Abstract: The invention relates to a method and an apparatus for angle measurement or for the determination of an angle of position for an object. The method comprises the use of a beacon having a known position and rotating around its axis, which emits light or reflects light focused thereon. The light emitting from the beacon being determined either previously or for the start of each measurement for a given reference bearing. In the method, the light emitted from the beacon is picked up by a receiver present in an object to be measured, which is provided with elements for determining, by means of the light received from the beacon, the rotational speed of the beacon and further an angular position for the object with respect to said reference bearing.

Abstract: A distance measuring apparatus has a sensor, a monitor region selection portion, a distance measuring portion, and a detection portion. The sensor photoelectrically converts the subject image to output a subject image signal corresponding to the luminance distribution. The monitor region setting portion sets the monitor region at the time of integration of the above sensor. The distance measuring calculation portion calculates the distance measurement with respect to the region including the monitor region set with the monitor region setting portion. The detection portion detects a region low in luminance and low in contrast based on the above subject image signal. The monitor region setting portion sets as the second monitor region the low luminance and low contrast region detected with the detection portion out of the first monitor region set at the first time.

Abstract: A geodetic instrument is disclosed which is set up over a ground point by a tripod and whose telescope is swivelable about a tilt axis and a rotational axis and which is outfitted with a laser arrangement for centering the rotational axis over the ground point and for determining the height h of the intersection point of the tilt axis and rotational axis over the ground point. In an instrument of the type mentioned above, a first, preferably collimated, laser beam extending in the rotational axis and at least one further laser beam path which extends divergent to the first laser beam are provided and, together, enclose an angle &ggr;, and wherein there is further provided a measuring device for determining the distance a between the two laser beam paths at the height of the ground point and an evaluating device for calculating the height h of the intersection point over the ground point from the relationship h˜a.

Abstract: An angle compensation method compensates for the angle of the light-receiving surface of a photodiode disposed in an inclination detection device. The light-receiving surface is divided into four parts by an a-axis and a b-axis disposed perpendicular to each other and receives light reflected from an object surface that is an X-Y plane. The inclination detection device seeks the inclination of the object surface from changes in the irradiation position of the light reflected onto the photodiode light-receiving surface.

Abstract: A system and method for selecting at least one target with strong reflectivity from a set of strong and weak reflectors by using an amplitude of a reflected signal to make such a selection. The pre-computed look-up table that relates an amplitude of the reflected signal from a target with a strong reflectivity to the distance at which such target is located is used in a real-time mode to separate weak reflectors from strong reflectors. In the post-processing mode the usage of normalizing function allows to further differentiate between strong reflectors (like windows) and very strong reflectors (like prisms).

Abstract: A police radar detector detects police radar signals in the X, K and wide Ka police radar bands and rejects interfering Ka band signals that are a higher harmonic of a nuisance source having a fundamental frequency adjacent to the X police radar bands. Each of the three police radar bands is separately swept in a first mixer stage with the resulting IF signal concurrently demodulated in two IF circuits. The first IF circuit detects signals that were received in the X, K and outer portions of the wide Ka band during respective sweeps. The second IF circuit detects nuisance signals adjacent to the X and K bands, and the inner portion of the wide Ka band during respective sweeps.

Abstract: A portable type distance measuring apparatus which comprises an apparatus main body 11 having a distance measuring unit for measuring a distance by projecting a distance measuring light 30, a control unit for controlling the distance measuring unit and for processing measurement data from the distance measuring unit and a transmitting unit to emit a communication light including the measurement data to a distance measuring direction, and a target unit having a display unit 13, an operation unit 14 and a photodetection unit 15 for receiving the communication light, wherein the target unit is removably mounted on the apparatus main body so that the target unit may be used as an object to be measured for distance measurement when necessary.