Object locating method and apparatus
This application provides example object locating methods and apparatuses. One example method includes performing, by a first device, pulse measurement on a target object with assistance of a second device, where the pulse measurement is performed on the target object by using two types of pulse signals, and pulse repetition frequencies of the two types of pulse signals are different. The first device can then locate the target object based on a pulse measurement result of the pulse measurement.
1. An object locating method, comprising:
sending, by a first device, a first information frame to a second device for a first time and a second time;
performing, by the first device, pulse measurement on a target object by using a first type of pulse signal and a second type of pulse signal sent by the second device, wherein the first type of pulse signal is sent by the second device after the first information frame is sent to the second device for the first time, and the second type of pulse signal is sent by the second device after the first information frame is sent to the second device for the second time, and wherein pulse repetition frequencies of the first type of pulse signal and the second type of pulse signal are different; and
locating, by the first device, the target object based on a pulse measurement result of the pulse measurement.
2. The method according to claim 1 , wherein the pulse repetition frequencies of the two types of pulse signals are prime numbers of each other.
3. The method according to claim 2 , wherein the pulse measurement is performed in a fine timing measurement (FTM) process of the first device and the second device.
4. The method according to claim 3 ,
wherein the first information frame triggers the second device to perform pulse measurement on the target object by using a target pulse signal, and the target pulse signal is one or two of the first type of pulse signal and the second type of pulse signal.
5. The method according to claim 3 , wherein the first type of pulse signal and the second type of pulse signal are both sent by the first device, and wherein the performing, by the first device, pulse measurement on the target object with assistance of the second device comprises:
sending, by the first device, a second information frame to the second device, wherein the second information frame notifies the second device that the first device is to perform pulse measurement on the target object.
6. The method according to claim 5 , wherein a subtype field in a frame control field in the second information frame comprises an identifier of the second information frame.
7. The method according to claim 5 , wherein a station info field, having a special application identifier (AID) value, in the second information frame comprises a parameter of a target pulse signal used by the first device, and the target pulse signal is one or two of the first type of pulse signal and the second type of pulse signal.
8. The method according to claim 7 , wherein the performing, by the first device, pulse measurement on the target object with assistance of the second device comprises:
sending, by the first device, a third information frame to the second device, wherein the third information frame is used to query whether the second device participates in the pulse measurement of the target object.
9. The method according to claim 8 , wherein the performing, by the first device, pulse measurement on the target object with assistance of the second device comprises:
sending, by the first device, a fourth information frame to the second device, wherein the fourth information frame comprises at least one of first indication information or second indication information, the first indication information indicates whether the second device needs to report a pulse measurement result of the target object, and the second indication information indicates whether the second device needs to report an FTM measurement result.
10. The method according to claim 9 , wherein the fourth information frame comprises a common info field, and the first indication information and the second indication information are comprised in a feedback control field in the common info field.
11. The method according to claim 1 , wherein:
a trigger-dependent common info field in the first information frame comprises indication information indicating the second device to perform pulse measurement; or
a user info domain field in the first information frame comprises an application identifier field and a trigger-dependent user info field, and the trigger-dependent user info field comprises indication information indicating the second device to perform pulse measurement.
12. The method according to claim 11 , wherein the indication information indicating the second device to perform pulse measurement comprises one or more of the following parameters of the target pulse signal: a pulse repetition frequency, a duration length, a waveform, a coding scheme, and occupied bandwidth.
13. The method according to claim 12 , wherein the pulse repetition frequency of the target pulse signal is indicated by using a bitmap.
14. The method according to claim 13 , wherein the second device is one of a plurality of devices that assist the first device in performing pulse measurement on the target object, and wherein:
the first device simultaneously triggers the plurality of devices to perform pulse measurement on the target object by using one first information frame; or
the first device triggers different devices in the plurality of devices to perform pulse measurement on the target object by using different first information frames.
15. An object locating method, comprising:
receiving, by a second device, a first information frame from a first device for a first time and a second time;
assisting, by a second device, a first device in performing pulse measurement on a target object, wherein the pulse measurement is performed on the target object by using a first type of pulse signal and a second type of pulse signal, and pulse repetition frequencies of the first type of pulse signal and the second type of pulse signal are different, and wherein the assisting comprises:
after receiving, by the second device, a first information frame from the first device for a first time, sending, by the second device, the first type of pulse signal; and
after receiving, by the second device, the first information frame from the first device for a second time, sending, by the second device, the second type of pulse signal.
16. The method according to claim 15 , wherein the pulse repetition frequencies of the two types of pulse signals are prime numbers of each other.
17. The method according to claim 16 , wherein the pulse measurement is performed in a fine timing measurement (FTM) process of the first device and the second device.
18. The method according to claim 17 ,
wherein the first information frame triggers the second device to perform pulse measurement on the target object by using a target pulse signal, and the target pulse signal is one or two of the two types of pulse signals.
19. The method according to claim 15 , wherein:
a trigger-dependent common info field in the first information frame comprises indication information indicating the second device to perform pulse measurement; or
a user info domain field in the first information frame comprises an application identifier field and a trigger-dependent user info field, and the trigger-dependent user info field comprises indication information indicating the second device to perform pulse measurement.
20. The method according to claim 19 , wherein the indication information indicating the second device to perform pulse measurement comprises one or more of the following parameters of the target pulse signal: a pulse repetition frequency, a duration length, a waveform, a coding scheme, and occupied bandwidth.