Method for detecting target object and corresponding detection apparatus

Patent metadata

Field	Value
Publication number	US-11971468-B2
Application number	US-202117390286-A
Country	US
Kind code	B2
Filing date	Jul 30, 2021
Priority date	Feb 1, 2019
Publication date	Apr 30, 2024
Grant date	Apr 30, 2024

Abstract

A method for detecting a target object implemented by a detection apparatus, where the detection apparatus transmits a radio signal on a frequency band on which mutual interference can be avoided to avoid or reduce interference caused by a transmit signal or a related signal of any detection apparatus when another detection apparatus determines a target. The detection apparatus divides a frequency band or a frequency domain raster based on a determined threshold to allow partial overlapping between frequency bands or rasters.

First claim

What is claimed is:

1. A method comprising:
determining a first frequency band, wherein the first frequency band is one of N frequency bands, and wherein N is a positive integer; and
transmitting a first radio signal on the first frequency band, wherein any frequency band in the N frequency bands partially overlaps at least one frequency band in other N−1 frequency bands of the N frequency bands, wherein a first bandwidth of the first frequency band is a first sweeping bandwidth of the first radio signal, wherein a first absolute value of a first difference between lowest frequencies of any two frequency bands in the N frequency bands is not less than a first threshold (F),
wherein when a second detection apparatus is an interfering source, a value of the first threshold (F) is determined based on at least one of:
a first maximum interference tolerance distance of a first detection apparatus, wherein a signal sent by the second detection apparatus at the first maximum interference tolerance distance to the first detection apparatus causes interference to the first detection apparatus;
a second sweeping bandwidth of a second radio signal of the first detection apparatus, wherein the sweeping bandwidth is a bandwidth occupied by the second radio signal;
a first maximum ranging distance of the first detection apparatus, wherein the first maximum ranging distance is a parameter related to a configuration of the first detection apparatus; or
a first transmit cycle of the first radio signal, wherein the first transmit cycle is a time period of transmitting a complete waveform, and

wherein when the first detection apparatus is a second interfering source, the value of the first threshold (F) is determined based on at least one of:
a second maximum interference tolerance distance of the second detection apparatus;
a third sweeping bandwidth of a third radio signal of the second detection apparatus;
a second maximum ranging distance of the second detection apparatus; or
a second transmit cycle of the third radio signal.

2. The method of claim 1 , wherein a second absolute value of a second difference between a second lowest frequency of any frequency band other than the first frequency band in the N frequency bands and a third lowest frequency of the first frequency band is a positive integer multiple of F.

3. The method of claim 1 , wherein the N frequency bands comprise a second frequency band comprising a first lowest frequency and a third frequency band comprising a second lowest frequency, wherein a second absolute value of a second difference between the first lowest frequency and the second lowest frequency is not less than the first threshold (F), and wherein a second bandwidth of the second frequency band is different from a third bandwidth of the third frequency band.

4. The method of claim 3 , wherein the second frequency band is in a second frequency band subset, wherein the third frequency band is a frequency band in a third frequency band subset, wherein a bandwidth of any frequency band in the second frequency band subset is the second bandwidth, wherein a bandwidth of any frequency band in the third frequency band subset is the third bandwidth, the second bandwidth is different from the third bandwidth, and the second frequency band subset and the third frequency band subset are subsets of the N frequency bands.

5. The method of claim 1 , wherein the value of the first threshold F meets the following formula:
F =max(|Δ f 1 |,|Δf 2 |,|Δf| 3 ,|Δf 4 |)+σ,

wherein Δf_1=B_i−B_j+(B_j((dif_ max {circumflex over ( )}ji)/c+Δτ))/T_cj, wherein Δf_2=B_j/T_cj ((2d_ max {circumflex over ( )}i)/c−(dif_ max {circumflex over ( )}ji)/c−Δτ), wherein Δf_3=B_j/T_cj ((dif_ max {circumflex over ( )}ij)/c+Δτ), wherein Δf_4=B_i/T_ci (T_ci−(dif_ max {circumflex over ( )}ij)/c−Δτ)−B_j/T_cj (T_cj−(2d_ max {circumflex over ( )}j)/c, wherein B i is the second sweeping bandwidth of the second radio signal of the first detection apparatus, wherein B j is the third sweeping bandwidth of the third radio signal of the second detection apparatus, wherein B i >B j , wherein dif_ max {circumflex over ( )}ji is a first maximum interference tolerance distance of the first detection apparatus when the second detection apparatus is the interfering source, wherein Δτ is a transmission timing error, wherein d_ max {circumflex over ( )}i is the first maximum ranging distance of the first detection apparatus, wherein dif_ max {circumflex over ( )}ij is the second maximum interference tolerance distance of the second detection apparatus when the first detection apparatus is the interfering source, wherein d_ max {circumflex over ( )}j is the second maximum ranging distance of the second detection apparatus, wherein c is a speed of light, wherein T ci is the first transmit cycle of the second radio signal, wherein T cj is the second transmit cycle of the third radio signal, and wherein σ is a predetermined constant or a preconfigured constant.

6. The method of claim 3 , wherein the first frequency band is in a first frequency band subset of the N frequency bands, wherein a second absolute value of a second difference between third lowest frequencies of any two frequency bands in the first frequency band subset is a positive integer multiple of a second threshold (F′), wherein the first frequency band subset corresponds to the first detection apparatus, and wherein the first frequency band subset is one of a second frequency band subset or a third frequency band subset.

7. The method of claim 6 , wherein the F′ is greater than or equal to a frequency change range (F1) of the first radio signal within a first time length (T1), F′ and F1 meet a formula: F′=F1+σ, σ a predetermined constant or a preconfigured constant, and σ≥0.

8. The method of claim 7 , wherein a value of the first time length T1 meets one of the following:
T 1=2 *d _ max {circumflex over ( )} i/c;

T 1 =M* 2 *d _ max {circumflex over ( )} i/c;

T
⁢
1

=

2
*
d
*

max
i

**

-
c

dif

⁢

max

i

+

-
c

;

T 1=max=2( d *max⊥ i _/ c (dif, max⊥ i _ /c ));

T 1=2 *d _ max {circumflex over ( )} i/c+Δτ;

T 1 =M* 2 *d _ max {circumflex over ( )} i/c+Δτ;

T
⁢
1

=

2
*
d
*

max
i

**

Assignees

• Huawei Tech Co Ltd

Inventors

• Song sida
• Ma Sha
• Gao Lutao

Classifications

• G01S13/38 Primary

  wherein more than one modulation frequency is used · CPC title

• G01S7/0232 Primary

  Avoidance by frequency multiplex · CPC title

• G01S7/023 Primary

  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

• G01S7/36

  Means for anti-jamming {, e.g. ECCM, i.e. electronic counter-counter measures} · CPC title

• G01S13/343

  using sawtooth modulation · CPC title