CN104820209B - A kind of interrogator transmitter and its method for inquiring of civil aviaton's multipoint positioning - Google Patents

Abstract

The present invention provides an inquiry transmitter and an inquiry method thereof for multi-point positioning for civil aviation. The inquiry transmitter includes: an antenna module; a host connected to the antenna module; wherein, the host is provided with a transmitting extension, a terminal processing extension and a power supply extension, and The transmitting extension is provided with a frequency source module, a modulation module, and a power amplifier module that provide carrier signals; the power amplifier module is connected to the antenna module, and can exchange signals with the terminal processing extension in two directions; the modulation module can receive control signals from the terminal processing extension; the frequency source module can The voltage signal from the power supply extension is received; the terminal processing extension is provided with inquiry parameters; and the inquiry parameters can be obtained through the transmitting extension to obtain an inquiry signal of a predetermined format, and then transmit the inquiry signal of a predetermined format through an omnidirectional antenna. Therefore, the above-mentioned interrogation transmitter enables the multilateration system to fully monitor the targets in the coverage area, and send out interrogation signals in a timely and accurate manner.

Description

An interrogation transmitter and interrogation method for civil aviation multilateration

technical field

The invention relates to the technical field of civil aviation, in particular to an interrogation transmitter for civil aviation multipoint positioning and an interrogation method thereof.

Background technique

With the increasing air traffic flow, the traditional radar technology will not be able to fully support the implementation of advanced air traffic management concepts, so the multipoint positioning system (MSS, full name multilater--ationsurveillance system) is proposed for the airport's existing The supplement and enhancement of the air traffic control radar system, MSS includes 2 sets of subsystems, the multipoint positioning surface monitoring system (MSS-A) and the multipoint positioning approach monitoring system (MSS-PRM), one set is used to monitor the surface targets, Another set is used for surveillance of air targets in the terminal approach area. The essence of the multilateration scene surveillance system is to provide a smooth transition for the implementation of ADS-B by using the same ground receiving station structure as ADS-B (full name Automatic De--pendent Surveillance-Broadcast), and at the same time, through improved surveillance technology Provide effective surveillance services to air traffic control. Different from primary and secondary radar positioning principles, multipoint positioning monitoring technology is based on signal time difference of arrival (TDOA, full name Time difference of arrival) to calculate the position of the aircraft. A set of multilateration monitoring system includes multiple ground receiving stations, which are used to receive the response signals emitted by the target, such as A/C mode, S mode, extended S mode signal, etc. When the same group of signals is received by receiving antennas located at different locations on the ground, because the distance between the target and each receiving antenna is different, the time for the signal to reach each antenna is also slightly different. These differences are the signal time difference of arrival (TDOA); on this basis, with the help of a specific algorithm, the position of the aircraft will be accurately calculated. The multilateration monitoring system consists of several signal receivers, interrogation signal transmitters and reference transponders distributed around the monitoring area, and a group of central processing server (CPS). When receiving the S mode or A/C mode interrogation signal from the secondary radar or other interrogation equipment, the S mode or A/C mode transponder installed on the aircraft or ground moving target (vehicle) will automatically send the corresponding S mode mode or A/C mode response signal.

For example, a technical solution using a multilaterate positioning system is disclosed in the Chinese patent application number CN201310285465.1, which discloses an airborne collision avoidance and ground proximity warning monitoring method, which is characterized in that, It includes the following steps: 1) The system host broadcasts the status information of the machine through the four-channel L-band antenna, and at the same time monitors the response signal sent by the body equipped with the S-mode or A/C-mode transponder in the surrounding airspace, and sends an inquiry signal to detect the surrounding area. The body with A/C mode transponder installed in the airspace; 2) information interaction with the target body through the radio frequency module and baseband module, tracking the target body with S and A/C mode transponder installed, and the data processing module establishes Track; 3) Based on information such as own aircraft, terrain threat, and target aircraft track, calculate the threat of own aircraft hitting the ground and air collision, and output appropriate sound and video avoidance advice information when threats exist, prompting the pilot to take evasive actions.

Another technology utilizing the multipoint positioning system, such as the Chinese patent application with the Chinese patent application number CN201310711878.1, discloses a S-mode transponder with a broadcast automatic monitoring capability of 1090 MHz extended message, which has the ability to A/C/S mode query response function and 1090ESADS-B function, the transponder includes: antenna, used to receive 1030MHz and 1090MHz signals and send 1090MHz signals; receiving module, connected to the antenna, used to transmit the received 1030MHz signal through the antenna Limiting, decluttering and amplification with 1090MHz signal; RF sampling module, connected with the receiving module, used to sample the signal processed by the receiving module and convert it into a digital signal; signal processing module, connected with the RF sampling module , used to identify and decode the signal sampled by the RF sampling module to identify the received signal as a 1030MHz A/C/S inquiry signal or a 1090ESADS-BIN signal, and send the decoded signal to the data processing module; the data processing module is connected with the signal processing module and the external equipment in the aircraft, and is used to receive the decoded signal and process the decoded signal, wherein, when the decoded signal received by the data processing module is 1030MHz A/C/S inquiry signal, then send the response signal with the A/C/S inquiry signal to the signal processing module; when the received signal is 1090ESADS-BIN signal, send the signal to the external device for display The signal; the signal processing module is also used to encode the response signal sent by the data processing module and/or actively generate the 1090ESADS-BOUT encoded signal according to the data sent by the data processing module and according to the 1090ESADS-BOUT timing; and the transmitting module is used for The signal encoded by the signal processing module is transmitted.

In the process of realizing the present invention, the inventor found that among the technical solutions of the multilaterate positioning system in the prior art, there is no technical solution capable of sending out the inquiry signal accurately and in time.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the present invention provides a civil aviation multilateration interrogation transmitter and an interrogation method that can improve the interrogation technical solution in the multilateration system. The technical scheme provided by the invention is:

On the one hand, there is provided an interrogation transmitter for civil aviation multilateration, characterized in that it includes:

An antenna module, the antenna module includes an omnidirectional antenna and a GPS sub-module;

a host connected to the antenna module;

Wherein, the host is provided with a transmitting extension, a terminal processing extension and a power supply extension, and the transmitting extension is provided with a frequency source module providing a carrier signal, a modulation module connected to the frequency source module, and a power amplifier module connected to the modulation module;

The power amplifier module is connected to the omnidirectional antenna, and can exchange signals with the terminal processing extension in two directions;

The modulation module can receive a control signal from the terminal processing extension;

The frequency source module can receive a voltage signal from the power extension;

Inquiry parameters are set in the terminal processing extension; and the inquiry parameters can obtain an inquiry signal in a predetermined format through the transmitting extension, and then transmit the inquiry signal in a predetermined format through an omnidirectional antenna.

Therefore, the above-mentioned multilateration interrogation transmitter for civil aviation enables the multilateration system to monitor all targets within the coverage area, and send out interrogation signals in a timely and accurate manner.

Preferably, the frequency source module can transmit a lock detection signal to the terminal processing extension.

Preferably, the modulation module can receive PTT signals, ADK and/or DPSK signals from the terminal processing extension.

Preferably, the terminal processing extension can transmit a power control signal to the power amplifier module, and receive a standing wave detection signal from the power amplifier module.

Therefore, the terminal processing extension and the transmitting extension can better exchange information, so that the terminal processing extension can transmit the inquiry code to the transmitting extension, and the transmitting extension can accurately transmit a predetermined inquiry signal.

Preferably, the terminal processing extension is also provided with a port connected to a network card and a test port; and the terminal processing extension is connected to the GPS sub-module. Therefore, the terminal processing extension can receive more control signals.

Preferably, the terminal processing extension is provided with an FPGA unit and an ARM unit, the FPGA unit exchanges information with the transmitting extension, and the ARM unit exchanges information with the GPS sub-module and the port connected to the network card and the test port information, and the FPGA unit and the ARM unit are connected through an EMC interface.

Preferably, the ARM unit information processing module can accept external control signals, transmit control signals, transmission mode signals, and transmission power signals to the FPGA unit, and the FPGA unit converts signals from the ARM unit into transmission extensions capable of transmitting The identified signal; and the FPGA unit can also feed back the working status information of the transmitting extension to the outside through the ARM unit.

Therefore, the terminal processing extension can have better information and parameter collection functions through the ARM unit, and can also better exchange information with the transmitting extension through the FPGA unit.

Preferably, the host of the inquiry transmitter is connected to an external command center, and the command center can control the operating parameters of the host, and the parameters include working mode, inquiry mode, number of inquiries and aircraft address. As a result, there is better control over how the interrogation transmitter works from the command center.

Preferably, the power amplifier module is provided with a push stage power amplifier sub-module, a final stage power amplifier sub-module, and a program-controlled attenuator; and the program-controlled attenuator can perform multi-level attenuation control. Therefore, a more stable transmission signal can be obtained.

On the other hand, the present invention also provides an interrogation method of a multilateration interrogation transmitter for civil aviation, characterized in that the multilateration interrogation transmitter for civil aviation is any one of the interrogation transmitters described above, and the Inquiry methods include:

A. Start up and initialize settings;

B. The host performs a self-check to detect whether the host can work normally and whether the communication interface connected to the host can work normally;

C. Set the parameters of the terminal processing extension according to the state of the host, and whether the host receives an inquiry command from the external control center; if yes, transmit the inquiry command through the transmitting extension and the antenna module.

Preferably, the host self-inspection method in step B includes returning a power self-inspection signal to the terminal processing extension through the power supply extension; returning its static self-inspection parameters to the terminal processing extension through the transmitting extension; The frequency source module returns a locking indication signal to the terminal processing extension; and the power control parameter is set to the power amplifier module through the terminal processing extension.

Therefore, it can be ensured that each module of the interrogation transmitter is in a normal state, and it is ensured that the interrogation transmitter sends out the interrogation signal accurately and in time.

Preferably, the terminal processing extension is connected with at least two transmitting extensions, and the parameters of the terminal processing extension in the step C are completed by modifying the parameters of the FPGA unit in it, and the transmitting extension that the FPGA unit can receive Working state: when the modified parameter of the FPGA unit corresponds to an inquiry signal command, the FPGA unit can select a non-busy transmitting extension to inquire according to the working status information fed back by each transmitting extension. Therefore, it can be ensured that the query signal can be transmitted quickly while saving hardware resources.

Preferably, the FPGA unit may provide an all-call mode inquiry and a selection mode inquiry to the transmitting extension, and the all-call mode inquiry is used for a new object to be interrogated, and the selection mode inquiry is used for a captured interrogation object.

Therefore, the interrogation transmitter can interrogate the signal of a predetermined format in the monitoring area, for example, all S-mode and A/C-mode transponders, so that the system can fully monitor the targets in the coverage area and send out the interrogation signal in a timely and accurate manner; Furthermore, the inquiry transmitter can receive the inquiry management instruction issued by the command center, transmit the inquiry signal according to the intention of the command center, and respond in a corresponding format when the aircraft in the coverage area receives the inquiry signal.

Description of drawings

FIG. 1 is a structural block diagram of a multilateration interrogation transmitter for civil aviation provided by Embodiment 1 of the present invention;

FIG. 2 is a structural block diagram of a host in a multilateration interrogation transmitter for civil aviation provided by Embodiment 1 of the present invention;

3 is a flow chart of signal transmission in a multilateration interrogation transmitter for civil aviation provided by Embodiment 1 of the present invention;

FIG. 4 is a flowchart of an interrogation method for an interrogation transmitter for civil aviation multilateration provided by Embodiment 1 of the present invention;

Fig. 5 is a mechanism block diagram of a terminal processing extension in a civil aviation multilateration interrogation transmitter provided by Embodiment 2 of the present invention;

FIG. 6 is a flow chart of an interrogation method for an interrogation transmitter for civil aviation multilateration provided by Embodiment 2 of the present invention;

FIG. 7 is a flow chart of an interrogation method for an interrogation transmitter for civil aviation multilateration provided by Embodiment 3 of the present invention.

detailed description

The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that these specific descriptions are only for those of ordinary skill in the art to understand the present invention more easily and clearly, rather than limiting interpretation of the present invention.

Embodiment one

As shown in Fig. 1 and Fig. 2, a civil aviation multilateration interrogation transmitter 1 provided by Embodiment 1 includes: an antenna module, which includes an omnidirectional antenna 6 and a GPS submodule 7, preferably an omnidirectional antenna 6 is an omnidirectional antenna capable of transmitting 1030MHz, which is shown as 360° uniform radiation on the horizontal pattern, which is commonly referred to as non-directional. This omnidirectional antenna 6 has the smaller the lobe width, the greater the gain, The application has the characteristics of short distance, large coverage and low cost; and the GPS sub-module 7 is provided with a GPS antenna. The inquiry transmitter 1 also includes a host 2 connected to the antenna module, wherein the omnidirectional antenna 6 and the GPS sub-module 7 are connected to the host through high-frequency cables 8 and 9 respectively. As shown in FIG. 2 , the host 2 is provided with a transmitter extension 22 , a terminal processing extension 23 and a power extension 21 , and the power extension 21 can receive power from the first power supply 4 and the second power supply 5 . Preferably, the first power supply 4 is 220V alternating current, the second power supply 5 is a direct current of 24V or 48V, and the second power supply 5 can be used as a backup power supply to supply power to the entire inquiry transmitter 1, and the power extension 21 can connect the power supply one 4 and/or Or the voltage of the power supply 25 is converted into various DC voltages such as +5V, +12V, +35V, +50V, among which the transmitting extension 22 can receive these four different DC voltages, while the terminal processing extension 23 only accepts +5V the DC voltage. Preferably, the transmitting extension 22 is provided with a frequency source module 22c providing a carrier signal, a modulation module 22b connected to the frequency source module 22c, and a power amplifier module 22a connected to the modulation module 22b; the power amplifier module 22a is connected to the omnidirectional antenna 6, and can Two-way signal exchange with the terminal processing extension 23; the modulation module 22b can receive control signals from the terminal processing extension 23. Preferably, the modulation module 22b can receive ASK (amplitude keying) signals, DPSK (binary differential phase keying) signals, and PTT (push-to-talk) signals from the terminal processing extension 23; the frequency source module 22c can receive signals from the power extension voltage signal, and can provide a frequency of predetermined size; the terminal processing extension 23 is provided with an inquiry parameter; and the inquiry parameter can obtain an inquiry signal of a predetermined format through the transmitting extension 22, and then transmit the inquiry signal of a predetermined format through the omnidirectional antenna 6 .

Therefore, the above civil aviation multilateration interrogation transmitter 1 enables the multilateration system to monitor all targets within the coverage area, and send out interrogation signals in a timely and accurate manner. Then the ground receiving station in the multilateration system receives and obtains more information about the target to be queried.

Preferably, the frequency source module 22c can transmit a lock detection signal to the terminal processing extension, so that the terminal processing extension 23 can better transmit the corresponding ASK signal, DPSK signal and PTT signal to the modulation module 22b, so that the inquiry can be accurately The command is sent out.

Preferably, the terminal processing extension 23 can provide a power control signal to the power amplifier module, and the power amplifier module 22a can feed back a standing wave detection signal to the terminal processing extension 23, and the feedback standing wave is used to detect the position information of the detection target.

Therefore, the terminal processing extension and the transmitting extension can better exchange information, so that the terminal processing extension can transmit the inquiry code to the transmitting extension, and the transmitting extension can accurately transmit a predetermined inquiry signal.

Preferably, the terminal processing extension is also provided with ports 11, 12 and a test port 13 connected to the network card, wherein the ports 11, 12 can receive external control signals, and the test port 13 can be used as a standby port; and the terminal processing extension 23 is connected to the receiving port. GPS submodule connection for GPS antenna information. Therefore, it is possible to apply more control signals and obtain more signals to the extension terminal processing unit 23 .

As shown in Figure 1, preferably, the host computer 2 of inquiry transmitter 1 is connected with external command center 3, and command center 3 can control the operating parameters of host computer 2, and these parameters include but not limited to: working mode, inquiry mode, inquiry times and aircraft addresses. As a result, there is better control over how the interrogation transmitter works from the command center.

Preferably, the power amplifier module 22a is provided with a booster stage power amplifier sub-module, a final stage power amplifier sub-module, and a program-controlled attenuator; and the program-controlled attenuator can perform multi-level attenuation control. Therefore, a more stable transmission signal can be obtained.

As shown in Figure 3, the terminal processing extension 23 in a civil aviation multipoint positioning inquiry transmitter provided by the present invention can receive an external control signal, such as an inquiry signal from the command center 3 and/or the GPS submodule, and then pass the terminal The interface management module 23b in the processing extension 23 organizes these information, and then distinguishes the transmission control signal, transmission mode setting signal, and transmission power control signal therein; and transmits these signals to the transmission extension 22 through the signal processing module 23a; and transmits The extension 22 may also feed back the working state information of the extension to the interface management module 23b through the signal processing module 23a.

As shown in Figure 4, Embodiment 1 also provides an inquiry method of a multilateration interrogation transmitter for civil aviation, the inquiry method comprising:

S0, start, start the above-mentioned inquiry transmitter (start);

S1, initialization setting, inquire about the initialization operation of the transmitter;

S2. Inquiring the host in the transmitter to perform a self-check to detect whether the host can work normally, and whether the communication interface connected to the host can work normally;

S3, setting the parameters of the terminal processing extension according to the state of the host;

S4. Whether the host has received the inquiry command from the external control center; if yes, execute S5, if not, execute S6; wherein, S5 is the processing of the communication command, that is, the inquiry command is transmitted through the transmitting extension and the antenna module; S6 is to continue detecting query processing signals;

S7. After the processing of the communication command is completed, check again whether the state of the host has changed; if yes, execute step S3; if not, execute step S4.

Preferably, the self-checking method of the host in step S2 includes returning a power self-test signal to the terminal processing extension through the power supply extension; returning its static self-inspection parameters to the terminal processing extension through the transmitting extension; returning a locking instruction to the terminal processing extension through the frequency source module Signal; set power control parameters to the power amplifier module through the terminal processing extension.

Thus, interrogation transmitters can interrogate signals of a predetermined format within the surveillance area, these signals include interrogation of different transponders, aircraft flight, altitude, etc., for example, all Mode S and Mode A/C transponders, allowing the system to cover Targets in the area are fully monitored, and the inquiry signal is sent out in a timely and accurate manner; further, by receiving the inquiry management command issued by the central processing station, the inquiry signal can be transmitted according to the intention of the central station, and when the aircraft in the coverage area receives the inquiry signal Make a response in the appropriate format.

Embodiment two

The interrogation transmitter 1 of multipoint positioning provided by embodiment two is also provided with an antenna module, and a host 2 connected to the antenna module, a power supply extension 21, and a transmission extension 22, which also includes the frequency for providing carrier signals A source module 22c, a modulation module 22b, and a power amplifier module 22a. The difference is that the terminal processing extension 23 provided in the second embodiment is provided with an FPGA (field programmable gate array) unit 231 and an ARM unit 232, the FPGA unit 231 exchanges information with the transmitting extension 22, and the ARM unit 232 communicates with the GPS sub-module 14 and with the The ports 11 , 12 connected by the network card and the test port 13 exchange information, and the FPGA unit 231 and the ARM unit 232 are connected through an EMC (Electromagnetic Compatibility) interface.

Preferably, the ARM unit 232 information processing module can accept external control signals, and transmit control signals, transmission mode signals, and transmission power signals to the FPGA unit 231, and the FPGA unit 231 converts signals from the ARM unit 232 into signals that can be recognized by the transmitting extension. signal; and the FPGA unit 231 can also feed back the working status information of the transmitting extension to the outside through the ARM unit 232 .

Therefore, the terminal processing extension can have better information and parameter collection functions through the ARM unit, and can also better exchange information with the transmitting extension through the FPGA unit; especially the FPGA unit 231 has good expansion and data processing capabilities, It can make the computing power of the terminal processing extension better.

As shown in Figure 6, preferably, the terminal processing extension is connected with at least two transmitting extensions, and the parameters of the terminal processing extension in step S3 are completed by modifying the parameters of the FPGA unit in it, and the transmitting extension that the FPGA unit can receive Working status; when the modified parameters of the FPGA unit correspond to an inquiry signal command, the FPGA unit can select a non-busy transmitting extension to inquire according to the working status information fed back by each transmitting extension; therefore, the inquiry signal can be sent out more quickly .

Embodiment three

The multilateration interrogation transmitters for civil aviation provided in Embodiment 3 and Embodiment 2 have the same terminal processing extension 23 , that is, FPGA (Field Programmable Gate Array) unit 231 and ARM unit 232 are also provided. The difference is that, in the inquiry method of the interrogator provided in Embodiment 3, the FPGA unit 231 can provide all-call mode inquiry and selection mode (also called selective call mode) inquiry to the transmitting extension, and the all-call mode inquiry is used for newly emerging object to be interrogated, while select mode interrogation is used for captured interrogation objects.

Specifically, as shown in FIG. 7, an inquiry method of an inquiry transmitter in this embodiment includes:

S01, start; S02, initialization setting; S03, the host computer performs self-test; S04, set the parameters of the FPGA unit; S05 query command; S06, communication command processing; among them,

After the communication command is processed, it is also provided with: S08, the determination of the inquiry signal format, according to the inquiry signal format, select the all-call module or the selection mode; and for the inquiry of the all-call mode, randomly designate the inquiry transmitter wherein to perform inquiry transmission, for In the selection mode, according to the position of the target distance from each interrogation transmitter, the nearest interrogation transmitter is selected for interrogation transmission. Therefore, in the case of satisfying the accurate positioning function of the multilaterate positioning system, it can be more conducive to the allocation of resources of the interrogation transmitter.

Finally, it should be noted that the above description is only the best embodiment of the present invention, and does not limit the present invention in any form. Any person familiar with the art, without departing from the scope of the technical solution of the present invention, can make many possible changes and simple replacements to the technical solution of the present invention by using the methods and technical contents disclosed above, all of which belong to the technical solution of the present invention Scope of program protection.

Claims (9)

1. A multipoint located interrogation transmitter for civil aviation comprising:

the antenna module comprises an omnidirectional antenna and a GPS (global positioning system) sub-module;

the host is connected with an external command center, and the command center can control working parameters of the host, wherein the parameters comprise a working mode, a query mode, query times and an airplane address; the omnidirectional antenna and the GPS sub-module are respectively connected with the host through high-frequency cables;

the host is provided with a transmitting extension set, a terminal processing extension set and a power supply extension set, and the terminal processing extension set is connected with at least two transmitting extension sets; the transmitting extension set is provided with a frequency source module for providing carrier signals, a modulation module connected with the frequency source module and a power amplifier module connected with the modulation module;

the power amplifier module is connected with the omnidirectional antenna and can process extension two-way exchange signals with the terminal;

the modulation module can receive a control signal from the terminal processing extension;

the frequency source module can receive a voltage signal from the power extension;

inquiry parameters are arranged in the terminal processing extension; the inquiry parameters can obtain inquiry signals with a preset format through the transmitting extension set, and then the inquiry signals with the preset format are transmitted through the omnidirectional antenna;

the terminal processing extension is also provided with a port connected with the network card and a test port; the terminal processing extension is connected with the GPS submodule;

the terminal processing extension is provided with an FPGA unit and an ARM unit, the FPGA unit exchanges information with the transmitting extension, the ARM unit exchanges information with the GPS sub-module and the port connected with the network card and the test port, and the FPGA unit is connected with the ARM unit through an EMC interface;

the ARM unit information processing module can receive a control signal from the outside and transmit a control signal, a transmission mode signal and a transmission power signal to the FPGA unit, and the FPGA unit converts the signal from the ARM unit into a signal which can be identified by a transmission extension; the FPGA unit can also feed back the working state information of the transmitting extension to the outside through the ARM unit;

and the FPGA unit receives the working state of the transmitting extension set, and selects the transmitting extension set which is not busy to inquire according to the working state information fed back by each transmitting extension set.

2. The multi-point localized interrogation transmitter of claim 1, wherein said frequency source module is capable of transmitting a lock detect signal to a terminal processing extension.

3. The multipoint-located interrogation transmitter for civil aviation of claim 1, wherein said modulation module is capable of receiving PTT signals, ADK and/or DPSK signals from said terminal processing extensions.

4. The multi-point positioning interrogation transmitter for civil aviation of claim 1, wherein said terminal processing extension is capable of transmitting a power control signal to said power amplifier module and receiving a standing wave detection signal from said power amplifier module.

5. The multipoint-positioned interrogation transmitter for civil aviation of claim 1, wherein said power amplifier module is provided with a push-stage power amplifier submodule, a final-stage power amplifier submodule, a programmable attenuator; and the programmable attenuator can perform multi-gear attenuation control.

6. An interrogation method of a multipoint positioning interrogation transmitter for civil aviation, wherein the multipoint positioning interrogation transmitter for civil aviation is the interrogation transmitter of any one of claims 1 to 5, the interrogation method comprising:

step A, starting up and initializing;

b, the host carries out self-checking to detect whether the host can work normally or not and whether a communication interface connected with the host can work normally or not;

step C, setting parameters of the terminal processing extension set according to the state of the host, and whether the host receives an inquiry command of an external control center; if yes, the inquiry command is transmitted through the transmitting extension and the antenna module.

7. The interrogation method of a multi-point positioning interrogation transmitter for civil aviation as claimed in claim 6, wherein said method of host self-test in step B comprises returning a power self-test signal to said terminal processing extension through said power extension; returning the static self-checking parameters to the terminal processing extension through the transmitting extension; returning a locking indication signal to the terminal processing extension set through the frequency source module; and setting power control parameters to the power amplifier module through the terminal processing extension.

8. The interrogation method of the multi-point positioning interrogation transmitter for civil aviation as claimed in claim 6, wherein said terminal processing extension is connected with at least two transmitting extensions, the parameters of the terminal processing extension in said step C are accomplished by modifying the parameters of the FPGA unit therein, and the FPGA unit can receive the operating state of the transmitting extension; when the parameters modified by the FPGA unit correspond to an inquiry signal command, the FPGA unit can select the transmitting extension set which is not busy to inquire according to the working state information fed back by each transmitting extension set.

9. The interrogation method of a multipoint positioning interrogation transmitter for civil aviation as claimed in claim 8, wherein said FPGA unit is capable of providing a full call mode interrogation for newly emerging objects to be interrogated and a selective mode interrogation for captured objects to be interrogated to said transmitting extension.