DESCRIPTION OF THE PRIOR ART Nowadays, a wide scope of laser rangers of different designation and design exists. To measure the distance to the objects and to provide space selection, pulse laser rangers are used, for instance, one of them is described in the book by V. V. Molebniy"Systems for optical detection and ranging", edited in Moscow by Mashinostroenie in 1981, page 52. It comprises the pulse laser with an optical collimating system, emitting short optical pulses at the object ; from its output the start reference pulse is branched off to the reference photo receiver with pulse amplification, which is connected with the start pulse of the time-interval counter (TIC). The optical signal, reflected from the object through the optical receiving objective, gets into the photo receiver and it is amplified by the pulse amplifier and it is forwarded to the stop input of TIC. Distance to the object is defined by the measured time interval.

The drawback of this laser ranger is an impossibility to select an object by the distance and by the field of view, e. g. , if there are several targets in the field of view or there is a point object or an extended object, it is impossible to carry out object selection by the angle or reflective characteristics.

Partly the pulse ranger settles this problem (just the same literature, page 55, fig. 2.6), that is the prior art of the invention.

This ranger comprises the pulse laser (for instance, semiconductor quantum-mechanical oscillator [SQMO] with the scheme of pumping), the optical system making the emission diagram, the reference photo receiver, the receiving photo receiver with the receiving optical system, TIC; all the above-mentioned are set in a clock pulse-oscillator, key schemes, the counter, the memory unit 1, the memory unit 2, the reader and the indicator, the scheme"or", the reversible counter.

The information about distance up to each object is stored in the memory unit of this ranger; the memory unit is a source of information about an object required, being brought out by the reader.

The most actual task now is development of compact laser rangers- detectors for hidden surveillance of the applied optical observation means (for example, spy-glasses, periscopes, binoculars, cameras etc. ). Upon that, it is necessary to provide selection of this class of objects at the background of parasitical objects (walls, houses, buildings, wood, grass etc. ) by the characteristics of reflection (quasi-cat's eye objects at the background of the diffusive objects), as well as by the angle characteristics (point objects at the background of extended objects).

BRIEF DESCRIPTION OF THE DRAWINGS Other advantages and features of the present invention will now be described in greater detail with reference to an exemplary embodiment, which is intended to explain and not to limit the invention, and is illustrated in the drawing, that is FIGURE 1 shows the optical scheme of the submitted laser ranger with the higher level of selectivity of the objects being measured; FIGURE 2 shows the epures of signals and the principle of the ranger's operation; FIGURE 3 shows the application of two emitting channels with the noncoincided emission diagrams DESCRIPTION OF THE PREFERRED EMBODIMENT The laser ranger comprises: - the first SQMO pulse laser with the optical collimating lens (6), - the second SQMO pulse laser with the optical collimating lens (7), - the 2-channel linked amplifier (1) of SQMO pumping, - the controlled oscillator (2) of SQMO pulse pumping, - the synchronizer (4), - the first (12), the second (13) and the third (3) integrators, - the avalanche photodiode [AP] (22) with the optical receiving lens (8), - the controlled AP feed regulator (5), - the first comparator (11) and the second comparator (10), - the adder (16), - the controlled counter (14), - the time-interval counter (15), - the voice synthesizer (17), - the inhibit pulse shaper (19), - the indicator (18) for objects detection.

The laser ranger-detector operates as follows. The controlled oscillator (2) makes a sequence of short pulses Tim-100 nsec with a repetition frequency Fr-100 Hz-1 kHz (it is suitable for space observation); pulses start in turn SQMO 1 laser (20) and SQMO 2 laser (21) through the linked power amplifier (1). The SQMO emission gets at the objects through the collimating lens (6) and the collimating lens (7). A signal reflected from the object gets at the receiving lens (8), then at the AP photo receiver (22); the photodetected signal is amplified by the amplifier (9) and finally it is brought to the comparators (10) and (11). The first comparator (11) develops an information signal upon overcome of detection threshold, which is formed by three branches. The second comparator (10) develops the control signals, proportional to the noise level of receiving channel.

Vnoise-Pbackground + VAPpower + Vnoise/amplif VnoiseT°C Where: Pbackground is the level of the background noise.

VAPpower is the level of noise of the AP power regulator.

Ynoise/ampiifis the level of noise of the amplifier.

Noise'C is the temperature noise.

A number of noise pulses after the second comparator (10) is transformed in integrators (12), (13) into control signals with a different constant of time. A slowly changing signal VCOntr2 (with 12) is brought to the controllable feed regulator (5), that regulates an AP amplification coefficient, due to this the noise level's constancy (of the detection threshold) is provided within the wide range of exploitation conditions (Pbackground # 0~10-5 W, T°C = -40°~50°C).

The first signal Vcontri (when Ti « 1 : 2) is speed-response and it is brought through the adder (16) simultaneously with Vcontr2 at the reference input of the first comparator (11). At the same moment, the third signal Vcontr3 from the third integrator (3) with 13-Tnearestzone iS brought to the adder (16) (where Tnearestzone = 1-2 m sec is the zone of short range detection # 50 ~ 300 m).

Vcontr3 is the adaptive signal, considering correction of the detection threshold, depending on the signal's changes within the distance. It is required for suppression of signals from the diffusive objects and for signals development from optical systems.

Three control branches applied settle the following tasks: Vcontr2 : it settles the task of adaptation of the detection threshold for the factors slowly changing-temperature and slow changes of the background (day, night, clouds etc.) Vcontrl : it settles the task of adaptation of the detection threshold for the factors quickly changing [difference of background: light/dark, building, shadow, parasitical sources of light in the field of view upon quick space scanning by the ranger].

Vcontr3 : it settles the task of adaptation of the detection threshold, depending on the distance up to the object in order to decrease amplitude-time error in distance measuring and space-time amplitude selection of the useful objects (optical systems) from the parasitical objects (diffusive-reflective).

Optical systems give the reflected signal (glare), according to the signal's level [Popt. refl is the level of the reflected signal from the optical systems; Pdif is the level of the reflected signal from the diffusive objects], that is much more bigger, than diffusive objects do, where: 6dif. 120°-180°- (2-3) rad #opt. # 1° ~ 5° # (0, 017 0, 1) rad In practice it is allowed to use the regulation law: <BR> <BR> <BR> <BR> <BR> <BR> t<BR> Vcontr(t) # Vo # e Owing to these technical solutions, the noise immunity, selectivity of detection and measurement of objects'parameters increase.

Application of the voice synthesizer (17) enables to receive the information about distance without the interruption of operator from search & observation process, it increases reliability and efficiency of the information's search & record. Application of the separate indicator (18) for the object detection gives possibility to fix quickly position of the field of view of the ranger at the object.

Also to increase the secretiveness and to decrease the average capacity of the laser ranger emission in order to decrease the threshold of detection, using the night viewing devices, the double mode of pumping of the semiconductor quantum-mechanical oscillator [SQMO] is applied. The first mode is the increased repetition frequency F-kHz upon objects search, the second mode is the rarely repeating mode upon getting at an object Frizz Hz.

These modes create the conditions of the failure in detection of the laser ranger, it enables to hidden detect the observers with day and night optical devices for observation.

The application of two emitting channels with the noncoincided emission diagrams (see FIG. 3) enables to provide the selection of the useful point objects (optical systems), relatively the extended objects (walls reflecting diffusively etc. , glasses in buildings, road signs and so on), using the criteria of the angle and linear dimensions.

For example, the optical devices have the reflective aperture of ~20. 50 mm, but the walls, the glasses, the light-reflecting road signs are of much more bigger dimensions. That is why the extended objects, we have two signals from the extended objects from the first SQMO and from the second SQMO. Upon that, the signal of prohibition to supply information is generated into the pulse sharper (19), according to the counter's (14) signal. If there is a signal from the first SQMO, the prohibition is absent.