RSSI AND ULTRASONIC BASED HYBRID RANGING TECHNOLOGY
First Claim
1. A hybrid ranging method comprising the steps of:
- transmitting from a first node an ultrasonic signal and a radio signal comprising at least one radio synchronization signal with a predetermined ratio therebetween;
calculating, at a second node, a ultrasonic transmission time period between the receipt of the radio synchronization signal and the receipt of the ultrasonic signal;
calculating, at the second node, an ultrasonic measured result between the first node and the second node by using the ultrasonic transmission time period;
calculating, at the second node, the strength of the received radio signal, and obtaining a radio measured result between the first node and the second node from a reference database;
calculating, at the second node, the smoothness of the ultrasonic measured result and the radio measured result; and
determining, at the second node, a final measured result according to the smoothness of the ultrasonic measured result and the radio measured result.
2 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a hybrid ranging method comprising the steps of: transmitting from a first node an ultrasonic signal and a radio signal comprising at least one radio synchronization signal with a predetermined ratio; calculating, at a second node, a ultrasonic transmission time period between the receipt of the radio synchronization signal and the receipt of the ultrasonic signal; calculating, at the second node, an ultrasonic measured result between the first node and the second node by using the ultrasonic transmission time period; calculating, at the second node, the strength of the received radio signal, and obtaining a radio measured result between the first node and the second node from a reference database; calculating, at the second node, the smoothness of the ultrasonic measured result and the radio measured result; and determining at the second node, a final measured result according to the smoothness of the ultrasonic measured result and the radio measured result.
-
Citations
15 Claims
-
1. A hybrid ranging method comprising the steps of:
-
transmitting from a first node an ultrasonic signal and a radio signal comprising at least one radio synchronization signal with a predetermined ratio therebetween; calculating, at a second node, a ultrasonic transmission time period between the receipt of the radio synchronization signal and the receipt of the ultrasonic signal; calculating, at the second node, an ultrasonic measured result between the first node and the second node by using the ultrasonic transmission time period; calculating, at the second node, the strength of the received radio signal, and obtaining a radio measured result between the first node and the second node from a reference database; calculating, at the second node, the smoothness of the ultrasonic measured result and the radio measured result; and determining, at the second node, a final measured result according to the smoothness of the ultrasonic measured result and the radio measured result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method for creating reference database, comprising the steps of:
-
transmitting radio synchronization signals and ultrasonic signal from a first node simultaneously; calculating, at a second node, a ultrasonic transmission time period between the receipt of the radio synchronization signal and the receipt of the ultrasonic signal; calculating, at the second node, an ultrasonic measured result between the first node and the second node by using the ultrasonic transmission time period; calculating, at the second node, the strength of the received radio signal; storing the ultrasonic measured result and the strength of the radio signal into the memory correspondingly; and repeatedly performing the above steps for other nodes to establish the reference database. - View Dependent Claims (14, 15)
-
Specification