Microwave radar and unmanned aerial vehicle

Patent metadata

Field	Value
Publication number	US-12099136-B2
Application number	US-202117326301-A
Country	US
Kind code	B2
Filing date	May 20, 2021
Priority date	Nov 21, 2018
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

The present disclosure provides a UAV control method. The method includes controlling an antenna device of a microwave radar of the UAV to transmit a microwave transmission signal and obtain a received signal, the microwave transmission signal and the received signal both being trapezoidal modulation waveforms, and one cycle of the trapezoidal modulation waveform including a frequency rising part, a frequency falling part, and a fixed frequency part; obtaining an intermediate frequency signal mixed by a frequency of the microwave transmission signal and the received signal to the radar controller, and determining whether the received signal is an interference signal based on the intermediate frequency signal; determining coordinate information of a detection target corresponding to the received signal if the received signal is not the interference signal; and updating a trajectory of the UAV based on the coordinate information of the detection target.

First claim

What is claimed is:

1. A UAV control method comprising:
controlling an antenna device of a microwave radar of the UAV to transmit a microwave transmission signal and obtain a received signal, the microwave transmission signal and the received signal both being trapezoidal modulation waveforms, and one cycle of the trapezoidal modulation waveform including a frequency rising part, a frequency falling part, and a fixed frequency part;
obtaining an intermediate frequency signal mixed by a frequency of the microwave transmission signal and the received signal to the radar controller, and determining whether the received signal is an interference signal based on the intermediate frequency signal, including:
determining a first intermediate frequency corresponding to the frequency rising part of the received signal and a second intermediate frequency signal corresponding to the frequency falling part of the received signal based on the intermediate frequency; and
determining whether the received signal is the interference signal based on a frequency difference between the first intermediate frequency and the second intermediate frequency;

determining coordinate information of a detection target corresponding to the received signal if the received signal is not the interference signal; and
updating a trajectory of the UAV based on the coordinate information of the detection target.

2. The UAV control method of claim 1 , wherein determining whether the received signal is the interference signal based on the frequency difference between the first intermediate frequency and the second intermediate frequency includes:
calculating the frequency difference between the first intermediate frequency and the second intermediate frequency; and
determining whether the received signal is the interference signal based on a magnitude relationship between the frequency difference and a predetermined threshold.

3. The UAV control method of claim 2 , wherein determining whether the received signal is the interference signal based on the magnitude relationship between the frequency difference and the predetermined threshold includes:
determining the received signal is the interference signal when the frequency difference is greater than or equal to the predetermined threshold; and
determining the received signal is an echo signal of the microwave transmission signal when the frequency difference is less than the predetermined threshold.

4. A microwave radar comprising:
an antenna device; and
a radar controller in communication with the antenna device, the radar controller being configured to:
control the antenna device to transmit a microwave transmission signal and obtain a received signal, the microwave transmission signal and the received signal both being trapezoidal modulation waveforms, and one cycle of the trapezoidal modulation waveform including a frequency rising part, a frequency falling part, and a fixed frequency part;
obtain an intermediate frequency signal mixed by a frequency of the microwave transmission signal and the received signal to the radar controller, and determine whether the received signal is an interference signal based on the intermediate frequency signal, including:
determining a first intermediate frequency corresponding to the frequency rising part of the received signal and a second intermediate frequency signal corresponding to the frequency falling part of the received signal based on the intermediate frequency; and
determining whether the received signal is the interference signal based on a frequency difference between the first intermediate frequency and the second intermediate frequency.

5. The microwave radar of claim 4 , wherein the radar controller is further configured to:
calculate the frequency difference between the first intermediate frequency and the second intermediate frequency; and
determine whether the received signal is the interference signal based on a magnitude relationship between the frequency difference and a predetermined threshold.

6. The microwave radar of claim 5 , wherein the radar controller is further configured to:
determine the received signal is the interference signal when the frequency difference is greater than or equal to the predetermined threshold; and
determine the received signal is an echo signal of the microwave transmission signal when the frequency difference is less than the predetermined threshold.

7. A mobile platform comprising:
a microwave radar including:
an antenna device; and
a radar controller in communication with the antenna device, the radar controller being configured to:
control the antenna device to transmit a microwave transmission signal and obtain a received signal, the microwave transmission signal and the received signal both being trapezoidal modulation waveforms, and one cycle of the trapezoidal modulation waveform including a frequency rising part, a frequency falling part, and a fixed frequency part;
obtain an intermediate frequency signal mixed by a frequency of the microwave transmission signal and the received signal to the radar controller, and determine whether the received signal is an interference signal based on the intermediate frequency signal, including:
determining a first intermediate frequency corresponding to the frequency rising part of the received signal and a second intermediate frequency signal corresponding to the frequency falling part of the received signal based on the intermediate frequency; and
determining whether the received signal is the interference signal based on a frequency difference between the first intermediate frequency and the second intermediate frequency; and

a controller in communication with the microwave radar, the controller being configured to:
determine coordinate information of a detection target corresponding to the received signal if the received signal is not the interference signal; and
update a trajectory of the mobile platform based on the coordinate information of the detection target.

8. The mobile platform of claim 7 , wherein the radar controller is further configured to:
calculate the frequency difference between the first intermediate frequency and the second intermediate frequency; and
determine whether the received signal is the interference signal based on a magnitude relationship between the frequency difference and a predetermined threshold.

9. The mobile platform of claim 8 , wherein the radar controller is further configured to:
determine the received signal is the interference signal when the frequency difference is greater than or equal to the predetermined threshold; and
determine the received signal is an echo signal of the microwave transmission signal when the frequency difference is less than the predetermined threshold.

Assignees

• Sz Dji Technology Co Ltd

Inventors

• Li Xun
• Wang Chunming

Classifications

• G05D1/606

  Compensating for or utilising external environmental conditions, e.g. wind or water currents (station keeping G05D1/611) · CPC title

• G01S7/354

  Extracting wanted echo-signals (Doppler systems G01S13/50) · CPC title

• G01S13/933

  of aircraft or spacecraft · CPC title

• G05D1/106

  Change initiated in response to external conditions, e.g. avoidance of elevated terrain or of no-fly zones · CPC title

• G01S7/023

  Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques (auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36) · CPC title