LU101873B1 - A receiving circuit and method for atc and dme test systems - Google Patents

A receiving circuit and method for atc and dme test systems Download PDF

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Publication number
LU101873B1
LU101873B1 LU101873A LU101873A LU101873B1 LU 101873 B1 LU101873 B1 LU 101873B1 LU 101873 A LU101873 A LU 101873A LU 101873 A LU101873 A LU 101873A LU 101873 B1 LU101873 B1 LU 101873B1
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LU
Luxembourg
Prior art keywords
signal
port
switch
channel
signal receiving
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Application number
LU101873A
Other languages
German (de)
Inventor
Zhen Ye
Qi Luo
Keji Zhou
Lijun Xie
Musheng Liang
Lei Liu
Yong Cao
Hong Wen
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Univ Electronic Sci & Tech China
Chengdu Jiujin Tech Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/295—Means for transforming co-ordinates or for evaluating data, e.g. using computers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G01S7/4004—Means for monitoring or calibrating of parts of a radar system
    • G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G01S7/4052—Means for monitoring or calibrating by simulation of echoes
    • G01S7/406—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder
    • G01S7/4069—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder involving a RF signal injection
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G5/00—Traffic control systems for aircraft, e.g. air-traffic control [ATC]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/76—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
    • G01S13/78—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted discriminating between different kinds of targets, e.g. IFF-radar, i.e. identification of friend or foe
    • G01S13/781—Secondary Surveillance Radar [SSR] in general
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/76—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
    • G01S13/78—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted discriminating between different kinds of targets, e.g. IFF-radar, i.e. identification of friend or foe
    • G01S13/785—Distance Measuring Equipment [DME] systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G5/00—Traffic control systems for aircraft, e.g. air-traffic control [ATC]
    • G08G5/02—Automatic approach or landing aids, i.e. systems in which flight data of incoming planes are processed to provide landing data
    • G08G5/025—Navigation or guidance aids

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Circuits Of Receivers In General (AREA)
  • Analogue/Digital Conversion (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

The invention discloses a receiving circuit and a method for ATC and DME test systems. The circuit includes a calibration signal input interface, a digital signal processing module and a multi-channel signal receiving channel. Each signal receiving channel is connected to a signal receiving port for receiving external signals. The calibration signal input port is connected with each signal receiving channel through a gating switch and a channel selector switch. The digital signal processing module is used to compare the received signal with the input calibration signal, and generate the offset compensation table of corresponding receiving channel when a calibration signal is input into each signal receiving channel. The offset compensation table is used to calibrate the received signals in the process of signal reception of each channel. The invention based on the calibration signal can obtain the offset compensation table of each receiving channel, and calibrate the received signal during the actual signal reception. It effectively improves the accuracy of signal reception.

Description

A receiving circuit and method for ATC and DME test systems lu101873 Technical Field The invention relates to signal calibration and reception of ATC and DME test systems, in particular to a receiving circuit and method for ATC and DME test systems Technical background Air Traffic Control System (ATC) is an Air Traffic Control and management System that is widely used in the aviation sector. ATC system is mainly used to manage and control various kinds of flight affairs, effectively adjust flight affairs plan, control and prevent flight traffic accidents. The inquiry signal is sent through the ground system, airborne equipment responds to the response signal and provides air traffic controllers with the location and identity information of the aircraft in the airspace (usually in Modes A and C). As the air traffic is getting busier and busier, more and more functional requirements are required for the system. The defects of A/C mode monopulse technology can no longer meet the new requirements of aviation communication.
Distance Measure Equipment (DME), a precision distance measuring system can provide the distance information of each approaching aircraft relative to the guidance point, ensuring the approach, landing and taxiing according to the required trajectory during the automatic approach and landing. At present, the precision ranging system (DME/P) is an important component of the microwave landing system (MLS). The precision ranging airborne equipment is combined with the microwave landing airborne equipment to complete the approach landing of aircraft. In other words, when the aircraft uses the MLS system for approach landing, DME/P needs to provide precise | distance information in each stage of approach. In the DME system, the ground equipment receives | the inquiry signal sent by the airborne equipment, and replies to the airborne equipment according to the inquiry signal to complete the ranging function.
ATC system and DME system are dedicated, real-time and safe aviation heavy and large-scale systems, which require high performance of the system, so there are high requirements for the quality assurance of the system. With the sustained and rapid development of China's air transport industry, the number of aerial aircraft sorties increases, and the demand for equipment of ATC system and DME system is increasing. In addition, such airborne electronic equipment is becoming more and more sophisticated, and the testing requirements are also becoming higher and higher, the precision of receiving circuit is vital for ATC system and DME system.
Content of Invention
| | 2 The purpose of the invention is to overcome the shortcomings of the existing technology ‘4d 8/3 provide a receiving circuit and method for ATC and DME test systems, which can obtain the offset compensation table of each receiving channel based on the calibration signal, and calibrate the received signal during the actual signal reception, effectively improving the accuracy of signal reception.
The purpose of the invention is realized through the following technical schemes: a receiving circuit for ATC and DME test systems includes a calibration signal input interface, a digital signal processing module and a multi-channel signal receiving channel; Each signal receiving channel is connected to a signal receiving port for receiving external signals. The calibration signal input port is connected with each signal receiving channel respectively after passing through a gating switch and a channel selector switch.
Each of the signal receiving channels includes a switching switch, an amplitude control module and a filter control module. The first input of the switching switch is connected with the signal input port of the channel, and the second input of the switching switch is connected with the output port of | the channel selector switch. The output port of the switching switch is connected with the digital signal processing module through the amplitude control module and the filter control module in turn. | The digital signal processing module is used for comparing the received signal with the input calibration signal to generate an offset compensation table of the signal receiving channel when each | signal receiving channel inputs a calibration signal, and the offset compensation table is used to calibrate the received signal during the signal receiving process of each signal receiving channel.
The channel selection switch comprises a first single-pole double-throw switch and a load resistance. The moving port of the first single-pole double-throw switch is connected to the calibration signal input port as an input port. The first stationary port of the first single-pole double-throw switch is connected to the input port of the channel selector switch as the output port, and the second stationary port of the single-pole double-throw switch is grounded through a load resistance.
The channel selector switch is a single-pole multi-throw switch. the moving port of the single-pole multi-throw switch is used as the input port and is connected to the output port of the selector switch; The fixed port of single-pole multi-throw switch is used as the output port, and the fixed port of single-pole multi-throw switches has the same amount with the signal receiving channel and they are in a one-to-one correspondence. Each fixed port of single-pole multi-throw switch is connected to the corresponding signal receiving channel.
The switching switch comprises a second single-pole double-throw switch; The first fixed port of the second single-pole double-throw switch is connected to the signal input port of the channel as the first input port; The second fixed port of the second single-pole double-throw switch is connected to the channel selector switch as the secondary input port, and the moving port of the single-pole double-throw switch is connected to the amplitude control module as the output port. lu101873 The amplitude control module includes a third single-pole double-throw switch, a fourth single-pole double-throw switch, a preamplifier and a first amplitude controller; The moving port of the third single-pole double-throw switch is connected to the output port of the switching switch, and the moving port of the fourth single-pole double-throw switch is connected to the input port of the first amplitude controller. A preamplifier is connected between the first fixed port of the third single-pole double-throw switch and the first fixed port of the fourth single-pole double-throw switch. The second fixed port of the third single-pole double-throw switch and the second fixed port of the fourth single-pole double-throw switch are connected directly; The output port of the first amplitude controller is connected with the filter control module.
The filter control module includes a secondary controller, amplifier and filter. Input port of amplitude controller is connected to output port of secondary amplitude controller. The output port of the second amplitude controller is connected with the digital signal processing module through an amplifier and a filter in turn.
Digital signal processing module includes the FPGA module and the ADC module, ADC module includes multi-channel AD conversion unit. The AD conversion unit has the same amount with the signal receiving channel and they are in a one-to-one correspondence. The output port of each receiving channel is connected with the FPGA module through the corresponding AD conversion unit.
The FPGA module is used to compare the received signal with the input calibration signal when the calibration signal is input in each signal receiving channel, and generates the offset compensation table of the signal receiving channel. The offset compensation table is used to calibrate the received signals in the process of signal reception of each channel.
A signal receiving method for ATC and DME test systems includes a calibration step S1 and a | signal reception step S2. | The calibration step S1 includes: S101. Control the gating switch to connect te the calibration signal input port with the channel selector switch; S102. Control selector switch of channel to connect any signal receiving channels and at the same time, the switching switch of the signal receiving channel is connected with the channel selection switch.
S103. The calibration signal input from the calibration signal input port is input into signal receiving channel after passing through the gating switch, the channel selection switch and the switching switch, and after the amplitude control and filtering control are completed in the signal receiving channel, the obtained calibration signal is transmitted to the digital signal processing module.
S104. After the AD conversion of the received signal by the digital signal processing motif: 873 the offset compensation table of the current signal receiving channel is obtained from the comparison between the received signal and the signal input at the calibration port.
S105. Switch the channel selector switch to the signal receiving channel of each channel successively, and repeat steps S102~S104 during switching, obtain the offset compensation table of each signal receiving channel.
The signal receiving step S2 includes; S201. Control the gating switch and connect the signal input port to load resistance so that the calibration signal does not input into signal receiving channel, S202. Control the switching switch of each signal receiving channel to switch to the signal receiving port and receive the external input signals; S203. After each signal receiving channel performs amplitude control and filtering control on the received signal, it is transmitted to the digital signal processing module.
S204. After the AD conversion of the signal from each signal receiving channel by the digital signal processing module, the signal is calibrated based on the offset compensation table of each signal receiving channel. | The beneficial effect of the invention is: the invention can obtain the offset compensation table of each receiving channel based on the calibration signal, and calibrate the received signal during the actual signal reception, effectively improving the accuracy of signal reception.
Brief Description of the Drawings FIG. 1 is the system principle block diagram of the invention; FIG. 2 is a schematic diagram of the specific principle of the embodiment of the invention; FIG. 3 is a flow chart of the method of the invention.
Specific implementation mode The technical schemes of the invention is further described in detail in combination with the attached drawings below, but the scope of protection of the invention is not limited to the following.
As shown in figure 1, a receiving circuit for ATC and DME test systems includes a calibration signal input interface, a digital signal processing module and a multi-channel signal receiving channel. Each signal receiving channel is connected to a signal receiving port for receiving external signals. The calibration signal input port is connected with each signal receiving channel after passing through the strobe switch and the channel selection switch Each signal receiving channel includes switch control module, amplitude control module and filter, the first input port of switching switch connect to the signal input port of the channel, the
| | second input port of the switching switch is connected with the output port of the channel seleéti81878 switch, and the output of the switching switch is connected with the digital signal processing module through the amplitude control module and the filter control module in turn. | The digital signal processing module is used to compare the received signal with the input calibration signal to generate an offset compensation table of the signal receiving channel when each signal receiving channel inputs a calibration signal. The offset compensation table is used to calibrate the received signals in the process of signal reception in each signal receiving channel. | As shown in figure 2, the specific principle diagrams of signal receiving channel, strobe switch and channel selection switch are given. In the specific embodiment, the gating switch includes the first single-pole double-throw switch and the load resistance. The moving port of the first single-pole | double-throw switch is connected to the calibration signal input port as the input port. The first stationary port of the first single-pole double-throw switch is connected to the input port of the channel selector switch as the output port, and the second stationary port of the single-pole double-throw switch is grounded after a load resistance. When the single-pole double-throw switch | switches to connect load resistance, no calibration signal is input.
The channel selector switch is a single-pole multi-throw switch. The moving port of the single-pole multi-throw switch is used as the input port and is connected to the output port of the gating switch. The fixed port of single-pole multi-throw switch is used as the output port, and the fixed port of single-pole multi-throw switch has the same amount with the signal receiving channel and they are in a one-to-one correspondence. Each fixed port of single-pole multi-throw switch is connected to the corresponding signal receiving channel.
The toggle switch comprises a second single-pole double-throw switch. The first fixed port of the second single-pole double-throw switch is connected to the signal input port of the channel as the first input port; The second fixed port of the second single-pole double-throw switch is connected to the channel selector switch as the second input port, and the moving port of the single-pole double-throw switch is connected to the amplitude control module as the output port.
The amplitude control module includes a third single-pole double-throw switch, a fourth single-pole double-throw switch, a preamplifier and a first amplitude controller. The moving port of the third single-pole double-throw switch is connected to the output port of the toggle switch, and the moving port of the fourth single-pole double-throw switch is connected to the input port of the first amplitude controller. A preamplifier is connected between the first fixed port of the third single-pole double-throw switch and the first fixed port of the fourth single-pole double-throw switch. The
| | second fixed port of the third single-pole double-throw switch and the second fixed port of the SS single-pole double-throw switch are connected directly; The output port of the first amplitude controller is connected with the filter control module.
The filter control module includes a secondary controller, amplifier and filter. Input port of the second amplitude controller is connected to output port of the first amplitude controller. The output port of second amplitude controller is connected to digital signal processing module passing through amplifier and filter.
The digital signal processing module includes the FPGA and the ADC module, ADC module including multi-channel AD conversion unit. The AD conversion unit has the same amount with the signal receiving channel and they are in a one-to-one correspondence. The output port of each receiving channel is connected with the FPGA module through the corresponding AD conversion unit.
The FPGA module is used to compare the received signal with the input calibration signal when the calibration signal is input in each signal receiving channel, and generates the offset compensation table of the signal receiving channel. The offset compensation table is used to calibrate the received signals in the process of signal reception in each signal receiving channel.
As shown in figure 3, a signal receiving method for ATC and DME test systems includes calibration step S1 and signal receiving step S2.
The calibration step S1 includes: S101. Control the gating switch to connect te the calibration signal input port with the channel selector switch; S102. Control selector switch of channel to connect any signal receiving channels and at the same time, the switching switch of the signal receiving channel is connected with the channel selection switch.
S103. The calibration signal input from the calibration signal input port is input into signal receiving channel after passing through the gating switch, the channel selection switch and the switching switch, and after the amplitude control and filtering control are completed in the signal receiving channel, the obtained calibration signal is transmitted to the digital signal processing module.
S104. After the AD conversion of the received signal by the digital signal processing module, the offset compensation table of the current signal receiving channel is obtained from the comparison between the received signal and the signal input at the calibration port.
In the embodiment of this application, the ways to get input signal for calibration port of digital signal processing module include: provide a calibration input signal of A/D converter in the digital signal processing module, after the signal input from the calibration port is converted by the A/D
| converter, the signal is transmitted to FPGA, and the FPGA completes the signal comparison aRd®”° offset compensation table generation.
S105. Switch the channel selector switch to the signal receiving channel of each channel successively, and repeat steps S102-S104 during switching, obtain the offset compensation table of each signal receiving channel.
In the embodiment of this application, when generating the offset compensation table for each signal receiving channel according to steps S102~ S104, it is required to carry out a test under the condition that the third single-pole double-throw switch and the fourth single-pole double-throw switch are switched to the second fixed port which is directly connected, so as to obtain the offset compensation table without passing through the preamplifier. Then switch the third single-pole double-throw switch and the fourth single-pole double-throw switch to the first fixed port, and conduct another test when the preamplifier is connected. Obtain the offset compensation table passing through the preamplifier. In the subsequent signal calibration, according to whether the signal has passed through the preamplifier, the corresponding offset compensation table is selected to calibrate the signal output from the signal receiving channel.
The signal receiving step S2 includes; S201. Control gating switch and connect the signal input port to load resistance so that the calibration signal does not have an input signal receiving channel, S202. Control the switching switch of each signal receiving channel to switch to the signal receiving port to receive the external input signal; S203. After each signal receiving channel performs amplitude control and filtering control on the received signal, it is transmitted to the digital signal processing module.
S204. Digital signal processing module converts the signals from each channel into AD signal and calibrates the signals based on the offset compensation table of each signal receiving channel.
Obviously, the above embodiments are only examples for the purpose of a clear illustration, and are not a limitation on the mode of implementation. For ordinary technicians in their field, other forms of changes or variation may be made on the basis of the above description. It is neither necessary nor possible to enumerate all the modes of implementation. The obvious changes or variations derived therefrom are still within the protection scope of the invention.

Claims (8)

Claims: lu101873
1. A receiving circuit for ATC and DME test systems is characterized in that it includes a calibration signal input interface, digital signal processing module and multi-channel signal receiving channel; Each signal receiving channel is connected to a signal receiving port for receiving external signals. The calibration signal input port is connected with each signal receiving channel through a gating switch and a channel selector switch.
Each of the signal receiving channels includes switching switch, amplitude control module and filter control module. The first input port of the switching switch is connected to the signal input port of the channel, the second input port of the switching switch is connected with the output port of the channel selection switch, and the output of the switching switch is connected with the digital signal processing module through the amplitude control module and the filter control module in turn.; The digital signal processing module is used for comparing the received signal with the input calibration signal to generate an offset compensation table of the signal receiving channel when each signal receiving channel inputs a calibration signal, and the offset compensation table is used to calibrate the received signal during the signal receiving process of each signal receiving channel.
2. According to claim 1, a receiving circuit for ATC and DME test systems is characterized as follows: The described gating switch comprises the first single-pole double-throw switch and a load resistance, the moving port of the first single-pole double-throw switch is connected to the calibration signal input port as an input port; The first stationary port of the first single-pole double-throw switch connect to the input port of the channel selector switch as the output port, and the second stationary port of the single-pole double-throw switch is grounded pass through a load resistance. |
3. According to claim 2, a receiving circuit for ATC and DME test systems has the following characteristics: the channel selector switch is a single-pole multi-throw switch, and the moving port of the single-pole multi-throw switch is used as the input port and is connected to the output port of the selector switch; The fixed port of single-pole multi-throw switch is used as the output port, and the fixed port of the single-pole multi-throw switch has the same amount with the signal receiving channel and they are in a one-to-one correspondence. Each fixed port of single-pole multi-throw switch is connected to the corresponding signal receiving channel.
4.According to claim 1, a receiving circuit for ATC and DME test systems has the following characteristics: the switching switch comprises a second single-pole double-throw switch; The first fixed port of the second single-pole double-throw switch is connected to the signal input port of the channel as the first input port; The second fixed port of the second single-pole double-throw switch is connected to the channel selector switch as the secondary input port, and the moving port of the single-pole double-throw switch is connected to the amplitude control module as the output port.
5.According to claim 1, a receiving circuit for ATC and DME test systems has the following
| | 9 characteristics: the amplitude control module includes a third single-pole double-throw switch! 04 873 fourth single-pole double-throw switch, a preamplifier and a first amplitude controller; The moving port of the third single-pole double-throw switch is connected to the output port of the switching switch, and the moving port of the fourth single-pole double-throw switch is connected to the input port of the first amplitude controller. À preamplifier is connected between the first fixed port of the third single-pole double-throw switch and the first fixed port of the fourth single-pole double-throw switch. The second fixed port of the third single-pole double-throw switch and the second fixed port of the fourth single-pole double-throw switch are connected directly; The output port of the first amplitude controller is connected with the filter control module.
6. According to claim 1, a kind of used for ATC and DME receiving circuit of the testing system, whose character is: the filter control module includes a secondary controller, amplifier and filter. Input port of the second amplitude controller is connected with the output port of the first amplitude controller. The output port of secondary amplitude controller is connected to digital signal processing module pass through amplifier and filter.
7. According to claim 1 a kind of used for ATC and DME receiving circuit of the testing system, whose character is: digital signal processing module includes the FPGA and the ADC module, ADC module includes multi-channel AD conversion unit. The AD conversion unit has the same amount with the signal receiving channel and they are in a one-to-one correspondence, the output port of each signal receiving channel is connected with the FPGA module through the corresponding AD conversion unit.
The FPGA module is used to compare the received signal with the input calibration signal when the calibration signal is input in each signal receiving channel, and generates the offset compensation table of the signal receiving channel. The offset compensation table is used to calibrate the received signals in each signal receiving channel.
8. A signal receiving method for ATC and DME test systems, which adopts the receiving circuit described in any of the items in claim 1 to 7, is characterized by calibration step S1 and signal receiving step S2; The calibration step S1 includes: S101. Control the gating switch to connect te the calibration signal input port with the channel selector switch; S102. Control channel selector switch to connect any signal receiving channels and at the same time, the switching switch of the signal receiving channel is connected with the channel selection switch.
S103.The calibration signal input from the calibration signal input port is input into signal receiving channel after passing through the gating switch, the channel selection switch and the switching switch, and after the amplitude control and filtering control are completed in the signal receiving channel, the obtained calibration signal is transmitted to the digital signal procd$diP 3 module S104. After the AD conversion of the received signal by the digital signal processing module, the offset compensation table of the current signal receiving channel is obtained from the comparison between the received signal and the signal input at the calibration port.
S105. Switch the channel selector switch to each signal receiving channel successively, and repeat steps S102-S104 during switching, obtain the offset compensation table of each signal receiving channel.
The signal receiving step S2 includes; S201. Control gating switch and connect the signal input port to load resistance so that the calibration signal does not input signal receiving channel; S202. Control the gating switch of each signal receiving channel to switch to the signal receiving port and receive the external input signal; S203. After each signal receiving channel performs amplitude control and filtering control on the received signal, it is transmitted to the digital signal processing module.
S204. After the AD conversion of the signal from each signal receiving channel by the digital signal processing module, the signal is calibrated based on the offset compensation table of each signal receiving channel.
LU101873A 2020-06-05 2020-06-22 A receiving circuit and method for atc and dme test systems LU101873B1 (en)

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