Navigation receiver with coupled signal-tracking channels
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01S-005/02
G01S-001/08
G01C-021/00
출원번호
US-0880135
(1992-05-07)
발명자
/ 주소
Sennott James W. (418 N. Linden St. Bloomington IL 61701) Senffner David (1104 N. Orange St. Peoria IL 61606)
인용정보
피인용 횟수 :
198인용 특허 :
0
초록▼
The navigation receiver with coupled-tracking channels is intended for use in radio navigation systems based on trilateration wherein the times of arrival of radio signals transmitted by a plurality of ground- or space-based terminals are measured by a user terminal and utilized by the user terminal
The navigation receiver with coupled-tracking channels is intended for use in radio navigation systems based on trilateration wherein the times of arrival of radio signals transmitted by a plurality of ground- or space-based terminals are measured by a user terminal and utilized by the user terminal in calculating its position and orientation. The coupled-tracking navigation receiver periodically measures carrier phase, carrier frequency, modulation phase, and carrier amplitude for all of the signals arriving at the receiving ports of the receiver and periodically estimates the present values of carrier phase, carrier frequency, and modulation phase for all of the received signals, the estimating process utilizing for each parameter estimate the parameter measurements for a plurality of the received signals properly combined in a statistically appropriate manner by taking into account the relative geometry of the line-of-sight paths, receiver clock time dynamics, and dynamics and motion constraints of the receiver platform, thereby obtaining better performance under poor signal reception conditions and more accurate estimates of carrier phase, carrier frequency, and modulation phase for each of the received signals than independent measurements alone could provide. It follows that these more accurate estimates of the basic signal parameters lead to more accurate estimates of platform position and attitude and the rates of change of these quantities.
대표청구항▼
A navigation receiver for use on platforms or vehicles of a variety of types, some types of said platforms being equipped with platform velocity sensors that provide velocity inputs to said receiver, said velocity sensors being characterized by a velocity bias parameter, some types of said platforms
A navigation receiver for use on platforms or vehicles of a variety of types, some types of said platforms being equipped with platform velocity sensors that provide velocity inputs to said receiver, said velocity sensors being characterized by a velocity bias parameter, some types of said platforms being equipped with attitude reference systems that provide inputs to said receiver of heading in some cases, heading and elevation in other cases, and heading, elevation, and yaw in still other cases, all of said attitude data being referenced to an earth-fixed coordinate system, said platforms being characterized by platform dynamics characterization data comprising platform velocity random process correlation time, platform rotation rate random process correlation time, platform velocity random process state noise disturbance power, and platform rotation rate random process state noise disturbance power, said receiver being capable of receiving a plurality of signals, said signals being transmitted by a plurality of spatially-distributed transmitters with known positions and velocities and being propagated to said receiver over a plurality of line-of-sight paths, said transmitted signals being modulated sinusoidal carriers, said transmitted signals being particular functions of time, said time being maintained in synchronized transmitter clocks, said transmitted signals being received through at least one of a plurality of spatially-distributed receiver ports, said received signals being characterized by signal parameters comprising carrier phase, carrier frequency, modulation phase, modulation phase rate-of-change, and carrier amplitude, said receiver having a clock, said receiver clock being maintained in synchronism with said transmitter clocks, said navigation receiver comprising: a means for periodically measuring the correlations of each of said plurality of received signals with a plurality of reference signals, said measured correlations having noise components characterized by a correlation measurement noise covariance matrix; and a means for periodically estimating the values of a plurality of said signal parameters for each of said plurality of received signals, said estimating means utilizing said correlation measurements for a plurality of said received signals in obtaining said estimated signal parameter values for each of said received signals thereby obtaining more reliable estimates of said signal parameter values for each of said received signals than could be obtained by direct measurements of said signal parameters for each of said received signals or by estimates of said signal parameters based only on information derived from the received signal to which each pertains.
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