CN109462410A - A kind of transmitter and its signal processing method - Google Patents
A kind of transmitter and its signal processing method Download PDFInfo
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- CN109462410A CN109462410A CN201811331724.9A CN201811331724A CN109462410A CN 109462410 A CN109462410 A CN 109462410A CN 201811331724 A CN201811331724 A CN 201811331724A CN 109462410 A CN109462410 A CN 109462410A
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- 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
- H04B1/02—Transmitters
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Abstract
The present invention provides a kind of transmitter and its signal processing method, the main channel of transmitter includes modulating part and emitting portion, emitting portion transmitting is sent to after the corresponding input signal in main channel and the modulated partial modulation of local oscillation signal, modulating part includes frequency mixer and working frequency selection device, input signal and local oscillation signal are mixed to export a certain working frequency through frequency mixer, since working frequency selection device selects the corresponding working frequency of output channel of conducting for the working frequency of mixer output, therefore the signal of mixer output can pass through working frequency selection device and filter out the frequency component other than relevant work frequency, finally emitted by emitting portion.The present invention makes any main channel and can be realized TCAS inquiry transmitting, S mode response (A of response containing aviation management C mode) transmitting and ADS-B three functions of transmitting in the case where effectively inhibiting the frequency component other than relevant work frequency.
Description
Technical field
The invention belongs to aviation management system regions more particularly to a kind of transmitters and its signal processing method.
Background technique
Usually in aviation management system, (Traffic Collision Avoidance System is empty by the TCAS of secondary radar
Middle anti-collision system) inquiry system transmitter working frequency be 1030MHz, and S mode answering machine (A of response containing aviation management C mould
Formula) in transmitter (Automatic Dependent Surveillance-Broadcast broadcast type is automatically related to ADS-B
Monitoring) the working frequency of transmitter be 1090MHz.For the development for adapting to aviation management equipment Market, the field is specialized in
To secondary radar emissions machine, more stringent requirements are proposed and challenge for manufacturing industry manufacturer, is directed to above-mentioned different transmitting in the prior art
Machine is independent production, manufacture, be mainly shown as have a single function, be wide in variety, equipment dispersion, the defects of synthesization degree is not strong.
Summary of the invention
To solve above-mentioned the technical issues of mentioning in the prior art, the present invention provides a kind of transmitter and its signal processing side
Method, concrete scheme are as follows:
A kind of transmitter, including main channel, the main channel include modulating part and emitting portion；
The modulating part includes frequency mixer and working frequency selection device, the output end of the frequency mixer and the work
The input terminal of frequency selection device connects, and the working frequency selection device has multiple output channels, each output channel point
Not Dui Ying a working frequency, the working frequency selection device selects one of output channel conducting and closes other outputs
Channel, the working frequency selection device select the corresponding working frequency of output channel of conducting for the work of mixer output
Frequency；
The emitting portion transmitting is sent to through the modulated signal of the modulating part.
Further, the modulating part further includes 120MHz bandstop filter, the 120MHz bandstop filter it is defeated
Outlet is connect with the input terminal of the frequency mixer.
Further, the working frequency selection device includes 1030MHz bandpass filter, 1090MHz bandpass filter
And two single-pole double-throw switch (SPDT)s；
One end of one of single-pole double-throw switch (SPDT) is connected with the output end of the frequency mixer, the other end selectively with institute
The input terminal for stating one of bandpass filter of 1030MHz bandpass filter or 1090MHz bandpass filter is connected；
One end of another single-pole double-throw switch (SPDT) selectively with the 1030MHz bandpass filter or 1090MHz band logical
The output end of one of bandpass filter of filter is connected.
Further, the modulating part further includes sequentially connected primary amplifier, the first bandpass filter, program-controlled declines
Subtract device, driving amplifier, isolator, final amplifier；
The input terminal of the primary amplifier is connect with the output end of the working frequency selection device；
First bandpass filter allow by the frequency range of signal include institute in working frequency selection device
There is working frequency.
Further, the emitting portion includes circulator and antenna, the circulator respectively with antenna and receiver
Connection, the power of the loss of signal Partial Power transmitted through the circulator to the antenna, loss are received by the receiver；
The received external signal of antenna is sent to the receiver through the circulator.
Further, any main channel is using in a kind of main channel or both main channel types of two class main channels
One of type；
The quantity of the emitting portion of one kind main channel is one, and the modulating part is connect with the emitting portion；
The quantity of the emitting portion of two class main channel is two, and the modulating part is switched equipped with high-power switching,
The modulating part is optionally connected to one of emitting portion of the two emitting portions by high-power switching switch.
Further, the emitting portion includes antenna, power detector and antenna detection device；
The power detector is used to detect the forward power and backward power of the emission port of antenna；
The antenna detection device judges the internal resistance and connection status of respective antenna by voltage change.
Further, the transmitter further includes first power splitter and two the second power splitters, the main channel
Quantity is four；
First power splitter and the second power splitter are an input terminal and two output ends, first power splitter
Two output ends are separately connected the input terminal of two second power splitters, four output ends point of two second power splitters
It is not connected to the input terminal of the frequency mixer of four main channels.
A kind of signal processing method of transmitter as described above, when the transmitter emits signal, any master is logical
Road corresponds to input signal to be launched all the way, and the input signal and local oscillation signal are sent to the modulating part, through the tune
Signal after partial modulation processed is emitted by the emitting portion；
Two paths of signals into the modulating part is mixed to export a certain working frequency in frequency mixer, frequency mixer it is defeated
Signal is sent to working frequency selection device out, makes the corresponding output channel conducting of the working frequency, and other output channels
It closes.
Further, when transmitter receives signal, receiving channel is that the external signal received is transmitted to and institute from antenna
It states the connected circulator of antenna and is resent to receiver and be formed by signal transmission channel；
Receiving channel meets following require:
Receiving channel Insertion Loss :≤2.5dB；
Receiving channel isolation: >=20dB.
Compared with prior art, the main channel of transmitter of the invention includes modulating part and emitting portion, main channel pair
Be sent to after the modulated partial modulation of input signal and local oscillation signal answered emitting portion transmitting, modulating part include frequency mixer and
Working frequency selection device, input signal and local oscillation signal are mixed to export a certain working frequency through frequency mixer, due to work frequency
Rate selection device selects the corresponding working frequency of output channel of conducting for the working frequency of mixer output, therefore frequency mixer
The signal of output end can pass through working frequency selection device and filter out the frequency component other than relevant work frequency, most
Emitted eventually by emitting portion.The present invention can adapt in the case where effectively inhibiting the frequency component other than relevant work frequency
The transmitting of the signal of a variety of different operating frequencies, so that any main channel can be realized TCAS inquiry transmitting, S mode response
(A of response containing aviation management C mode) transmitting and ADS-B emit three functions, and synthesization degree is high, do not need again for different hairs
Penetrate the transmitter that function selects different cultivars.
Detailed description of the invention
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein:
Fig. 1 is the working principle block diagram of the transmitter of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the transmitter of the embodiment of the present invention.
In the accompanying drawings, identical component uses identical appended drawing reference, and attached drawing is not drawn to scale.
Specific embodiment
The present invention will be further explained below with reference to the accompanying drawings.
As shown in Figure 1, the transmitter includes four main channels the present embodiment provides a kind of transmitter, respectively 0 degree master is logical
4,90 degree of road main channel 5,180 degree main channel 6 and 270 degree main channel 7, wherein 0 degree of 4,90 degree of main channel main channel 5 and 180 degree
Main channel 6 is a kind of main channel, and 270 degree of main channels 7 are two class main channels.Here 0 degree, 90 degree, 180 degree and 270 degree contain
Justice can be determined according to the actual conditions of aircraft platform, for example, 0 degree of front for representing aircraft, 90 degree of left side sides for representing aircraft,
180 degree represents the rear of aircraft, 270 degree of right side sides for representing aircraft.
By taking 0 degree of main channel 4 as an example, which includes 120MHz bandstop filter 201,120MHz bandstop filter
201 output end is connect with the input terminal of frequency mixer 202, and the frequency mixer 202 in the present embodiment is active mixer, switch 203
Be single-pole double-throw switch (SPDT) with switch 206, the output end of frequency mixer 202 is connect with one end of switch 203, switch 203 it is another
End selectively with one of bandpass filter of 1030MHz bandpass filter 204 or 1090MHz bandpass filter 205
Input terminal connection, one end of switch 206 selectively with 1030MHz bandpass filter 204 or 1090MHz bandpass filter 205
One of bandpass filter output end connection, switch 206 the other end connection primary amplifier 207 input terminal, just
The output end of grade amplifier 207 is connect with the input terminal of the first bandpass filter 208, the output end of the first bandpass filter 208
It is connect with the input terminal of programmable attenuator 209, the input terminal of the output end connection driving amplifier 210 of programmable attenuator 209 drives
The output end of dynamic amplifier 210 is connect with one end of isolator 211, and the other end of isolator 211 is defeated with final amplifier 212
Enter end connection, the output end of final amplifier 212 is connected to circulator 213, and circulator 213 connects receiver 214 and 0 degree of antenna
215.Each circulator 213 can connect an individual receiver, or different circulators 213 are separately connected same receiver
Different port, the present embodiment uses latter connection type, and each circulator 213 is connected to receiver 214, and receiver 214 is set
It is equipped with multiple and different receiving ports, the circulator 213 in 0 degree of main channel 4 is connected to 0 degree of receiving port of receiver 214.Function
Rate wave detector 216 is used to detect the forward power and backward power of 0 degree 215 of antenna of emission port, and antenna detection device 217 is logical
Overvoltage variation judges 0 degree 215 of antenna of internal resistance and connection status.
The modulating part of 0 degree of main channel 4 mainly by 120MHz bandstop filter 201, frequency mixer 202, switch 203,
1030MHz bandpass filter 204,1090MHz bandpass filter 205, switch 206, primary amplifier 207, the first bandpass filtering
Device 208, programmable amplifier 209, driving amplifier 210, isolator 211 and final amplifier 212 form.Working frequency selection dress
It sets and is mainly made of switch 203,1030MHz bandpass filter 204,1090MHz bandpass filter 205 and switch 206,
1030MHz bandpass filter 204 and 1090MHz bandpass filter 205 respectively corresponded working frequency selection device two are defeated
Channel out.
Wherein, 0 degree of corresponding input signal in main channel 4 and local oscillation signal are sent to modulating part, are mixed through frequency mixer 202
Processing.The frequency of input signal is one of 80MHz or 140MHz, and the frequency of local oscillation signal is 1170MHz, through frequency mixer
The working frequency exported after 202 Frequency mixing processings is f1=1170-140=1030MHz or f2=1170-80=1090MHz, however
Inevitably there are the noises of other frequency components in input signal, therefore the output end of frequency mixer 202 also there is except corresponding work
The noise of other frequency components other than working frequency, when the working frequency of the output end of frequency mixer 202 is 1030MHz, switch
203 input terminals for being separately connected 1030MHz bandpass filter 204 with switch 206 and output end are thus by 1030MHz bandpass filtering
Device 204 is connected, and 1030MHz bandpass filter 204 allows 1030MHz frequency component to pass through while inhibiting other frequency components logical
It crosses；When the working frequency of the output end of frequency mixer 202 is 1090MHz, switch 203 and switch 206 are separately connected 1090MHz band
The input terminal and output end of bandpass filter 205 are to be connected 1090MHz bandpass filter 205,1090MHz bandpass filter
205 permission 1090MHz frequency components pass through while other frequency components being inhibited to pass through.The structure is effectively inhibiting relevant work frequency
In the case where frequency component other than rate, the hair of the signal of two kinds of different operating frequencies of 1030MHz and 1090MHz can adapt to
Penetrate so that 0 degree of main channel 4 can be realized TCAS inquiry transmitting, S mode response (A of response containing aviation management C mode) transmitting with
ADS-B emits three functions.
Input signal enters frequency mixer 202 through 120MHz bandstop filter 201, when there are the humorous of 120MHz in input signal
When wave, 120MHz bandstop filter 201 allows the frequency component in addition to 120MHz to pass through, thus by input signal
120MHz frequency component filters out.
Transmitter further includes first power splitter 301 and two the second power splitters 302, and two of the first power splitter 301
Output end is respectively connected to the input terminal of two the second power splitters 302, and two the second power splitters 302 are total to there are four output end, this
Four output ends are respectively connected to the input terminal of the frequency mixer of four main channels.In the present embodiment, frequency is the local oscillator of 1170MHz
Signal is provided by one of port of receiver 214, and local oscillation signal is divided into four tunnels through the first power splitter and the second power splitter, this
The input terminal of the frequency mixer 202 being wherein sent to all the way in 0 degree of main channel 4 in four road local oscillation signals.
By the signal of switch 206 successively through primary amplifier 207, the first bandpass filter 208, programmable attenuator 209
So that power is reached 40W with driving amplifier 210, after so that power is reached 800W through isolator 211 and final amplifier 212.Its
In, the first bandpass filter 208 allow by the frequency range of signal include all working in working frequency selection device
Frequency, specifically, the alternative working frequency of working frequency selection device in the present embodiment are 1030MHz and 1090MHz,
First bandpass filter 208 allow by signal frequency range be 0.92-1.23GHz, which includes 1030MHz
And 1090MHz.
The signal of the output end of final amplifier 212 is sent to the emitting portion transmitting of 0 degree of main channel 4,0 degree of main channel 4
Emitting portion be mainly made of circulator 213,0 degree 215 of antenna, power detector 216 and antenna detection device 217, wherein
Receiver internal signal treatment channel corresponding to 0 degree of receiving port of receiver 214 and component can be considered 0 degree of main channel 4
Emitting portion component part.The circulator 213 of 0 degree of main channel 4 receives the signal and biography of the output end of final amplifier 212
It send to 0 degree 215 of antenna, signal will lose Partial Power in the process, and the Partial Power of loss is received the corresponding of machine 214
Receiving port is received, and system identifies whether have signal to be sent to 0 degree 215 of antenna through circulator 213 from modulating part accordingly, when
When the correspondingly received port of receiver 214 receives the Partial Power of loss, illustrate that signal transmitting is normal.For example, final stage is put
The signal of the output end of big device 212 is 800W, and the power that 0 degree 215 of antenna of signal is sent to after circulator 213 is 700W,
The correspondingly received port that the 100W power of loss is received machine 214 receives.
By 0 degree 215 of antenna received external signal can also be sent to receiver by the circulator 213 of 0 degree of main channel 4
214 corresponding port, circulator 213 and receiver 214 of the external signal successively through 0 degree 215,0 degree main channel 4 of antenna it is corresponding
It is receiving channel that port, which is formed by signal transmission channel, which meets following require:
Receiving channel Insertion Loss :≤2.5dB；
Receiving channel isolation: >=20dB.The parameter refers to the ratio of Power leakage, such as the signal of 100W, leakage
Power is not greater than 1W.
Antenna detection device 217 provides a DC voltage, judges antenna internal resistance size, antenna internal resistance by voltage drop
Greatly, then pressure drop is big, and antenna internal resistance is small, then pressure drop is small, and voltage drop is not inconsistent with expected pressure drop, shows wrong antenna, no-voltage
Pressure drop then shows that the antenna of emitting portion is not connected.
90 degree of main channels 5 and 180 degree main channel 6 belong to a kind of main channel, the structure base of structure and 0 degree of main channel 4
This is consistent, the difference is that the port of antenna and receiver that corresponding circulator 213 is connected difference.90 degree of masters are logical
The circulator 213 in road 5 connects 90 degree of receiving ports of 90 degree 218 of antenna and receiver 214, the circulator of 180 degree main channel 6
The 180 degree receiving port of 213 connection antenna 180 degrees 219 and receiver 214.
270 degree of main channels 7 belong to two class main channels, with 0 degree of main channel 4 the difference is that, 270 degree of main channels 7
Including two emitting portions, corresponding two subchannels of two emitting portions, respectively 270 degree it is upper with 270 degree under, modulation portion sets up separately
There is high-power switching switch 221, modulating part is optionally connected to the two emitting portions by high-power switching switch 221
One of emitting portion.Specifically, one end of high-power switching switch 221 and the final amplifier in 270 degree of main channels 7
212 output end connection, the other end of high-power switching switch 221 are optionally connected to one of them of two emitting portions
The circulator 213 of emitting portion, the circulator 213 on 270 degree of subchannel connect 270 degree of antenna and go up 220A and receiver 214
270 degree are gone up receiving ports, and the circulator 213 under 270 degree of subchannel connects 270 degree of 270 degree of antenna lower 220B and receiver 214
Lower receiving port, 270 degree of antenna upper 220A and 270 degree of antenna lower 220B are provided with corresponding power detector 216 and antenna
Detection device 217.The signal of two emitting portions of 270 degree of main channels 7 moves towards and corresponding function refers to the hair of 0 degree of main channel 4
Penetrate part.
Transmitter in the present embodiment by triplet main channel and a two class main channels form 0 degree, 90 degree,
180 degree, 270 degree of upper and 270 degree of lower 5 transmission channels, each transmission channel are provided with TCAS inquiry transmitting, S mode response
(A of response containing aviation management C mode) transmitting and ADS-B emit three functions, can satisfy the multichannel transmitting of most of aircraft platforms
It is required that.Four main channels have corresponded to four main direction of the launch on aircraft platform.270 degree above lower by high-power with 270 degree
Switch the one of work of the selection of switch 221, is i.e. there are 4 transmission channels that can be in emission state simultaneously in 5 transmission channels.
As shown in Fig. 2, the transmitter setting of the present embodiment is there are four separate cavities 1, each separate cavities 1 arrange that a master is logical
Road is separated each main channel using separate cavities 1, and that realizes each main channel divides chamber to be isolated, and carries out closed work, to avoid logical
Interference between road.
The transmitter also has the function of switching network.
The present embodiment is using technologies such as modularization, miniaturization, solid state power amplifiers, in 285 × 188 × 28mm3It is realized in volume
Transmitter function, aviation management S mode (response containing aviation management A C mode) answering machine transmitter with aviation management TCAS inquiry subsystem
The design in 5 channels of function, ADS-B transmitter function, integration degree is high.The transmitter can above be mentioned in an Aerial Electronic Equipment
For the transmitting signal of multiple functions, the miniaturization for having effectively facilitated each subsystem of secondary radar integrates and avionics comprehensive.
The signal processing method of the transmitter of the present embodiment, any main channel are corresponding with input signal to be launched all the way,
Input signal and local oscillation signal are sent to the modulating part of main channel, and the modulated signal of modulating part through main channel passes through master
The emitting portion in channel emits.Into the modulating part of main channel two paths of signals be mixed in frequency mixer 202 it is a certain to export
Working frequency, the output signal of frequency mixer 202 are sent to working frequency selection device, make the corresponding output channel of the working frequency
Conducting, and other output channels are closed.
Specifically, the characteristic of the local oscillation signal in the present embodiment are as follows:
Local oscillator centre frequency: 1170MHz ± 7.9KHz；
Local oscillation power: 3 ± 2dBm；
Local oscillator harmonic wave and spurious reduction: >=50dBc；
The quantity of the main channel of the present embodiment is four, and each main channel corresponds to input signal to be launched all the way, input
Signal is intermediate-freuqncy signal, the characteristic of the intermediate-freuqncy signal of input are as follows:
Medium frequency amplitude: >=+7dBm；
IF frequency: 80MHz ± 992KHz, 140MHz ± 2.38KHz；
Four road emission medium-frequency signal amplitude consistency: ± 1dB；
Four road emission medium-frequency signal amplitudes adjust minimum step: 0.5dB；
The program-controlled response time :≤1.2 μ s.
The transmitter of the present embodiment can reach following index request under TCAS mode:
Working frequency: 1030MHz ± 0.01MHz；Output power: >=55dBm (intermediate-freuqncy signal input is+7dBm)；
Modulation system: ASK (amplitude-shift keying), PSK (phase-shift keying)；
Maximum duty cycle :≤1.3%；
Pulse characteristic is as follows under TCAS mode:
In width 0.8us, 1.6us, 16.25us, 30.25us of impulse amplitude 50%, error≤± 0.1 μ S；
Rise time :≤0.1uS；
Fall time :≤0.2uS；
Pulse spacing error :≤0.1uS；
Minimum pulse interval: 2uS；
Programed power control characteristic is as follows under TCAS mode:
Range: 0~26dB, 1dB stepping；
Relative error: ± 0.5dB；
Absolute error: ± 2dB.
The transmitter of the present embodiment under S mode response (A of response containing aviation management C mode) transmitting and ADS-B emission mode,
Following index can be reached:
Working frequency: 1090MHz ± 1MHz；
In the case where having upper and lower antenna, pulse power is exported: upper antenna: 53.8dBm ± 2dBm；Lower antenna: >=
56dBm；
Maximum duty cycle: 1.3%；
Pulse characteristic under S mode response (A of response containing aviation management C mode) transmitting and ADS-B emission mode is as follows:
Minimum pulse interval: 2uS；
In the width of impulse amplitude 50%: ± 0.05 μ S of 0.45 μ S；
Rise time :≤0.1uS；Fall time :≤0.2uS；
Port power when not emitting :≤- 66.6dBm (1090 ± 3MHz).
Frequency input signal in the present invention is not limited to 80MHz or 140MH, and the frequency of local oscillation signal is also not limited to
1170MHz, as long as required working frequency can be obtained after frequency mixer is handled.Input signal can be in other embodiments
For 81MHz or 141MHz, local oscillation signal can be 1171MHz, and frequency after mixed is 1171-81=1090MHz or 1171-
141=1030MHz.
Although by reference to preferred embodiment, invention has been described, the case where not departing from the scope of the present invention
Under, it can be carried out it is various improvement and can be with equivalent substitution of some or all of the technical features.Especially,
As long as logic or structural conflict is not present, items technical characteristic mentioned in the various embodiments can combine in any way
Come.The invention is not limited to specific embodiments disclosed herein, but all skills including falling within the scope of the appended claims
Art scheme.
Claims (10)
1. a kind of transmitter, which is characterized in that including main channel, the main channel includes modulating part and emitting portion；
The modulating part includes frequency mixer and working frequency selection device, the output end of the frequency mixer and the working frequency
The input terminal of selection device connects, and the working frequency selection device has multiple output channels, and each output channel is right respectively
A working frequency is answered, the one of output channel of the working frequency selection device selection, which is connected and closes other outputs, leads to
Road, the working frequency selection device select the corresponding working frequency of output channel of conducting for the work frequency of mixer output
Rate；
The emitting portion transmitting is sent to through the modulated signal of the modulating part.
2. transmitter according to claim 1, which is characterized in that the modulating part further includes 120MHz bandreject filtering
The output end of device, the 120MHz bandstop filter is connect with the input terminal of the frequency mixer.
3. transmitter according to claim 1, which is characterized in that the working frequency selection device includes 1030MHz band
Bandpass filter, 1090MHz bandpass filter and two single-pole double-throw switch (SPDT)s；
One end of one of single-pole double-throw switch (SPDT) is connected with the output end of the frequency mixer, the other end selectively with it is described
The input terminal of one of bandpass filter of 1030MHz bandpass filter or 1090MHz bandpass filter is connected；
One end of another single-pole double-throw switch (SPDT) selectively with the 1030MHz bandpass filter or 1090MHz bandpass filtering
The output end of one of bandpass filter of device is connected.
4. transmitter according to claim 1, which is characterized in that the modulating part further includes that sequentially connected primary is put
Big device, the first bandpass filter, programmable attenuator, driving amplifier, isolator, final amplifier；
The input terminal of the primary amplifier is connect with the output end of the working frequency selection device；
First bandpass filter allow by the frequency range of signal include all works in working frequency selection device
Working frequency.
5. transmitter according to claim 1, which is characterized in that the emitting portion includes circulator and antenna, described
Circulator is connect with antenna and receiver respectively, the loss of signal Partial Power transmitted through the circulator to the antenna,
The power of loss is received by the receiver；
The received external signal of antenna is sent to the receiver through the circulator.
6. transmitter according to claim 1, which is characterized in that any main channel is using a kind of main channel or two classes
One of type in both main channel types of main channel；
The quantity of the emitting portion of one kind main channel is one, and the modulating part is connect with the emitting portion；
The quantity of the emitting portion of two class main channel is two, and the modulating part is switched equipped with high-power switching, described
Modulating part is optionally connected to one of emitting portion of the two emitting portions by high-power switching switch.
7. the transmitter described in any one of according to claim 1, which is characterized in that the emitting portion includes antenna, power
Wave detector and antenna detection device；
The power detector is used to detect the forward power and backward power of the emission port of antenna；
The antenna detection device judges the internal resistance and connection status of respective antenna by voltage change.
8. transmitter described in any one of -7 according to claim 1, which is characterized in that the transmitter further includes one first
Power splitter and two the second power splitters, the quantity of the main channel are four；
First power splitter and the second power splitter are an input terminal and two output ends, and two of first power splitter
Output end is separately connected the input terminal of two second power splitters, and four output ends of two second power splitters connect respectively
It is connected to the input terminal of the frequency mixer of four main channels.
9. a kind of signal processing method of transmitter according to claim 1 to 8, which is characterized in that the hair
When penetrating machine transmitting signal, any main channel corresponds to input signal to be launched all the way, the input signal and local oscillation signal
It is sent to the modulating part, is emitted through the modulated signal of the modulating part by the emitting portion；
Two paths of signals into the modulating part is mixed to export a certain working frequency, the output letter of frequency mixer in frequency mixer
Number it is sent to working frequency selection device, makes the corresponding output channel conducting of the working frequency, and other output channels are closed.
10. signal processing method according to claim 9, which is characterized in that when transmitter receives signal, receiving channel is
The external signal received, which from antenna is transmitted to the circulator being connected with the antenna and is resent to receiver, is formed by signal
Transfer pipe；
Receiving channel meets following require:
Receiving channel Insertion Loss :≤2.5dB；
Receiving channel isolation: >=20dB.
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| CN201811331724.9A CN109462410A (en) | 2018-11-09 | 2018-11-09 | A kind of transmitter and its signal processing method |
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Citations (7)
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