Measuring Angle of Incidence in an Ultrawideband Communication System
First Claim
1. A method in an RF system comprising first and second RF receivers separated by a predetermined distance, d, and an RF transmitter, the method comprising the steps of:
- [1] in the first and second receivers, synchronizing the first and second receivers to a predetermined time base;
[2] in the transmitter, transmitting an RF signal having a predetermined carrier wavelength, A;
[3] in the first receiver, receiving the transmitted signal and developing a first phase value as a function of the complex baseband impulse response of said received signal;
[4] in the second receiver, receiving the transmitted signal and developing a second phase value as a function of the complex baseband impulse response of said received signal;
[5] developing a phase difference value, a, as a function of the first and second phase values; and
[6] developing an angle of arrival, θ
, of the transmitted signal relative to the first receiver according to the following;
1 Assignment
0 Petitions
Accused Products
Abstract
In an ultra-wideband (“UWB”) receiver, a received UWB signal is periodically digitized as a series of ternary samples. During a carrier acquisition mode of operation, the samples are continuously correlated with a predetermined preamble sequence to develop a correlation value. When the value exceeds a predetermined threshold, indicating that the preamble sequence is being received, estimates of the channel impulse response (“CIR”) are developed. When a start-of-frame delimiter (“SFD”) is detected, the best CIR estimate is provided to a channel matched filter (“CMF”). During a data recovery mode of operation, the CMF filters channel-injected noise from the sample stream. Both carrier phase errors and data timing errors are continuously detected and corrected during both the carrier acquisition and data recovery modes of operation. The phase of the carrier can be determined by accumulating the correlator output before it is rotated by the carrier correction. By comparing the carrier phases of two receivers separated by a known distance, d, the angle of incidence, θ, of the signal can be determined.
21 Citations
8 Claims
-
1. A method in an RF system comprising first and second RF receivers separated by a predetermined distance, d, and an RF transmitter, the method comprising the steps of:
-
[1] in the first and second receivers, synchronizing the first and second receivers to a predetermined time base; [2] in the transmitter, transmitting an RF signal having a predetermined carrier wavelength, A; [3] in the first receiver, receiving the transmitted signal and developing a first phase value as a function of the complex baseband impulse response of said received signal; [4] in the second receiver, receiving the transmitted signal and developing a second phase value as a function of the complex baseband impulse response of said received signal; [5] developing a phase difference value, a, as a function of the first and second phase values; and [6] developing an angle of arrival, θ
, of the transmitted signal relative to the first receiver according to the following; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification