Patent ID: 11942948
Assignee: TOPCON POSITIONING SYSTEMS, INC.
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 0:
1. An apparatus for forming pseudo-random wideband signals comprising:
(a) a set of channels each comprising a numerically controlled oscillator (NCO) having a controlled frequency and phase and a PRN code generator, the NCO configured to generate a strobe that is output to the PRN code generator, and the PRN code generator configured to form a new sequence element of +1 or −1 in response to the strobe;
(b) a first modulator comprising:
(1) a plurality of weight coefficients;
(2) a plurality of multipliers each configured to multiply one of the plurality of weight coefficients by the output of the PRN code generator;
(3) an adder configured to output a sum of the plurality of multipliers output signals; and
(4) a mixer with a quadrature output signal configured to multiply the adder's output by sine and cosine of a low intermediate frequency (low-IF);

(c) a processor configured to control the set of channels;
(d) a transceiver module configured to receive and/or transmit quadrature signals, the transceiver comprising an RF front-end and an antenna; and
(e) an interface configured to connect an output of the mixer and the transceiver module,
wherein the transceiver module is configured to transmit the quadrature signal output from the mixer converted to a radio frequency, or to add the quadrature signal to a quadrature signal received from the antenna and converted to a zero or a near-zero frequency, or replace the quadrature signal received from the antenna and converted to the zero or the near-zero frequency signal.