RF CHIRP SIGNAL PROPAGATION DELAY MEASUREMENT
First Claim
Patent Images
1. A method of estimating a distance between two radio frequency devices, comprising:
- transmitting a plurality of spread spectrum chirp signals frequency offset from one another from a first radio frequency device;
receiving the plurality of spread spectrum chirp signals in a second radio frequency device;
evaluating the received plurality of spread spectrum chirp signals for relative phase shifts between the plurality of spread spectrum chirp signals; and
deriving a fine propagation time between the first and second devices using the phase shifts between the spread spectrum chirp signals.
4 Assignments
0 Petitions
Accused Products
Abstract
Distance between two radio frequency devices is estimated by receiving a plurality of spread spectrum chirp signals frequency offset from one another, and evaluating the received plurality of spread spectrum chirp signals for relative phase shifts between the plurality of spread spectrum chirp signals. A fine propagation time is derived using the phase shifts between the spread spectrum chirp signals. A frequency domain despreading window is shifted to reduce the influence of time-delayed near multipath signals in receiving the plurality of spread spectrum chirp signals.
-
Citations
14 Claims
-
1. A method of estimating a distance between two radio frequency devices, comprising:
-
transmitting a plurality of spread spectrum chirp signals frequency offset from one another from a first radio frequency device; receiving the plurality of spread spectrum chirp signals in a second radio frequency device; evaluating the received plurality of spread spectrum chirp signals for relative phase shifts between the plurality of spread spectrum chirp signals; and deriving a fine propagation time between the first and second devices using the phase shifts between the spread spectrum chirp signals. - View Dependent Claims (2, 3)
-
-
4. A radio frequency ranging system, comprising:
-
a first device operable to transmit a plurality of spread spectrum chirp signals frequency offset from one another; a second device operable to receive the plurality of spread spectrum chirp signals, the second device further operable to evaluate the received plurality of spread spectrum chirp signals for relative phase shifts between the plurality of spread spectrum chirp signals and derive a fine propagation time between the first and second devices using the phase shifts between the spread spectrum chirp signals. - View Dependent Claims (5, 6)
-
-
7. A method of estimating a distance between two radio frequency devices, comprising:
-
receiving a plurality of spread spectrum chirp signals transmitted from a transmitting radio frequency device frequency offset from one another; evaluating the received plurality of spread spectrum chirp signals for relative phase shifts between the plurality of spread spectrum chirp signals; and deriving a fine propagation time between the first and second devices using the phase shifts between the spread spectrum chirp signals. - View Dependent Claims (8, 9)
-
-
10. A radio frequency device, comprising:
-
a radio frequency receiver operable to receive a plurality of spread spectrum chirp signals frequency offset from one another transmitted from a transmitting radio device; and processing logic operable to evaluate the received plurality of spread spectrum chirp signals for relative phase shifts between the plurality of spread spectrum chirp signals and derive a fine propagation time between the first and second devices using the phase shifts between the spread spectrum chirp signals. - View Dependent Claims (11, 12)
-
-
13. A method of estimating a distance between two radio frequency devices, comprising:
transmitting a plurality of spread spectrum chirp signals frequency offset from one another from a first radio frequency device, the plurality of spread spectrum chirp signals transmitted with a known phase relationship between signals.
-
14. A radio frequency device, comprising:
a transmitter operable to transmit a plurality of spread spectrum chirp signals frequency offset from one another, the plurality of spread spectrum chirp signals transmitted with a known phase relationship between signals
Specification