System and method for quickly verifying passive positioning function of single-station interferometer of motion platform

Abstract

The invention discloses a system and a method for quickly verifying a passive positioning function of a single-station interferometer of a motion platform, relates to the field of passive positioning of interferometers, and is used for quickly verifying the passive positioning function of the single-station interferometer at low cost. The method comprises the following steps: generating inertial navigation data for simulating flying of a motion platform around a circle, and issuing the inertial navigation data to an interferometer passive positioning system according to beats; and the simulation radiation source generates a path of radio frequency signal, the radio frequency signal is subjected to power division processing by the power divider and then is transmitted to each antenna of the passive positioning system of the interferometer to provide simulation data required by verification, and finally, the radiation source position calculated by the passive positioning system of the interferometer is compared with the position of the simulated radiation source to realize verification. According to the invention, the hardware cost and complexity of the verification system are greatly reduced, and the verification efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of interferometer passive positioning, and in particular to a system and method for quickly verifying the passive positioning function of a single-station interferometer on a moving platform. Background Art

[0002] Single-station interferometer passive positioning uses a positioning system installed on an aerial motion platform to obtain the angle information sequence of the radiation source over a period of time, and calculates the angle change rate of the radiation source relative to the aerial platform through the angle information sequence to locate the radiation source. The principle of single-station interferometer passive positioning on a motion platform is as follows:

[0003] Assume that the flight speed of the motion platform (hereinafter referred to as the carrier aircraft) is v o , the radiation source is located at a fixed position P, the radiation source and the moving platform are in the same plane, the aircraft system direction finding angle is θ (the nose is 0 degrees), the geographic system direction finding angle is α (the north is 0 degrees), and the heading angle is η. The dynamic principle of mobile single-station passive positioning is as follows Figure 1 shown.

[0004] The relationship between the angles is:

[0005] α=(θ+η)%360 (1)

[0006] When the aircraft flies along this route, the rate of change of the angle between the aircraft and the radiation source is:

[0007]

[0008] The distance R between the carrier and the radiation source is:

[0009]

[0010] According to the interferometer direction finding principle, the phase difference φ can be expressed as:

[0011]

[0012] Where: λ is the signal wavelength, d is the interferometer baseline length.

[0013] Derivative of formula (4):

[0014]

[0015] Substituting equation (6) into equation (7), the distance R between the carrier and the radiation source is:

[0016]

[0017] Using the geographic azimuth arrival angle α of the radiation source, the position of the radiation source can be expressed as:

[0018]

[0019] From the above analysis, we can see that by measuring the phase change rate caused by the linear motion of the carrier and heading change rate The radiation source target distance R can be obtained, and combined with the radiation source's geographic azimuth arrival angle α, the radiation source's position (Px, Py) can be determined.

[0020] The system designed based on the above principle to solve the radiation source position is called a single-station interferometer passive positioning system. After the single-station interferometer passive positioning system is designed, it is necessary to complete the laboratory desktop verification before conducting the on-board flight test. Taking the four-antenna interferometer passive positioning system as an example, the existing verification environment is as follows: Figure 2 shown.

[0021] The functions of the interferometer passive positioning verification environment simulation module are:

[0022] 1) Generate inertial navigation data simulating the straight-line flight of the carrier aircraft and send it to the interferometer passive positioning system in a rhythmic manner;

[0023] 2) The simulated radiation source generates multiple RF signals and can control the phase of each RF signal arriving at different antennas according to the relative position of the carrier and the radiation source and the baseline length of the interferometer passive positioning system.

[0024] The interferometer passive positioning verification environment simulation module includes a control software unit and 5 signal source units.

[0025] The functions of the control software unit are:

[0026] 1) Able to simulate the straight-line flight of the carrier aircraft and generate corresponding inertial navigation data;

[0027] 2) Ability to send inertial navigation data to the interferometer passive positioning system on a beat basis;

[0028] 3) The phase of the radio frequency signal sent by the signal source to the four antennas can be calculated based on the relative position of the carrier and the radiation source and the baseline length of the four antennas of the interferometer passive positioning system;

[0029] 4) Able to control 4 signal source units to generate RF signals with the same frequency, repetition rate, pulse width and different phases.

[0030] The function of the signal source unit is to generate radio frequency signals with the same frequency, repetition rate, pulse width and different phases.

[0031] The signal source unit for constructing the interferometer passive positioning verification environment module needs to support signal synchronization and phase adjustment. Such signal source units are expensive, and five such signal source units are required to construct a set of four-antenna interferometer passive positioning verification environment modules. The control algorithm of the control software unit for the signal source unit is also relatively complex, which is not conducive to large-scale promotion and application. Summary of the invention

[0032] The object of the present invention is to provide a system and method for quickly verifying the passive positioning function of a single-station interferometer on a moving platform in response to all or part of the above-mentioned problems, so as to provide a simple, low-cost interferometer passive positioning verification environment module to quickly verify the passive positioning function of a single-station interferometer.

[0033] The technical solution adopted by the present invention is as follows:

[0034] A system for quickly verifying the passive positioning function of a single-station interferometer on a motion platform, comprising:

[0035] The interferometer passive positioning verification environment simulation module is configured as follows:

[0036] Based on the position of the simulated radiation source, inertial navigation data of the simulated motion platform flying around a circle is generated, and the data is sent to the interferometer passive positioning system in a beat; and the simulated radiation source generates a radio frequency signal, which is transmitted to each antenna of the interferometer passive positioning system after a power divider;

[0037] The comparison and verification module is configured as follows:

[0038] The position of the radiation source calculated by the interferometer passive positioning system according to the received data is compared and verified with the position of the radiation source simulated in the interferometer passive positioning verification environment simulation module.

[0039] Furthermore, the inertial navigation data includes the longitude, latitude, altitude, heading and speed information of the simulated motion platform.

[0040] Furthermore, the interferometer passive positioning verification environment simulation module includes a control software unit and a signal source unit; the control software unit is responsible for generating the inertial navigation data and sending it to the interferometer passive positioning system in a beat; the signal source unit is responsible for generating the radio frequency signal and transmitting it to the power divider.

[0041] Furthermore, the signal source unit generates the radio frequency signal under the control command of the control software unit, or generates the radio frequency signal under manual triggering.

[0042] Furthermore, the interferometer passive positioning verification environment simulation module generates the inertial navigation data according to the following configuration:

[0043] The configuration of the position of the simulated radiation source and the radius of the simulated motion platform flying in a circle around the radiation source is received, the flight environment of the motion platform is simulated, and the inertial navigation data of the motion platform flying in the flight environment is recorded.

[0044] The present invention also provides a method for quickly verifying the passive positioning function of a single-station interferometer of a motion platform, which comprises:

[0045] Based on the position of the simulated radiation source, inertial navigation data of the simulated motion platform flying around a circle is generated and sent to the interferometer passive positioning system in a beat;

[0046] The analog radiation source generates a radio frequency signal, which is transmitted to each antenna of the interferometer passive positioning system after power division processing by a power divider;

[0047] The radiation source position calculated by the interferometer passive positioning system based on the received data is compared and verified with the radiation source position simulated in the interferometer passive positioning verification environment simulation module.

[0048] Furthermore, the inertial navigation data includes the longitude, latitude, altitude, heading and speed information of the simulated motion platform.

[0049] Furthermore, the inertial navigation data is generated by configuring the control software unit and sent to the interferometer passive positioning system in a rhythmic manner; and the radio frequency signal is generated by configuring the signal source unit and transmitted to the power divider.

[0050] Furthermore, the radio frequency signal is generated by configuring the control software unit to generate a control instruction to act on the signal source unit, or by manually triggering the signal source unit.

[0051] Further, the generating of inertial navigation data of a simulated motion platform flying around a circle based on the simulated position of the radiation source includes:

[0052] The flight environment of the motion platform is simulated by configuring the position of the simulated radiation source and the radius of the simulated motion platform flying in a circle around the radiation source, and the inertial navigation data of the motion platform flying is recorded from the flight environment.

[0053] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0054] Compared with the existing interferometer passive positioning verification environment simulation module, the interferometer passive positioning verification environment simulation module in the solution proposed by the present invention has the following advantages:

[0055] a) The signal source unit is changed from a signal source supporting adjustable phase to a common signal source, which greatly reduces the cost in signal source selection;

[0056] b) The signal source units are reduced from multiple to only one, which greatly reduces the cost in terms of the number of signal sources;

[0057] c) There is no need to write a separate algorithm to control the phase of the signal source output, which reduces the complexity of the module control strategy.

[0058] That is, the simplified single-station interferometer passive positioning system verification environment module reduces the cost, simplifies the complexity of the verification environment, and can quickly build and carry out interferometer passive positioning verification work. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0060] Figure 1 : Illustration of the dynamic principle of single-station interferometer passive positioning.

[0061] Figure 2 : Block diagram of the verification environment for the single-station interferometer passive positioning system.

[0062] Figure 3 : Simplified single-station interferometer passive positioning system verification environment block diagram.

[0063] Figure 4 : Scenario diagram of simplified interferometer passive positioning verification environment simulation. DETAILED DESCRIPTION

[0064] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0065] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0066] Example 1

[0067] A system for quickly verifying the passive positioning function of a single-station interferometer on a moving platform, such as Figure 1 As shown, the system includes an interferometer passive positioning verification environment simulation module and a comparison verification module, which, when in use, is connected to the interferometer passive positioning system to be verified.

[0068] In this embodiment, the interferometer passive positioning verification environment simulation module is configured as follows:

[0069] Based on the position of the simulated radiation source, inertial navigation data of a simulated carrier aircraft flying in a circle is generated and sent to the interferometer passive positioning system to be verified in a rhythmic manner; and the simulated radiation source generates a radio frequency signal, which is transmitted to each antenna of the interferometer passive positioning system to be verified after passing through a power divider.

[0070] Typically, an interferometer passive positioning verification environment simulation module receives the position of a simulated radiation source and the radius of a simulated carrier aircraft flying in a circle around the radiation source, simulates the flight environment of the carrier aircraft, and records the inertial navigation data of the carrier aircraft flying in the flight environment to generate inertial navigation data of a simulated carrier aircraft flying around a circle.

[0071] After receiving these data (ie, inertial navigation data and radio frequency signals), the interferometer passive positioning system calculates the position of the radiation source (Px, Py) according to the internally configured solution method (the solution method configured based on the principles of the background technology part).

[0072] The comparison and verification module is configured as follows:

[0073] The position of the radiation source calculated by the interferometer passive positioning system based on the received data is compared and verified with the position of the radiation source simulated in the interferometer passive positioning verification environment simulation module.

[0074] Based on the special design of the flight path of the carrier aircraft, this embodiment only needs to generate one RF signal, and does not need to consider the phase difference between multiple RF signals. Therefore, only one common signal source is needed, which reduces the construction cost of the system in terms of selection and quantity. In addition, since the phase of each signal source does not need to be adjusted in this embodiment, the control logic in the verification process is extremely simple, and the verification speed is more efficient compared to the traditional verification scheme.

[0075] Specifically, if Figure 3 As shown, the interferometer passive positioning verification environment simulation module includes a control software unit and a signal source unit.

[0076] The functions of the control software unit are:

[0077] a) Able to simulate the aircraft flying in a circle and generate corresponding inertial navigation data;

[0078] b) It can send inertial navigation data to the interferometer passive positioning system in a rhythmic manner. The inertial navigation data contains the longitude, latitude, altitude, heading and speed information of the carrier aircraft.

[0079] And c) can control a signal source unit to generate a radio frequency signal. Of course, this function c) is not required when manually triggering the signal source unit to generate a radio frequency signal.

[0080] The function of the signal source unit is to generate a radio frequency signal, which can be achieved by function c) of the control software unit or by manual triggering.

[0081] like Figure 4 The figure shows an embodiment of the flight path of a carrier aircraft in the interferometer passive positioning verification environment simulated by the present system.

[0082] like Figure 4 As shown in the figure, the simplified interferometer passive positioning verification environment module of this system generates a carrier with a speed V A The inertial navigation data of the circle is sent to the interferometer passive positioning system, and the center of the circle is the position of the simulated radiation source (P x , P y ), the radius of the circle is the distance R between the carrier and the radiation source. The generated RF signals have the same phase when reaching each antenna of the interferometer passive positioning system and are incident perpendicular to the antenna array, that is, the incident angle of the radiation source is 0°. Since the antenna array is installed on both sides of the fuselage, the incident angle θ of the radiation source relative to the carrier is 90°.

[0083] The interferometer passive positioning system obtains the angle information sequence of the radiation source over a period of time and calculates the phase change rate according to the change of the incident phase of the radiation source. (Phase Change Rate is 0), and the heading change rate is calculated according to the heading change The distance R of the radiation source relative to the carrier aircraft can be obtained, and combined with the carrier aircraft heading angle, the position of the radiation source (Px, Py) can be determined.

[0084] This embodiment conducts an experiment on the interferometer passive positioning system. The control software unit is used to set the carrier aircraft to fly clockwise or counterclockwise around a circle with (Px, Py) as the center and R as the radius. The signal source injects a signal into the right or left interferometer antenna array of the interferometer passive positioning system (injects a signal into the right interferometer antenna array when flying clockwise, and injects a signal into the left interferometer antenna array when flying counterclockwise). The interferometer passive positioning system can locate the radiation source position. The comparison verification module obtains the radiation source position located by the interferometer passive positioning system and the radiation source position simulated by the interferometer passive positioning verification environment simulation module. The results show that the position located by the interferometer passive positioning system is near the simulated center of the circle (Px, Py).

[0085] Example 2

[0086] This embodiment introduces a method for quickly verifying the passive positioning function of a single-station interferometer on a moving platform by comparing it with the system in Embodiment 1. The method includes:

[0087] Generate inertial navigation data of a simulated carrier aircraft flying in a circle based on the position of a simulated radiation source. The flight environment of the carrier aircraft can be simulated by configuring the position of the simulated radiation source and the radius of the simulated carrier aircraft flying in a circle around the radiation source, and the inertial navigation data of the carrier aircraft flying can be recorded from the flight environment. Send the inertial navigation data to the interferometer passive positioning system in a beat. In some specific embodiments, the inertial navigation data can be generated by configuring a control software unit and sent to the interferometer passive positioning system in a beat. The inertial navigation data contains the longitude, latitude, altitude, heading and speed information of the simulated carrier aircraft.

[0088] The analog radiation source generates a radio frequency signal, which is transmitted to each antenna of the interferometer passive positioning system after power division processing by the power divider. In some specific embodiments, the radio frequency signal can be generated by configuring the signal source unit to be transmitted to the power divider. The radio frequency signal can be generated by configuring the control software unit to generate a control instruction to act on the signal source unit, or by manually triggering the signal source unit.

[0089] The radiation source position calculated by the interferometer passive positioning system based on the received data is compared and verified with the radiation source position simulated in the interferometer passive positioning verification environment simulation module.

[0090] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A system for quickly verifying the passive positioning function of a single-station interferometer on a motion platform, characterized in that: include: The interferometer passive positioning verification environment simulation module is configured as follows: Based on the position of the simulated radiation source, inertial navigation data of the simulated motion platform flying around a circle is generated, and the data is sent to the interferometer passive positioning system in a beat; and the simulated radiation source generates a radio frequency signal, which is transmitted to each antenna of the interferometer passive positioning system after a power divider; The comparison and verification module is configured as follows: The position of the radiation source calculated by the interferometer passive positioning system according to the received data is compared and verified with the position of the radiation source simulated in the interferometer passive positioning verification environment simulation module.

2. The system for quickly verifying the passive positioning function of a single-station interferometer on a moving platform as claimed in claim 1, characterized in that: The inertial navigation data includes the longitude, latitude, altitude, heading and speed information of the simulated motion platform.

3. The system for quickly verifying the passive positioning function of a single-station interferometer on a moving platform as claimed in claim 1 or 2, characterized in that: The interferometer passive positioning verification environment simulation module includes a control software unit and a signal source unit; the control software unit is responsible for generating the inertial navigation data and sending it to the interferometer passive positioning system in a beat; the signal source unit is responsible for generating the radio frequency signal and transmitting it to the power divider.

4. The system for rapidly verifying the passive positioning function of a single-station interferometer on a moving platform as claimed in claim 3, characterized in that: The signal source unit generates the radio frequency signal under the control command of the control software unit, or generates the radio frequency signal under manual triggering.

5. The system for quickly verifying the passive positioning function of a single-station interferometer on a moving platform as claimed in claim 1 or 2, characterized in that: The interferometer passive positioning verification environment simulation module generates the inertial navigation data according to the following configuration: The configuration of the position of the simulated radiation source and the radius of the simulated motion platform flying in a circle around the radiation source is received, the flight environment of the motion platform is simulated, and the inertial navigation data of the motion platform flying in the flight environment is recorded.

6. A method for quickly verifying the passive positioning function of a single-station interferometer on a moving platform, characterized in that: include: Based on the position of the simulated radiation source, inertial navigation data of the simulated motion platform flying around a circle is generated and sent to the interferometer passive positioning system in a beat; The analog radiation source generates a radio frequency signal, which is transmitted to each antenna of the interferometer passive positioning system after power division processing by a power divider; The radiation source position calculated by the interferometer passive positioning system based on the received data is compared and verified with the radiation source position simulated in the interferometer passive positioning verification environment simulation module.

7. The method for quickly verifying the passive positioning function of a single-station interferometer on a moving platform as claimed in claim 6, characterized in that: The inertial navigation data includes the longitude, latitude, altitude, heading and speed information of the simulated motion platform.

8. The method for quickly verifying the passive positioning function of a single-station interferometer on a moving platform as claimed in claim 6 or 7, characterized in that: The inertial navigation data is generated by configuring the control software unit and sent to the interferometer passive positioning system in a rhythmic manner; the radio frequency signal is generated by configuring the signal source unit and transmitted to the power divider.

9. The method for quickly verifying the passive positioning function of a single-station interferometer on a moving platform as claimed in claim 8, characterized in that: The radio frequency signal is generated by configuring the control software unit to generate a control instruction to act on the signal source unit, or by manually triggering the signal source unit to generate the radio frequency signal.

10. The method for quickly verifying the passive positioning function of a single-station interferometer on a moving platform according to claim 6 or 7, characterized in that: The method generates inertial navigation data of simulating the motion platform flying around a circle based on the position of the simulated radiation source, including: The flight environment of the motion platform is simulated by configuring the position of the simulated radiation source and the radius of the simulated motion platform flying in a circle around the radiation source, and the inertial navigation data of the motion platform flying is recorded from the flight environment.

Images