A method for optimizing pulse signal direction finding time efficiency of direction finding equipment
By extracting and splicing pulse signal data in the direction finding equipment, the problem of the direction finding time of the pulse signal is limited, and the direction finding effect in nanoseconds is achieved.
Patent Information
- Application Number
- CN202211012355.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-08-23
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2042-08-23
AI Technical Summary
When the existing direction finding device is used to measure the pulse signal, since the number of direction finding channels is less than the number of antennas, the number of switches increases, and the data sampling length becomes longer, making it impossible to effectively process short-time pulse signals.
By independently extracting the signal amplitude or modulus value in each direction finding channel, sampling points exceeding the threshold are used as valid data, multiple pulse signal data are spliced and combined, and data filling is performed using the periodicity of the pulse signal until the required number of sampling points is reached, and sent to the direction finding algorithm to calculate the indicator dimension.
The pulse signal direction finding in nanosecond level is realized, which solves the problem of limited sampling points and switching times in traditional methods, and improves the efficiency of the direction finding equipment.
Smart Images
Figure CN115291161B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of radio communications and radio spectrum monitoring, and in particular to a method for optimizing the direction finding time efficiency of a pulse signal for a direction finding device, and in particular to a method for optimizing the direction finding time efficiency of a pulse signal for a direction finding device with fewer receiving channels than antennas. Background Art
[0002] In the fields of radio communications and spectrum monitoring, to reduce the cost of direction-finding equipment, a technology has emerged in which the number of direction-finding channels is smaller than the number of antennas, with switches switching on and off the corresponding antennas. This switching requires a longer data sampling length. Assuming the number of required switching times is N, the required data sampling length needs to be increased by a factor of N. This technology cannot be used for pulse signals where the signal retention time is insufficient to complete signal acquisition for all antennas. Summary of the Invention
[0003] In order to achieve the purpose of obtaining the arrival direction of a short-time pulse signal as much as possible without increasing the equipment cost, the present invention provides a method for optimizing the pulse signal direction finding time efficiency of a direction finding device.
[0004] In order to achieve the above object, the present invention adopts the following technical solutions:
[0005] A method for optimizing the direction finding time efficiency of a pulse signal of a direction finding device. Assuming that the direction finding device needs to perform N switching operations and each switching operation requires M sampling points, the total number of direction finding points required by the direction finding device is N×M.
[0006] Each direction finding channel extracts the signal amplitude at a single sampling point and compares it with the set direction finding threshold. If the sampling data of any channel exceeds the direction finding threshold, the data of the current sampling point corresponding to all direction finding channels are extracted as the valid data of one sampling point. If the amplitude of the current sampling data of all channels does not exceed the direction finding threshold, the data of the current sampling point corresponding to all direction finding channels are discarded.
[0007] The extracted sampled data are filled in accordance with the data splicing method required by the direction finding device until the M points required for the first switch conduction are completely filled.
[0008] When the M points required for the first switch-on are fully filled, the direction-finding device switches to the second switch-on mode to fill in data for M points. This process continues until the required N switch-on cycles have completed data collection and filling of the corresponding M points, obtaining the required N × M direction-finding points.
[0009] After all N groups of M data are filled, the data are sent to the direction finding algorithm to complete the direction finding calculation and obtain the direction finding value of the current signal.
[0010] The direction finding device needs to perform N switching operations, and each switching operation requires M sampling points.
[0011] All direction finding channels calculate the modulus of the current sampling point based on the IQ data of a single sampling point and compare the calculated modulus with the set direction finding threshold. If the modulus of the sampled data of any channel exceeds the direction finding threshold, the data of the current sampling point corresponding to all direction finding channels are extracted as the valid data of one sampling point. If the modulus of the current sampling data of all channels does not exceed the direction finding threshold, the data of the current sampling point corresponding to all direction finding channels are discarded.
[0012] A more preferred technical solution is to fill the extracted valid sampling data until the M points required for the first switch conduction are completely filled.
[0013] Furthermore, the direction finding device is switched to the Nth switch conduction mode, and this process is continued until the required N switch switches have completed the data collection and filling of the corresponding M points, and the N×M direction finding points required by the device are obtained.
[0014] Furthermore, the data is fed into a direction finding algorithm to complete the direction finding calculation and obtain the direction finding value of the current signal.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] Based on the traditional switch-type direction-finding equipment, the present invention utilizes the periodicity of the pulse signal and splices and combines multiple pulse signals after removing the background noise. This can make the direction-finding time of the direction-finding equipment no longer limited by the number of sampling points and the number of switch switching times, and can achieve nanosecond-level pulse signal direction-finding. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the antenna combination of the present invention in the case of 3 direction-finding channels and 7 direction-finding antennas.
[0018] Figure 2 It is a schematic diagram of the extraction and splicing combination method of the pulse signal of the present invention. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0020] On the contrary, this application covers any alternatives, modifications, equivalents, and solutions made within the spirit and scope of this application as defined by the claims. Furthermore, to facilitate a better understanding of this application, certain specific details are described in detail below in the detailed description of this application. Those skilled in the art will be able to fully understand this application without these details.
[0021] like Figure 1-2 As shown, since the radiating equipment of pulse signals such as radar generally transmits signals repeatedly according to a certain period, this method uses the periodicity of the signal to be measured to accumulate signals and independently extracts signals with smaller pulse widths. The core lies in independently extracting the valid data after removing the noise between pulses, and combining and filling the valid signals according to the data splicing method required by the direction-finding equipment. The direction-finding of short-time pulse signals is achieved by accumulating data from multiple pulse signals.
[0022] Example 1: Figure 1 As shown, for a direction-finding device with three direction-finding channels and seven direction-finding antennas, three switching cycles are required to fully acquire the signal data corresponding to all antennas. Each switching cycle requires 128 sampling points, with a sampling rate of 100 MSPS and a sampling time of 10 ns per sampling point. Table 1 shows the direction-finding antennas that are active in each switching cycle.
[0023] Table 1 List of direction-finding antennas corresponding to direction-finding channels turned on when switches are switched on
[0024]
[0025] Assuming that the pulse signal width to be detected is 500ns, according to the content of the present invention, when the switch is switched for the first time, the three direction finding channels are connected to antennas 1, 2, and 5 respectively. Figure 2 In the pulse signal combination filling method shown, when the modulus of the current sampling point signal received by any of the three direction finding channels exceeds the direction finding threshold, the current sampling point data corresponding to the three direction finding channels is extracted as the valid data for that sampling point. If the modulus of the current sampling data of all channels does not exceed the direction finding threshold, the current sampling point data corresponding to all direction finding channels is discarded.
[0026] A 500ns pulse signal can generally fill in about 40 sampling points of valid data after removing the sampling points on the rising and falling edges that are below the threshold. Through the combined accumulation of about 3-4 pulse signals, the sampling data required for the first switch switching can be completely filled in.
[0027] During the second and third switching operations, the direction finding device fills in the required data in the same manner to obtain 3×128 valid sampling data points required for the three switching operations.
[0028] The 3×128 effective direction finding data are fed into the direction finding algorithm for calculation to obtain the direction value of the current pulse group.
[0029] Preferably, the switch response speed of the antenna switching should be as fast as possible.
[0030] Preferably, the directional patterns of the antennas should be as consistent as possible.
[0031] Preferably, the bandwidth of the direction finding channel needs to be greater than the bandwidth of the pulse signal to be measured, and the filter is designed as a filter with smooth time response to reduce the group delay fluctuation of the direction finding channel, so as to optimize the detected pulse rising and falling edges and increase the number of effective detection points.
[0032] Based on the traditional switch-type direction-finding equipment, the present invention utilizes the periodicity of the pulse signal and splices and combines multiple pulse signals after removing the background noise. This can make the direction-finding time of the direction-finding equipment no longer limited by the number of sampling points and the number of switch switching times, and can achieve nanosecond-level pulse signal direction-finding.
[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A method for optimizing the direction finding time efficiency of a pulse signal direction finding device, characterized in that: The following steps are involved: Extract the signal amplitude of each direction finding channel according to a single sampling point; compare the extracted signal amplitude with the set direction finding threshold; If the amplitude of the sampled data of any channel exceeds the direction finding threshold, the current sampling point data corresponding to all direction finding channels are extracted as valid data; if the amplitude of the current sampled data of all channels does not exceed the direction finding threshold, the current sampling point data corresponding to all direction finding channels are discarded; The method for extracting the current sampling point data corresponding to all direction finding channels is as follows: assuming that the direction finding device needs to perform N switching operations, and each switching operation requires M sampling points; the extracted sampling data is filled in accordance with the data splicing method required by the direction finding device until the M points required for the first switching operation are completely filled; The data filling method is as follows: when the M points required for the first switch conduction are completely filled, the direction finding device switches to the second switch conduction mode to fill the data of M points; this process is continued until the required N switch switches have completed the data collection and filling of the corresponding M points.
2. The method for optimizing the pulse signal direction finding time efficiency of a direction finding device according to claim 1, characterized in that: The direction finding device switches to the second switch conduction mode to fill the data of M points in the following manner: after all N groups of M data are filled, the data are sent to the direction finding algorithm to complete the directionality calculation and obtain the directionality value of the current signal.