CN210724758U - Radio frequency front end transmitting unit of portable communication and navigation tester - Google Patents
Radio frequency front end transmitting unit of portable communication and navigation tester Download PDFInfo
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- CN210724758U CN210724758U CN201922350574.2U CN201922350574U CN210724758U CN 210724758 U CN210724758 U CN 210724758U CN 201922350574 U CN201922350574 U CN 201922350574U CN 210724758 U CN210724758 U CN 210724758U
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Abstract
The utility model discloses a radio frequency front end transmitting unit of portable communication and navigation tester, include: the device comprises three local oscillation generators, two filters, a multiplier, eight switches, an attenuator, a high-power attenuator, two AM (amplitude modulation) modules, five couplers, three amplifiers, a power measurement unit, a radio frequency I/O (input/output) connector, a protection circuit, a voltage standing-wave ratio circuit unit, a frequency divider and an antenna connector. The utility model provides a can provide the radio frequency front end transmitting element of three mode outputs for the portable communication who contains this unit realizes multiple radio signal's measurement with the navigation test appearance.
Description
Technical Field
The utility model relates to an electronic measuring instrument, in particular to radio frequency front end transmitting unit of portable communication and navigation tester.
Background
On an airplane or a ship, since space is limited, conventional communication signal testing and repairing equipment cannot be used, and portable equipment is generally used to reduce the size of detection equipment so as to be practical. However, on the premise of achieving the same technical index, the reduction of the size of the equipment means that various indexes of components for signal processing and acquisition need to be adjusted, and for the realized circuit, improvement needs to be carried out for portable application.
A portable communication and navigation tester is used for communication and maintenance of airplanes, ships and the like, can measure VHF/UHF transmitter frequency, output power, modulation degree (AM and FM) and receiver sensitivity, measure HF transmitter frequency, output power, modulation degree (AM and SSB) and receiver sensitivity to generate ARINC 596 selective calling signals, measure Standing Wave Ratio (SWR) of HF/VHF/UHF antennas and/or feeders, and can set DDM to simulate course and glide-slope signals at the same time, scan and position, and is used for automatic guidance test of coupling (simultaneously simulating course, glide-slope and pointing beacon signals). VOR beacons of different orientations can be simulated, pointing beacons, outer pointing points and middle pointing signals can be simulated, and the frequency, output power and modulation (AM) of a 121.5/243MHz emergency beacon transmitter can be measured. And an audio output for monitoring the scanning audio signal and measuring the frequency and output power of the 406MHz COSPAS/SARSAT emergency beacon transmitter. All locations and user protocols can be decoded and displayed.
How the radio frequency front end unit realizes the transmission of various radio frequency signals is a difficult point in the design of portable communication and navigation testers.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the demand to the radio frequency transmission in portable communication and the navigation tester, provide a radio frequency front end transmitting element of portable communication and navigation tester.
In order to realize the purpose, the utility model discloses a technical scheme be:
a radio frequency front end transmission unit of a portable communication and navigation tester, comprising: the device comprises three local oscillation generators, two filters, a multiplier, eight switches, an attenuator, a high-power attenuator, two AM (amplitude modulation) modules, five couplers, three amplifiers, a power measurement unit, a radio frequency I/O (input/output) connector, a protection circuit, a voltage standing-wave ratio circuit unit, a frequency divider and an antenna connector.
The first local oscillation generator, the first filter, the multiplier, the second filter, the third switch, the fourth switch, the attenuator, the first coupler, the second coupler, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the high-power attenuator and the radio frequency I/O connector are sequentially connected;
the fixed end of the third switch is connected with the second filter, the first movable end is connected with the first movable end of the fourth switch, and the second movable end, the first amplifier and the fixed end of the first switch are sequentially connected; the first moving end of the first switch is connected with the second moving end of the fourth switch, and the second moving end, the third coupler, the fourth coupler and the voltage standing wave ratio circuit unit are sequentially connected;
the stationary end of the fourth switch is connected with an attenuator;
the first coupler is also connected with the second amplifier and the frequency divider in sequence;
the second local oscillation generator, the first AM modulation module and the second coupler are sequentially connected;
the fixed end of the fifth switch is connected with the second coupler, the first movable end of the fifth switch is connected with the first movable end of the sixth switch, and the second movable end, the third amplifier and the second movable end of the sixth switch are sequentially connected;
the sixth switch immovable end is connected with the seventh switch immovable end;
the first movable end of the seventh switch is connected with the fixed end of the eighth switch, and the second movable end of the seventh switch is connected with the fifth coupler;
the first movable end of the eighth switch is connected with the power measuring unit and the high-power attenuator, and the second movable end of the eighth switch is connected with the first movable end of the second switch;
the third local vibration generator, the second AM modulation module and the second movable end of the second switch are sequentially connected;
the second switch immovable end, the fifth coupler, the protection circuit and the antenna connector are connected in sequence.
Preferably, the first local oscillator generator comprises an AD9910, and the AD9910 generates local oscillator signals of 10M-410M.
Preferably, the second local oscillator generator provides a 108MHz signal to a separate phase locked loop synthesizer.
Preferably, the third local oscillator generator provides a 75MHz signal to a separate phase locked loop synthesizer.
Preferably, the ten switches are radio frequency switches and are single-pole double-throw switches.
Preferably, a first connection relationship formed by switching of the switch is included: the first local oscillation generator generates a first local oscillation signal, the first local oscillation signal is filtered by the first filter, enters the multiplier for amplitude modulation and fine adjustment control of output amplitude, is filtered by the second filter, and then enters the first amplifier, the third coupler, the fourth coupler and the voltage standing-wave ratio circuit unit in sequence through the switching of the third switch,
and the other path of the signal enters an attenuator, a first coupler and a second coupler in sequence, passes through a switchable amplifier consisting of a fifth switch, a third amplifier and a sixth switch, and is connected to a high-power attenuator and a radio frequency I/O connector in sequence by using the switching selection of a seventh switch and an eighth switch or is connected to the fifth coupler, a protection circuit and an antenna connector in sequence.
Preferably, the method includes a second connection relationship formed by switching of the switch on the basis of the first connection relationship: the second local oscillator generator generates a second local oscillator signal, the second local oscillator signal is output to the second coupler after being modulated by the first AM modulation module, and the second local oscillator signal and the first local oscillator signal are synthesized by the second coupler to form dual-mode output.
Preferably, the method includes a third connection relationship formed by switching of the switch on the basis of the second connection relationship: and the third local oscillator generator generates a third local oscillator signal, the third local oscillator signal is output to the fifth coupler after being modulated by the second AM modulation module, and the third local oscillator signal and the dual-mode output are synthesized into a three-mode output.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
compared with the prior art, the utility model discloses a realize multiple measurement function's set, adopted three this vibration generator: when single-mode output is carried out, the first local oscillator generator generates local oscillator signals of 10M-410M, the local oscillator signals are generated by AD9910, the phase noise of the local oscillator signals generated by the AD9910 is smaller than-90 dBc, and the stray is smaller than-50 dBc; when the dual-mode output is carried out (course and glide-slope modes), the second local oscillator generator is used as a second radio-frequency signal provided by an independent phase-locked loop synthesizer; in the case of three-mode output, the third local oscillator generates a single 75MHz signal: a pointing beacon signal; the pointing beacon signal is obtained by amplitude modulation of three local oscillators; the pointing beacon signal is output to the antenna port connector through the radio frequency switch and the coupler through channel; the input signal of the other dual mode enters a coupling port of the coupler; after the coupler power is combined, the three-mode output is output. The utility model provides a can provide the radio frequency front end transmitting element of three mode outputs for the portable communication who contains this unit realizes multiple radio signal's measurement with the navigation test appearance.
Drawings
Fig. 1 is a schematic diagram of the circuit connection of the present invention.
Fig. 2 is a circuit connection diagram of the AD 9910.
Fig. 3 is a schematic circuit diagram of a second local oscillator generator.
Fig. 4 is a schematic circuit connection diagram of a third local oscillator generator.
Fig. 5 is a circuit connection diagram of the first coupler and the second coupler.
Fig. 6 is a circuit connection diagram of the frequency divider.
Fig. 7 is a schematic circuit connection diagram of the fifth switch, the sixth switch, the seventh switch, and the eighth switch.
Fig. 8 is a circuit connection diagram of the intermediate frequency output module after frequency mixing.
Fig. 9 is a circuit connection diagram of the crystal oscillator.
FIG. 10 is a schematic diagram of the electrical connections of the RF I/O connector.
Fig. 11 is a schematic diagram of the circuit connection between the protection circuit and the antenna connector.
Fig. 12 is a schematic circuit diagram of the portable communication and navigation tester.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Fig. 12 is a schematic block diagram of the overall design of the portable communication and navigation tester, wherein how the rf front-end unit transmits multiple rf signals is a difficult point in the design of the portable communication and navigation tester.
Referring to fig. 1, a radio frequency front end transmitting unit of a portable communication and navigation tester comprises: the device comprises three local oscillation generators, two filters, a multiplier, eight switches, an attenuator, a high-power attenuator, two AM (amplitude modulation) modules, five couplers, three amplifiers, a power measurement unit, a radio frequency I/O (input/output) connector, a protection circuit, a voltage standing-wave ratio circuit unit, a frequency divider and an antenna connector.
The first local oscillation generator, the first filter, the multiplier, the second filter, the third switch, the fourth switch, the attenuator, the first coupler, the second coupler, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the high-power attenuator and the radio frequency I/O connector are sequentially connected;
the fixed end of the third switch is connected with the second filter, the first movable end is connected with the first movable end of the fourth switch, and the second movable end, the first amplifier and the fixed end of the first switch are sequentially connected; the first moving end of the first switch is connected with the second moving end of the fourth switch, and the second moving end, the third coupler, the fourth coupler and the voltage standing wave ratio circuit unit are sequentially connected;
the stationary end of the fourth switch is connected with an attenuator;
as shown in fig. 5 and fig. 6, the first coupler is further connected with the second amplifier and the frequency divider in sequence;
the second local oscillation generator, the first AM modulation module and the second coupler are sequentially connected;
as shown in fig. 7, the fixed end of the fifth switch is connected to the second coupler, the first moving end is connected to the first moving end of the sixth switch, and the second moving end, the third amplifier, and the second moving end of the sixth switch are sequentially connected;
the sixth switch immovable end is connected with the seventh switch immovable end;
the first movable end of the seventh switch is connected with the fixed end of the eighth switch, and the second movable end of the seventh switch is connected with the fifth coupler;
as shown in fig. 10, the first moving end of the eighth switch is connected to the power measuring unit and the high-power attenuator, and the second moving end is connected to the first moving end of the second switch; the high-power attenuator is connected with the radio frequency I/O connector;
the third local vibration generator, the second AM modulation module and the second movable end of the second switch are sequentially connected;
as shown in fig. 11, the second switch stationary terminal, the fifth coupler, the protection circuit, and the antenna connector are connected in sequence.
As shown in FIG. 2, the first local oscillator generator comprises an AD9910, and the AD9910 generates local oscillator signals of 10M-410M.
As shown in fig. 3, the second local oscillator generator includes a waveform generator ADF4351 and a multiplier ADL5391, which is a single phase-locked loop synthesizer that provides a 108MHz signal.
Referring to fig. 4, the third local oscillator generator includes a waveform generator ADF4351 and a multiplier ADL5391, which is a single pll synthesizer that provides a 75MHz signal.
When the module is in a module transmitting mode, a first connection relation, a second connection relation and a third connection relation are adopted;
the first connection is a single mode output: a local oscillator generates a local oscillator signal of 10M-410M, the local oscillator signal is generated by AD9910, the phase noise of the local oscillator signal generated by the AD9910 is less than-90 dBc, the stray is less than-50 dBc, the local oscillator signal enters a multiplier through switch switching, amplitude modulation and output amplitude fine-tuning control are carried out, after low-pass filtering, one path of the local oscillator signal enters a standing wave test port through a single-pole double-throw switch, the other path of the local oscillator signal enters an attenuator circuit, and the attenuator circuit can be divided into a 1dB stepping 31dB attenuator and two fixed 31dB attenuators. The radio frequency signal after passing through the attenuator circuit passes through two couplers.
The second connection relationship is a dual-mode output: the two local oscillators are used as a second radio frequency signal provided by a single phase-locked loop synthesizer. The second radio frequency signal and a local oscillator radio frequency signal are synthesized and output through the coupler. After the switchable amplifier, two single pole double throw switches are used to select either the radio frequency I/O connector or the antenna connector. When the radio frequency I/O connector is selected, the signal is switched to the 20dB high power attenuator by the switch and then output to the radio frequency I/O connector. When the antenna port connector is selected, the signal path depends on the mode of operation of the output signal. If single or dual mode is selected, the signal is routed to another radio frequency switch and then through the antenna connector leading to the directional coupler.
The third connection relationship is three-mode output: three local oscillators produce a single 75MHz signal: a beacon signal is pointed. The pointing beacon signal is obtained by amplitude modulation of three local oscillators. The pointing beacon signal is output to the antenna port connector through the radio frequency switch and the coupler through channel. The input signal of the dual mode enters the coupling port of the coupler. After the coupler power is combined, the three-mode output is output.
In the module reception mode, a fourth connection relationship is adopted: signals enter the radio frequency channel board from the radio frequency I/O connector or the antenna connector.
The power protection circuit is input behind the antenna port connector. If a high power signal is inadvertently input to the antenna port connector, the detected signal level is compared to switch off the input switch. And additionally to the control panel, the software alerts the operator that an overload condition exists. Under normal operating conditions a signal is input to the antenna port connector through the protection circuit, through the directional coupler and the radio frequency switch to the power amplifier bypass switch.
When the radio frequency I/O connector input is selected, the signal passes through a 20dB high power attenuator. The attenuator can pass input signals of up to 30W. A temperature sensor is arranged beside the attenuator. And if the temperature rises too much, reminding the operation.
After the attenuator, the resistive power divider sends a portion of the received signal to the power detection circuit. The other port of the resistance power divider sends signals to the radio frequency switch. From this point on, the antenna port connector and the radio frequency I/O connector enter the same common path.
The received signal bypasses the power amplifier through the RF switch and is coupled to the input of the frequency counting circuit through the coupling terminal of the directional coupler. The input of the phase-locked loop chip is used as a frequency counter frequency divider through a logarithmic amplifier chip as a limiter. The phase-locked loop chip provides a programmable divider that sends the divided output to the FPGA of the control board.
The direct-through end of the directional coupler enters a mixing circuit through a low-pass filter after being switched by an RF switch, receives a signal and a local oscillator signal generated by a local oscillator to obtain a 3MHz intermediate frequency signal after mixing, and sends the intermediate frequency signal to a control board to perform digital down-conversion processing and complete modulation and demodulation of AM, FM and the like.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A radio frequency front end transmitter unit for a portable communications and navigation tester, comprising: the system comprises three local vibration generators, two filters, a multiplier, eight switches, an attenuator, a high-power attenuator, two AM (amplitude modulation) modules, five couplers, three amplifiers, a power measurement unit, a radio frequency I/O (input/output) connector, a protection circuit, a voltage standing-wave ratio circuit unit, a frequency divider and an antenna connector;
the first local oscillation generator, the first filter, the multiplier, the second filter, the third switch, the fourth switch, the attenuator, the first coupler, the second coupler, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the high-power attenuator and the radio frequency I/O connector are sequentially connected;
the fixed end of the third switch is connected with the second filter, the first movable end of the fourth switch is connected with the first movable end of the fourth switch, and the second movable end, the first amplifier and the fixed end of the first switch are sequentially connected; the first movable end of the first switch is connected with the second movable end of the fourth switch, and the second movable end, the third coupler, the fourth coupler and the voltage standing wave ratio circuit unit are sequentially connected;
the immobile end of the fourth switch is connected with an attenuator;
the first coupler is also connected with the second amplifier and the frequency divider in sequence;
the second local oscillation generator, the first AM modulation module and the second coupler are sequentially connected;
the fixed end of the fifth switch is connected with the second coupler, the first movable end of the fifth switch is connected with the first movable end of the sixth switch, and the second movable end, the third amplifier and the second movable end of the sixth switch are sequentially connected;
the sixth switch fixed end is connected with the seventh switch fixed end;
the first movable end of the seventh switch is connected with the fixed end of the eighth switch, and the second movable end of the seventh switch is connected with the fifth coupler;
the first moving end of the eighth switch is connected with the power measuring unit and the high-power attenuator, and the second moving end of the eighth switch is connected with the first moving end of the second switch;
the third local vibration generator, the second AM modulation module and the second movable end of the second switch are sequentially connected;
the second switch immovable end, the fifth coupler, the protection circuit and the antenna connector are connected in sequence.
2. The radio frequency front end transmitting unit of the portable communication and navigation tester as claimed in claim 1, wherein the first local oscillator generator comprises an AD9910, and the AD9910 generates local oscillator signals of 10M to 410M.
3. The radio frequency front end transmit unit of a portable communications and navigation tester as recited in claim 1, wherein the second local oscillator generator provides a 108MHz signal to a separate phase locked loop synthesizer.
4. The radio frequency front end transmit unit of a portable communications and navigation tester as recited in claim 1, wherein the third local oscillator generator provides a 75MHz signal to a single phase locked loop synthesizer.
5. The radio frequency front end transmitting unit of a portable communication and navigation tester as recited in claim 1, wherein the ten switches are radio frequency switches and are single pole double throw switches.
6. The radio frequency front end transmitting unit of a portable communication and navigation tester as recited in claim 1, comprising a first connection relationship formed by switching of a switch: the first local oscillation generator generates a first local oscillation signal, the first local oscillation signal is filtered by the first filter, enters the multiplier for amplitude modulation and fine adjustment control of output amplitude, is filtered by the second filter, and then enters the first amplifier, the third coupler, the fourth coupler and the voltage standing-wave ratio circuit unit in sequence through the switching of the third switch,
and the other path of the signal enters the attenuator, the first coupler and the second coupler in sequence, passes through a switchable amplifier consisting of the fifth switch, the third amplifier and the sixth switch, and is connected to the high-power attenuator and the radio frequency I/O connector in sequence by utilizing the switching selection of the seventh switch and the eighth switch or is connected to the fifth coupler, the protection circuit and the antenna connector in sequence.
7. The radio frequency front end transmitting unit of a portable communication and navigation tester as recited in claim 6, comprising a second connection relationship formed by switching of the switch based on the first connection relationship: the second local oscillator generator generates a second local oscillator signal, the second local oscillator signal is output to the second coupler after being modulated by the first AM modulation module, and the second local oscillator signal and the first local oscillator signal are synthesized by the second coupler to form dual-mode output.
8. The radio frequency front end transmitting unit of a portable communication and navigation tester as claimed in claim 7, comprising a third connection relationship formed by switching of the switch based on the second connection relationship: and the third local oscillator generator generates a third local oscillator signal, the third local oscillator signal is output to the fifth coupler after being modulated by the second AM modulation module, and the third local oscillator signal and the dual-mode output are synthesized into a three-mode output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922350574.2U CN210724758U (en) | 2019-12-24 | 2019-12-24 | Radio frequency front end transmitting unit of portable communication and navigation tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922350574.2U CN210724758U (en) | 2019-12-24 | 2019-12-24 | Radio frequency front end transmitting unit of portable communication and navigation tester |
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| CN210724758U true CN210724758U (en) | 2020-06-09 |
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| CN201922350574.2U Active CN210724758U (en) | 2019-12-24 | 2019-12-24 | Radio frequency front end transmitting unit of portable communication and navigation tester |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049535A (en) * | 2019-12-24 | 2020-04-21 | 成都前锋电子仪器有限责任公司 | Radio frequency front end transmitting unit of portable communication and navigation tester |
| CN111049535B (en) * | 2019-12-24 | 2024-05-31 | 成都前锋电子仪器有限责任公司 | Radio frequency front end transmitting unit of portable communication and navigation tester |
-
2019
- 2019-12-24 CN CN201922350574.2U patent/CN210724758U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049535A (en) * | 2019-12-24 | 2020-04-21 | 成都前锋电子仪器有限责任公司 | Radio frequency front end transmitting unit of portable communication and navigation tester |
| CN111049535B (en) * | 2019-12-24 | 2024-05-31 | 成都前锋电子仪器有限责任公司 | Radio frequency front end transmitting unit of portable communication and navigation tester |
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