steps are as follows:
the method comprises the following steps: and (5) determining accessories and measuring loss.
Fig. 6 is a block diagram of a unidirectional test connection, which mainly includes a receiver 8 and a cooperating signal input device 9, and further includes:
a matched power divider 10 is arranged between the signal input equipment and the receiver, and the power divider is also connected with a frequency spectrograph 11 for testing;
the power divider and the signal input equipment are provided with matched adjustable attenuators 12, and the adjustable attenuators are provided with a first adjusting knob with 10-time stepping and a second adjusting knob with 1-time stepping;
a first fixed attenuator G1 is arranged between the power divider and the receiver, and a second fixed attenuator G2 matched with the adjustable attenuator is arranged between the adjustable attenuator and the signal input equipment;
further determining that 6 radio frequency cables used for connecting all the components are needed, wherein the 6 radio frequency cables are respectively a radio frequency cable X1 between the power divider and the first fixed attenuator, a radio frequency cable X2 between the receiver and the first fixed attenuator, a radio frequency cable X3 between the power divider and the spectrometer, a radio frequency cable X4 between the power divider and the adjustable attenuator, a radio frequency cable X5 between the adjustable attenuator and the second fixed attenuator, and a radio frequency cable X6 between the signal input device and the second fixed attenuator, when in application, the power divider adopts two dividers, the fixed attenuator is selected according to the transmitting power of the input signal device 1 and the receiver 2, and the rated bearing power of the fixed attenuator is higher than the transmitting power.
Calibrating and testing the determined power divider, the attenuator and the radio frequency cable of the test accessory by using a vector analyzer, and recording all loss values; the initial value of the adjustable attenuator is Kc.
Step two: setting the emission attenuation of the upper computer and measuring the emission power of the input signal equipment.
As shown in fig. 6, the input signal device and the spectrometer are connected, the input signal device is powered on, the upper computer is used to set the transmission attenuation value, because forcing the transmission power of the ground device and the aerial device to be sent in saturation through software can cause waveform deformation, which can cause the FPGA of the receiver to be misjudged during capturing, resulting in communication abnormality, the set value varies according to the product, the aerial device sets the transmission attenuation to 4, the ground device sets the transmission attenuation to 17, and the spectrometer is used to measure the transmission power of the aerial device or the ground device to Pf;
step three: an initial value of the power of the signal input to the rf port of the receiver is measured or calculated.
The initial value of the power input to the rf port of the receiver can be obtained in two ways, one being a direct calculation: calculating an initial power value input to a radio frequency port of a receiver (air equipment or ground equipment), and recording the power value as P1, wherein P1= transmission power (Pf) of the input equipment-total cable loss (X1 + X2+ X4+ X5+ X6) -fixed attenuation value (G1 + G2) -power divider loss (Gf) -adjustable attenuation initial value (Kc);
another mode is through the direct survey of frequency spectrograph, will connect 2 first son of cables on the receiver radio frequency mouth and get off, gets 3 first son of cables from connecting with the frequency spectrograph simultaneously, connects the frequency spectrograph on cable 2, blocks up with a load on the cable 3.
And directly reading a power initial value Pc at the moment from the spectrometer, wherein the power value is the power initial value input to the radio frequency port of the receiver, and Pc = P1 can be easily found.
Step four: and connecting equipment and building a test environment.
1. Turning off the power of the input signal device;
2. check again to determine if the one-way receive sensitivity test connection is correct as per figure 6;
3. after the test environment is established, supplying power to the input signal equipment and the receiver, and confirming whether the default parameters of the input signal equipment take effect;
4. and opening an upper computer of the input signal equipment to check the transmission attenuation value, judging whether the transmission attenuation of the aerial equipment is 4 or not and whether the transmission attenuation of the ground equipment is 17 or not, resetting if the parameters are wrong, and immediately taking effect.
Step five: and adjusting the adjustable attenuator to calculate the receiving sensitivity of the receiver.
1. Adjusting an adjustable attenuator, wherein 10 times of stepping adjusting knobs (from 10 to 80 dB) of the adjustable attenuator and 1 time of stepping adjusting knobs (from 1 to 9) of the adjustable attenuator are adjusted for 10 times of stepping, and when the condition that the communication with an aerial unit cannot be realized is checked on a receiver upper computer, one 10 times of stepping attenuation is reduced, so that the receiver can also receive signals of input signal equipment;
2. adjusting an attenuation knob with the step of an adjustable attenuator being 1 until the receiver retrieves the out-of-step state with the input signal equipment, reducing the attenuation of 1 dB until the receiver monitors and displays the synchronization with the input signal equipment, and meanwhile, no error frame is increased;
3. recording the sum of the attenuation final value (Kf) =10 times of stepping adjusting knob value and 1 time of stepping adjusting knob value of the adjustable attenuator at the moment;
4. the receiver reception sensitivity = initial value of power (Pc) input to the receiver rf port-final value of attenuation (Kf) of the adjustable attenuator.
Example 2:
the aerial equipment receiving sensitivity test comprises the following steps:
the method comprises the following steps: and (5) determining accessories and measuring loss.
As in the air equipment reception sensitivity test chart of fig. 8, the input signal equipment is ground equipment and the receiver is air equipment. Determining that the adopted power divider adopts Thailand microwave RS2W05180-S; the fixed attenuator adopts an attenuator bearing 50W and having a nominal value of 30dB, and the model is RA30A50; the 6 adopted radio frequency cables are subjected to calibration test by using a vector analyzer, and all loss values are recorded as the following table; the attenuation value of the initial value of the adjustable attenuator is set to be 10dB.
Step two: setting the emission attenuation of the upper computer and measuring the emission power of the ground equipment.
According to fig. 7, the ground device and the spectrometer are connected, the ground device is powered on, the upper computer is used for setting the emission attenuation value, the ground device is used for setting the emission attenuation value to 17, and the spectrometer is used for measuring the emission power of the ground device to Pf =43dBm;
step three: the initial value of the power at which the signal is input to the over-the-air device radio frequency port is measured or calculated.
The initial value of the power input to the radio frequency port of the air device can be obtained in two ways, one is a direct calculation: calculating a power initial value input to a radio frequency port of aerial equipment, and recording the power value as P1, then P1= transmit power (Pf) of ground equipment, total cable loss (X1 + X2+ X4+ X5+ X6), fixed attenuation value (G1 + G2), power divider loss (Gf), adjustable attenuation initial value (Kc) =43- (2 +1+ 2) - (30 + 30) -3-10= -39dBm;
another kind of mode is through the direct survey of frequency spectrograph, will connect 2 first son of cables on aerial equipment radio frequency mouth and get off, gets 3 first son of cables that connect simultaneously with the frequency spectrograph, connects the frequency spectrograph on cable 2, blocks up with a load on cable 3.
And directly reading out the power initial value Pc = -39dBm at the moment from the spectrometer, wherein the power value is equal to the power initial value input to the radio frequency port of the air equipment.
Step four: and connecting equipment and building a test environment.
1. Turning off the power supply of the ground equipment;
2. check again to determine if the over-the-air device receive sensitivity test connection is correct as in fig. 8;
3. after the test environment is established, supplying power to the ground equipment and the aerial equipment, and determining whether default parameters (emission attenuation) of the ground equipment are effective or not;
4. and opening an upper computer of the ground equipment to check whether the transmission attenuation value is 17 or not, resetting if the transmission attenuation value is wrong, and immediately taking effect.
Step five: and adjusting the adjustable attenuator and calculating the receiving sensitivity of the receiver.
1. Adjusting an adjustable attenuator, wherein a 10-time stepping adjusting knob (from 10 to 80 dB) of the adjustable attenuator and an attenuation knob (from 1 to 9) of a 1-time stepping adjusting knob (from 1 to 9) of the adjustable attenuator adjust 10-time stepping of the adjustable attenuator, and when communication with ground equipment cannot be realized on an air equipment upper computer, the 10-time stepping attenuation is reduced, so that the air equipment can also receive signals of the ground equipment;
2. adjusting an attenuation knob with the step of an adjustable attenuator being 1 until the air equipment retrieves the out-of-step state with the ground equipment, reducing the attenuation of 1 dB until the air equipment monitors and displays and is synchronous with the ground equipment, and meanwhile, no error frame is increased;
3. recording the sum of the attenuation final value (Kf) =10 times of stepping adjusting knob value and 1 time of stepping adjusting knob value =70+6=76 of the adjustable attenuator at the moment;
4. and calculating the receiving sensitivity of the aerial equipment = power initial value Pc-attenuation final value (Kf) = -39-76= -115dBm of the adjustable attenuator.
Example 3:
the ground equipment receiving sensitivity test comprises the following steps:
the method comprises the following steps: and (5) determining accessories and measuring loss.
The ground equipment receiving sensitivity test chart of fig. 9, the air equipment is used as the input signal equipment, and the ground equipment is used as the receiver. Determining that the adopted power divider adopts Thailand microwave RS2W05180-S; the fixed attenuator adopts an attenuator bearing 50W and having a nominal value of 30dB, and the model is RA30A50; the 6 adopted radio frequency cables are calibrated and tested by using a vector analyzer, and all loss values are recorded as the following table; the attenuation value of the initial value of the adjustable attenuator is set to be 10dB.
Step two: and setting the emission attenuation of the upper computer and measuring the emission power of the aerial equipment.
According to the figure 6, the aerial equipment and the spectrometer are connected, the aerial equipment is powered on, the upper computer is used for setting the emission attenuation value, the aerial equipment is used for setting the emission attenuation to be 4, and the spectrometer is used for measuring the emission power of the aerial equipment to be Pf =33dBm;
step three: and measuring or calculating the initial power value of the signal input to the ground equipment radio frequency port.
The initial value of the power input to the rf port of the surface device can be obtained in two ways, one being a direct calculation: calculating a power initial value input to a ground equipment radio frequency port, and recording the power value as P1, wherein P1= transmitting power (Pf) of air equipment, total cable loss (X1 + X2+ X4+ X5+ X6), fixed attenuation value (G1 + G2), power divider loss (Gf) -adjustable attenuation initial value (Kc) =33- (2 +1+ 2) - (30 + 30) -3-10= -49dBm;
another kind of mode passes through the direct survey of frequency spectrograph, will connect 2 overhead sons of cable on the ground equipment radio frequency mouth to get off, gets 3 overhead sons of cable from the connection with the frequency spectrograph simultaneously, connects 2 overhead sons of cable with the frequency spectrograph, blocks up with a load on the cable 3.
And directly reading a power initial value Pc = -49dBm at the moment from the spectrometer, wherein the power value is equal to the power initial value input to the radio frequency port of the ground equipment.
Step four: and connecting equipment and building a test environment.
1. Turning off the power supply of the aerial equipment;
2. checking again to determine if the ground equipment reception sensitivity test connection is correct according to fig. 9;
3. after the test environment is established, supplying power to ground equipment and aerial equipment, and determining whether default parameters (emission attenuation) of the aerial equipment are effective or not;
4. and opening an upper computer of the aerial equipment to check whether the transmission attenuation value is 4 or not, resetting if the transmission attenuation value is wrong, and immediately taking effect.
Step five: and adjusting the adjustable attenuator to calculate the receiving sensitivity of the receiver.
1. Adjusting an adjustable attenuator, wherein a 10-time stepping adjusting knob (from 10 to 80 dB) of the adjustable attenuator and an attenuation knob (from 1 to 9) of a 1-time stepping adjusting knob (from 1 to 9) of the adjustable attenuator adjust 10-time stepping of the adjustable attenuator, and when communication with aerial equipment cannot be realized on an upper computer of the ground equipment, the 10-time stepping attenuation is reduced, so that the ground equipment can also receive signals of the aerial equipment;
2. adjusting an attenuation knob with the step of an adjustable attenuator being 1 until the ground equipment retrieves the out-of-step state with the air equipment, reducing the attenuation of 1 dB until the ground equipment monitors and displays the out-of-step state and synchronizes with the air equipment, and meanwhile, no error frame is increased;
3. recording the sum of the attenuation final value (Kf) =10 times of step adjusting knob value and 1 time of step adjusting knob value =60+5=65dB at the moment;
4. and calculating the receiving sensitivity of the ground equipment = power initial value Pc-attenuation final value (Kf) = -49-65= -114dBm of the adjustable attenuator.
Example 4
And (3) simultaneously testing the bidirectional receiving sensitivity: in the receiving sensitivity test process of the embodiment 2-3, the receiving sensitivity of the unidirectional link device is tested, if the receiving sensitivity of the devices at two ends is tested at one time, the receiving sensitivity test is performed simultaneously in a wire feed mode due to the difference of the transmitting power of the aerial device and the ground device, if the transmitting power setting is not performed, the transmitting power of the aerial unit and the ground device is equivalent, so that the aerial device can be synchronized with the ground device, error-free frames are increased, and the uplink communication is normal; and the ground equipment is out of step with the aerial equipment, and downlink communication cannot be realized.
In order to ensure that the uplink receiving sensitivity (aerial equipment) and the downlink receiving sensitivity (ground equipment) can be tested at the same time, the difference between dBm of low-power transmitting equipment and the high-power transmitting equipment is subtracted to be used as an increase value of an emission attenuation value of an upper computer of the high-power equipment for setting; as can be seen from the embodiments 2 to 3, if the transmission power of the aerial device is 33dBm (2W), the transmission power of the ground device is 43dBm (20W), the transmission attenuation of the ground device is defaulted to 17, and the transmission attenuation of the ground device increases by =43-33=10, then the attenuation value needs to be set to 27 on the upper computer of the ground device.
Thus, the method for testing the receiving sensitivity in one direction can be referred to according to the connection mode shown in fig. 10, so that the testing of the receiving sensitivity of the aerial equipment and the ground equipment can be realized, and the testing of the receiving sensitivity of the one-time test bidirectional receiver (the ground equipment or the aerial equipment) can be realized by inputting the receiving sensitivity = power initial value Pc of the receiver (the ground equipment or the aerial equipment) -attenuation final value Kf of the adjustable attenuator.
The embodiment shows that the invention at least comprises the following beneficial effects:
(1) Two methods for testing the receiving sensitivity of equipment are provided: the receiving sensitivity test of the air equipment of the uplink and the receiving sensitivity test of the ground equipment of the downlink can be expanded to test the receiving sensitivity test of various equipment;
(2) Providing a high-power protection function, and realizing the protection of aerial equipment, ground equipment and a spectrometer by adopting a30 dB/50W fixed attenuator, wherein the value of the fixed attenuator can be selected according to the transmitting power of equipment at two ends;
(3) Providing a transmission attenuation software configuration function, realizing the transmission attenuation configuration of air equipment and ground equipment, and also expanding software configuration functions of receiving gain and the like;
(4) The method comprises the steps that a function of simultaneously testing the bidirectional receiving sensitivity is provided, one end with larger transmitting power is configured through software, so that the transmitting power of equipment at two ends is basically equal, and the value of an adjustable attenuator is adjusted to calculate the bidirectional receiving sensitivity of the equipment at two ends;
the above scheme is merely illustrative of a preferred example, and is not limiting. In the implementation of the invention, appropriate replacement and/or modification can be carried out according to the requirements of users.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (10)
1. A split-type surface system of a data-link system, comprising:
the integrated ground device is arranged on the iron tower or the lifting rod;
the baseband processing device is arranged on the ground;
the integrated ground device and the baseband processing device are in communication connection through a wire-line.
2. The split-floor system of data-chain system of claim 1, wherein the integrated floor device is configured to include:
the multiplexer is connected with the baseband processing device;
an antenna module communicatively coupled to an external aerial device;
the filtering module is arranged between the antenna module and the voltage reduction module;
and a matched power amplifier module is arranged between the filtering module and the multifunctional device when uplink communication is carried out.
3. The split terrestrial system of data chain system according to claim 2, wherein the antenna module is configured to employ a 4-element panel antenna;
the filtering module is configured to employ a cavity filter;
the multiplexer is configured to include: the device comprises a detection module, an amplification module and a voltage reduction module;
wherein the voltage reduction module is configured to employ a voltage reduction circuit that converts the 42V voltage into a 28V voltage usable by the power amplifier module.
4. The split terrestrial system of claim 3, wherein the voltage-reduction circuit is configured to include a voltage-reduction DC-DC conversion chip;
the power input Vin pin of the voltage reduction DC-DC conversion chip is configured to be connected with the baseband processing device side;
a switch output SW pin of the step-down DC-DC conversion chip is configured to be connected with the power amplification module through a matched inductor;
and an output voltage feedback FB pin of the step-down DC-DC conversion chip is connected with the output side of the inductor through a matched resistance-capacitance filter circuit.
5. The split-body floor system of data-chain system of claim 1, wherein the wire-line is configured to include: a feeder cable for supplying power and a feeder cable for transmitting signals.
6. A method for using the split type ground system according to any one of claims 1 to 5, wherein the baseband processing unit transmits the operating voltage to the all-in-one ground device through the feeder cable, and the voltage dropping module converts the received voltage into a voltage matched with the power amplifying module, so as to make each module of the all-in-one ground device in an operating state;
the ground signal is coded and framed through a baseband processing device, the signal is sent to an integrated ground device through a feeder cable, the integrated ground device amplifies and filters the signal and then sends the signal to the air through an antenna module, and decoding processing is carried out by air equipment so as to recover an uplink signal to construct an uplink of a data chain system;
the aerial device encodes and frames the downlink signal, the antenna module receives the downlink signal sent by the aerial device based on space radiation, and after filtering processing, the voltage reduction module outputs the downlink signal to the baseband processing device through the feeder cable for decoding processing so as to recover the downlink signal and construct a downlink of the data link system.
7. The method for applying the split terrestrial system according to claim 6, further comprising, before or after the uplink and downlink of the data link system are constructed: the reception sensitivity test is performed for the over-the-air devices in the uplink and/or for the split terrestrial systems in the downlink.
8. The method of applying the split type ground system according to claim 7, wherein in the test of the reception sensitivity of the aerial device in the uplink, the aerial device is used as a receiver, and the split type ground system is used as a signal input device;
when the receiving sensitivity of a split type ground system in a downlink is tested, the split type ground system is used as a receiver, and an aerial device is used as a signal input device;
a matched power divider is arranged between the signal input equipment and the receiver, and the power divider is also connected with a frequency spectrograph for testing;
a first fixed attenuator is arranged between the power divider and the receiver, and the power divider is matched with the signal input equipment;
the receiver, the frequency spectrograph, the power divider, the signal input device, the first fixed attenuator, the adjustable attenuator and the second fixed attenuator are connected through a plurality of matched radio frequency cables respectively to obtain a corresponding test environment.
9. The method for applying the split type terrestrial system according to claim 8, wherein when performing the one-way reception sensitivity test on the air equipment in the uplink or the split type terrestrial system in the downlink, the test procedure is configured to include:
firstly, determining the loss of each accessory in a test environment;
setting the emission attenuation of the split type ground system and the aerial equipment through the upper computer, and measuring the emission power of the signal input equipment through the frequency spectrograph;
step three, obtaining a power initial value Pc sent to a radio frequency port of a receiver by signal input equipment in a measuring or calculating mode;
connecting all accessories in the test environment, and calculating the receiving sensitivity of the receiver by adjusting the adjustable attenuator;
in the second step, when the receiving sensitivity of the split type ground system is tested, the transmitting attenuation of the air equipment is set to 4dB by default, and when the receiving sensitivity of the air equipment is tested, the transmitting attenuation of the split type ground system is set to 17dB by default;
in step four, the receive sensitivity Kf = power initial value Pc — attenuation end value of the adjustable attenuator.
10. The method for applying the split-type ground system according to claim 9, wherein when the reception sensitivity of the air device in the uplink and the split-type ground system in the downlink are tested bidirectionally, an attenuation value is further set for an upper computer of the ground device, and the attenuation value = transmission power of the high-power transmitting device-transmission power of the low-power transmitting device + transmission attenuation default setting of the split-type ground system.
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