CN111064492B - Radio frequency front end unit of portable communication and navigation tester - Google Patents
Radio frequency front end unit of portable communication and navigation tester Download PDFInfo
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- CN111064492B CN111064492B CN201911348255.6A CN201911348255A CN111064492B CN 111064492 B CN111064492 B CN 111064492B CN 201911348255 A CN201911348255 A CN 201911348255A CN 111064492 B CN111064492 B CN 111064492B
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- 238000004891 communication Methods 0.000 title claims abstract description 18
- 238000005259 measurement Methods 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 6
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- 238000010586 diagram Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
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- 239000013078 crystal Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The invention discloses a radio frequency front end unit of a portable communication and navigation tester, which comprises: three local oscillator generators, three filters, multipliers, ten switches, attenuators, high-power attenuators, mixers, two AM modulation modules, five couplers, three amplifiers, a power measuring unit, a radio frequency I/O connector, a protection circuit, a voltage standing wave ratio circuit unit, an intermediate frequency output unit, a frequency divider and an antenna connector. Compared with the prior art, the invention adds the mixer and the two radio frequency switches on the circuit with three-mode output, can output intermediate frequency signals, namely integrates the receiving circuit on the radio frequency transmitting circuit, and the radio frequency front end unit has a transmitting mode and a receiving mode, so that the portable communication and navigation tester circuit comprising the unit is smaller in size and more convenient to carry.
Description
Technical Field
The present invention relates to an electronic measuring instrument, and more particularly, to a radio frequency front end unit of a portable communication and navigation tester.
Background
On aircraft, ships, conventional communication signal testing and inspection equipment cannot be used due to limited space, and portable equipment is often employed to reduce the size of the inspection equipment for practical use. However, the reduction in the size of the device, on the premise of reaching the same technical specifications, means that the various specifications of the components for signal processing and acquisition are to be adjusted, and improvements for portable applications are required for the implemented circuits.
The portable communication and navigation tester is used for communication and maintenance of aircrafts, ships and the like, can measure VHF/UHF transmitter frequency, output power, modulation degrees (AM and FM) and receiver sensitivity, can measure HF transmitter frequency, output power, modulation degrees (AM and SSB) and receiver sensitivity to generate ARINC596 selective call signals, can measure Standing Wave Ratio (SWR) of HF/VHF/UHF antennas and/or feeder lines, can set DDM to simulate course and glidepath signals, and can scan and position for automatic pilot test of coupling (simultaneously simulate course, glidepath and pointing beacon signals). VOR beacons in different directions can be simulated, pointing beacons, external pointing and middle pointing signals are simulated, and the frequency, output power and modulation degree (AM) of the 121.5/243MHz emergency beacon transmitter are measured. An audio output for monitoring the scanning audio signal, measuring 406MHz COSPAS/SARSAT the frequency, output power of the emergency beacon transmitter. All location and user protocols can be decoded and displayed. How the rf front-end unit transmits and receives various rf signals is a difficulty in designing a portable communication and navigation tester.
Disclosure of Invention
The invention provides a radio frequency front end unit of a portable communication and navigation tester aiming at the requirements of the portable communication and navigation tester for radio frequency transmission and reception.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
A radio frequency front end unit for a portable communications and navigation tester, comprising: the device comprises three local oscillator generators, three filters, multipliers, ten switches, attenuators, a high-power attenuator, a mixer, two AM modulation modules, five couplers, three amplifiers, a power measurement unit, a radio frequency I/O connector, a protection circuit, a voltage standing wave ratio circuit unit, an intermediate frequency output unit, a frequency divider and an antenna connector;
the first local oscillator generator, the first filter, the first switch, the multiplier, the second switch, 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 first switch is connected with the output end of the first filter, the first movable end of the first switch is connected with the input end of the multiplier, and the second movable end of the first switch is connected with the first input end of the mixer;
The first moving end of the second switch is connected with the output end of the multiplier, the second moving end of the second switch is connected with the second input end of the mixer, and the stationary end of the second switch is connected with the second filter; the output end of the mixer, the third filter and the intermediate frequency output unit are sequentially connected;
The fixed end of the third switch is connected with the second filter, the first movable end of the third switch is connected with the first movable end of the fourth switch, and the second movable end, the first amplifier and the ninth switch fixed end are sequentially connected; the first moving end of the ninth 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 fixed end of the fourth switch is connected with the attenuator;
the first coupler is also connected with the second amplifier and the frequency divider in sequence;
the second local oscillator generator, the first AM modulation module and the second coupler are connected in sequence;
The first movable end of the fifth switch is connected with the first movable end of the sixth switch, and the second movable end of the fifth switch, 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 moving end of the seventh switch is connected with the eighth switch fixed end, and the second moving 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 tenth switch;
The third local oscillator generator, the second AM modulation module and the second movable end of the tenth switch are sequentially connected;
the tenth switch fixed end, the fifth coupler, the protection circuit and the antenna connector are sequentially connected.
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 the 108MHz signal as a separate phase locked loop synthesizer.
Preferably, the third local oscillator generator provides the 75MHz signal as a separate phase locked loop synthesizer.
Preferably, the ten switches are radio frequency switches and are single pole double throw switches.
Preferably, the connection relation of the signal input antenna connector formed by the switching of the switch is included:
When the antenna connector input is selected, a signal is input to the antenna connector and sequentially input to the fifth switch through the protection circuit, the fifth coupler, the tenth switch, the eighth switch, the seventh switch and the sixth switch.
Preferably, the connection relation of the signal input radio frequency I/O connector formed by the switching of the switch is included:
When the radio frequency I/O connector is selected for input, after the signal passes through the high-power attenuator, the resistor power divider sends part of the received signal to the power measurement unit, and the signal of the other port of the resistor power divider sequentially passes through the eighth switch, the seventh switch and the sixth switch and is input to the fifth switch.
Preferably, the connection relation formed by the switching of the switch is included: the signal output by the fifth switch sequentially passes through the second coupler and the first coupler and is then divided into two paths of output, and one path of output is output to the input end of the frequency divider through the second amplifier;
The other path sequentially passes through the attenuator, the fourth switch, the third switch, the second filter and the second switch, enters the mixer and mixes with the local oscillation signal generated by the first local oscillation generator to obtain an intermediate frequency signal, and the intermediate frequency signal is sent to the control board by the intermediate frequency output module.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows: compared with the prior art, the invention adds the mixer and the two radio frequency switches on the circuit with three-mode output, can output intermediate frequency signals, namely integrates the receiving circuit on the radio frequency transmitting circuit, and the radio frequency front end unit has a transmitting mode and a receiving mode, so that the portable communication and navigation tester circuit comprising the unit is smaller in size and more convenient to carry.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of circuit connection of the mixer and the intermediate frequency output module.
Fig. 3 is a schematic circuit connection diagram of the crystal oscillator.
Fig. 4 is a schematic circuit diagram of a portable communication and navigation tester.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Fig. 4 is a schematic block diagram of the overall design of the portable communication and navigation tester, in which how the rf front-end unit transmits and receives various rf signals is a difficulty in designing the portable communication and navigation tester.
Referring to fig. 1, a radio frequency front end unit of a portable communication and navigation tester includes: the device comprises three local oscillator generators, three filters, multipliers, ten switches, attenuators, a high-power attenuator, a mixer, two AM modulation modules, five couplers, three amplifiers, a power measurement unit, a radio frequency I/O (input/output) unit, a protection circuit, a voltage standing wave ratio circuit unit, an intermediate frequency output unit and a frequency divider; also included is a crystal oscillator unit as described in fig. 3, which provides a reference signal for the circuit.
The first local oscillator generator, the first filter, the first switch, the multiplier, the second switch, 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 first switch is connected with the output end of the first filter, the first movable end is connected with the input end of the multiplier, and the second movable end is connected with the first input end of the mixer;
The first moving end of the second switch is connected with the output end of the multiplier, the second moving end of the second switch is connected with the second input end of the mixer, and the stationary end of the second switch is connected with the second filter; the output end of the mixer, the third filter and the intermediate frequency output unit are connected in sequence;
the fixed end of the third switch is connected with the second filter, the first movable end of the third switch is connected with the first movable end of the fourth switch, and the second movable end, the first amplifier and the ninth switch are sequentially connected; the first moving end of the ninth 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 fixed end of the fourth switch is connected with the attenuator;
the first coupler is also connected with the second amplifier and the frequency divider in sequence;
the second local oscillator generator, the first AM modulation module and the second coupler are connected in sequence;
The fixed end of the fifth switch is connected with the second coupler, the first movable end of the sixth switch is connected with the first movable end of the sixth switch, and the second movable end of the second switch, 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 moving end of the seventh switch is connected with the fixed end of the eighth switch, and the second moving 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 tenth switch;
the third local oscillator generator, the second AM modulation module and the second movable end of the tenth switch are sequentially connected;
the tenth switch fixed end, the fifth coupler and the protection circuit are connected in sequence.
In the module receiving mode, signals enter the radio frequency channel plate through the radio frequency I/O connector or the antenna connector.
An input power protection circuit is provided 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 turn off the input switch. And additionally to the control panel, the software alerts the operator to the presence of an overload condition. Under normal operating conditions signals are 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 may pass an input signal of up to 30W. A temperature sensor is arranged beside the attenuator. And if the temperature rise is excessive, operating the reminding.
After the attenuator, the resistive power divider passes a portion of the received signal to the power measurement unit. The other port of the resistive power divider sends a signal to the radio frequency switch. From this point, the antenna port connector and the radio frequency I/O connector are input to 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 end of the directional coupler. The input of the phase-locked loop chip is used as a frequency divider of the frequency counter through the 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-connection end of the directional coupler enters a mixing circuit through a low-pass filter after being switched by an RF switch, as shown in figure 2, the receiving signal is mixed with a local oscillation signal generated by a local oscillation to obtain an intermediate frequency signal of 3MHz, and the intermediate frequency signal is sent to a control board for digital down-conversion processing, and modulation and demodulation such as AM, FM and the like are completed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. A radio frequency front end unit for a portable communications and navigation tester, comprising: the device comprises three local oscillator generators, three filters, multipliers, ten switches, attenuators, a high-power attenuator, a mixer, two AM modulation modules, five couplers, three amplifiers, a power measurement unit, a radio frequency I/O connector, a protection circuit, a voltage standing wave ratio circuit unit, an intermediate frequency output unit, a frequency divider and an antenna connector;
the first local oscillator generator, the first filter, the first switch, the multiplier, the second switch, 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 first switch is connected with the output end of the first filter, the first movable end of the first switch is connected with the input end of the multiplier, and the second movable end of the first switch is connected with the first input end of the mixer;
The first moving end of the second switch is connected with the output end of the multiplier, the second moving end of the second switch is connected with the second input end of the mixer, and the stationary end of the second switch is connected with the second filter; the output end of the mixer, the third filter and the intermediate frequency output unit are sequentially connected;
The fixed end of the third switch is connected with the second filter, the first movable end of the third switch is connected with the first movable end of the fourth switch, and the second movable end, the first amplifier and the ninth switch fixed end are sequentially connected; the first moving end of the ninth 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 fixed end of the fourth switch is connected with the attenuator;
the first coupler is also connected with the second amplifier and the frequency divider in sequence;
the second local oscillator generator, the first AM modulation module and the second coupler are connected in sequence;
The first movable end of the fifth switch is connected with the first movable end of the sixth switch, and the second movable end of the fifth switch, 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 moving end of the seventh switch is connected with the eighth switch fixed end, and the second moving 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 tenth switch;
The third local oscillator generator, the second AM modulation module and the second movable end of the tenth switch are sequentially connected;
The tenth switch fixed end, the fifth coupler, the protection circuit and the antenna connector are sequentially connected;
The connection relation of the signal input antenna connector formed by the switching of the switch is also included:
When the antenna connector input is selected, a signal is input to the antenna connector and sequentially input to the fifth switch through the protection circuit, the fifth coupler, the tenth switch, the eighth switch, the seventh switch and the sixth switch;
the connection relation of the signal input radio frequency I/O connector formed by the switching of the switch is also included:
When the radio frequency I/O connector is selected for input, after a signal passes through the high-power attenuator, the resistor power divider sends part of the received signal to the power measurement unit, and a signal of the other port of the resistor power divider sequentially passes through the eighth switch, the seventh switch and the sixth switch and is input to the fifth switch;
The method further comprises the following connection relation formed by switching of the switch:
the signal output by the fifth switch sequentially passes through the second coupler and the first coupler and is then divided into two paths of output, and one path of output is output to the input end of the frequency divider through the second amplifier;
The other path sequentially passes through the attenuator, the fourth switch, the third switch, the second filter and the second switch, enters the mixer and mixes with the local oscillation signal generated by the first local oscillation generator to obtain an intermediate frequency signal, and the intermediate frequency signal is sent to the control board by the intermediate frequency output unit.
2. The radio frequency front end unit of claim 1, wherein the first local oscillator generator comprises an AD9910, the AD9910 generating a local oscillator signal of 10M to 410M.
3. The radio frequency front end unit of claim 1, wherein the second local oscillator generator provides a 108MHz signal as a separate phase locked loop synthesizer.
4. The radio frequency front end unit of claim 1, wherein the third local oscillator generator provides a 75MHz signal as a separate phase locked loop synthesizer.
5. The rf front-end unit of claim 1, wherein the ten switches are rf switches and are single pole double throw switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911348255.6A CN111064492B (en) | 2019-12-24 | Radio frequency front end unit of portable communication and navigation tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911348255.6A CN111064492B (en) | 2019-12-24 | Radio frequency front end unit of portable communication and navigation tester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111064492A CN111064492A (en) | 2020-04-24 |
| CN111064492B true CN111064492B (en) | 2024-06-04 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204331377U (en) * | 2014-12-30 | 2015-05-13 | 中海电信有限公司 | Marine communication navigator signal tester |
| CN105281850A (en) * | 2015-11-13 | 2016-01-27 | 成都前锋电子仪器有限责任公司 | Handheld radio comprehensive tester |
| CN205353227U (en) * | 2015-12-23 | 2016-06-29 | 四川天中星航空科技有限公司 | Navigation communication test appearance |
| CN107806889A (en) * | 2017-11-28 | 2018-03-16 | 天津七六四通信导航技术有限公司 | A kind of aircraft navigation instrument and its landing comprehensive tester |
| CN210724787U (en) * | 2019-12-24 | 2020-06-09 | 成都前锋电子仪器有限责任公司 | Radio frequency front end unit of portable communication and navigation tester |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204331377U (en) * | 2014-12-30 | 2015-05-13 | 中海电信有限公司 | Marine communication navigator signal tester |
| CN105281850A (en) * | 2015-11-13 | 2016-01-27 | 成都前锋电子仪器有限责任公司 | Handheld radio comprehensive tester |
| CN205353227U (en) * | 2015-12-23 | 2016-06-29 | 四川天中星航空科技有限公司 | Navigation communication test appearance |
| CN107806889A (en) * | 2017-11-28 | 2018-03-16 | 天津七六四通信导航技术有限公司 | A kind of aircraft navigation instrument and its landing comprehensive tester |
| CN210724787U (en) * | 2019-12-24 | 2020-06-09 | 成都前锋电子仪器有限责任公司 | Radio frequency front end unit of portable communication and navigation tester |
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