  Recent spectroscopic observations by sensitive radio telescopes require
accurate molecular spectral line frequencies to identify molecular species in a
forest of lines detected. To measure rest frequencies of molecular spectral
lines in the laboratory, an emission-type millimeter and submillimeter-wave
spectrometer utilizing state-of-the-art radio-astronomical technologies is
developed. The spectrometer is equipped with a 200 cm glass cylinder cell, a
two sideband (2SB) Superconductor-Insulator-Superconductor (SIS) receiver in
the 230 GHz band, and wide-band auto-correlation digital spectrometers. By
using the four 2.5 GHz digital spectrometers, a total instantaneous bandwidth
of the 2SB SIS receiver of 8 GHz can be covered with a frequency resolution of
88.5 kHz. Spectroscopic measurements of CH$_3$CN and HDO are carried out in the
230 GHz band so as to examine frequency accuracy, stability, sensitivity, as
well as intensity calibration accuracy of our system. As for the result of
CH$_3$CN, we confirm that the frequency accuracy for lines detected with
sufficient signal to noise ratio is better than 1 kHz, when the high resolution
spectrometer having a channel resolution of 17.7 kHz is used. In addition, we
demonstrate the capability of this system by spectral scan measurement of
CH$_3$OH from 216 GHz to 264 GHz. We assign 242 transitions of CH$_3$OH, 51
transitions of $^{13}$CH$_3$OH, and 21 unidentified emission lines for 295
detected lines. Consequently, our spectrometer demonstrates sufficient
sensitivity, spectral resolution, and frequency accuracy for in-situ
experimental-based rest frequency measurements of spectral lines on various
molecular species.
