JAMMING DEVICE AND JAMMING METHOD

• US 20200136745A1
• Filed: 10/02/2019
• Published: 04/30/2020
• Est. Priority Date: 04/07/2017
• Status: Active Grant

• Current Assignee: SZ DJI Technology Co., Ltd. (d/b/a DJI) (iFlight Technology Company Limited)
• Original Assignee: SZ DJI Technology Co., Ltd. (d/b/a DJI) (iFlight Technology Company Limited)
• Inventors: CHEN, Tao, DENG, Renqin, TANG, Yijun, YI, Mingguo
• Granted Patent: US 10,999,001 B2
• Time in Patent Office: Days
• CPC Class Codes: H04K 2203/22 for communication related to vehicles
• CPC Class Codes: H04K 2203/34 involving multiple cooperating jammers
• CPC Class Codes: H04K 3/00 Jamming of communication; Counter-measures
• CPC Class Codes: H04K 3/42 characterized by the control of the jamming frequency or wavelength
• CPC Class Codes: H04K 3/43 characterized by the control of the jamming power, signal-to-noise ratio or geographic coverage area

Abstract

A jamming device includes a periodic signal generating circuit configured to generate a periodic signal, a noise generating circuit configured to generate a noise signal, and a sweep-signal generating circuit coupled to the periodic signal generating circuit and the noise generating circuit. The sweep-signal generating circuit is configured to generate a frequency-sweep signal based on the periodic signal and the noise signal.

Claims

1. A jamming device comprising:

a periodic signal generating circuit configured to generate a periodic signal;

a noise generating circuit configured to generate a noise signal; and

a sweep-signal generating circuit coupled to the periodic signal generating circuit and the noise generating circuit, the sweep-signal generating circuit being configured to generate a frequency-sweep signal based on the periodic signal and the noise signal.

2. The jamming device of claim 1, wherein the sweep-signal generating circuit comprises:

a level shifter coupled to the periodic signal generating circuit and the noise generating circuit, the level shifter being configured to superimpose the noise signal on the periodic signal to generate a superimposed periodic signal; and

a voltage-controlled oscillator (VCO) coupled to the level shifter and configured to generate the frequency-sweep signal according to the superimposed periodic signal.

3. The jamming device of claim 2, wherein the level shifter comprises an operational amplifier.

4. The jamming device of claim 3, wherein the operational amplifier is configured as an adder or a subtractor.

5. The jamming device of claim 3, wherein the operational amplifier is further configured to increase or decrease a voltage level of the superimposed periodic signal.

6. The jamming device of claim 2, wherein the VCO is configured to generate the frequency-sweep signal having a sweep range from about 2.4 GHz to about 2.485 GHz or a sweep range from about 5.7 GHz to about 5.85 GHz.

7. The jamming device of claim 2, wherein the VCO is configured to generate the frequency-sweep signal comprising a sweeping noise having a bandwidth of about 2 MHz.

8. The jamming device of claim 1, further comprising:

a power amplification circuit coupled to the sweep-signal generating circuit and configured to amplify the frequency-sweep signal to generate an amplified frequency-sweep signal.

9. The jamming device of claim 8, further comprising:

an antenna coupled to the power amplification circuit and configured to transmit the amplified frequency-sweep signal.

10. The jamming device of claim 1, wherein the periodic signal generating circuit is configured to generate the periodic signal having a period between about 5 μ

s to about 10 μ

s.

11. The jamming device of claim 1, wherein the periodic signal generating circuit comprises a sawtooth wave generating circuit configured to generate a sawtooth wave as the periodic signal.

12. The jamming device of claim 11, wherein the sawtooth wave generating circuit comprises a 555 timer.

13. The jamming device of claim 12, wherein the 555 timer is configured to be in an astable mode.

14. The jamming device of claim 1, wherein the periodic signal generating circuit comprises a triangle wave generating circuit configured to generate a triangle wave as the periodic signal.

15. The jamming device of claim 1, wherein the noise generating circuit is configured to generate a narrow-band white Gaussian noise as the noise signal.

16. The jamming device of claim 15, wherein the noise generating circuit comprises a Zener diode.

17. The jamming device of claim 16, wherein the noise generating circuit further comprises:

an audio amplification circuit coupled to the Zener diode and configured to amplify an output of the Zener diode; and

a filter circuit coupled to the audio amplification circuit and configured to filter an output of the audio amplification circuit.

18. The jamming device of claim 17, wherein the noise generating circuit further comprises an amplitude adjusting circuit coupled to the filter circuit and configured to adjust an amplitude of an output of the filter circuit.

19. The jamming device of claim 18, wherein the amplitude adjusting circuit comprises an adjustable resistor or a variable-gain amplifier.

20. A jamming apparatus comprising:

a first jamming device comprising;

a first periodic signal generating circuit configured to generate a first periodic signal;

a first noise generating circuit configured to generate a first noise signal; and

a first sweep-signal generating circuit coupled to the first periodic signal generating circuit and the first noise generating circuit, the first sweep-signal generating circuit being configured to generate a first frequency-sweep signal having a first sweep range based on the first periodic signal and the first noise signal;

a second jamming device comprising;

a second periodic signal generating circuit configured to generate a second periodic signal;

a second noise generating circuit configured to generate a second noise signal; and

a second sweep-signal generating circuit coupled to the second periodic signal generating circuit and the second noise generating circuit, the second sweep-signal generating circuit being configured to generate a second frequency-sweep signal having a second sweep range based on the second periodic signal and the second noise signal; and

a switch coupled to the first jamming device and the second jamming device, and configured to turn on or off at least one of the first jamming device or the second jamming device.