CN109557516B - Method for quickly generating multi-target space signals - Google Patents
Method for quickly generating multi-target space signals Download PDFInfo
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- CN109557516B CN109557516B CN201811469523.5A CN201811469523A CN109557516B CN 109557516 B CN109557516 B CN 109557516B CN 201811469523 A CN201811469523 A CN 201811469523A CN 109557516 B CN109557516 B CN 109557516B
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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
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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
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
Abstract
The invention discloses a method for quickly generating multi-target space signals. The method can provide a signal source close to a real environment for the multipoint positioning system to be verified by simulating the multi-target motion track, thereby effectively improving the accuracy and robustness of the verification result of the overall performance of the multipoint positioning system and having positive promotion effect on the further development of the multipoint positioning technology.
Description
Technical Field
The invention relates to the technical field of simulation test of a multipoint positioning system, in particular to a method for quickly generating a multi-target space signal.
Background
With the rapid development of aviation traffic, how to effectively monitor and identify increasingly dense moving targets such as airplanes and vehicles in a complex airport environment in real time is a main problem of improving the operation efficiency and safe scheduling of the airport. Compared with the traditional scene surveillance radar, the airport multipoint positioning system has the advantages of high positioning precision, good identification performance, low false alarm rate detection, all-weather guard and the like, and becomes an important solution for monitoring and identifying the intensive moving targets of all large busy airport scenes in real time. Because the airport multipoint positioning system utilizes the existing secondary radar and ADS-B answering machine, the positioning is carried out by depending on the time difference of the target transmitting signal reaching different ground receiving stations and the known positions of all stations, and other electronic equipment is not required to be additionally installed, the multipoint positioning system is now a research hotspot of domestic and foreign scientific research institutions.
The overall performance of the multi-point positioning system is determined by the site layout of the multi-point positioning receiving stations constituting the multi-point positioning system, the positioning accuracy of the multi-point positioning system, and other factors. Conventional methods for fast signal generation can produce a multi-target signal, but the signal is a single-path signal. The signal received by the multipoint positioning system is a multipath space signal, which is positioned by the time difference of the target transmitting signal reaching different ground receiving stations and the known positions of the stations. Thus, signals generated using conventional signal fast generation methods cannot be used to verify the overall performance of a multipoint positioning system. Moreover, the conventional method for quickly generating signals cannot take into account the influence of factors such as the spatial position of the signals, the moving track of the target, and the channel control parameters of a specific geographic environment, and therefore, the method is generally used for the detection and identification of the signals.
At present, the overall performance of a multi-point positioning system is usually verified by adopting an external field experiment mode. However, in the case where the multi-point positioning system to be verified is in the development stage, this approach will greatly increase the cost of the test project and the difficulty of debugging. It follows that there is currently no good way to verify the overall performance of a multilateration system.
In order to solve the technical problem, the invention provides a method for rapidly generating multi-target spatial signals, and the multi-target spatial signals generated by the method are used for verifying a multi-point positioning system.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: there is currently no good way to verify the overall performance of a multi-point positioning system.
In order to solve the above technical problem, the present invention provides a method for rapidly generating multi-target spatial signals, where the multi-target spatial signals are used for verifying a multi-point positioning system, and the method includes:
setting the number and type of targets, the time, number and type of signals transmitted by each track point of the motion track of each target, the number of multipoint positioning receiving stations corresponding to a multipoint positioning system to be verified and the motion track of each multipoint positioning receiving station, wherein the motion track of each target and the motion track of each multipoint positioning receiving station are set on the basis of an electronic map;
sequencing the time of transmitting signals of all targets at each track point of the respective motion tracks;
simultaneously advancing each target and each multi-point positioning receiving station to a track point according to the respective track;
the following operations are performed for each propulsion action:
sequentially calculating the distances between each target and each multipoint positioning receiving station according to the time sequence according to the sequencing result of the time of the track point transmitting signals of each target arriving under the action of the propelling action;
according to the distance between each target and each multipoint positioning receiving station, obtaining an intermediate frequency signal corresponding to a signal transmitted to each multipoint positioning receiving station by each target at a track point reached by the propelling action;
carrying out up-conversion processing on intermediate frequency signals corresponding to the multipoint positioning receiving stations to obtain radio frequency signals corresponding to the intermediate frequency signals;
and transmitting the radio frequency signal to a multipoint positioning system to be verified.
In a preferred embodiment of the present invention, sequentially calculating the distances between each target and each multipoint positioning receiving station according to the time sequence based on the sequencing result of the time of the track point transmitting signal reached by each target under the action of the propelling action, includes:
according to the sequencing result of the time of the track point transmitting signals reached by the targets under the action of the propelling action, sequentially acquiring the positions of the track points reached by the targets under the action of the propelling action and the positions of the track points reached by the multipoint positioning receiving stations under the action of the propelling action according to the time sequence;
and calculating the distance between each target and each multi-point positioning receiving station according to the position of the track point reached by each target under the action of the propelling action and the position of the track point reached by each multi-point positioning receiving station under the action of the propelling action.
In a preferred embodiment of the present invention, obtaining an intermediate frequency signal corresponding to a signal transmitted to each multipoint positioning receiving station at a track point where each target arrives under the action of a propulsion action according to a distance between each target and each multipoint positioning receiving station includes:
according to the distance between each target and each multipoint positioning receiving station, obtaining a signal space path attenuation parameter and a signal delay parameter corresponding to a signal transmitted to each multipoint positioning receiving station at a track point reached by each target under the action of propulsion;
and modulating the signals according to signal space path attenuation parameters and signal delay parameters corresponding to the signals transmitted to the multipoint positioning receiving stations by the track points reached by the targets under the action of the propelling action to obtain intermediate frequency signals corresponding to the signals transmitted to the multipoint positioning receiving stations by the track points reached by the targets under the action of the propelling action.
In a preferred embodiment of the present invention, obtaining an intermediate frequency signal corresponding to a signal transmitted to each multipoint positioning receiving station at a track point where each target arrives under the action of a propulsion action according to a distance between each target and each multipoint positioning receiving station includes:
according to the distance between each target and each multipoint positioning receiving station, obtaining a signal space path attenuation parameter and a signal delay parameter corresponding to a signal transmitted to each multipoint positioning receiving station at a track point reached by each target under the action of propulsion;
and modulating the signals according to signal space path attenuation parameters and signal delay parameters corresponding to the signals transmitted to the multipoint positioning receiving stations by the track points reached by the targets under the action of the propelling action and channel control parameters of a preset geographic environment to obtain intermediate frequency signals corresponding to the signals transmitted to the multipoint positioning receiving stations by the track points reached by the targets under the action of the propelling action.
In a preferred embodiment of the invention, it is determined whether intermediate frequency signals corresponding to the same multipoint positioning receiving station overlap, based on signal delay parameters corresponding to signals transmitted to the same multipoint positioning receiving station at the track point reached by each target under the action of the propelling action.
In a preferred embodiment of the present invention, when the signal delay parameters corresponding to the signals transmitted to the same multipoint positioning receiving station at the track point reached by each target under the action of the propulsion action are not in the same period, the intermediate frequency signals corresponding to the same multipoint positioning receiving station are the intermediate frequency signals corresponding to the signals transmitted to the same multipoint positioning receiving station at the track point reached by each target under the action of the propulsion action;
when the signal delay parameters corresponding to the signals transmitted to the same multipoint positioning receiving station at the track point reached by each target under the action of the propelling action are in the same period, the intermediate frequency signals corresponding to the same multipoint positioning receiving station are synthesized to obtain the signals corresponding to the signals transmitted to the same multipoint positioning receiving station at the track point reached by each target under the action of the propelling action.
In a preferred embodiment of the present invention, the method further comprises: and transmitting the intermediate frequency signals corresponding to the multipoint positioning receiving stations to the buffers corresponding to the multipoint positioning receiving stations one by one.
In a preferred embodiment of the invention, each target transmits only one signal at each track point in its path of motion.
In a preferred embodiment of the present invention, the signal comprises: one of an AC mode interrogation reply signal, an S mode interrogation reply signal, an ADS-B signal, and a DME interrogation reply signal.
In a preferred embodiment of the present invention, the multilateration receiving station is a fixed multilateration receiving station or a mobile multilateration receiving station.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
by applying the method for rapidly generating the multi-target space signal provided by the embodiment of the invention, a signal source close to a real environment can be provided for the multipoint positioning system to be verified by simulating the motion track of multiple targets, so that the accuracy and robustness of the verification result of the overall performance of the multipoint positioning system are effectively improved, and the method has a positive promoting effect on the further development of the multipoint positioning technology.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flowchart of a method for rapidly generating a multi-target spatial signal according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exemplary simulation scenario of the present invention;
FIG. 3 is a detailed flowchart of step S104 in FIG. 1;
fig. 4 is a detailed flowchart of step S105 of fig. 1 without considering the channel control parameters of the geographical environment;
fig. 5 is a detailed flowchart of step S105 of fig. 1 in consideration of the channel control parameters of the geographic environment;
fig. 6 is an exemplary schematic diagram of a specific operation procedure of steps S106 to S107 of fig. 1.
Detailed Description
The following detailed description will be given with reference to the accompanying drawings and examples to explain how to apply the technical means to solve the technical problems and to achieve the technical effects. It should be noted that, as long as there is no conflict, the embodiments and the features in the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
In order to solve the technical problem that a method for well verifying the overall performance of a multipoint positioning system is lacked in the prior art, the embodiment of the invention provides a method for quickly generating multi-target spatial signals, and the multi-target spatial signals generated by the method are used for verifying the multipoint positioning system.
Fig. 1 is a detailed flowchart of a method for rapidly generating a multi-target spatial signal according to an embodiment of the present invention.
As shown in fig. 1, the method for rapidly generating a multi-target spatial signal according to the embodiment of the present invention mainly includes the following steps S101 to S107.
In step S101, the number and type of objects and the motion track of each object are set, the time, number and type of signals transmitted by each object at each track point of the motion track of each object, and the number of multipoint positioning receiving stations and the motion track of each multipoint positioning receiving station corresponding to the multipoint positioning system to be verified are set, wherein the motion track of each object and the motion track of each multipoint positioning receiving station are set based on an electronic map.
Specifically, the number and the type of the targets and the motion tracks of the targets are set according to actual requirements or technical index verification requirements, and the time, the number and the type of the signals transmitted by the targets at each track point of the motion tracks are set. In the present embodiment, the object type is one of a ground object and an aerial object, and a motion track is set individually for each object, and the time, number, and type of the transmission of the signal by each object at each track point of its motion track. When the motion track of each target is set, the starting point and the end point of each target are known, so that the motion track of each target can be formed only by setting one intermediate point and connecting the starting point, the intermediate point and the end point through a straight line or a curve (comprising a sine curve, an arc curve and the like). The time at which each object transmits a signal at each track point of its moving track is different.
Since the motion trajectory of each object can be formed only from three points, i.e., the start point, the middle point, and the end point of each object, the motion trajectories of the objects are different for the same object if the middle points are different. However, this has no effect on the present invention.
Preferably, the signal transmitted by each target at each track point of its motion track comprises: one of the AC mode interrogation reply signal, the S mode interrogation reply signal, the ADS-B signal, and the DME interrogation reply signal, and can be extended according to actual requirements or technical index verification requirements.
And setting the number of multipoint positioning receiving stations corresponding to the multipoint positioning system to be verified and the motion track of each multipoint positioning receiving station according to the structural characteristics of the multipoint positioning system to be verified. Typically, the number of multilars is set to be between 3 and 5, one radio frequency channel for each multilar. Wherein the motion track of each target and the motion track of each multipoint positioning receiving station are set based on an electronic map.
In a preferred embodiment of the present invention, each of the receiving stations is set as a fixed receiving station according to longitude, latitude and altitude information of the receiving station. Or, each multi-point positioning receiving station is arranged on a moving target such as an airplane, a vehicle, a ship and the like, and at this time, the position of each multi-point positioning receiving station moves along with the movement of the moving target.
FIG. 2 is a schematic diagram of an exemplary simulation scenario of the present invention. In fig. 2, reference numerals 1, 2, 3, 4 denote respective targets, in this example, the target type is an aerial target. Reference numeral A, B, C, D, E denotes respective multilateration receiving stations, which in this example are fixed multilateration receiving stations. The dashed arrows indicate the motion trajectory of each object, and the solid arrows indicate the signals transmitted by each object to each multilateration receiver station.
In step S102, the times at which all targets transmit signals at each track point of their respective motion tracks are sequenced.
In step S103, the targets and the multipoint positioning receiving stations are simultaneously advanced by one track point along their respective tracks. Each target transmits only one signal at each track point of its motion track, and the signal types may vary sequentially, either equally or periodically.
It should be noted that the number of tracks included in the motion track of each target is not necessarily the same. After the track point of a certain target is forwards pushed to the end point of the motion track, when the next track point is forwards pushed, the target automatically disappears because the target cannot be continuously forwards pushed, and at the moment, other targets can be continuously forwards pushed. For example, assume that the motion track of object 1 has 4 track points and the motion track of object 2 has 3 track points. When object 1 and object 2 are simultaneously advanced to the respective 3 rd track point, object 2 has reached the end of its path of motion. After the target 1 and the target 2 perform corresponding operations at the 3 rd track points, the target 2 automatically disappears because the target cannot be continuously pushed forward to the next track point, and at this time, the target 1 only needs to be continuously pushed forward to the 4 th track point. At this 4 th track point, only target 1 needs to continue to perform the corresponding operation, while target 2 does not perform any operation.
However, after a certain multi-point positioning receiving station advances to the end point of the motion track, when the next track point is advanced, the multi-point positioning receiving station only needs to be kept at the end point of the motion track, and signals transmitted by all targets are continuously received at the point. That is, it is considered that the multipoint positioning reception station repeatedly advances to the same point, and at this time, the interpolation in the interpolation estimation is 0. By the arrangement, the static and dynamic application requirements can be met simultaneously, so that the method has general universality.
The following operations are performed for each propulsion action in step S103:
in step S104, the distances between the respective targets and the respective multipoint positioning receiving stations are sequentially calculated in chronological order based on the result of the ranking of the times at which the signals are transmitted from the track points reached by the respective targets by the propulsion operation. The specific process is shown in fig. 3.
In step S1041, according to the result of the sorting of the times of the track point transmission signals reached by the targets under the action of the propulsion action, the positions of the track points reached by the targets under the action of the propulsion action and the positions of the track points reached by the multipoint positioning receiving stations under the action of the propulsion action are sequentially acquired according to the time sequence.
In step S1042, the distance between each target and each multipoint positioning receiving station is calculated based on the position of the course point reached by each target under the propulsion action and the position of the course point reached by each multipoint positioning receiving station under the propulsion action.
In step S105, an intermediate frequency signal corresponding to a signal transmitted to each of the multipoint positioning receiving stations at the track point where each target arrives by the propulsion operation is obtained based on the distance between each target and each of the multipoint positioning receiving stations.
Specifically, the specific procedure of this step without considering the channel control parameters of the geographical environment is as shown in fig. 4.
In step S1051, a spatial attenuation formula is used to obtain signal spatial path attenuation parameters and signal delay parameters corresponding to signals transmitted to the multipoint positioning receiving stations at the track point where each target arrives under the propulsion action, according to the distance between each target and each multipoint positioning receiving station. Since the specific process of calculating the signal space path attenuation parameter and the signal delay parameter corresponding to the signal transmitted to each multipoint positioning receiving station at the track point reached by each target under the action of the propulsion action by using the space attenuation formula is well known by those skilled in the art, it is not described herein again.
In step S1052, the signals are modulated according to the signal space path attenuation parameter and the signal delay parameter corresponding to the signals transmitted to the multipoint positioning receiving stations at the track point reached by each target under the action of the propulsion action, so as to obtain intermediate frequency signals corresponding to the signals transmitted to the multipoint positioning receiving stations at the track point reached by each target under the action of the propulsion action. Since the specific process of modulating the signal to be transmitted to each multipoint positioning receiving station by using the signal space path attenuation parameter and the signal delay parameter corresponding to the signal at the track point reached by each target under the action of the propelling action is well known to those skilled in the art, the detailed description thereof is omitted here.
The specific procedure of this step in consideration of the channel control parameters of the geographical environment is shown in fig. 5.
In step S1051', a spatial attenuation formula is used to obtain signal spatial path attenuation parameters and signal delay parameters corresponding to signals transmitted to the multipoint positioning receiving stations at the track points where the targets arrive under the propulsion action, according to the distances between the targets and the multipoint positioning receiving stations. Since the specific process of calculating the signal space path attenuation parameter and the signal delay parameter corresponding to the signal transmitted to each multipoint positioning receiving station at the track point reached by each target under the action of the propulsion action by using the space attenuation formula is well known by those skilled in the art, it is not described herein again.
In step S1052', the signal is modulated according to the signal space path attenuation parameter and the signal delay parameter corresponding to the signal transmitted to each multipoint positioning receiving station at the track point reached by each target under the action of the propulsion action, and the channel control parameter of the preset geographic environment, so as to obtain an intermediate frequency signal corresponding to the signal transmitted to each multipoint positioning receiving station at the track point reached by each target under the action of the propulsion action. Wherein the geographic environment includes: mountainous areas, plains, sea surfaces, etc. The geographic environment is different, and the parameters such as the channel attenuation rate, the channel attenuation depth and the like corresponding to the geographic environment are different.
Specifically, first, the signals transmitted to the multipoint positioning receiving stations at the track points reached by the targets under the action of the propelling action are modulated into corresponding intermediate frequency signals by using the signal space path attenuation parameters and the signal delay parameters corresponding to the signals. Then, the amplitude of the intermediate frequency signal is controlled by using the channel control parameter of the preset geographical environment. Since the above modulation process is well known to those skilled in the art, it will not be described herein.
It should be noted that the if signal is a non-ideal if signal in a geographical environment.
In this embodiment, the intermediate frequency signal is modulated by using the channel control parameter of the preset geographic environment, so that the present invention can provide a signal source closer to a real environment for the multipoint positioning system to be verified.
In step S106, the intermediate frequency signals corresponding to the respective multilateration receiving stations are up-converted to obtain radio frequency signals corresponding to the intermediate frequency signals.
Specifically, whether intermediate frequency signals corresponding to the same receiving station are overlapped is determined according to signal delay parameters corresponding to signals transmitted to the same multipoint positioning receiving station at a track point reached by each target under the action of the propelling action.
When the signal delay parameters corresponding to the signals transmitted to the same multipoint positioning receiving station at the track points reached by the targets under the action of the propelling action are not in the same period, the intermediate frequency signals corresponding to the same multipoint positioning receiving station are the intermediate frequency signals corresponding to the signals transmitted to the same multipoint positioning receiving station at the track points reached by the targets under the action of the propelling action. In this case, the intermediate frequency signals corresponding to the respective multipoint positioning receiving stations are up-converted to obtain radio frequency signals corresponding to the intermediate frequency signals.
When the signal delay parameters corresponding to the signals transmitted to the same multipoint positioning receiving station at the track point reached by each target under the action of the propelling action are in the same period, the intermediate frequency signals corresponding to the same multipoint positioning receiving station are obtained by synthesizing the intermediate frequency signals corresponding to the signals transmitted to the same multipoint positioning receiving station at the track point reached by each target under the action of the propelling action. In this case, the intermediate frequency signals corresponding to the respective multipoint positioning receiving stations are up-converted to obtain radio frequency signals corresponding to the intermediate frequency signals.
In a preferred embodiment of the present invention, the method further comprises: and transmitting the intermediate frequency signals corresponding to the multipoint positioning receiving stations to the buffers corresponding to the multipoint positioning receiving stations one by one.
Furthermore, a timer is respectively arranged on each buffer, and the timer is used for controlling the transmitting action of the intermediate frequency signals stored in the buffer. When the signal delay parameters corresponding to the signals transmitted to the same multipoint positioning receiving station at the track point reached by each target under the action of the propelling action are not in the same period, the timing time length of each timer is the signal delay parameters corresponding to the signals transmitted to the multipoint positioning receiving stations at the track point reached by each target under the action of the propelling action. When the signal delay parameters corresponding to the signals transmitted to the same multipoint positioning receiving station at the track point reached by each target under the action of the propelling action are in the same period, the timing time length of the same timer is the signal delay parameters corresponding to the signals transmitted to the multipoint positioning receiving station corresponding to the timer at the track point reached by each target under the action of the propelling action. That is, when there is an overlap between intermediate frequency signals corresponding to the same multilateration receiving station, if there are N targets, the number of timing time lengths of the timer corresponding to the multilateration receiving station is N.
After the setting of the timing time lengths of all the timers is completed, the timers are started by the synchronous clock in a unified mode. Each timer starts to count time step by step from 0. When each timer counts each timing time length, each timer controls the intermediate frequency signal which is stored in the corresponding buffer and corresponds to each timing time length to be emitted. The transmitted intermediate frequency signal is converted into a corresponding radio frequency signal after up-conversion processing. Since the specific process of performing the up-conversion process on the intermediate frequency signal is well known to those skilled in the art, it is not described herein again.
Preferably, the functions of each buffer and each timer are realized by the FPGA through coding. The running clock frequency of the FPGA is 400MHz, the precision of the timer is 2.5ns, and the maximum time error index is far superior to the maximum time error index of the International Civil Aviation Organization (ICAO) of 25 ns. By the arrangement, high-precision control of signal delay can be realized.
In step S107, the radio frequency signal in step S106 is transmitted to the multipoint positioning system to be verified.
Fig. 6 is an exemplary diagram illustrating a specific operation procedure of step S106 to step S107. In fig. 6, since the multipoint positioning system to be authenticated includes 5 multipoint positioning receiving stations, 5 buffers, 5 timers and 5 radio frequency channels are provided.
After the operation corresponding to the current propelling action is executed, each target and each multipoint positioning receiving station are simultaneously propelled forward by one track point according to the respective track, and the steps S104 to S107 are repeatedly executed. The above steps are repeated until all the targets advance to the completion at all the track points of the motion tracks.
In order to facilitate understanding of the present invention, the following detailed description will be made of the technical solutions of the present invention by way of examples.
In step S101, according to the actual demand or the technical index verification demand, the number of targets is set to 2, the type of the targets is set to be an aerial target, and the motion track of each target is set. The number of the signals transmitted by each target at each track point of the moving track is set to be 1, and the time and the type of the signals transmitted by each target at each track point of the moving track are set.
According to the structural characteristics of the multipoint positioning system to be verified, the number of the multipoint positioning receiving stations is set to be 3, the number corresponds to the multipoint positioning system to be verified, and the motion tracks of the multipoint positioning receiving stations are set according to the multipoint positioning system to be verified. Wherein the motion track of each target and the motion track of each multipoint positioning receiving station are set based on an electronic map.
In step S102, the times at which all targets transmit signals at each track point of their respective motion tracks are sequenced.
In step S103, the targets and the multipoint positioning receiving stations are simultaneously advanced by one track point along their respective tracks.
The following operations are performed for each propulsion action in step S103:
in step S104, the distances between the respective targets and the respective multipoint positioning receiving stations are sequentially calculated in chronological order based on the result of the ranking of the times at which the waypoint transmit signals have arrived by the respective targets under the action of the propulsion action. Here, it is assumed that the time T1 at which the course point reached by the target 1 transmits a signal under the influence of the propulsive action precedes the time T2 at which the course point reached by the target 2 transmits a signal under the influence of the propulsive action.
In this case, first, the distance between the object 1 and each of the multipoint positioning reception stations is calculated. Specifically, in step S1041, the position of the course point reached by the target 1 under the action of the propelling action and the positions of the course points reached by the respective multipoint positioning reception stations under the action of the propelling action are acquired. In step S1042, the distance between the target 1 and each of the multipoint positioning receiving stations is calculated based on the position of the course point reached by the target 1 under the propulsion action and the position of the course point reached by each of the multipoint positioning receiving stations under the propulsion action. Then, the distances between the target 2 and the multipoint positioning receiving stations are calculated by the method. Here, for convenience of description, it is assumed that the distance between the target 1 and the multilateration receiving station 1 is S1', the distance between the target 1 and the multilateration receiving station 2 is S1 ", and the distance between the target 1 and the multilateration receiving station 3 is S1". The distance between the target 2 and the multipoint positioning receiving station 1 is S2', the distance between the target 2 and the multipoint positioning receiving station 2 is S2 ", and the distance between the target 2 and the multipoint positioning receiving station 3 is S2".
In step S105, an intermediate frequency signal corresponding to a signal transmitted to each of the multipoint positioning receiving stations at the track point where each target arrives by the propulsion operation is obtained based on the distance between each target and each of the multipoint positioning receiving stations.
Specifically, the specific procedure of this step without considering the channel control parameters of the geographical environment is as follows:
in step S1051, a signal space path attenuation parameter X1 ' and a signal delay parameter Y1 ' corresponding to the signal 1 transmitted to the multipoint positioning receiving station 1 at the track point where the target 1 arrives by the propulsion operation are obtained by using a space attenuation formula based on the distance S1 ' between the target 1 and the multipoint positioning receiving station 1.
Similarly, one can obtain: a signal space path attenuation parameter X1 'and a signal delay parameter Y1' corresponding to the signal 1 transmitted to the multipoint positioning receiving station 2 at the track point reached by the target 1 under the action of the propelling action, and a signal space path attenuation parameter X1 'and a signal delay parameter Y1' corresponding to the signal 1 transmitted to the multipoint positioning receiving station 3 at the track point reached by the target 1 under the action of the propelling action. A signal space path attenuation parameter X2 'and a signal delay parameter Y2' corresponding to the signal 2 transmitted to the multipoint positioning receiving station 1 at the track point reached by the target 2 under the effect of the propelling action, a signal space path attenuation parameter X2 "and a signal delay parameter Y2" corresponding to the signal 2 transmitted to the multipoint positioning receiving station 2 at the track point reached by the target 2 under the effect of the propelling action, and a signal space path attenuation parameter X2 '"and a signal delay parameter Y2'" corresponding to the signal 2 transmitted to the multipoint positioning receiving station 3 at the track point reached by the target 2 under the effect of the propelling action.
In step S1052, the signal 1 is modulated according to the signal space path attenuation parameter X1 ' and the signal delay parameter Y1 ' corresponding to the signal 1 transmitted to the multipoint positioning receiving station 1 at the track point where the target 1 arrives by the propulsion operation, and the intermediate frequency signal Z1 ' corresponding to the signal 1 is obtained.
Similarly, one can obtain: an intermediate frequency signal Z1 "corresponding to the signal 1 transmitted to the multipoint positioning receiving station 2 at the track point reached by the target 1 under the effect of the propelling movement, and an intermediate frequency signal Z1'" corresponding to the signal 1 transmitted to the multipoint positioning receiving station 3 at the track point reached by the target 1 under the effect of the propelling movement. An intermediate frequency signal Z2 ' corresponding to the signal 2 transmitted to the multipoint positioning receiving station 1 at the track point reached by the target 2 under the effect of the propelling action, an intermediate frequency signal Z2 ' corresponding to the signal 2 transmitted to the multipoint positioning receiving station 2 at the track point reached by the target 2 under the effect of the propelling action, and an intermediate frequency signal Z2 "' corresponding to the signal 2 transmitted to the multipoint positioning receiving station 3 at the track point reached by the target 2 under the effect of the propelling action.
The specific procedure of this step, taking into account the channel control parameters of the geographical environment, is as follows:
in step S1051 ', a signal space path attenuation parameter X1 ' and a signal delay parameter Y1 ' corresponding to the signal 1 transmitted to the multipoint positioning receiving station 1 at the track point where the target 1 arrives under the propulsion action are obtained by using a space attenuation formula according to the distance between the target 1 and the multipoint positioning receiving station 1.
Similarly, one can obtain: a signal space path attenuation parameter X1 ″ and a signal delay parameter Y1 ″ corresponding to the signal 1 transmitted to the multipoint positioning receiving station 2 at the track point reached by the target 1 under the effect of the propelling action, and a signal space path attenuation parameter X1 ″ and a signal delay parameter Y1 ″ corresponding to the signal 1 transmitted to the multipoint positioning receiving station 3 at the track point reached by the target 1 under the effect of the propelling action. A signal space path attenuation parameter X2 'and a signal delay parameter Y2' corresponding to the signal 2 transmitted to the multipoint positioning receiving station 1 at the track point reached by the target 2 under the action of the propelling action, a signal space path attenuation parameter X2 "and a signal delay parameter Y2" corresponding to the signal 2 transmitted to the multipoint positioning receiving station 2 at the track point reached by the target 2 under the action of the propelling action, and a signal space path attenuation parameter X2 '"and a signal delay parameter Y2'" corresponding to the signal 2 transmitted to the multipoint positioning receiving station 3 at the track point reached by the target 2 under the action of the propelling action.
In step S1052 ', the signal 1 is modulated according to the signal space path attenuation parameter X1' and the signal delay parameter Y1 'corresponding to the signal 1 transmitted to the multipoint positioning receiving station 1 at the track point reached by the target 1 under the action of the propulsion action, and the channel control parameter C of the preset geographical environment, so as to obtain the intermediate frequency signal Z1' corresponding to the signal 1.
Similarly, one can obtain: an intermediate frequency signal Z1 "corresponding to the signal 1 transmitted to the multipoint positioning receiving station 2 at the track point reached by the target 1 under the effect of the propelling movement, and an intermediate frequency signal Z1'" corresponding to the signal 1 transmitted to the multipoint positioning receiving station 3 at the track point reached by the target 1 under the effect of the propelling movement. An intermediate frequency signal Z2 ' corresponding to the signal 2 transmitted to the multipoint positioning receiving station 1 at the track point reached by the target 2 under the effect of the propelling action, an intermediate frequency signal Z2 ' corresponding to the signal 2 transmitted to the multipoint positioning receiving station 2 at the track point reached by the target 2 under the effect of the propelling action, and an intermediate frequency signal Z2 "' corresponding to the signal 2 transmitted to the multipoint positioning receiving station 3 at the track point reached by the target 2 under the effect of the propelling action.
In step S106, the intermediate frequency signals corresponding to the respective multilateration receiving stations are up-converted to obtain radio frequency signals corresponding to the intermediate frequency signals.
Specifically, it is determined whether or not the signal delay parameter Y1 'corresponding to the signal 1 transmitted to the multipoint positioning reception station 1 at the track point reached by the target 1 under the effect of the propulsion action and the signal delay parameter Y2' corresponding to the signal 2 transmitted to the multipoint positioning reception station 1 at the track point reached by the target 2 under the effect of the propulsion action are within the same cycle.
If Y1 'and Y2' are not in the same period, it is indicated that the intermediate frequency signals Z1 'and Z2' corresponding to the multipoint positioning receiving station 1 do not overlap. In this case, the intermediate frequency signal corresponding to the multipoint positioning receiving station 1 is Z1 '(or Z2'). The signal stored in buffer 1 is Z1 '(or Z2'). When the signal stored in the buffer 1 is Z1 ', the timing time length of the timer 1 is the signal delay parameter Y1'. When the signal stored in the buffer 1 is Z2 ', the timing time length of the timer 1 is the signal delay parameter Y2'.
If Y1 'is in the same period as Y2', it is indicated that the intermediate frequency signals Z1 'and Z2' corresponding to the multipoint positioning receiving station 1 overlap. In this case, the intermediate frequency signal corresponding to the multipoint positioning receiving station 1 is (Z1 '+ Z2'). The signal stored in the buffer 1 is (Z1 '+ Z2'). Since two targets are set in this example, the number of timing time lengths of the timer 1 is 2. When Z1 ' is the signal to be measured, it is determined that Z2 ' is the interference signal superimposed thereon, and at this time, the timing time length of the timer 1 is the signal delay parameter Y1 '. When Z2 ' is the signal to be measured, it is determined that Z1 ' is the interference signal superimposed thereon, and at this time, the timing time length of the timer 1 is the signal delay parameter Y2 '.
When there are overlaps between intermediate frequency signals corresponding to the same multilateration receiving station, if there are N targets, the number of timing time lengths of the timer corresponding to the multilateration receiving station is N.
Similarly, it is determined whether or not there is an overlap of the intermediate frequency signals corresponding to the multipoint positioning reception station 2 and whether or not there is an overlap of the intermediate frequency signals corresponding to the multipoint positioning reception station 3, respectively.
Here, assuming that the intermediate frequency signals corresponding to the multipoint positioning receiving station 1 do not overlap, and the signal stored in the buffer 1 corresponding to the multipoint positioning receiving station 1 is Z1 ', the timing time length of the timer 1 corresponding to the buffer 1 is Y1'. If the intermediate frequency signals corresponding to the multipoint positioning reception station 2 do not overlap and the signal stored in the buffer 2 corresponding to the multipoint positioning reception station 2 is Z1 ″, the timing length of the timer 2 corresponding to the buffer 2 is Y1 ″. If the intermediate frequency signals corresponding to the multipoint positioning receiving station 3 are overlapped, and the signals stored in the buffer 3 corresponding to the multipoint positioning receiving station 3 are (Z1 '″ + Z2' ″), the timing time lengths of the timer 3 corresponding to the buffer 3 are Y1 '″ and Y2' ″.
In this case, the timers are started collectively by the synchronous clock. Each timer starts to count time step by step from 0. When the timer 1 counts to the timing time length Y1 ', the timer 1 controls the buffer 1 to transmit the intermediate frequency signal Z1'. The intermediate frequency signal Z1' is up-converted into a corresponding rf signal. The radio frequency signal is transmitted via a radio frequency channel 1 to a multipoint positioning receiving station 1 of a multipoint positioning system to be verified.
When the timer 2 counts to the timing time length Y1 ″, the timer 2 controls the buffer 2 to transmit the intermediate frequency signal Z1 ″. The intermediate frequency signal Z1 ″ is up-converted into a corresponding rf signal. The radio frequency signal is transmitted via a radio frequency channel 2 to a multipoint positioning receiving station 2 of the multipoint positioning system to be authenticated.
When the timer 3 counts to the timing time length Y1 "', the timer 3 controls the buffer 3 to transmit the intermediate frequency signal (Z1" ' + Z2 "'). The intermediate frequency signal (Z1 '+ Z2' ″) is up-converted into a corresponding radio frequency signal. The radio frequency signal is transmitted via a radio frequency channel 3 to a multipoint positioning receiving station 3 of a multipoint positioning system to be verified. In this case, the intermediate frequency signal Z1 ' ″ is a signal to be measured, and the intermediate frequency signal Z2 ' ″ is an interference signal superimposed on the intermediate frequency signal Z1 '.
When the timer 3 counts to the timing time length Y2 "', the timer 3 controls the buffer 3 to transmit the intermediate frequency signal (Z1" ' + Z2 "'). The intermediate frequency signal (Z1 '+ Z2' ″) is up-converted into a corresponding radio frequency signal. The radio frequency signal is transmitted via a radio frequency channel 3 to a multipoint positioning receiving station 3 of the multipoint positioning system to be authenticated. In this case, the intermediate frequency signal Z2 ' ″ is a signal to be measured, and the intermediate frequency signal Z1 ' ″ is an interference signal superimposed on the intermediate frequency signal Z2 '.
After the operation corresponding to the current propelling action is executed, each target and each multipoint positioning receiving station are propelled forwards by a track point according to the respective track, and the steps are repeatedly executed. And repeating the steps until all the targets are pushed to the completion at all track points of the motion tracks of the targets.
By applying the method for rapidly generating the multi-target space signal provided by the embodiment of the invention, a signal source close to a real environment can be provided for the multipoint positioning system to be verified by simulating the motion track of a plurality of targets, so that the accuracy and the robustness of the verification result of the overall performance of the multipoint positioning system are effectively improved, and the method has a positive promoting effect on the further development of the multipoint positioning technology.
Those skilled in the art will appreciate that the modules or steps of the invention described above can be implemented in a general purpose computing device, centralized on a single computing device or distributed across a network of computing devices, and optionally implemented in program code that is executable by a computing device, such that the modules or steps are stored in a memory device and executed by a computing device, fabricated separately into integrated circuit modules, or fabricated as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A method for rapidly generating multi-target spatial signals for validating a multi-point positioning system, the method comprising:
setting the number and type of targets, the time, number and type of signals transmitted by each track point of the motion track of each target, the number of multipoint positioning receiving stations corresponding to a multipoint positioning system to be verified and the motion track of each multipoint positioning receiving station, wherein the motion track of each target and the motion track of each multipoint positioning receiving station are set on the basis of an electronic map;
sequencing the time of transmitting signals of all targets at each track point of the respective motion tracks;
simultaneously advancing each target and each multi-point positioning receiving station to a track point according to the respective track;
the following operations are performed for each propulsion action:
sequentially calculating the distances between each target and each multipoint positioning receiving station according to the time sequence according to the sequencing result of the time of the track point transmitting signals of each target arriving under the action of the propelling action;
according to the distance between each target and each multipoint positioning receiving station, obtaining a signal space path attenuation parameter and a signal delay parameter corresponding to a signal transmitted to each multipoint positioning receiving station at a track point reached by each target under the action of propulsion;
modulating the signals according to signal space path attenuation parameters and signal delay parameters corresponding to the signals transmitted to the multipoint positioning receiving stations by the track points reached by the targets under the action of the propelling action to obtain intermediate frequency signals corresponding to the signals transmitted to the multipoint positioning receiving stations by the track points reached by the targets under the action of the propelling action; or modulating the signals according to signal space path attenuation parameters and signal delay parameters corresponding to the signals transmitted to the multipoint positioning receiving stations by the track points reached by the targets under the action of the propelling action and channel control parameters of a preset geographic environment to obtain intermediate frequency signals corresponding to the signals transmitted to the multipoint positioning receiving stations by the track points reached by the targets under the action of the propelling action;
carrying out up-conversion processing on intermediate frequency signals corresponding to the multipoint positioning receiving stations to obtain radio frequency signals corresponding to the intermediate frequency signals;
and transmitting the radio frequency signal to a multipoint positioning system to be verified.
2. The method for rapidly generating the multi-target spatial signal according to claim 1, wherein the step of sequentially calculating the distances between each target and each multi-point positioning receiving station according to the time sequence according to the sequencing result of the time of the track point transmitting signal reached by each target under the action of the propelling action comprises the following steps:
according to the sequencing result of the time of the track point transmitting signals of the targets arriving under the action of the propelling action, sequentially acquiring the positions of the track points of the targets arriving under the action of the propelling action and the positions of the track points of the multipoint positioning receiving stations arriving under the action of the propelling action according to the time sequence;
and calculating the distance between each target and each multi-point positioning receiving station according to the position of the track point reached by each target under the action of the propelling action and the position of the track point reached by each multi-point positioning receiving station under the action of the propelling action.
3. The method for rapidly generating multiple target spatial signals according to claim 1, wherein each target transmits only one signal at each track point of its motion track.
4. A method for rapid generation of multi-target spatial signals according to claim 3, wherein the signals comprise: one of an AC mode interrogation reply signal, an S mode interrogation reply signal, an ADS-B signal, and a DME interrogation reply signal.
5. The method for fast generation of multiple target spatial signals according to claim 1, wherein said receiver is a fixed receiver or a mobile receiver.
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| CN110764050A (en) * | 2019-11-07 | 2020-02-07 | 南京莱斯电子设备有限公司 | Simulation test method for multipoint positioning system |
| CN112986919B (en) * | 2021-02-10 | 2023-08-18 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High-density DBF multipath multi-target signal processing device |
| CN113050052B (en) * | 2021-03-08 | 2022-08-09 | 四川九洲空管科技有限责任公司 | Multi-target response simulation method for friend or foe identification system |
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