CN110780267B - Self-checking method for receiving and transmitting channel of navigation management inquiry response simulator - Google Patents
Self-checking method for receiving and transmitting channel of navigation management inquiry response simulator Download PDFInfo
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- CN110780267B CN110780267B CN201911050615.4A CN201911050615A CN110780267B CN 110780267 B CN110780267 B CN 110780267B CN 201911050615 A CN201911050615 A CN 201911050615A CN 110780267 B CN110780267 B CN 110780267B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
Abstract
The invention discloses a self-checking method for a receiving and transmitting channel of an air traffic control inquiry response simulator, which respectively controls the working frequencies of a transmitter and a receiver through a signal processing module, and designs the channel of a radio-frequency signal of the transmitter into two switchable paths, wherein one path can be output to an antenna port through a front-end amplifier, and the other path can be output to a receiver module through a coupler. When self-checking starts, the signal processing module outputs an excitation pulse signal to the transmitter, the transmitter generates a radio frequency signal and outputs the radio frequency signal to the receiver through the circulator, the receiver obtains a baseband signal after frequency mixing demodulation and then transmits the baseband signal to the signal processing module, and the signal processing module judges whether the receiving and transmitting channel works normally according to the received baseband signal. Engineering practice proves that the detection method is accurate and effective, detection efficiency and reliability of self-checking of the navigation management inquiry response simulator are improved, and labor and material cost is saved.
Description
Technical Field
The invention belongs to the field of data transmission channel testing, and particularly relates to a self-checking method for a receiving and transmitting channel of an air traffic control inquiry response simulator.
Background
A Secondary radar (SSR) system comprises an interrogator and a transponder, wherein the interrogator of the Secondary radar system can transmit 1030MHZ interrogation signals and receive 1090MHZ response signals of an airborne transponder to acquire information such as position, height, flight number, identification code and the like of a target. The secondary radar system is widely applied to the field of traffic control in civil and military aviation.
The navigation management inquiry response simulator is special detection equipment for detecting whether the secondary radar system works normally or not, and can set the working mode of the navigation management inquiry response simulator to be an interrogator mode or a responder mode through mode configuration, so that the responder and the interrogator are respectively detected. Therefore, as a special detection device of the secondary radar system, firstly, it is necessary to ensure that the function of the device is normal, and when the navigation management inquiry response simulator has a fault, the fault information should be reported to a user. Of all the detection items, the detection of the receiving channel and the transmitting channel is most important. The secondary radar working frequency comprises 1030MHZ and 1090MHZ, a receiver of the interrogator receives the 1090MHZ response signal, and a transmitter transmits 1030MHZ interrogation signals; the receiver of the transponder receives 1030MHZ interrogation radio frequency signals and the transmitter transmits 1090MHZ reply signals. Due to the inconsistency of the operating frequencies of the transceiving channels, the existing navigation management inquiry response simulator cannot finish the detection of the transceiving channels by only depending on the receiver and the transmitter of the simulator no matter the existing navigation management inquiry response simulator works in an inquiry simulation state or a response simulation state, and the detection of the transceiving channels needs to be realized by an additional self-detection oscillation source or external detection equipment.
That is, the existing navigation management inquiry response simulator can be switched to an inquiry simulator and a response simulator by setting, and the receiving and transmitting channels of the existing navigation management inquiry response simulator can not work at the same frequency in the two working modes, so that the self-checking of the receiving and transmitting channels of the existing navigation management inquiry response simulator needs to be performed by external detection equipment or needs to add an additional self-checking oscillation source, the method usually needs to consume more time, manpower and material resources, and even needs to add additional hardware cost, and the detection efficiency of the navigation management inquiry response simulator is reduced.
Disclosure of Invention
The invention aims to: the invention provides a self-checking method for a transceiving channel of an aviation management inquiry response simulator, aiming at the problem that the self-checking of the transceiving channel of the existing aviation management inquiry response simulator is low in detection efficiency mainly through external detection equipment or through adding an additional self-checking oscillation source.
The purpose of the invention is realized by the following technical scheme:
a self-checking method for a transceiving channel of an air traffic control inquiry response simulator is characterized by at least comprising the following steps:
s1: generating a DPSK modulation signal machine receiving and sending channel control step, generating synchronous DPSK pulse modulation signals to be output to a transmitter, recording the number of generated pulses, controlling the transmitter and a receiver to work at the same frequency, and simultaneously controlling a transmitter switch circuit to be switched to a receiver channel;
s2: after receiving a DPSK pulse modulation signal, a transmitter generates a radio frequency signal which is modulated by a frequency source, and the radio frequency signal is output to a receiver channel through a preceding stage amplification circuit, a switching circuit and a coupler;
s3: a receiver frequency mixing, demodulation and demodulated signal output step, wherein after receiving the radio frequency signal, the receiver carries out frequency mixing and demodulation on the signal and outputs a demodulated signal;
s4: and a step of detecting, comparing and outputting a detection result of the demodulated signal, namely comparing the received DPSK demodulated signal with the recorded pulse number, judging that a receiving and transmitting channel is normal when the received pulse number is consistent with the recorded pulse number, judging that the receiving and transmitting channel is abnormal when the received pulse number is inconsistent with the recorded pulse number, and outputting a judgment result.
According to a preferred embodiment, the step S1 specifically includes the following steps:
s11: a DPSK modulation pulse signal and a transmitter gate control signal are generated by a signal processing module through a counter, the pulse width of the pulse is 0.25us, the number of the pulse is 10, and the pulse is uniformly distributed in the gate control signal with the length of 6 us;
s12: controlling the transmitter and the receiver to work at the same frequency, and simultaneously controlling the switch circuit of the transmitter to be switched to a channel of the receiver;
s13: the signal processing module records the number of output pulses and detects the number of pulses output by the receiver in real time.
According to a preferred embodiment, in step S12, the transmitter and the receiver are controlled to operate at frequencies 1030MHZ or 1090 MHZ.
According to a preferred embodiment, the DPSK signal in step S2 is generated by: the binary digital baseband signal is differentially encoded and then absolute phase modulated according to the differential code, thereby generating a differential phase shift keying signal.
According to a preferred embodiment, the step S3 specifically includes: s31: after receiving the radio frequency signal, the receiver carries out amplitude limiting, filtering, frequency mixing, demodulation and differential removal on the signal to obtain a DPSK demodulation signal; s32: and outputting the DPSK baseband signal to a signal processing module.
According to a preferred embodiment, said step S4 includes at least:
s41: the signal processing module detects the rising edge of the DPSK pulse signal based on the received DPSK demodulation signal, and stops detecting after the AM gating signal finishes for 2 us;
s42: and comparing the pulse number with the recorded pulse number, judging that the transceiving channel is normal when the received pulse number is consistent with the recorded pulse number, and judging that the transceiving channel has a fault when the received pulse number is inconsistent with the recorded pulse number.
According to a preferred embodiment, said step S4 further comprises: s43: and the signal processing module stores the current detection result and transmits the current detection result to a display control interface of the navigation management inquiry response simulator.
The main scheme and the further selection schemes can be freely combined to form a plurality of schemes which are all adopted and claimed by the invention; in the invention, the selection (each non-conflict selection) and other selections can be freely combined. The skilled person in the art can understand that there are many combinations, which are all the technical solutions to be protected by the present invention, according to the prior art and the common general knowledge after understanding the scheme of the present invention, and the technical solutions are not exhaustive herein.
The invention has the beneficial effects that:
1. aiming at the defect that the self-checking function of the conventional navigation management inquiry response simulator is not convenient and quick enough, the invention provides a method for self-checking a receiving and transmitting channel by utilizing a self transmitter, a receiver and a signal processing module, so that the time, the labor, the material resources and the hardware cost are saved, the self-checking of the navigation management inquiry response simulator is efficient and quick, and the detection efficiency of the navigation management inquiry response simulator is improved;
2. aiming at the self-checking function of the navigation management inquiry response simulator, a set of strict and complete self-checking signal processing method is provided, and the high reliability of detection is ensured, so that the correctness and the effectiveness of the navigation management inquiry response simulator serving as a special detection device are ensured.
3. The self-checking method of the navigation management inquiry response simulator provided by the invention is based on an automatic detection principle, and has reference significance for the improvement of the self-checking function of the domestic navigation management inquiry response simulator.
Drawings
FIG. 1 is a schematic flow chart illustrating the steps of the self-test method of the present invention;
fig. 2 is a schematic diagram of the constituent structure of the transmitter of the present invention;
FIG. 3 is a schematic diagram of DPSK signal modulation in step 2 according to the present invention;
FIG. 4 is a schematic diagram of the component architecture of the receiver of the present invention;
fig. 5 is a schematic diagram of DPSK signal demodulation performed in step 3 of the method of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that, in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, it should be noted that, in the present invention, if the specific structures, connection relationships, position relationships, power source relationships, and the like are not written in particular, the structures, connection relationships, position relationships, power source relationships, and the like related to the present invention can be known by those skilled in the art without creative work on the basis of the prior art.
Example 1:
referring to fig. 1, a self-test method for a transceiving channel of an airline management inquiry response simulator is disclosed, and the self-test method at least comprises the following steps.
Step S1: generating a DPSK modulation signal transceiver channel control step. And generating synchronous DPSK pulse modulation signals and outputting the signals to a transmitter, recording the number of generated pulses, controlling the transmitter and a receiver to work at the same frequency, and simultaneously controlling a switch circuit of the transmitter to be switched to a channel of the receiver.
Preferably, the step S1 specifically includes the following steps:
s11: a DPSK modulation pulse signal and a transmitter gate control signal are generated by a signal processing module through a counter, the pulse width of the pulse is 0.25us, the number of the pulse is 10, and the pulse is uniformly distributed in the gate control signal with the length of 6 us;
s12: controlling the transmitter and the receiver to work at the same frequency, and simultaneously controlling the switch circuit of the transmitter to be switched to a channel of the receiver;
s13: the signal processing module records the number of output pulses and detects the number of pulses output by the receiver in real time.
Further, in step S12, the transmitter and the receiver are controlled to operate at the frequency 1030MHZ or 1090 MHZ.
Step S2: and a step of DPSK signal modulation amplification and output. The schematic block diagram of the transmitter is shown in fig. 2. After receiving the DPSK pulse modulation signal, the transmitter generates a radio frequency signal which is subjected to modulation through a frequency source, and the radio frequency signal is output to a receiver channel through a pre-stage amplification circuit, a switching circuit and a coupler.
The working mode of the transmitter is divided into two states of self-checking transmission and normal transmission, and the radio frequency signal is determined to be transmitted to the receiver or output to an antenna port by controlling the switch circuit.
DPSK (differential phase shift keying) is a technique for transferring digital information by using the relative phase change of carriers of adjacent symbols, and is also called relative phase shift keying. Suppose that
For the carrier phase difference of the current code element and the previous code element, a digital information sum can be defined
The relationship between is
The DPSK signal is generated in the following manner: differential encoding of binary digital baseband signals, i.e. conversion of the absolute code of the digital information sequence into a differential code, followed by subsequent encodingAbsolute phase modulation is performed to generate a differential phase shift keyed signal.
Preferably, the DPSK signal modulation principle is shown in fig. 3, and the modulation of the absolute code s (t) into the carrier signal F is realized by the principle diagram shown in fig. 3DPSK(t)。
Step S3: and the receiver mixes frequency, demodulates and outputs the demodulated signal. The schematic block diagram of the receiver is shown in fig. 4. After receiving the radio frequency signal, the receiver performs frequency mixing and demodulation on the signal and outputs a demodulated signal.
Preferably, the step S3 specifically includes: s31: after receiving the radio frequency signal, the receiver carries out amplitude limiting, filtering, frequency mixing, demodulation and differential removal on the signal to obtain a DPSK demodulation signal. S32: and outputting the DPSK baseband signal to a signal processing module.
The demodulation block diagram is shown in fig. 5. The demodulation of DPSK signal adopts differential coherent demodulation method, the demodulation method is to delay the received DPSK signal by one code element interval TBAnd then multiplied by the DPSK signal itself. The multiplier can play a role of phase comparison, the multiplication result reflects the phase difference of the front code element and the rear code element, and the original digital information can be recovered by sampling judgment after low-pass filtering.
Step S4: and detecting, comparing and outputting a detection result by the demodulation signal. And finishing comparison with the recorded pulse number based on the received DPSK demodulation signal, judging that the transceiving channel is normal when the received pulse number is consistent with the recorded pulse number, judging that the transceiving channel is abnormal when the received pulse number is inconsistent with the recorded pulse number, and finishing output of a judgment result.
Preferably, the step S4 includes at least:
s41: and the signal processing module detects the rising edge of the DPSK pulse signal based on the received DPSK demodulation signal, and stops detecting after the AM gating signal is ended for 2 us.
S42: and comparing the pulse number with the recorded pulse number, judging that the transceiving channel is normal when the received pulse number is consistent with the recorded pulse number, and judging that the transceiving channel has a fault when the received pulse number is inconsistent with the recorded pulse number.
S43: and the signal processing module stores the current detection result and transmits the current detection result to a display control interface of the navigation management inquiry response simulator.
The self-checking method for the receiving and transmitting channel of the navigation management inquiry response simulator provided by the invention is characterized in that the signal processing module is used for respectively controlling the working frequencies of a transmitter and a receiver, the channel of the radio-frequency signal of the transmitter is designed into two switchable paths, one path can be output to an antenna port through a front-end amplifier, and the other path can be output to the receiver module through a coupler. When self-checking starts, the signal processing module outputs an excitation pulse signal to the transmitter, the transmitter generates a radio frequency signal and outputs the radio frequency signal to the receiver through the circulator, the receiver obtains a baseband signal after frequency mixing demodulation and then transmits the baseband signal to the signal processing module, and the signal processing module judges whether the receiving and transmitting channel works normally according to the received baseband signal.
Engineering practice proves that the detection method is accurate and effective, detection efficiency and reliability of self-checking of the navigation management inquiry response simulator are improved, and labor and material cost is saved. Meanwhile, the self-checking method of the receiving and sending module of the navigation management inquiry response simulator provided by the invention has a certain reference function for the improvement of the self-checking function of the domestic navigation management inquiry response simulator.
The foregoing basic embodiments of the invention and their various further alternatives can be freely combined to form multiple embodiments, all of which are contemplated and claimed herein. In the scheme of the invention, each selection example can be combined with any other basic example and selection example at will. Numerous combinations will be known to those skilled in the art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A self-checking method for a transceiving channel of an air traffic control inquiry response simulator is characterized by at least comprising the following steps:
s1: generating a DPSK modulation signal machine receiving and sending channel control step, generating synchronous DPSK pulse modulation signals to be output to a transmitter, recording the number of generated pulses, controlling the transmitter and a receiver to work at the same frequency, and simultaneously controlling a transmitter switch circuit to be switched to a receiver channel;
s2: after receiving the DPSK pulse modulation signal, the transmitter generates a radio frequency signal which is modulated by a frequency source, and the radio frequency signal is output to a receiver channel through a pre-stage amplification circuit, a switching circuit and a coupler;
s3: a receiver frequency mixing, demodulation and demodulated signal output step, wherein after receiving the radio frequency signal, the receiver carries out frequency mixing and demodulation on the signal and outputs a demodulated signal;
s4: and a step of detecting, comparing and outputting a detection result of the demodulated signal, namely comparing the received DPSK demodulated signal with the recorded pulse number, judging that a receiving and transmitting channel is normal when the received pulse number is consistent with the recorded pulse number, judging that the receiving and transmitting channel is abnormal when the received pulse number is inconsistent with the recorded pulse number, and outputting a judgment result.
2. The self-checking method for the transceiving channel of the navigation management inquiry response simulator according to claim 1, wherein the step S1 specifically comprises the following steps:
s11: a DPSK modulation pulse signal and a transmitter gate control signal are generated by a signal processing module through a counter, the pulse width of the pulse is 0.25us, the number of the pulse is 10, and the pulse is uniformly distributed in the gate control signal with the length of 6 us;
s12: controlling the transmitter and the receiver to work at the same frequency, and simultaneously controlling the switch circuit of the transmitter to be switched to a channel of the receiver;
s13: the signal processing module records the number of output pulses and detects the number of pulses output by the receiver in real time.
3. The self-checking method for the transceiving channel of the navigation management inquiry response simulator according to claim 2, wherein in step S12, the transmitter and the receiver are controlled to operate at a frequency of 1030MHZ or 1090 MHZ.
4. The self-checking method for the transceiving channel of the navigation management inquiry response simulator according to claim 1, wherein the DPSK signal in step S2 is generated in a manner that: the binary digital baseband signal is differentially encoded and then absolute phase modulated according to the differential code, thereby generating a differential phase shift keying signal.
5. The self-checking method for the transceiving channel of the navigation management inquiry response simulator according to claim 1, wherein the step S3 specifically comprises:
s31: after receiving the radio frequency signal, the receiver carries out amplitude limiting, filtering, frequency mixing, demodulation and differential removal on the signal to obtain a DPSK demodulation signal;
s32: and outputting the DPSK baseband signal to a signal processing module.
6. The self-checking method for the transceiving channel of the navigation management inquiry response simulator according to claim 1, wherein the step S4 at least comprises:
s41: the signal processing module detects the rising edge of the DPSK pulse signal based on the received DPSK demodulation signal, and stops detecting after the AM gating signal finishes for 2 us;
s42: and comparing the pulse number with the recorded pulse number, judging that the transceiving channel is normal when the received pulse number is consistent with the recorded pulse number, and judging that the transceiving channel has a fault when the received pulse number is inconsistent with the recorded pulse number.
7. The self-checking method for the transceiving channel of the navigation management inquiry response simulator according to claim 6, wherein the step S4 further comprises:
s43: and the signal processing module stores the current detection result and transmits the current detection result to a display control interface of the navigation management inquiry response simulator.
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| CN112558025B (en) * | 2020-11-30 | 2022-09-13 | 四川九洲空管科技有限责任公司 | Secondary radar inquiry and response function detection equipment |
| CN113206697B (en) * | 2021-03-19 | 2023-04-18 | 中国电子科技集团公司第二十九研究所 | Broadband radio frequency receiving and processing system device and self-checking method thereof |
| CN115085748A (en) * | 2022-08-22 | 2022-09-20 | 四川九洲空管科技有限责任公司 | Method, device and equipment for resisting asynchronous interference |
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