ERDI LDR25K1 1064nm Laser Target Designator with 25mJ Output for Precision Target Marking

Technical Specifications

Control Functions

• Respond to ranging commands; stop upon stop command;
• Output one set of range data and status per pulse during ranging;
• Range gate function for ranging;
• Auto‑stop continuous ranging after 5 min (1 Hz) or 1 min (5 Hz) if no stop command is received;
• Configure designation mode and code;
• Respond to designation command per configured mode/code; stop upon stop command;
• Auto‑stop after one designation cycle if no stop command is received;
• Output distance and status per pulse during designation;
• Power‑on and periodic self‑test with status output;
• Respond to self‑test command with status output;
• Report cumulative number of emitted laser pulses.

OUTLINE DIMENSION

≤ 68 mm × 52 mm × 90 mm

PIN INTERFACE

Communication interface: one TTL-level serial port.
Connector model and interface definition: see Table 1.

Socket: MOLEX 53048-0810
Mating Plug: MOLEX 51021-0800

Table 1 — Electrical Interface Definition (TTL)

Product Description

LDR25K1 25 mJ 1064 nm Laser Rangefinder / Target Designator Module

The LDR25K1 1064nm laser target designator module integrates coded laser designation and laser ranging in a single compact unit to provide target illumination for terminally guided weapons and long-range EO/IR sights. With a 25 mJ pulse energy level and tight beam quality, it is well suited for UAV payloads, light vehicle turrets and portable designator systems where size, weight and power must be kept under control.

The module supports full control from a host computer: start and stop ranging, start and stop laser illumination, set range gate, select automatic or fixed receiver gain, configure coding mode, read distance and pulse count, and query system status. It can respond to external commands in real time and reports both range data and status bytes after each measurement or designation burst, simplifying health monitoring and system integration.

In ranging mode, the LDR25K1 operates at 1 Hz or 5 Hz, plus single-shot measurement. Continuous ranging can last for 5 minutes at 1 Hz or 1 minute at 5 Hz before a short rest is required. The minimum range is ≤ 120 m and the maximum range is ≥ 5,200 m on vehicle-size diffuse targets, with range accuracy of ±2 m and an acquisition rate of at least 98%. First-target or last-target logic can be selected to adapt to cluttered backgrounds or partially obscured scenes.

In designation mode, the module provides an effective laser illumination distance ≥ 2 km and uses precise frequency coding to match weapon-system requirements. The basic designation frequency is 20 Hz, coding accuracy is better than 2.5 μs, and eight pre-stored period codes are available; user-defined code expansion is also supported. Illumination time within one cycle is adjustable from 1 to 25 s, with up to eight continuous cycles and at least 30 s off-time between cycles to protect the laser head.

Mechanically, the LDR25K1 fits within an estimated 68 mm × 52 mm × 90 mm envelope and weighs no more than 380 g, which is ideal for stabilized gimbals, compact pods and handheld systems. Power is supplied from a 20–28 V DC bus, with an average operating power consumption of ≤ 50 W and peak power ≤ 100 W.

The electrical interface uses a single TTL-level serial port with a MOLEX 53048-0810 board connector and 51021-0800 mating plug. The pinout provides +24 V and return lines plus TTL_TX and TTL_RX for host communication. The asynchronous serial protocol follows RS-422/TTL conventions at 115200 bps, 8 data bits, 1 start bit, 1 stop bit and no parity, with least significant byte sent first. Commands select operating mode, ranging frequency, gain mode and coding mode, while status bytes report distance validity, ranging/designation state, external sync flag, temperature status and other diagnostics.

Environmentally, the LDR25K1 is designed for high-reliability operation in demanding conditions. The working temperature range is −40 °C to +60 °C and the storage range is −55 °C to +70 °C, matching typical airborne and ground-platform requirements. The housing is sealed and dust-proof; internal high-voltage areas are protected, and the front optical window must be kept clear during use to avoid damaging the photodetector. These characteristics, combined with ERDI’s experience in 1064 nm designator modules, make the LDR25K1 a strong choice for lightweight laser guidance and mid-range targeting applications.