In the deep mountains and old forests, forest rangers rely on the combined equipment of Dingjian Beidou short message + RTK + DMR intercom + Tiantong satellite phone to achieve a communication and life-saving system of "never losing contact". The synergy of each technology covers the needs of all scenarios such as positioning, communication, and emergency response. The specific advantages and applications are as follows：

1. Beidou short message: The "lifeline of wireless communications"”

Core advantages: Without the need for ground base stations, Beidou satellites enable nationwide short message communication without blind spots, supporting the transmission of text, location coordinates, and environmental data (such as temperature, humidity, and air pressure), and data encryption ensures security.

Application scenarios：

Daily patrol: Forest rangers can send patrol points, forest vegetation status, abnormal conditions (such as accumulation of dead wood, suspected fire) and other information to the command center through short messages. For example, when an unextinguished bonfire is found in a coniferous forest belt with an altitude of more than 1,000 meters, precise coordinates (such as N30°XX′XX″, E119°XX′XX″) can be quickly reported, along with a description of the scene.

Fire warning: When a fire occurs, short messages can transmit fire location, scale and environmental data in real time, and the command center can formulate fire-fighting routes and evacuation plans accordingly. For example, in the landslide incident in Shaoguan, Guangdong, Tiantong satellite phones were linked with Beidou short messages to deliver information about the disaster area as soon as possible.

Multiple network switching: At the edge of forest areas or near villages, the device automatically switches to the 2G/3G/4G network, supporting voice calls and high-definition photo/video transmission, achieving full scene coverage of "no network contact, but network scheduling".

2. RTK (real-time dynamic differential positioning): Centimeter-level precise navigation

Core advantages: Through satellite carrier phase difference technology, centimeter-level positioning accuracy is achieved (horizontal accuracy is 6 meters, elevation accuracy is 8 meters), and supports three-dimensional coordinate acquisition, sample plot setting, ancient tree positioning and micro-topography measurement.

Application scenarios：

Resource survey: In forest areas with canopy density ≤ 0.6, RTK can efficiently complete the investigation of forest stand density and tree distribution pattern, with a positioning error of only 0.143 meters per tree, meeting the needs of precise forestry.

topographic survey: Combined with ArcGIS software, micro-terrain information such as slope and aspect can be simultaneously obtained to assist fire spread analysis and fire isolation zone planning.

Anti-interference design: Through "quasi-dynamic measurement" technology (such as Hi-Tech RTK post-processing engine), "flying spots" are reduced in forest-obstructed environments, improving positioning stability and ensuring operational efficiency.

3. DMR intercom: The “instant bond” of team collaboration”

Core advantages: Digital transmission technology improves voice clarity, supports multi-user same-channel communication, and has strong anti-interference capabilities. It is equipped with 4W transmit power, 40mm speakers and professional audio chips to adapt to noisy environments.

Application scenarios：

internal collaboration: When the forest ranger team patrols separately, they can communicate in real time through the DMR intercom about route blocking, suspected fire points, etc., to avoid repeated inspections and improve collaboration efficiency. For example, in a dense broad-leaved forest belt, if the front team members find that the road is blocked, they can immediately notify the rear team members to adjust the route.

Cross-team linkage: When the fire is severe, the command center allocates fire-fighting areas through DMR, and each team reports on the progress to achieve scientific allocation of resources.

environmental adaptation: The equipment is explosion-proof, waterproof, and dustproof, and can adapt to extreme environments such as high temperature, high humidity, and severe cold in forest areas to ensure reliable communications all day long.

4. Tiantong satellite phone: "Basic means of emergency communications"”

Core advantages: Independently developed in China, it covers China, surrounding sea areas and Southeast Asia. It supports voice, text messages, data communications and Beidou/GPS positioning. It has strong disaster resistance, portable equipment and long standby time.

Application scenarios：

extreme emergency: When earthquakes, floods, typhoons, etc. cause ground communications to be paralyzed, Tiantong satellite phones become a "lifeline."

remote coverage: In areas such as deep mountains, deserts, and oceans without base station coverage, it supports voice calls, location sharing, and disaster photo/video transmission to ensure that the command center can grasp the on-site situation in real time.

strategic reserve: As an important part of the national emergency communications system, it ensures national security and public safety and avoids reliance on third-party communications services.

Synergy and Comprehensive Advantages

Full scene coverage: From short message communication and RTK precise positioning for daily patrols, to real-time DMR collaboration in emergencies and guaranteed communication by Tiantong satellite phones, a full-process guarantee of "monitoring-early warning-dispatch-rescue" is formed.

Disaster resilience: The equipment all has IP68 protection level, resisting rain, sand and dust, extreme temperatures (-40°C~+80°C), and adapting to the complex environment of forest areas.

management practices: Grassroots emergency units ensure standardized management of equipment maintenance, usage training, and fault repair reporting through systems such as "three specialties" (specialized projects, dedicated personnel, and dedicated personnel) and "one machine, one gear" to improve emergency response efficiency.

This equipment combination uses Beidou short message network-free communication, RTK's centimeter-level positioning, DMR's real-time team collaboration, and Tiantong satellite phone's emergency guarantee to build a "communication life-saving system" for rangers in deep mountains and old forests, ensuring their safe and efficient operations in complex environments.

Dingjian focuses on the R&D, production and sales of three-proof communication products such as single Beidou handheld terminals, Beidou short message terminals, RTK high-precision positioning terminals, single Beidou explosion-proof intercom terminals, explosion-proof mobile phones, anti-confidential mobile phones, 5G single Beidou law enforcement recorders, satellite communication phones, etc. It supports customized Hongmeng systems, secondary development, and provides one-stop communication equipment application solutions.