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A passive positioning system and method for unmanned aerial vehicles

A passive positioning and unmanned aerial vehicle technology, applied in the field of positioning, can solve problems such as time difference value extraction errors and waste of resources, and achieve the effects of improving accuracy, reducing occupation, and solving time difference extraction errors.

Active Publication Date: 2021-04-27
CHENGDU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, a passive positioning system for unmanned aerial vehicles provided by the present invention solves the problem that the unreasonable selection of the transformation order will cause a large amount of waste of resources when the FPGA is used to realize the Fourier transform function. At the same time, in the case that the time difference value of the two signals is not coupled with the Fourier transform order, it will lead to the problem of time difference value extraction error

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  • A passive positioning system and method for unmanned aerial vehicles
  • A passive positioning system and method for unmanned aerial vehicles
  • A passive positioning system and method for unmanned aerial vehicles

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Embodiment 1

[0079] Such as figure 1 As shown, the present invention provides a passive positioning system for unmanned aerial vehicles, including a signal receiving module, a time difference extraction module and a positioning solution module connected in sequence;

[0080] The signal receiving module is used to receive the UAV image transmission signal radiated by the UAV by using the radio frequency antenna array, and convert the UAV image transmission signal into a digital signal;

[0081] The time difference extraction module is used to use the Kalman-optimal order cross-correlation algorithm to perform time difference extraction processing on the digital signal to obtain an optimal time difference extraction value;

[0082] The positioning solution module is used to calculate the initial estimated coordinates of the UAV according to the optimal time difference extraction value by using a non-recursive algorithm, and use a recursive algorithm to extract the initial estimated coordinat...

Embodiment 2

[0093] Such as Figure 4 Shown, the present invention also provides a kind of unmanned aerial vehicle passive positioning method, and its implementation method is as follows:

[0094] S1. Use the radio frequency antenna array to receive the UAV image transmission signal radiated by the UAV, and convert the UAV image transmission signal into a digital signal;

[0095] In this embodiment, first, load the map and click start, and the system starts to run; the base station starts to receive the UAV image transmission signal, and displays the UAV image transmission signal on the GUI interface. At the same time, it can be detected through the GUI interface whether the system is Normal operation, whether the antenna is receiving signals normally; after the received analog signal is converted into a digital signal, it is transmitted to the FPGA through statistical time division multiplexing technology and the Kalman-optimal order cross-correlation algorithm is used to extract the time...

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Abstract

The invention provides a passive positioning system and method for unmanned aerial vehicles, which belong to the field of positioning technology. According to different actual time differences, the invention selects the corresponding optimal Fourier transform order and performs Kalman Filter, and use the non-recursive algorithm Chan to obtain the initial coordinates by using the three time difference values ​​provided by the time difference extraction part, and then transmit the initial estimated coordinates and time difference values ​​​​of the drone to the recursive algorithm Taylor part for iteration to calibrate Error, and finally solve the high-precision position information. Solve the problem that when using FPGA to realize the Fourier transform function, the unreasonable selection of the transform order will cause a lot of waste of resources. At the same time, when the time difference of the two signals is not coupled with the Fourier transform order, A problem that will cause errors in the time difference value extraction.

Description

technical field [0001] The invention belongs to the technical field of positioning, and in particular relates to a passive positioning system for an unmanned aerial vehicle. Background technique [0002] At present, the passive positioning technology at home and abroad is mainly divided into passive detection and positioning technology relying on non-cooperative external radiation sources and passive positioning technology relying on the target's own radiation source, and both have been developed and applied to a certain extent. However, there is still no passive positioning system with relatively high precision. At the same time, in terms of functions, it is often the pursuit of high performance, and less consideration is given to factors such as cost and quantity. Therefore, designing hardware resources that can be optimized and time difference extraction with high precision Passive positioning system is very necessary. [0003] Passive positioning technology was mainly u...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02
CPCG01S5/02
Inventor 罗正华周方均刘一达雷林曾超廖雄
Owner CHENGDU UNIV